CN105585226A

CN105585226A - AAONAO continuous flow two-sludge denitrification advanced nitrogen removal and dephosphorization device and technology based on online control

Info

Publication number: CN105585226A
Application number: CN201610125677.7A
Authority: CN
Inventors: 张唯; 段昌群; 和树庄; 陆轶峰
Original assignee: Yunnan University YNU
Current assignee: Yunnan University YNU
Priority date: 2016-03-04
Filing date: 2016-03-04
Publication date: 2016-05-18
Anticipated expiration: 2036-03-04
Also published as: CN105585226B

Abstract

The invention relates to an AAONAO continuous flow two-sludge denitrification advanced nitrogen removal and dephosphorization device and technology based on online control. The device mainly comprises an anaerobic pond, a first-stage anoxic pond, a first-stage quick aeration tank, a first-stage sedimentation tank, an aeration biological filter, a second-stage anoxic pond, a second-stage quick aeration tank, a second sedimentation tank, a redox potential measuring control system, a dissolved oxygen measuring control system and an aeration subsystem. The device is based on a double-sludge denitrification nitrogen removal and dephosphorization principle and the oneline control technology, anaerobic phosphorus release, secondary sedimentation of sludge, secondary denitrification phosphorus uptake, secondary aerobiotic phosphorus uptake, secondary denitrification nitrogen removal, control of low-oxygen low-ammonia nitrogen nitrification liquor, backflow denitrification of sludge mixed liquid and other nitrogen removal and dephosphorization technologies are optimized and combined, when the carbon-nitrogen ratio of inflow water is 6.5-14, the carbon-phosphorus ratio is larger than 50, under the condition that no extra organic carbon sources are added, advanced nitrogen removal and dephosphorization of domestic wastewater are stably achieved, and the quality of outflow water can meet the requirement of surface water of the fourth grade or above.

Description

A kind of AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus and technique based on On-line Control

Technical field

The invention belongs to technical field of sewage, relate to advanced nitrogen dephosphorization purifying device and the work of one way of life sewageSkill, is suitable for Sewage Plant grassroot project, be specifically related to a kind of based on on-line monitoring and control under, according to denitrification nitrogen and phosphorus removalPrinciple, carries out device and the technique thereof of secondary denitrification nitrogen and phosphorus removal.

Background technology

At present, China's " urban wastewater treatment firm pollutant emission standard " first grade discharging category-A standard is total to sewage effluentsThe concentration up to standard of nitrogen is defined as 15mg/L, and the concentration up to standard of total phosphorus is 0.6mg/L, far above China's " surface water environment quality markAccurate " total nitrogen 2mg/L that V class standard specify, the value of total phosphorus 0.4mg/L, if be directly discharged into ground the water after Sewage Plant purificationIn table water, will cause serious nitrogen phosphorus eutrophication pollution. In fact, most of sewage treatment plants reality of current ChinaThrough having become new pollution sources, the sewage of a large amount of so-called " up to standard " discharge causes urban environment and periphery secondary pollution of water, seriousAffect the people's production and life, the advanced nitrogen Dephosphorization New Technique of sewage and the research of new technology are extremely urgent.

Traditional sewage denitrification and dephosphorization generally need to be through nitrated, denitrification, release phosphorus and inhale the biochemical processes such as phosphorus, and experience is detestedThe completely different and conflicting environmental condition such as oxygen, aerobic, anoxic, often final because nitrated stage in early stage almost runs outOrganic matter of sewage, the denitrification stage lacks enough organic carbon sources, and is difficult to realize stable and nitrogen phosphorus clean-up effect efficiently.Therefore, in sewage disposal process, the efficient utilization of organic carbon source is existing most of sewage treatment plants of China sewage disposal works alwaysThe difficult problem that skill need to solve. Improve the utilize pattern of sewage treatment process to organic carbon source, introduce new denitrogenation dephosphorizing approach, profitExisting technique is improved by advanced On-line Control technology, and researched and developed the denitrification dephosphorization technique of new applicable high accuracy controlEmphasis and the focus of research from now on will be become.

Denitrification nitrogen and phosphorus removal technique is utilized the organic carbon source in sewage fully, by two kinds of microorganisms of nitrification and denitrificationSeparately cultivate at suitable environment. By continuous enrichment DPAOs under anaerobic/anoxic alternation condition, under anaerobic utilize formerThe synthetic internal carbon source PHA of VFAs in water, and taking nitrate, the PHA in electron acceptor oxidation Decomposition body completed under anoxia conditionAmount is inhaled phosphorus reaction. Denitrogenation and dephosphorization can synchronously be removed, solved employing conventional method domestic sewage denitrifying is removedThe problem of phosphorus carbon source deficiency, has the features such as efficient, low energy consumption, sludge output be low, is at present more concerned, very promisingA kind of Advance in New Technology of Biological Nutrient Removal.

Denitrifying phosphorus removal technique is mainly divided into two large classes: a class is single sludge system, represents that technique is single mud SBR and changesEnter technique, aerobic particle mud technique and UCT and improve technique (BCFS); Another kind of is two sludge systems, represent technique be A2N andDephanox technique.

Existing continuous flow double sludge denitrification denitrification dephosphorization technique is all to only have one-level denitrification pond, owing to surmounting mudThe a large amount of ammonia nitrogens that carry, the general ammonia nitrogen concentration of water outlet is higher, and total nitrogen clean-up effect is undesirable, can not realize advanced nitrogen dephosphorization.In addition, because reactor end aeration is nitrate anion by part mineralized nitrogen, enter into after second pond meeting when sludge settlingThere is part denitrification, produce nitrogen, affect the settling property of mud, water outlet often can suspend on a small quantity can not sedimentation mud leadCause the purification efficiency that finally has influence on phosphorus and CODcr. Its three, the mud that second pond refluxes generally can be entrained with and mostly is nitrateNitrogen, is back to anaerobic pond and will consumes organic matter, hinders anaerobic phosphorus release, and then denitrification and dephosphorization are below produced to unfavorable shadowRing. Therefore, how overcoming the deficiencies in the prior art is problems that current technical field of sewage is needed solution badly.

Summary of the invention

The present invention is directed to the denitrification nitrogen and phosphorus removal techniques such as existing A2N and Dephanox and cannot realize advanced nitrogen dephosphorization,The unsettled problem of effluent quality, provides a kind of AAONAO continuous flow double sludge denitrification advanced nitrogen based on On-line Control to removePhosphorus device and technique, this device and technological basis double sludge denitrification denitrogenation dephosphorizing principle, based on On-line Control technology, by anaerobismRelease the aerobic suction phosphorus of secondary settlement, secondary denitrifying phosphorus uptake, secondary, secondary denitrification denitrogenation, the low Ammonia Nitrification of hypoxemia of phosphorus, mudThe denitrification dephosphorization techniques such as the control of liquid and mud mixed liquid backflow denitrification are optimized combination, have realized the advanced nitrogen of sewageThe effect of dephosphorization.

The technical solution used in the present invention is as follows:

A kind of AAONAO(based on On-line Control is anaerobic-anoxic-oxic-nitrifying-anoxic-oxic)Continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus, comprises anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, one-levelSettling tank, BAF, secondary anoxic pond, the quick aeration tank of secondary, secondary settling tank, oxidation reduction potential determination controlSystem, aeration subsystem, DO determination control system, PLC and computer;

Anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level are connected by pipeline successively with first grade subsides pond, aeration and biological filterPond, secondary anoxic pond, the quick aeration tank of secondary are connected by pipeline successively with secondary settling tank, the supernatant water outlet of first grade subsides pondHold and be connected by pipeline BAF top water inlet end;

The bottom mud discharging mouth in first grade subsides pond surmounts pump by mud and is connected with the water inlet end of secondary anoxic pond;

The water inlet end phase of pump and secondary anoxic pond is also returned in the water side of the described quick aeration tank of secondary by mud mixed liquidConnect;

The water inlet of pump and one-level anoxic pond is also returned in the water side of described BAF below by aeration tank nitrification liquidEnd is connected;

The water inlet end of anaerobic pond is provided with intake pump;

In the described quick aeration tank of one-level anoxic pond, one-level, secondary anoxic pond and the quick aeration tank of secondary, being equipped with diving stirsMix device, make the even mixing of mud and water;

The top of secondary settling tank is provided with drainpipe; The bottom mud discharging mouth of secondary settling tank returns to pump and anaerobic pond by mudWater inlet end is connected; The bottom mud discharging mouth of secondary settling tank is also connected with sludge pump;

In described first grade subsides pond and secondary settling tank, be equipped with mud scraper;

Described oxidation reduction potential determination control system comprises 4 on-line oxidation reduction potential determining instruments and 2 cover aerationSystem, every oxidation reduction potential determination instrument comprises oxidation-reduction electrode and the on-line oxidation reduction potential meter of electrical connection; 4 coversThe oxidation-reduction electrode of oxidation reduction potential determination instrument is located at respectively the water side of anaerobic pond, the water outlet of the quick aeration tank of one-levelEnd, the water side of secondary anoxic pond and the water side of the quick aeration tank of secondary; Online in 4 cover oxidation reduction potential determination instrumentsThe oxidation-reduction electrode electrical connection that oxidation-reduction potentiometer one end is corresponding with it, the other end is electrically connected with PLC;

Described DO determination control system comprises 1 online DO determination instrument and 1 cover aeration subsystem, describedLine DO determination instrument comprises dissolved oxygen electrode and the online dissolved oxygen instrument of electrical connection, and described dissolved oxygen electrode is located at aerationBetween the water inlet end of the water side of biofilter and secondary anoxic pond in pipeline, the output of dissolved oxygen electrode and online dissolved oxygen instrumentEnd electrical connection, the input of described online dissolved oxygen instrument is electrically connected with PLC;

Described every cover aeration subsystem comprises connected successively aeration head, gas flowmeter, aeration pump and frequency converter, aeration pumpBe connected with the power output end of frequency converter; The power input of the frequency converter in 3 cover aeration subsystems is all electrically connected with PLC;The aeration head belonging in the aeration subsystem of oxidation reduction potential determination control system is located at respectively the quick aeration tank of one-level and twoLevel is bottom, aeration tank fast, and the aeration head belonging in the aeration subsystem of DO determination control system is located at BAFBottom;

Described PLC is connected with computer.

