CN104743669A - Step-feed CAST nitrite denitrifying phosphorus removal method and process control device thereof - Google Patents
Step-feed CAST nitrite denitrifying phosphorus removal method and process control device thereof Download PDFInfo
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Abstract
The invention discloses a step-feed CAST nitrite denitrifying phosphorus removal method and a process control device thereof and belongs to the technical field of SBR and modified process sewage biologic denitrification thereof. The device comprises a selector, a main reaction area, a water inlet pump, a stirrer, a submersible mixer, a return sludge pump, an aerator, an air compressor, a water decanter, a drain valve, a mud valve and a real-time control system. By adopting integration of a multiple-water inlet running mode and a real-time control system, an organic carbon source in the original sewage is furthest utilized and furthermore, the ammoxidation, denitrifying dephosphatation and phosphorus release time in each stage is scientifically and reasonably distributed. The anaerobic stirring time is increased and operation based on a variable-duration anoxic/aerobic mode is adopted, the anoxic phosphorus uptake effect of the selector in the aerobiotic time and the anoxic phosphorus uptake effect of the main reaction area in the anoxic time are reinforced, and the anaerobic stirring time and the aerobic aerating time are controlled by a real-time process control strategy.
Description
Technical field
The present invention relates to segmental influent CAST (Cyclic Activated Sludge System) nitrous acid salt form Denitrifying Phosphorus Removal Technology and process controller thereof, be applicable to nitrogenous, phosphorus Industrial Wastewater Treatment and town sewage advanced treatment, belong to SBR (sequencing batch active sludge) and modification process spent water bio-denitrification technology field thereof.
Background technology
The severe contamination of water resources and scarcity are great international difficult problems for puzzlement current world economy, human survival, especially in a large number unprocessed or arrived very serious stage without the eutrophication problem that the discharge that is nitrogenous, phosphorus sewage of suitably process causes in China, many water body in lake can not play its normal function and seriously have impact on industrial or agricultural and fish production.China proposes strict requirement in the urban wastewater treatment firm pollutant emission standard of issuing and implementation in 2003 to nitrogen, phosphorus discharge, and the construction of Sewage Plant is had higher requirement, will there be denitrogenation, dephosphorization process in newly-built sewage work, denitrogenation, dephosphorization process are not had to raw waste water treatment plant, will change existing facility according to national standard, extend, the principal contradiction of sewage disposal is changed into the removal of nitrogen and phosphorus pollution thing gradually by the removal of organic pollutant.
Activated sludge process is the current main method for administering nitrogen and phosphorus pollution.Biological denitrification process is mainly divided into two portions, is namely nitrate nitrogen by nitrobacteria by mineralized nitrogen, then by denitrifying bacterium, nitrate nitrogen is converted into nitrogen and overflows from water.Biological phosphate-eliminating is also divided into two stages: the first stage is anaerobic phosphorus release, namely acid-producing bacteria is under anaerobism or anoxia condition, larger molecular organics in Decomposition Wastewater is the low-molecular-weight fatty acids such as acetic acid (VFA) or short chain fatty acid (SCFA) etc., polyP bacteria then under anaerobic, polyphosphoric acid salt in decomposer and glycogen etc. produce ATP, utilize ATP to absorb the matrix of acid-producing bacteria generation, synthesis poly-β-hydroxy butyrate (PHB), discharge inorganic phosphorus PO simultaneously
4 3-; Subordinate phase is aerobic phosphate uptake, and namely under aerobic condition, polyP bacteria oxidation PHB, except generate energy is used for own growth synthesis, also external PO
4 3-be transported to synthesis ATP and nucleic acid in body, superfluous PO
4 3-be aggregated into polyphosphoric acid salt to store in vivo, finally, high phosphorus sludge by the mode venting of excess sludge, thus reaches the object of dephosphorization.
Flow process is simple, operational process controllability is high, not easily produce sludge bulking, have the advantages such as certain denitrogenation dephosphorizing performance because having for CAST technique, the first-selected technique of the newly-built middle-size and small-size urban wastewater treatment firm of current China, be also simultaneously traditional activated sludge process sewage work's reconstruction for have denitrogenation, phosphorus removal functional sewage work time alternative process.But, the operation scheme that the CAST technique of current practical application adopts is all based on sequential control substantially, and a such as typical cycle of operation comprises 4 hours, within 2 hours, is wherein water inlet-aeration phase, within 1 hour, be precipitate phase, other 1 hour is bleeding stage.But the shortcoming of the operation scheme of this fixing duration is apparent, can not tackle the influent quality of moment change flexibly, thus cause technique unstable to the removal efficiency of pollutent, effluent quality is not up to standard.In addition, this technique is single sludge suspension growing system, the mixing microorganisms population in same reactor is utilized to complete oxidation operation, biological denitrificaion and biological phosphate-eliminating, influencing each other of this multiprocessing function limits the treatment efficiency of CAST technique in actual applications, also proposes very strict requirement to control.