Described anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, BAF, secondary anoxic pond and secondaryAeration tank all needs the sealing state that keeps certain fast, avoids outside air to enter as far as possible;

Described anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, BAF, secondary anoxic pond and secondary are quickAeration tank all seals, one-level anoxic pond, the quick aeration tank of one-level, BAF, secondary anoxic pond and the quick aeration of secondaryThe top in pond is equipped with the blast pipe with air bleeding valve; The air chamber of anaerobic pond and one-level anoxic pond is connected; Specifically refer to:

Described anaerobic pond and one-level anoxic pond top is airtight, and air chamber is connected, the air bleeding valve by one-level anoxic pond top toOuter exhaust;

Top, the quick aeration tank of described one-level is airtight, by the outside exhaust of air bleeding valve of top, the quick aeration tank of one-level;

Described BAF top is airtight, by the outside exhaust of air bleeding valve of BAF top;

Described secondary anoxic pond top is airtight, by the outside exhaust of air bleeding valve of secondary anoxic pond top;

Top, the quick aeration tank of described secondary is airtight, by the outside exhaust of air bleeding valve of top, the quick aeration tank of secondary.

Further, preferably described anaerobic pond is to be in series by multiple ponds.

Further, preferably described secondary anoxic pond is to be in series by multiple ponds.

Further, preferably described anaerobic pond is that two ponds are in series, and one-level anoxic pond is single pond, and one-level is quickWei Dan pond, aeration tank, secondary anoxic pond is two pond series connection, Wei Dan pond, the quick aeration tank of secondary. The quantity in each unit process pondUnder the condition that ensures basic function, can suitably increase and decrease.

Further, preferably between described PLC and on-line oxidation reduction potential meter, between PLC and frequency converter,Between PLC and online dissolved oxygen instrument and being electrically connected between PLC and computer all adopt 485 to be connected by communication.

Further, preferably BAF top is cylinder type, and the cone angle that bottom is same diameter is falling of 60 degreeTaper shape, the joint of circular cone and cylinder is horizontally disposed with stainless steel sift orifice plate, and mesh size is 5mm, loads filler shape on sieve trayBecome packing layer, packing material size is 0.6-1.5cm; Directly over packing layer, be provided with water distributor, the entering of water distributor and BAFWater end (W.E.) is connected, and water distributor is used for ensureing uniform water inlet, and the water level of BAF is generally a little more than packing layer; Aeration is rawAeration head in thing filter tank is arranged on sieve tray top, and the distance of aeration head and sieve tray is 1/3 of packing layer thickness;

Wherein, described filler is that the filler of volcanic rock or the easy apposition growth of other microorganisms is as volcanic rock, haydite, quartz sandOr zeolite etc. The main apposition growth of filling surface the biomembrane taking nitrifier as dominant bacteria, and this biomembrane can turn ammonia nitrogenTurn to nitrite nitrogen and nitrate nitrogen. When water is when dirty, the aeration head top of BAF is because aeration aeratingEffect has just formed aeration nitrification zone, and aeration head below is because formed deoxidation nitrification zone without aeration. Therefore, control aerationThe dissolved oxygen of biofilter water outlet, a less concentration range, just can be realized the completely nitrated of ammonia nitrogen, reaches aerationThe best nitrification liquid water yielding condition of biofilter hypoxemia and low ammonia nitrogen concentration. This deoxidation nitrification liquid can be to denitrification belowReaction produces inhibitory action.

Further, preferably entering of pond also discharged by draining pump and cleaning in the water side of described BAFMouth end is connected, and the top in cleaning discharge pond is returned to pump by supernatant and is connected with the water inlet end of BAF; Clean dischargeThe bottom mud discharging mouth in pond returns to pump by clean sludge and is connected with the water inlet end of one-level anoxic pond; Wherein, BAFBetween water side and draining pump, supernatant returns between pump and BAF and cleans discharge pond and clean sludge is returnedBetween pump, be equipped with magnetic valve; Draining pump, supernatant return pump, clean sludge return pump and magnetic valve all with PLC output phaseConnect.

General BAF operation about 20 days, due to the biofilm detachment adhering on packing layer with on a small quantity from one-levelSettling tank flows into the accumulation of activated sludge of BAF, easily causes that biofilter stops up and cause the release of phosphorus, shouldBAF is cleaned. The method of cleaning: BAF adopts downwards emptying side rapidly by draining pumpMethod, is washed into the filler coming off in BAF and activated sludge in cleaning discharge pond, and carries out quiescent settling, will sinkSupernatant after falling returns to pump with supernatant and returns in BAF. Mud (biomembrane coming off and/or the dirt of sedimentationMud, is rich in nitrobacteria) return to pump by clean sludge and can return to one-level anoxic pond, be that the activated sludge in reaction tank supplements nitreChange bacterium. In BAF cleaning process, all relevant pumps and magnetic valve are controlled by PLC, and can pass through computer endProgram interface realize manual control.

Further, preferably the top of described BAF by pipeline with not for BAF providesThe inlet end of the aeration pump of the other two cover aeration subsystems of gas is connected. By the used oxygen concentration in BAF topLower air is as the gas source of the quick aeration tank of one-level and the quick aeration tank of secondary aeration pump. The quick aeration tank of one-level andNitrogen is discharged by this low-oxygen aeration mode in the quick aeration tank of secondary, improves one-level, secondary settling tank sludge settling property, withTime promote the effect of aerobic suction phosphorus by aeration, the secondary of avoiding excessive anaerobism to produce phosphorus discharges, the oxidative nitration of strengthening to ammonia nitrogen,Reduce ammonia nitrogen concentration. In the time of the carbon-nitrogen ratio lower (4.5-6.5) of water inlet, the quick aeration tank of one-level and the quick aeration tank of secondary are all mainConsider the stripping function of nitrogen, adopt the mode of this low-oxygen aeration. When water inlet carbon-nitrogen ratio very high (6.5-14) time, andIn the time that the quick aeration tank of secondary aeration rate is larger, the gas source of quick secondary aeration tank aeration pump directly can be switched to oxygenThe normal natural air of gas content.

The present invention also provides a kind of continuous flow double sludge denitrification denitrification dephosphorization technique, adopts above-mentioned based on On-line ControlAAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus, concrete steps are:

Sewage enters anaerobic pond through intake pump, and mud is returned after pump enters anaerobic pond and mixed with sewage by mud, in anaerobismUnder condition, discharge phosphorus, anaerobic pond end arranges oxidation-reduction electrode in order to monitoring and controls normally carrying out of phosphorus release;

After anaerobic reaction finishes, mud mixed liquid flows into one-level anoxic pond, with the aeration tank of passing through of flowing out from BAFNitrification liquid returns to the nitrification liquid that pump returns to be mixed, and carries out for the first time denitrification denitrogenation and inhales phosphorus reaction;

After anti-nitration reaction denitrogenation for the first time and suction phosphorus finish, mud mixed liquid flows into the quick aeration tank of one-level, carries out aerobic suctionThe nitration reaction of phosphorus, nitrogen stripping and ammonia nitrogen, by the redox electricity of installing in the quick aeration tank of one-level and secondary anoxic pondThe measurement result of the utmost point is controlled the aeration rate of the quick aeration tank of one-level, to make the oxygen of the quick aeration tank of one-level and secondary anoxic pondChanging reduction potential control range meets the requirements;

Afterwards, the mud mixed liquid flowing out from the quick aeration tank of one-level flows into first grade subsides pond, and the sedimentation separation of first grade subsides pond goes outThe supernatant coming flows into BAF, carries out nitration reaction, obtains nitrification liquid; The water outlet of dissolved oxygen electrode on-line monitoring is dissolvedThe variation of oxygen, and the nitrification liquid dissolved oxygen concentration flowing out from BAF by control aeration control is at 0.5-Between 1.0mg/L,, just can ensure that ammonia nitrogen is almost all degraded, realize the nitrification liquid water yielding condition of the low ammonia nitrogen concentration of hypoxemia;

A nitrification liquid part is returned to pump with aeration tank nitrification liquid and is turned back to one-level anoxic pond and carry out anti-nitration reaction, another part nitreChange liquid and flow into secondary anoxic pond; The mud of first grade subsides pond sedimentation surmounts pump through mud and is delivered in secondary anoxic pond, with aerationThe nitrification liquid that biofilter flows into and flow out from the quick aeration tank of secondary return to by mud mixed liquid the mud that pump returnsMixed liquor mixes, and carries out anti-nitration reaction for the second time;

After anti-nitration reaction finishes for the second time, mud mixed liquid flows into the quick aeration tank of secondary from secondary anoxic pond and carries out aerobic suctionThe nitration reaction of phosphorus (phosphoric residue in mixed liquor is removed), nitrogen stripping and remaining ammonia nitrogen; At the end of the quick aeration tank of secondaryThe aeration rate of the oxidation-reduction electrode on-line monitoring that end arranges and the control quick aeration tank of secondary;

Finally, the mud mixed liquid part flowing out from the quick aeration tank of secondary is returned to pump by mud mixed liquid and is back to secondaryAnoxic pond is carried out denitrification, and a part flows directly into secondary settling tank and carries out sedimentation in addition, and the supernatant after sedimentation is as onlyChanging liquid discharges; Sedimentation rear section mud returns to pump by mud and turns back to anaerobic pond and start new circulation, a part of mud in additionQuantitatively be discharged to outside this device with sludge pump as excess sludge;

Wherein, mud mixed liquid is in each pond time of staying: anaerobic pond 1-2.5h, and one-level anoxic pond 0.5-1.5h, one-level is exposed to the sun fastGas pond 0.2-1h, secondary anoxic pond 1-2.5h, the quick aeration tank 0.5-1.5h of secondary;

First grade subsides pond supernatant is 1-5h in the BAF time of staying;

The gas-water ratio of BAF is: 10-40;

The sludge concentration of anaerobic pond, one-level anoxic pond and secondary anoxic pond is controlled in the scope of 2000mg/L ~ 5000mg/L;

When water inlet carbon-nitrogen ratio is 6.5-14, carbon-phosphorus ratio is greater than at 50 o'clock, and taking intake pump flow velocity as reference, this installs each flow rate pump ratioScope: intake pump 100%, aeration tank nitrification liquid returns to pump 200%-400%, and mud surmounts flow rate pump 40%-80%, mud mixed liquidReturn to flow rate pump 100%-200%, mud returns to flow rate pump 50%-150%;

When water inlet carbon-nitrogen ratio is 4.5-6.5, carbon-phosphorus ratio is greater than at 50 o'clock, and wherein, taking intake pump flow velocity as reference, this installs each pump streamSpeed proportion: intake pump 100%, aeration tank nitrification liquid returns to pump 100%-300%, and mud surmounts flow rate pump 40%-80%, mudMixed liquor returns to flow rate pump 0%, and mud returns to flow rate pump 50%-150%;

When water inlet carbon-nitrogen ratio is 6.5-14, carbon-phosphorus ratio is greater than at 50 o'clock, the each reaction tank redox of oxidation reduction potential control systemControl of Electric potentials scope: anaerobic pond <-300mv, quick aeration tank-250 of one-level ~-140mv, secondary anoxic pond-160 ~-100mv, twoLevel is aeration tank+50 ~+120mv fast;

When water inlet carbon-nitrogen ratio is 4.5-6.5, carbon-phosphorus ratio is greater than at 50 o'clock, the each reaction tank redox of oxidation reduction potential control systemControl of Electric potentials scope: anaerobic pond <-300mv, quick aeration tank-200 of one-level ~-120mv, secondary anoxic pond-150 ~-50mv, twoLevel is aeration tank 0 ~+90mv fast.

This device and technique dephosphorization are mainly to absorb after phosphorus by mud, complete by the mode of discharge excess sludge,In order to ensure phosphor-removing effect preferably, further, preferably the sludge retention time of described device is 10-17 days.

Whole device is taking PLC control as main, and administrative staff, by the operation of host computer procedure supervising device, work as sewage qualityIn comparatively stable situation, administrative staff are according to the situation of the water quality of sewage, carbon-nitrogen ratio and carbon-phosphorus ratio and the purification that will reachEffect, determines that best nitrification liquid reflux pump, mud mixed liquid reflux pump, mud return to the velocity ratio that pump and mud surmount pump,Further, by the situation of change of test Inlet and outlet water and each reaction tank titanium pigment, ammonia nitrogen and nitrate anion, determine and adjustment anaerobismThe concrete control range of pond, the quick aeration tank of one-level, secondary anoxic pond, the quick aeration tank of secondary oxidation-reduction potential. Work as sewageWhen water quality changes, PLC will regulate the control range of oxidation-reduction potential automatically according to actual conditions, makes device energy automaticallyAdapt to rapidly. When sewage quality changes greatly time, need administrative staff according to concrete ruuning situation the scope to controlled conditionAdjust.

The principle that PLC controls oxidation-reduction potential is that PLC is by reading anaerobic pond, the quick aeration tank of one-level and secondary anoxicThe value of the oxidation-reduction potential of pond and the quick aeration tank of secondary, according to the scope of controlling, by changing the power supply output of frequency converterFrequency, thus the aeration rate of change aeration pump is controlled the oxidation-reduction potential value in each reaction tank. PLC is by reading aerationThe value of the dissolved oxygen that the online dissolved oxygen instrument in biofilter monitors, according to the scope of controlling, by changing the output frequency of frequency converterRate, changes the aeration rate of aeration pump, controls the dissolved oxygen concentration of effluent of aeration biological filter, realizes hypoxemia and low ammonia nitrogen concentrationNitrification liquid. PLC is in real time by the value of each reaction tank oxidation-reduction potential, the value of BAF dissolved oxygen and the frequency of frequency converterRate feeds back to computer end program circle. Gas flowmeter, can be as this just for the situation of keeper's manual record aerationThe direct control parameter of device.

When water inlet carbon-nitrogen ratio is while being 6.5-14, realize thorough denitrification and remove not affecting one-level anoxic pond and secondary anoxic pondIn the situation of nitrogen, just allow and enter the ammonia nitrogen in the quick aerated reaction of secondary pond at the aeration intensity of guaranteeing the quick aeration tank of secondaryOn completely nitrated basis, device should be selected higher mud mixed liquid reflux pump velocity ratio and higher nitrification liquid reflux pumpVelocity ratio is to realize the Nitrogen/Phosphorus Removal of the degree of depth; The quick aeration tank of one-level should adopt oxygen concentration that BAF usedLow air carrys out aeration; For the quick aeration tank of secondary, should adopt without the fresh air of aeration and carry out aeration.

In the time that the carbon-nitrogen ratio of disposing of sewage is 4-6.5, and again not in the design under the condition of additional organic carbon source: mud mixesLiquid does not reflux, and dispenses mud mixed liquid and returns pump and pipeline; Select less nitrification liquid reflux pump velocity ratio, reduce one-level anoxicThe denitrification load in pond; The oxygen concentration that the aeration pump of the quick aeration tank of firsts and seconds all adopts BAF to use is lowerAir carry out aeration,

Determining of concrete oxidation reduction potential control scope:

1, this device is under normal operation, should be less than-300mv of anaerobic pond end oxidation-reduction potential. Higher than this current potentialThe factors such as value is generally less because of the carbon-nitrogen ratio of sewage, and the quick aeration tank of I and II aeration rate is too large cause denitrification to be subject toSuppress. At this moment a large amount of discharges of water outlet nitrate anion, part nitrate anion returns and enters into anaerobic pond with mud, the remaining nitric acid of anaerobic pondRoot, the release of phosphorus is suppressed, and whole device will worsen, and dephosphorization and denitrification effect all will decline rapidly. This situation, firstBy lowering the control range of oxidation-reduction potential of the quick aeration tank of I and II and secondary anoxic pond, secondly can lower mudThe measures such as the velocity ratio of the reflux pump of mixed liquor and nitrification liquid reflux pump carry out the normal operation of assurance device. If through repeatedly adjustingExamination still cannot obtain stable state of a control, and administrative staff should determine that whether the carbon-nitrogen ratio of sewage and carbon-phosphorus ratio are in the present inventionThe scope of introducing, and organic biodegradable in sewage.

2, in the time that water inlet carbon-nitrogen ratio is 6.5-14: the quick aeration tank of one-level will avoid excess aeration to cause organic carbon on the one handThe anti-nitration reaction of impact secondary anoxic pond below that source is not enough; On the other hand, also to avoid aeration deficiency to cause secondary anoxicThe secondary of pond denitrifying phosphorus uptake poor effect and generation phosphorus discharges, and finally causes the concentration of the quick aeration tank of secondary phosphorus too high,Dephosphorization overload of power, aerobic suction phosphorus cannot complete the situation of the deep purifying of phosphorus. In the time that influent quality is stablized, according to test in advanceThe quick aeration tank of one-level of setting and the control range of secondary anoxic pond oxidation-reduction potential are controlled; When change of water quality largerTime, PLC cannot realize oxidation-reduction potential to secondary anoxic pond according to the control range of the oxidation-reduction potential that setsControl, PLC will realize secondary anoxic pond oxidation-reduction potential by the control range of the quick aeration tank of automatic adjustment one-levelControl requirement.