Nitrobacteria is a kind of chemoautotrophic bacteria; Organic matter degradation is then completed by heterotrophic organism.When this two kinds of bacterium mixed culture, owing to there is the competition to substrate and DO, the growth of nitrifier will be suppressed, and be difficult to become dominant population, due to heterotrophic bacterium to the assimilation speed of ammonia much larger than the rate of oxidation of nitrobacteria to ammonia.When organic loading of intaking is higher, in biological treatment system, dominant different oxygen oxidation bacterial classification will utilize ammonia nitrogen substances to carry out anabolism, consumes dissolved oxygen in a large number, suppresses nitrification.In addition, fixing aeration time likely makes nitrated deficiency of time cause water outlet ammonia nitrogen to exceed standard or spend aeration more causing energy dissipation.Have an appointment in CAST technique 20% oxidation state nitrogen material carry out denitrification by returned sluge, all the other are then realized by the denitrification of synchronous nitration and denitrification and precipitation, lay-up period mud.Although and synchronous nitration and denitrification can adopt intensity adjustable aeration to realize, its effect is undesirable.In precipitation, lay-up period, because organism is fully degraded, the carbon source needed for denitrification is not enough, also limit the further raising of denitrification efficiency.The removal efficiency of total nitrogen is affected, cause thus when having nitric nitrogen to exist in next cycle selector switch internal cause backflow mixed liquor because polyP bacteria and denitrifying bacteria form competition to matrix, make polyP bacteria release phosphorus be suppressed and fully can not put phosphorus, thus affect the ability of the excessive suction phosphorus of polyP bacteria further, and want to improve further dephosphorization efficiency by using, carry out chemical dephosphorization with regard to the outer adding medicine of needs.In addition, dephosphorization and denitrogenation also cause two kinds of nutraceutical high clearances not get both at the demand contradictory on mud age, cause the application of this technique to be restricted.Therefore, in order to realize saving energy and reduce the cost, and ensureing Process for Effluent water quality, needing a kind of Operation Mode Optimization that can regulate each phases-time according to raw water quality.
The principle of short range biological denitrification is controlled by ammonium oxidation, at Nitrification Stage, then by denitrification, cultured water to be reduced to nitrogen, is through NH
4 +-N → NO
2 --N → N
2such approach completes, and whole process comparatively complete nitrification and denitrification shortens greatly.According to the stoichiometry of nitration reaction, compared with complete nitrification and denitrification denitrogenation, the Heterosis of short-cut nitrification and denitrification exists: the COD requirement 1) reducing the denitrification stage about 40%; 2) speed of reaction about exceeds 63%; 3) sludge yield (nitrifying process can produce mud about 33% ~ 35% less, can produce mud about 55% less in denitrification process) is reduced; 4) oxygen requirement of 25% is saved.The denitrogenation processing aspect of short-cut denitrification technology to various wastewater shows good application prospect, domestic and international investigator has also attempted combining from different biological treatment, although improve the removal effect of nitrogen to a certain extent, but for the phosphorus requiring in sewage to remove simultaneously, under the condition that carbon source is limited, usually preferentially carry out denitrification reaction, thus cause the phosphor-removing effect of technique still undesirable.On the other hand, compare traditional aerobic dephosphorization mode, Denitrifying Phosphorus Removal Technology can under anoxic conditions, with NO
3 --N or NO
2 --N, as final electron acceptor(EA), utilizes internal carbon source (PHB), realizes denitrification denitrogenation simultaneously and inhales phosphorus effect, have energy-saving and cost-reducing advantage: 1) COD consumption can save 50% by " carbon is dual-purpose " mode; 2) oxygen consumption reduces by 30%; 3) sludge yield is expected to minimizing 50%.Denitrification dephosphorization theory has broken the theory that denitrogenation dephosphorizing that traditional denitrogenation dephosphorizing mechanism thinks must have been come by obligate denitrifying bacteria and obligate polyP bacteria respectively, dephosphorization and denitrification denitrogenation process are realized by same class microorganism, in this treating processes, NO
3 --N or NO
2 --N is no longer merely considered as the damper of dephosphorization process, it can carry out denitrifying phosphorus uptake reaction as final electron acceptor(EA).Therefore, it is as a kind of Novel sewage biologic treating technique integrating denitrogenation and dephosphorization, the maximum using of resource can be realized, also for alleviating the energy and solving environmental problem and provide a kind of effective approach, control nitrated in the nitrite stage and realize being coupled of Denitrifying Phosphorus Removal Technology and CAST technique, can solve further because of the not high problem of water-inlet carbon source deficiency or the microbial population mud nutrient removal rate that contradiction causes age.