3, when water inlet carbon-nitrogen ratio is while being 6.5-14, the concrete control range of the quick aeration tank of secondary oxidation-reduction potential beThe oxidation-reduction potential that ensures anaerobic pond, the quick aeration tank of one-level and secondary anoxic pond is stablized in controllable situation, in conjunction with going outThe orthophosphates of water and the concentration of ammonia nitrogen are come actual definite.

4, when water inlet carbon-nitrogen ratio is while being 6.5-14: (1), in the time that the concentration of this device water outlet phosphorus is higher, administrative staff can adjustThe control range of the oxidation-reduction potential of the quick aeration tank of high one-level, the quick aeration tank of secondary and secondary anoxic pond, utilizes secondaryFast the aerobic suction phosphorus in aeration tank and the denitrifying phosphorus uptake that promotes secondary anoxic pond are used for the clean-up effect of phosphorus of raising; (2) whenThe clean-up effect of water outlet phosphorus is very good, but when the clean-up effect of total nitrogen is not good, is generally because the quick aeration of one-levelThe quick aeration tank of pond and secondary aeration is excessive, causes secondary anoxic pond organic carbon source to lack, and denitrification is not thorough, causes water outletThe situation that nitrate nitrogen concentration is higher. At this moment can lower the quick aeration tank of one-level, secondary anoxic pond and the quick aeration tank of secondaryThe control range of oxidation-reduction potential.

5, in the time that the carbon-nitrogen ratio of disposing of sewage is 4-6.5, realize deep purifying effect, can be anti-in one-level or secondaryThe nitrated stage adopts additional organic carbon source to realize advanced nitrogen dephosphorization, the control of the sewage that its control method and carbon-nitrogen ratio are higherTerm harmonization, is not just described in detail.

6, when the carbon-nitrogen ratio of disposing of sewage is 4-6.5, and not when additional organic carbon source, in control, be first to avoid one-level anoxicPond denitrification is not thorough, and nitrate nitrogen enters first grade subsides pond denitrification generation nitrogen occurs, and affects the sedimentation of mud. Secondly,The quick aeration tank of one-level is for stripping nitrogen instead of aerobic suction phosphorus, better as long as the intensity of aeration can ensure that mud hasSettling property. Its three, secondary anoxic pond arranges suitable oxidation reduction potential control scope, makes secondary anoxic pond residualThe removal effect of a small amount of nitrate nitrogen (1-2mg/L) intensified anti-nitrated phosphorous-removal, avoids the secondary of phosphorus to discharge. Its four, secondary is fastSpeed aeration tank be first to meet stripping nitrogen, in the time that organic carbon source is comparatively sufficient, just passable when water outlet phosphorus content is higherStrengthen aeration rate and strengthen aerobic suction phosphorus and nitrification, therefore suitable oxidation-reduction potential control should be selected in the quick aeration tank of secondaryScope processed. Because secondary anoxic pond does not realize denitrification completely, the air that the quick aeration tank of secondary provides just meets strippingThe measures such as nitrogen, is not enough to be oxidized ammonia nitrogen, and mud mixed liquid does not reflux, the downward of nitrification liquid reflux ratio, therefore have part ammonia nitrogenRemain in water outlet, denitrification effect can decline to some extent, and phosphor-removing effect is because of the strengthening of denitrification dephosphorization effect, and its purification will can notBe affected.

First grade subsides pond and secondary settling tank are provided with mud scraper, mud scraper by reducing motor drive slowly run, rotating speed withNot stirring mud is advisable. Mud scraper can reduce the time of staying of mud, avoids mud excessively to accumulate and produce part at settling tankAnaerobism, the secondary of the phosphorus causing discharges, and can improve the sludge concentration of anaerobic pond, one-level anoxic pond and secondary anoxic pond simultaneously, addsFast denitrification rate. Mud scraper comprises the bracing frame of reducing motor, central shaft, cleaning shoe and support cleaning shoe, and cleaning shoe is edgeThe edge, tapered zone of settling tank makees the scraper plate around settling tank central rotation. The Main Function of mud scraper is by settling tank bottom taperThe mud at edge scrapes the central authorities of settling tank, and the mud of settling zone is carried out to suitable disturbance, fill up mud find time topCavity, the suction of accelerate sludge pump to mud. Mud scraper can significantly improve the mobility of mud, reduces to greatest extent mud and existsThe time of staying of settling tank, the concentration of raising anaerobic pond and anoxic pond mud.

Compared with prior art, its beneficial effect is in the present invention:

The startup stage of this device, make Denitrifying Phosphate Accumulating Organisms become quick aeration-bis-of anaerobic pond-anoxic pond-one-level by technique adjustmentThe dominant bacteria of activated sludge in the level quick aeration tank of anoxic-secondary, becomes in BAF on filler nitrobacteriaThe biomembranous dominant bacteria adhering to.

The present invention arranges oxidation-reduction electrode so that whole technique is regulated and controled at anaerobic pond end, realizes under anaerobic conditionThe release of phosphorus; Realize denitrification denitrogenation and step by step denitrifying phosphorus uptake mistake step by step by one-level anoxic pond and secondary anoxic pond unitJourney; The quick aeration tank of one-level and the quick aeration tank of secondary are set, and oxidation-reduction electrode is set, On-line Control aeration rate, realizesAerobic suction phosphorus and aerobic nitrification step by step, simultaneously can also stripping nitrogen, can avoid again excessive anaerobic environment after denitrificationCause the secondary of phosphorus to discharge;

Controlling frequency converter by PLC indirectly controls the aeration rate of aeration pump and realizes the oxidation-reduction potential prison to each reaction tankControl; Controlling frequency converter by PLC indirectly controls the aeration rate of aeration pump and realizes the prison to effluent of aeration biological filter dissolved oxygenControl, reaches the nitrification liquid water outlet of the low ammonia nitrogen of BAF and low DO concentration;

Compare the present invention of A2N technique and by one-level anoxic pond, the ammonia nitrogen of mud mixed liquid is directly diluted, then by sedimentationAfter concentrated, mud is pumped into secondary anoxic pond, the mud mixed liquid of the quick aeration tank of secondary is turned back in secondary anoxic pond simultaneouslyCarry out the dilution of ammonia nitrogen for the second time, greatly reduce the ammonia nitrogen concentration of the quick aeration tank of secondary and secondary settling tank water outlet ammonia nitrogenConcentration;

Apparatus of the present invention utilize On-line Control technology sewage in optimum controling range to experience denitrification denitrogenation twice, twice pair of ammoniaThe dilution of nitrogen, twice pair of ammonia nitrogen carries out oxidative nitration reaction, and the process such as the backflow anoxic pond denitrification of mud mixed liquid, finalProgressively realize advanced nitrogen; By anaerobic phosphorus release, twice denitrification dephosphorization, twice aerobic suction phosphorus, finally progressively realizes the degree of depth and removesPhosphorus; Solve the denitrification nitrogen and phosphorus removal such as A2N and Dephanox technique and cannot realize advanced nitrogen dephosphorization, effluent quality shakinessFixed problem;

Apparatus of the present invention, based on double sludge denitrification denitrogenation dephosphorizing principle, have been set up the anti-of anaerobic-anoxic-oxic-anaerobic-aerobicNitrifying activated sludge system and there are two mud that the biofilm system (being BAF) of aerobic nitrification function combinesSystem.

The present invention arranges without aeration deoxidation district in BAF bottom, and in water outlet place of aeration nitrification tank, dissolving is setOxygen electrode, the dissolved oxygen content of on-line monitoring nitrification liquid water outlet is controlled aeration rate, when guarantee ammonia nitrogen is completely nitrated, subtractsFew dissolved oxygen enter into firsts and seconds anoxic pond;

First grade subsides pond and secondary settling tank arrange mud scraper, reduce the time of staying of mud, avoid sludge accumulation to produce localAnaerobism, the secondary of the phosphorus causing discharges;

Apparatus of the present invention can be according to different sewage qualities and carbon-nitrogen ratio situation, by measuring each reaction tank solubility orthophosphoric acidThe change in concentration situation of salt, ammonia nitrogen, nitrate anion, determines the most stable control model of the best of each reaction tank oxidation-reduction potentialEnclose; Be 150mg/L to 1000mg/L when processing CODcr, carbon-nitrogen ratio is 6.5-14, carbon-phosphorus ratio > when 60 sanitary sewage, this deviceWater outlet total nitrogen, total phosphorus and CODcr many index can reach the above standard of surface water four class; When process CODcr be 150mg/L extremely1000mg/L, carbon-nitrogen ratio is 4-6.5, carbon-phosphorus ratio > when 50 sanitary sewage, this device is multinomial when processing water outlet total phosphorus and CODcrIndex can reach the above standard of surface water four class, and the total nitrogen index of water outlet approaches one-level surface water five class standards, and higher than one-level AMark level.

In the time that concentration of wastewater is lower, can correspondingly increase intake pump velocity ratio, correspondingly reduce nitrification liquid reflux pump streamSpeed ratio and mud mixed liquid reflux pump flow velocity recently improve the operational efficiency of this device.

Brief description of the drawings

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existingHave the accompanying drawing of required use in technical description to be briefly described, apparently, the accompanying drawing in the following describes is only thisSome embodiment of invention, for those of ordinary skill in the art, not paying under the prerequisite of creative work, also canTo obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the knot that the present invention is based on the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus of On-line ControlStructure schematic diagram;

Wherein, 1, intake pump; 2, mud recurrent canal; 3, the first anaerobic pond; 4, submersible agitator; 5, the second anaerobic pond; 6, oxidationReducing electrode; 7, on-line oxidation reduction potential meter; 8, with the blast pipe of air bleeding valve; 9, one-level anoxic pond; 10, one-level is exposed to the sun fastGas pond; 11, aeration head; 12, first grade subsides pond; 13, mud scraper; 14, sieve tray; 15, gas flowmeter; 16, aeration pump; 17,Frequency converter; 18, online dissolved oxygen instrument; 19, mud surmounts pump; 20, aeration tank nitrification liquid returns to pump; 21, clean sludge is returned to pump;22, magnetic valve; 23, BAF; 24, draining pump; 25, supernatant returns to pump; 26, dissolved oxygen electrode; 27, clean dischargePond; 28, the first secondary anoxic pond; 29, the second secondary anoxic pond; 30, the quick aeration tank of secondary; 31, mud mixed liquid returns to pump;32, mud returns to pump; 33, sludge pump; 34, secondary settling tank; 35, PLC; 36, computer; 37, drainpipe; 38, water distributor; 39,Packing layer. The direction of arrow in figure is the flow direction of sewage, mud, mud mixed liquid or gas.

Detailed description of the invention

Describe embodiments of the present invention below in detail, the example of described embodiment is shown in the drawings, wherein ad initioExtremely whole same or similar label represents same or similar element or has the element of identical or similar functions. Below by ginsengThe embodiment of examining accompanying drawing description is exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.

Those skilled in the art of the present technique are understandable that, the correlation module relating in the present invention and the function of realization thereofTo carry computer software programs conventional in prior art in device, device or the system of hardware after improvement and formation thereofOr relevant agreement just can realize, be not that computer software programs of the prior art or relevant agreement are improved. For example,Computer hardware system after improvement still can realize by loading existing operation system of software the spy of this hardware systemDetermine function. Therefore, be understandable that, innovation of the present invention is improvement and the company thereof to hardware module in prior artConnect syntagmatic, but not be only in hardware module for realizing the software that carries about function or the improvement of agreement.

Those skilled in the art of the present technique are understandable that, the correlation module of mentioning in the present invention is for carrying out the applicationDescribed in one or more hardware device in step in operation, method, flow process, measure, scheme. Described hardware device canThink required object and specialized designs and manufacture, or also can adopt known device in all-purpose computer or known itsHis hardware device. Described all-purpose computer has storage procedure Selection therein and activates or reconstruct.

Unless those skilled in the art of the present technique are appreciated that specially statement, singulative used herein " ", "Individual ", " described " and " being somebody's turn to do " also can comprise plural form. Should be further understood that, what in description of the present invention, use arrangesDiction " comprising " refers to and has described feature, integer, step, operation, element and/or assembly, exists or adds but do not get rid ofOne or more other features, integer, step, operation, element, assembly and/or their group. Should be appreciated that, when we claim unitWhen part is " connected " or " coupling " arrives another element, it can be directly connected or coupled to other elements, or also can existIntermediary element. In addition, " connection " used herein or " coupling " can comprise wireless connections or couple. Wording used herein"and/or" comprises arbitrary unit of listing item and all combinations that one or more is associated.

Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (comprise technology artLanguage and scientific terminology) have with the present invention under the identical meaning of the general understanding of those of ordinary skill in field. Also shouldUnderstand, such as those terms that define in general dictionary should be understood to have with the context of prior art in meaningThe meaning that justice is consistent, unless and definition as here, can not explain by idealized or too formal implication.

Those skilled in the art of the present technique are appreciated that unless otherwise defined, if annexation used herein does not have spyDifferent explanation, can realize function of the present invention, and with the present invention under the general understanding of those of ordinary skill in field identical.

Below in conjunction with embodiment, the present invention is described in further detail.

It will be understood to those of skill in the art that the following example is only for the present invention is described, and should not be considered as limiting thisBright scope. Unreceipted concrete technology or condition person in embodiment, according to the described technology of the document in this area or conditionOr carry out according to product description. Material therefor or the instrument unreceipted person of production firm, is and can obtains by purchaseConventional products.

As shown in Figure 1, a kind of AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control,Comprise anaerobic pond, one-level anoxic pond 9, the quick aeration tank 10 of one-level, first grade subsides pond 12, BAF 23, secondary anoxicPond, the quick aeration tank 30 of secondary and secondary settling tank 34, also comprise oxidation reduction potential determination control system, aeration subsystem,DO determination control system, PLC35 and computer 36;

Anaerobic pond is that two ponds are in series, and the first anaerobic pond 3 and the second anaerobic pond 5 are connected;

One-level anoxic pond 9 is single pond, 10Wei Dan pond, the quick aeration tank of one-level, 30Wei Dan pond, the quick aeration tank of secondary.

Secondary anoxic pond is two pond series connection, and the first secondary anoxic pond 28 and the second secondary anoxic pond 29 are connected;

The first anaerobic pond 3, the second anaerobic pond 5, one-level anoxic pond 9, the quick aeration tank 10 of one-level and first grade subsides pond 12 are logical successivelyPiping is connected, BAF 23, the first secondary anoxic pond 28, the second secondary anoxic pond 29, the quick aeration tank 30 of secondaryBe connected by pipeline successively with secondary settling tank 34,12 supernatant water sides, first grade subsides pond with BAF 23 topsWater inlet end is connected by pipeline;

The bottom mud discharging mouth in first grade subsides pond 12 surmounts pump 19 by mud and is connected with the water inlet end of the first secondary anoxic pond 28;

Pump 31 and the first secondary anoxic pond 28 are also returned to by mud mixed liquid in the water side of the quick aeration tank 30 of described secondaryWater inlet end be connected;

Pump 20 and one-level anoxic pond 9 are also returned to by aeration tank nitrification liquid in the water side of described BAF 23 belowsWater inlet end is connected;

The water inlet end of the first anaerobic pond 3 is provided with intake pump 1;

The described quick aeration tank 10 of the first anaerobic pond 3, the second anaerobic pond 5, one-level anoxic pond 9, one-level, the first secondary anoxic pond28, in the quick aeration tank 30 of the second secondary anoxic pond 29 and secondary, be equipped with submersible agitator 4;

For avoiding air to enter in a large number, affect reaction environment, the quick aeration tank 10 of described one-level anoxic pond 9, one-level, aeration lifeAll there is lid sealing thing filter tank 23, the second secondary anoxic pond 29 and 30 tops, the quick aeration tank of secondary, and are provided with air bleeding valveBlast pipe 8;

The top of secondary settling tank 34 is provided with drainpipe 37; The bottom mud discharging mouth of secondary settling tank 34 returns to pump by mud successively32 and mud recurrent canal 2 be connected with the water inlet end of the first anaerobic pond 3; The bottom mud discharging mouth of secondary settling tank 34 also with sludge pump33 are connected;

In described first grade subsides pond 12 and secondary settling tank 34, be equipped with mud scraper 13;

Described oxidation reduction potential determination control system comprises 4 on-line oxidation reduction potential determining instruments and 2 cover aerationSystem, oxidation-reduction electrode 6 and the on-line oxidation reduction potential meter 7 of every oxidation reduction potential determination instrument electrical connection; 4 cover oxygenChange reduction potential and measure oxidation-reduction electrode 6 together and be located at respectively the quick aeration tank 10 of water side, one-level of the second anaerobic pond 5Water side, the water side of the second secondary anoxic pond 29 and the water side of the quick aeration tank 30 of secondary; 4 cover oxidation-reduction potentials are surveyedOn-line oxidation reduction potential meter 7 one end oxidation-reduction electrode 6 corresponding with it in determining is together electrically connected, the other end and PLC35Electrical connection;

Described DO determination control system comprises 1 online DO determination instrument and 1 cover aeration subsystem, describedLine DO determination instrument comprises dissolved oxygen electrode 26 and the online dissolved oxygen instrument 18 of electrical connection, and described dissolved oxygen electrode 26 is establishedBetween the water side of BAF 23 and the water inlet end of the first secondary anoxic pond 28 in pipeline, dissolved oxygen electrode 26 withThe output electrical connection of line dissolved oxygen instrument 18, the input of described online dissolved oxygen instrument 18 is electrically connected with PLC35;

Described aeration subsystem always has 3 covers, and every cover aeration subsystem comprises connected successively aeration head 11, gas flowmeter15, aeration pump 16 and frequency converter 17, is connected by gas piping between aeration head 11, gas flowmeter 15 and aeration pump 16, exposes to the sunAir pump 16 is connected with the power output end of frequency converter 17; The power input of the frequency converter 17 in 3 cover aeration subsystems all withPLC35 electrical connection; The aeration head 11 wherein belonging in the aeration subsystem of oxidation reduction potential determination control system is located at respectivelyThe quick aeration tank 10 of one-level and 30 bottoms, the quick aeration tank of secondary, belong in the aeration subsystem of DO determination control systemAeration head 11 is located at BAF 23 bottoms;

Described PLC35 is connected with computer 36.