Summary of the invention
The object of the invention is to provide a kind of segmental influent CAST nitrous acid salt form Denitrifying Phosphorus Removal Technology and process controller thereof, the method can not only improve processing efficiency, reduce running cost, and when larger change occurs Pollutant levels of intaking, still can control alternately anoxic/aerobic time exactly owing to have employed real time planning, the capacity of resisting impact load of whole system is improved greatly.
The present invention adopts the integrated of the operation scheme of intaking several times and real-time control system, and make use of the organic carbon source in raw waste water to the full extent, the simultaneously scientific and reasonable every one-phase ammonia oxidation of distribution, denitrifying phosphorus uptake and release time of phosphorus.Increase the anoxia stirring period and adopt change duration anoxic/aerobic mode to run, the anoxic enhancing aerobic period selector inhales the anoxic suction phosphorus effect of phosphorus effect and anoxic period main reaction region, and the time controlling anoxia stirring and aerobic aeration is realized by real time planning strategy.
This invention takes following technical scheme.Segmental influent CAST nitrous acid salt form denitrification dephosphorization device of the present invention, it is characterized in that, include selector switch (1), main reaction region (2), raw waste water is squeezed into the intake pump (3) in selector switch (1), be arranged on the agitator (4) in selector switch (1), be arranged on the submersible agitator (5) in main reaction region (2), for mud to be back to the return sludge pump (6) of selector switch (1) from main reaction region (2) end, the set aerator (7) in bottom, main reaction region (2), the air compressor (8) be connected with aerator (7), the water discharge valve (10) being arranged on the water decanter (9) in main reaction region (2) and being attached thereto, for discharging the mud valve (11) of main reaction region (2) interior excess sludge, real-time control system (12), the DO (dissolved oxygen) be connected with real-time control system (12), ORP (redox potential), pH sensor.Described real-time control system (12) comprises for controlling the time relay, computer and the connection data collecting card on computers that connect intake pump (3), agitator (4), submersible agitator (5), return sludge pump (6), air compressor (8), water decanter (9), water discharge valve (10) and mud valve (11).
Two portions that selector switch (1) and main reaction region (2) are pond body, front end is selector switch (1), rear end is main reaction region (2), be provided with dividing plate between selector switch (1) and main reaction region (2), the bottom of dividing plate is provided with through hole and selector switch (1) is communicated with main reaction region (2).
Adopt said apparatus sewage to be carried out to the method for synchronous denitrification dephosphorizing process, comprise the following steps:
1) intake/stir and open intake pump (3) by real-time control system (12) and open selector switch (1) interior agitator (4), return sludge pump (6) is opened while water inlet, under the quantity of reflux preset, mud is back to selector switch (1) by main reaction region (2) end, and open main reaction region (2) interior submersible agitator (5), first system is carried out anoxic process and is remained in a small amount of nitrite in main reaction region with a cycle on denitrification, denitrification process is by ORP, pH real time sensor is monitored, and in real time obtained data information transfer is processed to computer by data collecting card, to reach the control to water inlet and churning time, when pH value curve occurring maximum value (dpH/dt starts < 0), there is flex point (d in ORP curve simultaneously
2oRP/dt
2start < 0, as follows according to the parametric procedure of the corresponding real-time control method schematic diagram 3 of process difference), show that denitrification process terminates, intake pump (3) continues to add raw waste water in selector switch (1), now pH value transfers decline to by rising, ORP value fall off rate is accelerated simultaneously, show that system enters the anaerobic acid-production stage, polyP bacteria in selector switch (1) and main reaction region (2) carries out putting phosphorus activity, water inlet and anaerobism churning time are controlled by the time relay connecting intake pump (3), arrive and estimate flooding time and complete anaerobism to put phosphorus, close intake pump (3) and submersible agitator (5), stop water inlet stirring, above-mentioned arrival estimates that flooding time fixed time can rule of thumb, as this expectation flooding time be 1/3 required time entering reactor total Water time, it is abundant that anaerobism puts phosphorus,