Described the first anaerobic pond 3, the second anaerobic pond 5, one-level anoxic pond 9, the quick aeration tank 10 of one-level, aeration and biological filterPond 23, the first secondary anoxic pond 28, the second secondary anoxic pond 29 and the quick aeration tank 30 of secondary all need the sealing shape that keeps certainState avoids outside air to enter as far as possible;

Due to for avoiding air to enter in a large number, affect reaction environment, described the first anaerobic pond 3, the second anaerobic pond 5, one-level lackOxygen pond 9, the quick aeration tank 10 of one-level, BAF 23, the first secondary anoxic pond 28, the second secondary anoxic pond 29 and secondaryAll there is lid sealing 30 tops, aeration tank fast, and the blast pipe 8 with air bleeding valve is installed;

So preferred version is that described the first anaerobic pond 3, the second anaerobic pond 5 are airtight with one-level anoxic pond 9 tops, the first anaerobismPond 3, the second anaerobic pond 5 are connected with one-level anoxic pond 9 air chambers, by the outside exhaust of the air bleeding valve in one-level anoxic pond 9;

10 tops, the quick aeration tank of described one-level are airtight, by the outside exhaust of air bleeding valve on the quick aeration tank 10 of one-level;

Described BAF 23 tops are airtight, by the outside exhaust of the air bleeding valve on BAF 23;

The first described secondary anoxic pond 28 and the second secondary anoxic pond 29 tops are airtight, the first secondary anoxic pond the 28 and the 22The air chamber of level anoxic pond 29 is connected, by the outside exhaust of the air bleeding valve in secondary anoxic pond 29;

30 tops, the quick aeration tank of described secondary are airtight, by the outside exhaust of air bleeding valve on the quick aeration tank 30 of secondary.

Water side, the second secondary that PLC35 reads the quick aeration tank 10 of water side, one-level of the second anaerobic pond 5 online lackThe redox electricity that the on-line oxidation reduction potential instrument 7 of the water side of the quick aeration tank 30 of the water side in oxygen pond 29 and secondary measuresPlace value, PLC35 controls the power supply output frequency of frequency converter 17 according to the control range of setting, and changes corresponding aeration pump 16Aeration rate, realizes the second anaerobic pond 5, the quick aeration tank 10 of one-level, the second secondary anoxic pond 29 and the quick aeration tank 30 of secondaryThe control of redox position. PLC35 adjusts the aeration rate of the quick aeration tank 10 of one-level can realize the quick aeration tank 10 of one-levelReach the control range of setting with the oxidation-reduction potential of the quick aeration tank 30 of secondary. PLC adjusts the quick aeration tank 30 of secondaryThe oxidation-reduction potential that aeration rate can be realized the second anaerobic pond 5 and the quick aeration tank 30 of secondary reaches the control range of setting.

PLC35 reads the dissolved oxygen concentration of BAF 23 water sides that online dissolved oxygen instrument 18 is measured to, according toThe dissolved oxygen control range that this device is set, the power supply output frequency of adjustment frequency converter 17, changes aeration in BAFThe aeration rate of pump 16, realizes the control to BAF 23 water outlet dissolved oxygens.

As present invention further optimization scheme, between PLC35 and on-line oxidation reduction potential meter 7, PLC35 and changeFrequently between device 17 and PLC35 all adopt 485 to be connected by communication with being electrically connected between dissolved oxygen instrument 18 online.

As present invention further optimization scheme, BAF 23 tops are cylinder type, and bottom is same diameterCone angle is the turbination of 60 degree, and the joint of circular cone and cylinder is horizontally disposed with stainless steel sift orifice plate 14, and mesh size is 5mm, sieveOn orifice plate 14, load filler and form packing layer 39, packing material size is 0.6-1.5cm; Directly over packing layer 39, be provided with water distributor 38,Water distributor 38 is connected with the water inlet end of BAF 23, and water distributor 38 is for ensureing uniform water inlet, and aeration and biological is filteredThe water level in pond 23 is generally a little more than packing layer 39; Aeration head 11 in BAF 23 is arranged on sieve tray 14 tops, exposes to the sunGas head 11 is 1/3 of packing layer 39 thickness with the distance of sieve tray 14;

Described filler is that the filler of volcanic rock or the easy apposition growth of other microorganisms is as volcanic rock, haydite, quartz sand or boilStone etc. Filling surface is mainly adhering to nitrifier, and when water is when dirty, aeration head 11 tops are because aeration aerating effect just formsAeration nitrification zone, aeration head 11 belows are because formed deoxidation nitrification zone without aeration.

As present invention further optimization scheme, the water side of BAF 23 is also by draining pump 24 and cleaningThe arrival end in discharge pond 27 is connected, and cleans the top in discharge pond 27 and returns to entering of pump 25 and BAF 23 by supernatantWater end (W.E.) is connected; The bottom mud discharging mouth that cleans discharge pond 27 returns to the water inlet of pump 21 and one-level anoxic pond 9 tops by clean sludgeEnd is connected; Wherein, between the water side of BAF 23 and draining pump 24, supernatant returns to pump 25 and BAFBetween 23 and cleaning discharge pond 27 and clean sludge are returned between pump 21 and are equipped with magnetic valve 22, for controlling its place pipelineSwitching.

Due to mud in packing layer 39 or the filler accumulation that comes off more, can cause the release of phosphorus, the filter of reply aeration and biologicalPond 23 is cleaned. The method of cleaning: BAF 23 adopts downwards emptying method rapidly by draining pump 24, will expose to the sunThe filler coming off in gas biofilter 23 is washed into and cleans in discharge pond 27, and carries out quiescent settling, by the supernatant after sedimentationReturning to pump 25 with supernatant returns in BAF 23. The mud of sedimentation returns to pump 21 by clean sludge can return to one-levelAnoxic pond 9 is the mud additional nitration bacterium in this device.

As present invention further optimization scheme, the top of BAF 23 is by pipeline and be not aeration and biologicalFilter tank 23 provides the aeration pump 16 of the other two cover aeration subsystems of gas to be connected. By used BAF 23 topsThe air that oxygen concentration is lower can be used as the aeration pump 16 of the quick aeration tank 10 of one-level and the quick aeration tank 30 of secondary by pipelineGas source, for secondary aeration. The quick aeration tank 30 of the quick aeration tank 10 of one-level and secondary is by this low-oxygen aeration sideFormula is discharged nitrogen, improves first grade subsides pond 12, secondary settling tank 34 sludge settling properties, promotes aerobic suction phosphorus by aeration simultaneouslyEffect, the secondary of avoiding excessive anaerobism to produce phosphorus discharges, and the oxidative nitration of strengthening to ammonia nitrogen, reduces ammonia nitrogen concentration. When what intakeWhen carbon-nitrogen ratio very high (6.5-14), or when the quick aeration tank of secondary 30 aeration rates are when larger, can be by quick one-level aerationThe gas source of the aeration pump 16 of the quick aeration tank 30 of the aeration pump in pond 10 and secondary directly switches to normal air.

A kind of continuous flow double sludge denitrification denitrification dephosphorization technique, adopts the above-mentioned AAONAO based on On-line Control continuousStream double sludge denitrification advanced nitrogen dephosphorization apparatus, concrete steps are:

Sewage enters the first anaerobic pond 3 and the second anaerobic pond 5 through intake pump 1, and mud returns to pump 32 by mud and enters the first anaerobismAfter pond 3 and the second anaerobic pond 5, fully mix under the effect of submersible agitator 4 with sewage, under anaerobic discharge phosphorus,The second anaerobic pond 5 ends arrange oxidation-reduction electrode 6 in order to monitor and to control the carrying out of whole reaction;

After anaerobic reaction finishes, mud mixed liquid flows into one-level anoxic pond 9 from the second anaerobic pond 5, and from BAF 23The aeration tank nitrification liquid that passes through flowing out returns to the nitrification liquid that pump 20 returns and fully mixes under the effect of submersible agitator 4,Carry out denitrification denitrogenation and suction phosphorus reaction for the first time;

After denitrification denitrogenation and suction phosphorus reaction finish for the first time, then mud mixed liquid flows into the quick aeration tank 10 of one-level, carries outThe nitration reaction of aerobic suction phosphorus, nitrogen stripping and ammonia nitrogen; The quick aeration tank 10 of one-level and the second secondary anoxic pond 29 end settingsOxidation-reduction electrode 6 and the corresponding on-line oxidation determination by reduction instrument 7 of configuration, PLC35 changes aeration pump 16 by frequency converter 17Aeration rate is controlled the oxidation-reduction potential of the quick aeration tank 10 of one-level and the second secondary anoxic pond 29 in the scope of setting, fromAnd make the denitrification denitrogenation of aerobic suction phosphorus, the first secondary anoxic pond 28 and the second secondary anoxic pond 29 of the quick aeration tank 10 of one-levelAnd denitrifying phosphorus uptake reaction is controlled at best state;

Afterwards, the mud mixed liquid flowing out from the quick aeration tank 10 of one-level flows into first grade subsides pond 12,12 sedimentations of first grade subsides pondThe supernatant of separating flows into BAF 23, carries out nitration reaction, obtains nitrification liquid; Dissolved oxygen electrode 26 is supervised onlineMeasure the variation of water dissolved oxygen, and the nitrification liquid dissolved oxygen flowing out by control aeration control is dense from BAF 23Degree, between 0.6-1.0mg/L, can ensure that ammonia nitrogen is almost all converted into nitrate anion and nitrite anions, avoids again too much simultaneouslyOxygen enter denitrification pond and affect anti-nitration reaction;

A nitrification liquid part is returned to pump 20 with aeration tank nitrification liquid and is turned back to one-level anoxic pond 9 and carry out anti-nitration reaction, another portionDivide nitrification liquid to flow in the first secondary anoxic pond 28; The mud of first grade subsides pond 12 sedimentations surmounts pump 19 through mud and is delivered to firstIn secondary anoxic pond 28, the nitrification liquid flowing into BAF 23 and passing through of flowing out from the quick aeration tank 30 of secondary are dirtyMud mixed liquor returns to the mud mixed liquid that pump 31 returns fully to be mixed under the effect of submersible agitator 4, at the first secondaryIn anoxic pond 28 and the second secondary anoxic pond 29, and carry out anti-nitration reaction for the second time; The mud of first grade subsides pond 12 sedimentations is logicalCross mud and surmount pump 19, surmounted BAF 23 and be directly delivered to the first secondary anoxic pond 28, do not pass through nitrated mistakeJourney, surmounts mud so cry. It is characterized in that: because surmounting mud does not pass through BAF, wherein carried a small amount of ammonia secretlyNitrogen has directly entered into secondary anoxic pond below, can affect the clean-up effect of apparatus of the present invention total nitrogen.

After anti-nitration reaction finishes for the second time, mud mixed liquid flows into the quick aeration tank of secondary from the second secondary anoxic pond 2930 fully carry out the nitration reaction of aerobic suction phosphorus, nitrogen stripping and remaining ammonia nitrogen under the effect of submersible agitator 4; At secondaryThe oxidation-reduction electrode 6 that the end of aeration tank 30 arranges fast and the corresponding on-line oxidation reduction potential analyzer 7 of configuration, pass throughOn-line monitoring and control the oxidation-reduction potential of the quick aeration tank 30 of secondary, to ensure that the purification of water outlet phosphorus and nitrogen reaches designStandard, does not affect the anaerobic phosphorus release of anaerobic pond and the redox control of one-level anoxic pond simultaneously.

Finally, the mud mixed liquid part flowing out from the quick aeration tank 30 of secondary is returned to pump 31 by mud mixed liquid and is returnedBe back to the first secondary anoxic pond 28 and carry out denitrification, a part flows directly into secondary settling tank 34 and carries out sedimentation, sedimentation in additionAfter supernatant discharge from drainpipe 37 as scavenging solution; Sedimentation rear section mud returns to pump 32 by mud and enters into mudIn recurrent canal 2, turn back to the first anaerobic pond 3 and start new circulation, a part of mud is fixed with sludge pump 33 as excess sludge in additionAmount is discharged to outside device;

Wherein, mud mixed liquid is in each pond time of staying: the first anaerobic pond and the second anaerobic pond have 1-2.5h altogether, one-level anoxic pond0.5-1.5h, the quick aeration tank 0.2-1h of one-level, the first secondary anoxic pond and the second secondary anoxic pond have 1-2.5h altogether, and secondary is fastSpeed aeration tank 0.5-1.5h;

First grade subsides pond supernatant is 1-5h in the BAF time of staying;

The gas-water ratio of BAF is: 10-40;

When water inlet carbon-nitrogen ratio is 6.5-14, carbon-phosphorus ratio is greater than at 50 o'clock, the each reaction tank redox of oxidation reduction potential control systemControl of Electric potentials scope: the second anaerobic pond <-300mv, quick aeration tank-250 of one-level ~-140mv, the second secondary anoxic pond-160 ~-100mv, quick aeration tank+50 of secondary ~+120mv;

When water inlet carbon-nitrogen ratio is 4.5-6.5, carbon-phosphorus ratio is greater than at 50 o'clock, the each reaction tank redox of oxidation reduction potential control systemControl of Electric potentials scope: the second anaerobic pond <-300mv, quick aeration tank-200 of one-level ~-120mv, the second secondary anoxic pond-150 ~-50mv, secondary quick aeration tank 0 ~+90mv.

Sludge retention time in this device is 10-17 days.

Application example 1

Apparatus of the present invention seed sludge is taken from Kunming sewage treatment plant, tames one week with campus life sewage, startsStage because BAF nitrobacteria less, nitrification ability a little less than, part ammonia nitrogen directly from this device outflow, activityThe denitrifying capacity of mud also relatively a little less than, a large amount of organic matters is not absorbed by activated sludge and denitrification utilizes, and directEnter into BAF, consume the oxygen of BAF, affect the oxidative nitration of ammonia nitrogen, therefore the domestication stage is logicalCross the aeration rate that strengthens BAF and could promote the growth and breeding of nitrobacteria in biofilter, impel ammonia nitrogen exposing to the sunGas biofilter completely nitrated. Like this after the enhanced aeration domestication about 10 days, the most of quilt of organic matter in sewageMud absorption and sorption and denitrification utilization, seldom traverse to BAF, and at this moment nitrification tank BAF is requiredAeration rate lower gradually, and ammonia nitrogen all can be oxidized to nitrate anion and nitrite anions, at this time this device is controlledThe dissolved oxygen concentration of nitrification liquid outlet just can ensure the completely nitrated of ammonia nitrogen a lower scope, ensures just denitrifyingOften carry out.

After the cultivations of 10 days and domestication, through commissioning test, determine the optimum controling range of each control parameter. When enteringThe fluctuation of water water quality carbon-nitrogen ratio is less, can under fixing control parameter, realize for a long time stable operation, realizes advanced nitrogen dephosphorization.If the variation of water quality and carbon-nitrogen ratio when larger, needs administrative staff to pass through that test is artificial determines best controlled condition.

BAF dissolved oxygen control range: in order to make ammonia nitrogen all be oxidized to nitrate anion and nitrite anions,Do not make more dissolved oxygen enter into one-level, secondary anoxic pond, disturb denitrification and consume organic matter simultaneously. Dissolved oxygen controlAt 0.6-0.8mg/L, at this moment the ammonia nitrogen concentration of effluent of aeration biological filter is all less than 0.2mg/L, has realized the complete nitre of ammonia nitrogenChange, ensure the clean-up effect of this device total nitrogen.

Wherein, taking intake pump flow velocity as reference, each flow rate pump proportion: intake pump 100%, aeration tank nitrification liquid returnsPump 300%, mud surmounts flow rate pump 55%, and mud mixed liquid returns to flow rate pump 200%, and mud returns to flow rate pump 100%;

This installs each reaction tank time of staying, and the first anaerobic pond and the second anaerobic pond have 1.5h altogether, one-level anoxic pond 1h, and one-level is fastSpeed aeration tank 0.3h, the first secondary anoxic pond and the second secondary anoxic pond have 2h altogether, the quick aeration tank 1h of secondary.

First grade subsides pond supernatant is 2h in the BAF time of staying. Each reaction tank oxidation reduction potential control modelEnclose: the second anaerobic pond <-350mv, quick aeration tank-200 of one-level--190mv, the second secondary anoxic pond-120--150mv, twoLevel is aeration tank+110-+120mv fast.

The time of staying of mud in this device was controlled at about 14 days, one-level anoxic pond, the first anaerobic pond, the second anaerobismThe sludge concentration of pond, the first secondary anoxic pond and the second secondary anoxic pond is controlled in the scope of 2500mg/L ~ 3000mg/L;

Through bimestrial normal operation continuously, when campus life sewage influent COD, cr is 351-826mg/L, and total nitrogen is 51-69mg/L, in the scope that carbon-nitrogen ratio is 6.9-12, when total phosphorus is 6.3-8.6mg/L scope, nitric efficiency is substantially all at 98-99%Between, dephosphorization efficiency by using is substantially between 96.9-98.2%, between the purification efficiency 92.5-94.6% of CODcr. TN goes out water concentrationOnly have between 0.65-0.9, wherein ammonia nitrogen is 0.1-0.25mg/L, and nitrate anion is between 0.3-0.6mg/L, and the water outlet of total phosphorus is denseDegree only has 0.1-0.28mg/L. Obviously the TN of water outlet reaches the above water quality of surface water 3 class, and ammonia nitrogen reaches surface water 2 class water quality, TPSubstantially reach the surface water above water quality of 4 class and CODcr and reach the above water quality of surface water one class, successfully realized campus life dirtThe target of one step deep purifying of water.

Application example 2

Apparatus of the present invention seed sludge is taken from Kunming sewage treatment plant, tames one week with manual simulation's sanitary sewage,Incipient stage because BAF nitrobacteria less, nitrification ability a little less than, part ammonia nitrogen directly from this device outflow,The denitrifying capacity of activated sludge also relatively a little less than, a large amount of organic matters is not by activated sludge absorption and sorption and denitrification profitWith, and directly enter into BAF, and consume the oxygen of BAF, affect the oxidative nitration of ammonia nitrogen. Therefore,The domestication stage could promote the growth and breeding of nitrobacteria in biofilter by the aeration rate that strengthens BAF, makes ammoniaNitrogen can be at biofilter exhaustive oxidation. Like this after the enhanced aeration domestication about 10 days, the aeration rate of BAFLower gradually, and ammonia nitrogen all can be oxidized to nitrate anion and nitrite anions, at this time this device control nitrification liquid goes outMouthful dissolved oxygen just can ensure the completely nitrated of ammonia nitrogen a lower scope, ensure denitrifyingly normally to carry out.