2) after aeration stops water inlet stirring, air compressor (8) is opened by real-time control system (12), the pressurized air provided by air compressor (8) enters aerator (7), oxygen supply in main reaction region (2) mixed solution, carries out organic degraded, the ammoxidation of nitrogenous compound and aerobic phosphate uptake reaction; Meanwhile, be back to by main reaction region (2) end the NO carried in the mixed solution of selector switch (1) by return sludge pump (6)
2 -for carrying out denitrifying phosphorus uptake; Whole process is by DO, ORP, pH Sensor monitoring, and by data collecting card in real time by the real-time control of obtained data transmission to computer-implemented aeration time, when pH value curve occurring mnm. (dpH/dt starts >0), there is hop in DO value, there is platform in ORP curve simultaneously, show ammonia oxidation end of processing, now close air compressor (8), stop aeration, then system enters next process;
3) water inlet/anoxia stirring is opened intake pump (3) by real-time control system (12) and is opened submersible agitator (5), selector switch carries out anaerobic phosphorus release in (1), and main reaction region is then carried out with NO in (2)
2 -for the denitrifying phosphorus uptake of electron acceptor(EA), denitrification process is monitored by ORP, pH real time sensor, and in real time obtained data information transfer is processed to computer by data collecting card, to reach the control to water inlet and churning time, when pH value curve occurring maximum value (dpH/dt starts < 0), there is flex point (d in ORP curve simultaneously
2oRP/dt
2start < 0), show that electron acceptor(EA) thoroughly exhausts, denitrifying phosphorus uptake end of processing, system enters next process;
4) repeating step 2), step 3) two steps, the number of times of repetition requires change with raw waste water water quality and the process water yield; After flooding quantity reaches the process water yield preset, close intake pump (3) and submersible agitator (5), system enters next process;
5) aeration opens air compressor (8) by real-time control system (12) afterwards, the pressurized air provided by air compressor (8) enters aerator (7), oxygen supply in main reaction region (2) mixed solution, carries out ammoxidation and the aerobic phosphate uptake reaction of nitrogenous compound in one water inlet last.
6) at the end of the rear aeration operation of precipitation, by the time relay in real-time control system (12) according to the time controling sedimentation time preset, now intake pump (3), agitator (4), submersible agitator (5), return sludge pump (6), air compressor (8), water decanter (9), water discharge valve (10) and mud valve (11) are all in closing condition;
7) after the drainage sedimentation stage terminates, under real-time control system (12) regulates, water strainer without power source (9) is started working, after processing, water is discharged through water discharge valve (10), and water discharge time is controlled by the time relay be connected on water strainer without power source (9);
8) leave unused under real-time control system (12) regulates, all valves, rly. and volume pump in whole reactive system are all closed, and reactor is neither intake also not draining, is in holding state, completes one-period;
9) system repeats 1 successively), 2), 3), 4), 5), 6), 7), 8) each step, automatically each step duration is regulated according to raw water quality or water yield change, whole system alternately experiences anaerobism, aerobic, anoxic condition, segmental influent and interval water outlet, and when each end cycle via the remaining active sludge of mud valve (11) periodic exhaustion.
Fig. 3 is shown in by the corresponding real-time control method schematic diagram of said process.
The device that the present invention designs mainly comprises rectangular parallelepiped reaction tank, and (pond body is divided into two portions, front end is selector switch, rear end is main reaction region), be placed on the aerator (7) in reaction tank main reaction region (2), the agitator (4) of selector switch (1) and main reaction region (2) and submersible agitator (5) and DO, ORP, pH sensor, intake pump (3), return sludge pump (6), air compressor (8), water decanter (9), outlet valve (10), mud valve (11), real-time control system (12).In the present invention, water decanter used is water strainer without power source, is made up of with the water-freeing arrangement be attached thereto and transmission mechanism the water collector of liquid level.
Principle of work of the present invention and process:
(1) add raw waste water, make the amount of the organic carbon source that can be utilized by denitrifying bacteria wherein contained just to meet in system upper one-period the denitrifying requirement of nitric nitrogen that remains.Denitrification process nitric nitrogen is constantly reduced to nitrogen, and reactive system internal oxidition state material is constantly reduced, and therefore ORP value constantly declines, and after denitrification terminates completely, owing to entering anaerobic state, ORP fall off rate is accelerated, and flex point appears in ORP curve.Denitrification process is owing to constantly producing basicity simultaneously, so pH value can continue to rise, at the end of denitrification, owing to entering the anaerobic fermentation and acid production stage, so pH value can become decline from rising, occurs weight break point.According to above unique point, we accurately can judge the process of anti-nitration reaction.After denitrification terminates, continue to add raw waste water, system enters the anaerobic fermentation and acid production stage, pH value transfers decline to by rising, ORP value also declines to a great extent simultaneously, show to start in main reaction region to put phosphorus, ensure that putting phosphorus reaction carries out stopping intake pump completely and closing submersible agitator in main reaction region, avoids the carbon source too much caused into water waste and save running cost;
(2) start air compressor and carry out aeration, a small amount of organism in aerobic removal water, be then nitrite nitrogen by ammonium oxidation in water, namely carry out oxidative ammonolysis.Meanwhile, in main reaction region, polyP bacteria absorbs a part of phosphorus under aerobic condition, and the nitrite that selector switch is brought into because of backflow mixed liquor changes anaerobic environment into by anaerobic environment, and polyP bacteria wherein carries out the denitrifying phosphorus uptake reaction of nitrous acid salt form.The bubble produced in the aeration process of main reaction region makes sewage fully contact with active sludge, serves the effect be uniformly mixed.Active sludge oxidation Organic substance in water and ammonia nitrogen are aerobic processeses, therefore when organic matter degradation completely, at the end of oxidative ammonolysis, oxygen in water will no longer be utilized by microorganism, DO value there will be and rises to, water oxygen state material also no longer increases, and platform appears in ORP value.Meanwhile, oxidative ammonolysis is a reaction of producing acid, and therefore at the end of oxidative ammonolysis, pH value can become rising from decline.According to above unique point, we can reaction process in accurately understanding system, at the end of oxidative ammonolysis, stops aeration, avoids excess aeration and the energy wasted.
(3) add appropriate raw waste water, make organic carbon source wherein put phosphorus for polyP bacteria in selector switch, and this puts phosphorus amount just for denitrifying phosphorus uptake that the nitrite produced with aeration phase ammonia oxidation is electron acceptor(EA).Process according to the feature point pairs denitrifying phosphorus uptake reaction on pH and ORP curve is controlled, and at the end of denitrifying phosphorus uptake, stops water inlet stirring.
(4) repeat aeration to carry out ammonia oxidation and add the process (n time) that appropriate raw waste water carries out denitrifying phosphorus uptake.The equal on-line checkingi DO of all processes, ORP, the pH value of reaction, be identified in the unique point of line traffic control parameter according to the control strategy of real-time control system, carry out process control to each stepping journey of reaction.
(5) aeration is up to standard to ensure water outlet nitrogen phosphorus afterwards, and Mud up-floating when preventing the water outlet caused because hypoxic exposure is long.
(6), after reaction process terminates, enter precipitation, draining, idle stage successively, and repeat above step successively with certain cycle, and according to sludge age periodic exhaustion mud.
Fig. 3 is shown in by said process real-time control method schematic diagram.
The present invention has following advantages:
(1) this technique is compared with traditional CAS T method, owing to make use of the organic carbon source in raw waste water fully, thus save the expense of outer throwing carbon source, simultaneously, because the organism in sewage is maximized utilization, namely for denitrifying phosphorus uptake thus to achieve a carbon dual-purpose, this saves on the oxygen of oxidation required for these organism, both save the energy consumption of air compressor, alleviate again the impact of organism on ammonia oxidation process.
(2) owing to have employed segmental influent form, water inlet/anaerobism the period, what selector switch and main reaction region were mainly carried out be anaerobism puts phosphorus reaction, the aerobic period, and what main reaction region was mainly carried out is ammonia oxidation and aerobic suction phosphorus reaction, denitrifying phosphorus uptake reaction is carried out in selector switch, the anoxic period, denitrifying phosphorus uptake reaction is carried out in main reaction region, and the function of selector switch then changes anaerobic phosphorus release into, therefore, hocket and put phosphorus and inhaled phosphor intensified the phosphorus removal property of system in this process selector and main reaction region.
(3) adopt Real-Time Control Strategy to control aerobic aeration in biological denitrification process and anoxia stirring time, fundamentally solve aeration or the ammonia oxidation caused by churning time deficiency or denitrifying phosphorus uptake incomplete sum aeration or the long raising of brought running cost of churning time and the waste of the energy.And former water dosage needed for each biochemical reaction, reaction times can be controlled in real time according to the change of the raw water quality water yield, realize that there is intelligentized control.
(4) what agent set adopted is CAST technique, and organism and nitrogenous compound and phosphorus are removed in a reaction tank, decreases the process such as anoxic pond and settling tank structures, thus reduces the floor space of initial cost and whole technique.
(5) whole technique is completed by real-time control system, have bookkeeping convenient, expense is low, anti impulsion load is strong and the upper cycle remains nitrite nitrogen denitrification terminates to continue the anaerobic phosphorus release stage that water inlet strengthens main reaction region and make system more not easily sludge bulking occur afterwards.