After the cultivations of 10 days and domestication, then through controlling the commissioning test of parameter, determine the best of each control parameterControl range, this device just can just can normally move.

BAF dissolved oxygen control range: in order to make ammonia nitrogen all be converted into nitrate anion and nitrite anions, simultaneouslyDo not make more dissolved oxygen enter into anoxic denitrifications at different levels pond, disturb denitrification and consume organic matter. Dissolved oxygen is controlled at0.5-0.7mg/L, at this moment the ammonia nitrogen concentration of effluent of aeration biological filter is all less than 0.2mg/L, has realized the completely nitrated of ammonia nitrogen,Ensure the clean-up effect of this device total nitrogen.

Simulated domestic wastewater is mainly by starch, glucose, peptone, somatose cream, urea, ammonium sulfate, tertiary sodium phosphate etc.Composition is formulated, and its CODcr is 251-520mg/L, and total nitrogen is 35-55mg/L, in the scope that carbon-nitrogen ratio is 6.5-11.5, totalPhosphorus is 5.5-9mg/L;

Wherein, taking intake pump flow velocity as reference, each flow rate pump proportion: intake pump 100%, aeration tank nitrification liquid returns to pump300%, mud surmounts flow rate pump 60%, and mud mixed liquid returns to flow rate pump 100%, and mud returns to flow rate pump 100%;

Mud mixed liquid is in each reaction tank time of staying, and the first anaerobic pond and the second anaerobic pond have 1.5h altogether, one-level anoxic pond 1h,The quick aeration tank 0.3h of one-level, the first secondary anoxic pond and the second secondary anoxic pond have 2h altogether, the quick aeration tank 1h of secondary.

First grade subsides pond supernatant is 2.5h in the BAF time of staying.

Each reaction tank oxidation reduction potential control scope: the second anaerobic pond <-350mv, quick aeration tank-200 of one-level--190mv, the second secondary anoxic pond-120--150mv, quick aeration tank+90 of secondary-+100mv.

The time of staying of mud in device was controlled at about 12 days, one-level anoxic pond, the first anaerobic pond, the second anaerobismThe sludge concentration of pond, the first secondary anoxic pond and the second secondary anoxic pond is controlled in the scope of 2000mg/L ~ 3000mg/L;

Through continuously bimestrial normal operation, when campus life sewage water inlet nitric efficiency is substantially all between 98-99%, removePhosphorus efficiency is substantially between 96.0-98.1%, between the purification efficiency 91.8-95.0% of CODcr. The water concentration that goes out of TN only hasBetween 0.65-0.8, wherein ammonia nitrogen is 0.1-0.25mg/L, nitrate anion between 0.25-0.5mg/L, total phosphorus go out water concentration onlyThere is 0.05-0.3mg/L. Obviously the TN of water outlet reaches the above water quality of surface water 3 class, and ammonia nitrogen reaches surface water 2 class water quality, TP is basicReach the surface water above water quality of 4 class and CODcr and reach the above water quality of surface water one class, successfully realized simulated domestic wastewaterThe target of one step deep purifying.

Adopt the inventive method and other existing method to compare, result is as shown in table 1.

Table 1

Wherein, BCFS technique is the result to the sewage disposal of Dutch holdon Sewage Plant. BCFS is to Dutch dolfshen sewageThe result of factory's sewage disposal. All the other techniques are the results to city domestic sewage processing. From table 1, the inventive method hasGood nitric efficiency and dephosphorization efficiency by using, and effect is all better than other existing forward position technique.

Above content is the further description of the present invention being done in conjunction with concrete preferred embodiment, is convenient to this skillArt those skilled in the art can understand and apply the invention, and can not assert that specific embodiment of the invention is only limited to these to sayBright. For those skilled in the art, without departing from the inventive concept of the premise, can also makeSome simple deductions and replacement, and needn't pass through performing creative labour. Therefore, those skilled in the art takes off according to of the present inventionShow, the improvement that the present invention is made all should be within protection scope of the present invention.

Claims

1. the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus based on On-line Control, is characterized in that,Comprise anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, first grade subsides pond, BAF, secondary anoxic pond, secondaryFast aeration tank, secondary settling tank, oxidation reduction potential determination control system, DO determination control system, aeration subsystem,PLC and computer;

The water inlet end phase of pump and one-level anoxic pond is also returned in the water side of described BAF by aeration tank nitrification liquidConnect;

The water inlet end of anaerobic pond is provided with intake pump;

In described anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, secondary anoxic pond and the quick aeration tank of secondary, be equipped withSubmersible agitator;

Described anaerobic pond, one-level anoxic pond, the quick aeration tank of one-level, BAF, secondary anoxic pond and secondary are quickAeration tank all seals, one-level anoxic pond, the quick aeration tank of one-level, BAF, secondary anoxic pond and the quick aeration of secondaryThe top in pond is equipped with the blast pipe with air bleeding valve; The air chamber of anaerobic pond and one-level anoxic pond is connected;

The top of described secondary settling tank is provided with drainpipe; The bottom mud discharging mouth of secondary settling tank is returned to pump and is detested by mudThe water inlet end in oxygen pond is connected; The bottom mud discharging mouth of secondary settling tank is also connected with sludge pump;

Described PLC is connected with computer.

2. the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization dress based on On-line Control according to claim 1Put, it is characterized in that, described anaerobic pond is to be in series by multiple ponds.

3. the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization dress based on On-line Control according to claim 1Put, it is characterized in that, described secondary anoxic pond is to be in series by multiple ponds.

4. the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization dress based on On-line Control according to claim 1Put, it is characterized in that, described anaerobic pond is that two ponds are in series, and one-level anoxic pond is single pond, and the quick aeration tank of one-level isDan Chi, secondary anoxic pond is two pond series connection, Wei Dan pond, the quick aeration tank of secondary.

5. the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization dress based on On-line Control according to claim 1Put, it is characterized in that, between described PLC and on-line oxidation reduction potential meter, between PLC and frequency converter, PLC and onlineBeing electrically connected between dissolved oxygen instrument and between PLC and computer all adopts 485 to be connected by communication.

6. the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization dress based on On-line Control according to claim 1Put, it is characterized in that, BAF top is cylinder type, and the cone angle that bottom is same diameter is the turbination of 60 degree, circleCone is horizontally disposed with stainless steel sift orifice plate with the joint of cylinder, and mesh size is 5mm, and on sieve tray, load filler and form packing layer,Packing material size is 0.6-1.5cm; Directly over packing layer, be provided with water distributor, water distributor is connected with the water inlet end of BAFLogical; Aeration head in BAF is arranged on sieve tray top, and the distance of aeration head and sieve tray is packing layer thickness1/3；

Wherein, described filler is volcanic rock, haydite, quartz sand or zeolite.

7. the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization dress based on On-line Control according to claim 1Put, it is characterized in that, the water side of described BAF is also connected with the arrival end that cleans discharge pond by draining pump,The top in cleaning discharge pond is returned to pump by supernatant and is connected with the water inlet end of BAF; Clean the bottom row in discharge pondMud mouth returns to pump by clean sludge and is connected with the water inlet end of one-level anoxic pond; Wherein, the water side of BAF and rowBetween water pump, supernatant returns between pump and BAF and cleans discharge pond and clean sludge and return between pump and all establishThere is magnetic valve.

8. the AAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization dress based on On-line Control according to claim 1Put, it is characterized in that, the top of described BAF and not exposing to the sun for BAF provides other two covers of gasThe inlet end of the aeration pump of gas subsystem is connected.

9. a continuous flow double sludge denitrification denitrification dephosphorization technique, adopts claimed in claim 1 based on On-line ControlAAONAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus, is characterized in that, concrete steps are:

Sewage enters anaerobic pond through intake pump, and mud is returned after pump enters anaerobic pond and mixed with sewage by mud, in anaerobismUnder condition, discharge phosphorus, anaerobic pond end arranges oxidation-reduction electrode in order to monitoring and controls the carrying out reacting in anaerobic pond;

Afterwards, the mud mixed liquid flowing out from the quick aeration tank of one-level flows into first grade subsides pond, and the sedimentation separation of first grade subsides pond goes outThe supernatant coming flows into BAF, carries out nitration reaction, obtains nitrification liquid; The water outlet of dissolved oxygen electrode on-line monitoring is dissolvedThe variation of oxygen, and the nitrification liquid dissolved oxygen concentration flowing out from BAF by control aeration control is at 0.5-Between 1.0mg/L, realize the whole nitrated of ammonia nitrogen;

After anti-nitration reaction finishes for the second time, mud mixed liquid flows into the quick aeration tank of secondary from secondary anoxic pond and carries out aerobic suctionThe nitration reaction of phosphorus, nitrogen stripping and remaining ammonia nitrogen; The oxidation-reduction electrode arranging at the end of the quick aeration tank of secondary existsLine monitoring and control the quick aeration tank of secondary oxidation-reduction potential;

First grade subsides pond supernatant is 1-5h in the BAF time of staying;

The gas-water ratio of BAF is: 10-40;

10. continuous flow double sludge denitrification denitrification dephosphorization technique according to claim 9, is characterized in that, in this deviceSludge retention time be 10-17 days.