The process of the trade effluent that the present invention can be widely used in Small Urban municipal effluent or organism, the content of nitrogen and phosphorous changes greatly, is specially adapted to the sewage work adopting the sewage work of CAST technique or prepare to adopt CAST technique.
Accompanying drawing explanation
Fig. 1 is the operation schematic diagram that the present invention operates;
Fig. 2 is apparatus of the present invention structural representations;
Fig. 3 is Real-Time Control Strategy schematic diagram of the present invention;
In figure: 1. selector switch; 2. main reaction region; 3. intake pump; 4. agitator; 5. submersible agitator; 6. return sludge pump; 7. aerator; 8. air compressor; 9. water decanter; 10. water discharge valve; 11. mud valves; 12. real-time control systems.
Embodiment
Describe the present invention in detail below in conjunction with drawings and Examples, but the present invention is not limited to following examples.
Device provided by the invention is as shown in Figure 2: comprise selector switch 1, main reaction region 2, raw waste water is squeezed into the intake pump 3 in selector switch 1, be arranged on the agitator 4 in selector switch 1, be arranged on the submersible agitator 5 in main reaction region 2, for mud to be back to the return sludge pump 6 of selector switch 1 from main reaction region 2, set aerator 7 bottom main reaction region 2, be connected to the air compressor 8 on aerator 7, the water discharge valve 10 being arranged on the water decanter 9 in main reaction region 2 and being attached thereto, for discharging the mud valve 11 of excess sludge in main reaction region 2, real-time control system 12, the DO be connected with real-time control system 12, ORP, pH sensor.Described real-time control system 12 is for controlling to comprise the time relay, computer and the connection data collecting card on computers that are connected to intake pump 3, agitator 4, submersible agitator 5, return sludge pump 6, air compressor 8, water decanter 9, water discharge valve 10 and mud valve 11.
The process control steps of the segmental influent CAST nitrous acid salt form denitrification dephosphorization in the present embodiment as shown in Figure 1, Figure 3, comprises following operation:
I intake/stir segmental influent CAST nitrous acid salt form Denitrifying Phosphorus Removal Technology provided by the present invention operation operation as shown in Figure 1, first by opening intake pump 3 by real-time control system 12 and opening agitator 4 in selector switch 1; Return sludge pump 6 is opened while water inlet, under the quantity of reflux preset, mud is back to selector switch 1 by main reaction region 2 end, and open submersible agitator 5 in main reaction region 2, system carries out anoxic denitrification denitrification process, denitrification process is monitored by ORP, pH real time sensor, and in real time obtained data information transfer is processed to computer by data collecting card, to reach the control to water inlet and churning time, when maximum value appears in pH value curve, there is flex point in ORP curve simultaneously, show that denitrification process terminates.After denitrification terminates, intake pump 3 continues to add raw waste water in selector switch 1, now pH value transfers decline to by rising, ORP value fall off rate is accelerated simultaneously, and show that system enters the anaerobic acid-production stage, polyP bacteria carries out putting phosphorus activity, water inlet and anaerobism churning time are controlled by the time relay, complete and estimate that water inlet/anaerobism closes intake pump 3 and submersible agitator 5 after stirring, stop water inlet stirring, enter the IIth procedure.
II aeration starts air compressor 8, be adjusted to appropriate aeration rate and aeration is carried out to reactive system, the pressurized air provided by air compressor 8 enters aerator 7 by inlet pipe, with the form of micro-bubble to the efficient oxygen supply of active sludge intermixture, and sewage is fully contacted with active sludge, whole process is implemented to control by real-time control system 12, main according to the DO settled in reaction tank, ORP, the unique point that pH sensor shows in reaction process obtains the information of reaction process indirectly, and in real time obtained data information transfer is processed to computer by data collecting card again, finally reach the control to aeration time, after real-time control system 12 obtains characterizing the signal that completes of ammonia oxidation, close air compressor 8, stop aeration, then system enters the IIIth procedure.
III water inlet/anoxia stirring is opened intake pump 3 by real-time control system 12 and is opened submersible agitator 5, carries out anaerobic phosphorus release, then carry out with NO in main reaction region 2 in selector switch 1
2 -for the denitrifying phosphorus uptake of electron acceptor(EA), denitrification process is monitored by ORP, pH real time sensor, and in real time obtained data information transfer is processed to computer by data collecting card, to reach the control to water inlet and churning time, when maximum value appears in pH value curve, there is flex point in ORP curve simultaneously, show that electron acceptor(EA) thoroughly exhausts, denitrifying phosphorus uptake end of processing, system enters the IVth procedure;
IV repeating step II, III, the number of times of repetition requires change with raw waste water water quality and the process water yield; After flooding quantity reaches the process water yield preset, close intake pump 3 and submersible agitator 5, system water inlet the Vth procedure;
After V, aeration opens air compressor 8 by real-time control system 12, the pressurized air provided by air compressor 8 enters aerator 7, oxygen supply in the mixed solution of main reaction region 2, carries out ammoxidation and the aerobic phosphate uptake reaction of nitrogenous compound in one water inlet last.
At the end of the nitrated operation of VI precipitation aeration, by the time relay in real-time control system 12 according to the time controling sedimentation time preset, now intake pump 3, agitator 4, submersible agitator 5, return sludge pump 6, air compressor 8, water decanter 9, water discharge valve 10 and mud valve 11 are all in closing condition.
After VII drainage sedimentation stage terminated, drainage procedure starts (the VIth procedure).Under real-time control system 12 regulates, water strainer without power source 9 is started working, and discharged through water discharge valve 10 by water after process, water discharge time is controlled by the time relay be connected on water strainer without power source 9.
VIII idle draining terminates to start to be defined as lay-up period (the VIIth procedure) to next cycle.As required, setting idle mixing time, under real-time control system 12 regulates, all valves, rly. and volume pump in whole reactive system are all closed, and reaction tank is neither intake also not draining, is in holding state.
IX whole system is controlled to repeat water inlet/stirring, aeration, precipitation, draining and idle 5 operations in turn by real-time control system 12, whole system is made to be in anaerobism, anoxic, the aerobic state replaced all the time, segmental influent and interval water outlet, and open mud valve 11 when each end cycle via the remaining active sludge of shore pipe periodic exhaustion.
The present invention can be widely used in the process of Small Urban municipal effluent, is specially adapted to the sewage work adopting the sewage work of CAST technique or prepare to adopt CAST technique.First DO, ORP and pH value care testing device should be possessed, after treating system stable operation, observation DO, ORP and pH value are at organics removal, ammonia oxidation, the Changing Pattern put in phosphorus and denitrifying phosphorus uptake biochemical reaction process, according to the characteristic rule of Parameters variation, the software controlled in real time, hardware system are combined with DO, ORP, pH value on-line checkingi, and adjust some parameter and control law according to practical operation situation, such as reflux ratio, water inlet/stirring and sedimentation time etc., to obtain desirable effluent quality.
Embodiment:
Using the actual domestic wastewater of certain university's dependents' district discharge as experimental subjects (pH=6.5 ~ 7.8, COD=260 ~ 350mg/L, TN=35 ~ 65mg/L, TP=3.5 ~ 7.5mg/L).Selected CAST reactor useful volume 54L, in reactor, initial MLSS is at 3.5 ~ 4.0g/L, and aeration rate is constant in 0.5m
3/ h, mud maintains about 10d age, temperature of reaction 22 DEG C.Utilize CAST segmental influent intensified denitrification and dephosphorization technology and process controller thereof, process water yield 18L, segmentation number of times is 3 times, and in final outflow water, COD is less than 50mg/L, total nitrogen is less than 10mg/L, total phosphorus is less than 0.5mg/L, lower than the concentration required by national grade one discharge standard.
Claims (4)
1. segmental influent CAST nitrous acid salt form denitrification dephosphorization device, it is characterized in that, include selector switch (1), main reaction region (2), raw waste water is squeezed into the intake pump (3) in selector switch (1), be arranged on the agitator (4) in selector switch (1), be arranged on the submersible agitator (5) in main reaction region (2), for mud to be back to the return sludge pump (6) of selector switch (1) from main reaction region (2) end, the set aerator (7) in bottom, main reaction region (2), the air compressor (8) be connected with aerator (7), the water discharge valve (10) being arranged on the water decanter (9) in main reaction region (2) and being attached thereto, for discharging the mud valve (11) of main reaction region (2) interior excess sludge, real-time control system (12), the DO (dissolved oxygen) be connected with real-time control system (12), ORP (redox potential), pH sensor, described real-time control system (12) comprises for controlling the time relay, computer and the connection data collecting card on computers that connect intake pump (3), agitator (4), submersible agitator (5), return sludge pump (6), air compressor (8), water decanter (9), water discharge valve (10) and mud valve (11),
Two portions that selector switch (1) and main reaction region (2) are pond body, front end is selector switch (1), rear end is main reaction region (2), be provided with dividing plate between selector switch (1) and main reaction region (2), the bottom of dividing plate is provided with through hole and selector switch (1) is communicated with main reaction region (2).
2. according to the segmental influent CAST nitrous acid salt form denitrification dephosphorization device of claim 1, it is characterized in that, water decanter used is water strainer without power source, is made up of with the water-freeing arrangement be attached thereto and transmission mechanism the water collector of liquid level.
3. adopt right to see the method for the device denitrification dephosphorization requiring 1, it is characterized in that, comprise the following steps:
1) intake/stir and open intake pump (3) by real-time control system (12) and open selector switch (1) interior agitator (4), return sludge pump (6) is opened while water inlet, under the quantity of reflux preset, mud is back to selector switch (1) by main reaction region (2) end, and open main reaction region (2) interior submersible agitator (5), first system is carried out anoxic process and is remained in a small amount of nitrite in main reaction region with a cycle on denitrification, denitrification process is by ORP, pH real time sensor is monitored, and in real time obtained data information transfer is processed to computer by data collecting card, to reach the control to water inlet and churning time, when maximum value appears in pH value curve, there is flex point in ORP curve simultaneously, show that denitrification process terminates, intake pump (3) continues to add raw waste water in selector switch (1), now pH value transfers decline to by rising, ORP value fall off rate is accelerated simultaneously, show that system enters the anaerobic acid-production stage, polyP bacteria in selector switch (1) and main reaction region (2) carries out putting phosphorus activity, water inlet and anaerobism churning time are controlled by the time relay connecting intake pump (3), arrive and estimate flooding time and complete anaerobism to put phosphorus, close intake pump (3) and submersible agitator (5), stop water inlet stirring,
2) after aeration stops water inlet stirring, air compressor (8) is opened by real-time control system (12), the pressurized air provided by air compressor (8) enters aerator (7), oxygen supply in main reaction region (2) mixed solution, carries out organic degraded, the ammoxidation of nitrogenous compound and aerobic phosphate uptake reaction; Meanwhile, be back to by main reaction region (2) end the NO carried in the mixed solution of selector switch (1) by return sludge pump (6)
2 -for carrying out denitrifying phosphorus uptake; Whole process is by DO, ORP, pH Sensor monitoring, and by data collecting card in real time by the real-time control of obtained data transmission to computer-implemented aeration time, when pH value curve occurring mnm., there is hop in DO value, there is platform in ORP curve simultaneously, show ammonia oxidation end of processing, now close air compressor (8), stop aeration, then system enters next process;
3) water inlet/anoxia stirring is opened intake pump (3) by real-time control system (12) and is opened submersible agitator (5), selector switch carries out anaerobic phosphorus release in (1), and main reaction region is then carried out with NO in (2)
2 -for the denitrifying phosphorus uptake of electron acceptor(EA), denitrification process is monitored by ORP, pH real time sensor, and in real time obtained data information transfer is processed to computer by data collecting card, to reach the control to water inlet and churning time, when maximum value appears in pH value curve, there is flex point in ORP curve simultaneously, show that electron acceptor(EA) thoroughly exhausts, denitrifying phosphorus uptake end of processing, system enters next process;
4) repeating step 2), step 3) two steps, the number of times of repetition requires change with raw waste water water quality and the process water yield; After flooding quantity reaches the process water yield preset, close intake pump (3) and submersible agitator (5), system enters next process;
5) aeration opens air compressor (8) by real-time control system (12) afterwards, the pressurized air provided by air compressor (8) enters aerator (7), oxygen supply in main reaction region (2) mixed solution, carries out ammoxidation and the aerobic phosphate uptake reaction of nitrogenous compound in one water inlet last;
6) at the end of the rear aeration operation of precipitation, by the time relay in real-time control system (12) according to the time controling sedimentation time preset, now intake pump (3), agitator (4), submersible agitator (5), return sludge pump (6), air compressor (8), water decanter (9), water discharge valve (10) and mud valve (11) are all in closing condition;
7) after the drainage sedimentation stage terminates, under real-time control system (12) regulates, water strainer without power source (9) is started working, after processing, water is discharged through water discharge valve (10), and water discharge time is controlled by the time relay be connected on water strainer without power source (9);
8) leave unused under real-time control system (12) regulates, all valves, rly. and volume pump in whole reactive system are all closed, and reactor is neither intake also not draining, is in holding state, completes one-period;
9) system repeats 1 successively), 2), 3), 4), 5), 6), 7), 8) each step, automatically each step duration is regulated according to raw water quality or water yield change, whole system alternately experiences anaerobism, aerobic, anoxic condition, segmental influent and interval water outlet, and when each end cycle via the remaining active sludge of mud valve (11) periodic exhaustion.
4. according to the method for claim 3, it is characterized in that, estimate that flooding time is 1/3 required time entering reactor total Water.
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