CN114230086A - Sewage treatment device and high-performance MBR (membrane bioreactor) combined process - Google Patents
Sewage treatment device and high-performance MBR (membrane bioreactor) combined process Download PDFInfo
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- 239000010802 sludge Substances 0.000 claims abstract description 33
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a sewage treatment device and a high-performance MBR (membrane bioreactor) combined process.A sewage enters a section of anoxic tank after being subjected to biological phosphorus release by an anaerobic tank, and denitrification conditions are provided for back-end nitrifying liquid to flow back in an anoxic environment so as to realize a denitrification function; meanwhile, phosphorus accumulating bacteria in the sewage are suppressed under anaerobic and anoxic conditions to release phosphate in the sewage and then quickly degrade organic matters, the phosphate is converted into poly-B-hydroxybutyrate, and the poly-B-hydroxybutyrate stored in the sewage is degraded after the phosphorus accumulating bacteria enter a section of aerobic tank to generate energy for synthesizing cells and excessively absorbing phosphorus dissolved in the sewage; the sewage in the first-section aerobic tank enters a second-section anoxic tank to complete secondary denitrification and COD removal; the sewage flows into a second-section aerobic tank, the second-section aerobic tank provides survival conditions for aerobic bacteria by virtue of oxygen supplied by a micropore aeration system at the bottom of the tank, and a stop valve is arranged between the second-section aerobic tank and the membrane unit so as to facilitate the separation of the biochemical unit and the membrane unit at any time; the effluent quality is good, the operation cost is low, the system has strong impact resistance, the sludge amount is small, and the automation degree is high; when the water quantity is larger, the occupied area is small, and the integration and the transportation are convenient.
Description
Technical Field
The invention relates to the technical field of membrane bioreactors, in particular to a sewage treatment device and a high-performance MBR (membrane bioreactor) combined process.
Background
The conventional biological nitrogen and phosphorus removal process is in an arrangement form of anaerobic (A)/anoxic (A)/aerobic (O), has simple steps, short retention time in a reactor and poor nitrogen and phosphorus removal efficiency, and the traditional A process2the/O process is a typical denitrification and dephosphorization process, and a biological reaction tank of the process consists of three sections, namely, Anaerobic (ANAEROBIC), ANOXIC (ANOXIC) and OXIC (aerobic). The method is characterized in that the anaerobic section, the anoxic section and the aerobic section have clear functions and clear boundary lines, the space-time proportion and the operation condition of the three sections can be artificially created and controlled according to the water inlet condition and the water outlet requirement, the higher denitrification rate can be achieved as required as long as the carbon source is sufficient (the TKN/COD is less than or equal to 0.08 or the BOD/TKN is more than or equal to 4), but the related sewage treatment equipment can cause transportation inconvenience due to three-over (ultra-long, ultra-wide and ultra-high), and the biochemical region and the membrane region can also interfere with each other to influence the treatment effect.
For large-scale sewage treatment and emergency treatment, transportation and other condition limitations often affect the transportation and treatment speed of traditional sewage treatment equipment, and no equipment processing technology can improve the traditional A process2The sewage treatment speed of the/O is not limited by equipment transportation at the same time.
Disclosure of Invention
The invention aims to provide a sewage treatment device and a high-performance MBR (membrane bioreactor) combined process, and aims to solve the technical problems that a biochemical area and a membrane area interfere with each other during sewage treatment, sewage treatment equipment exceeds three levels, transportation is inconvenient, and the sewage treatment speed is difficult to be faster in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-performance MBR combined process comprises the following steps:
s1: the raw water is collected by a pipe network and then is subjected to primary deslagging treatment to enter an adjusting tank, the adjusting tank is used for adjusting the water quality and the water quantity and adjusting the ph for a fixed time, and a submersible pump in the adjusting tank lifts the sewage to an anaerobic tank;
s2: the anaerobic tank and the first-stage anoxic tank carry out biological phosphorus release on the sewage and then enter the first-stage aerobic tank,
wherein, the phosphorus accumulating bacteria in the sewage is inhibited under anaerobic and anoxic conditions to release phosphate in the body and then quickly degrade organic matters, the phosphate is converted into poly-B-hydroxybutyrate, the phosphorus accumulating bacteria enters a section of aerobic tank and then degrades the poly-B-hydroxybutyrate stored in the body to generate energy for synthesizing cells and excessively absorbing the phosphorus dissolved in the sewage,
the first-stage anoxic tank performs denitrification TN removal on the sewage;
s3: the sewage in the first-section aerobic tank enters a second-section anoxic tank to complete secondary denitrification and COD removal;
s4: the sewage flows into a second-section aerobic tank, the second-section aerobic tank provides survival conditions for aerobic bacteria by virtue of oxygen supplied by a micropore aeration system at the bottom of the tank, the second-section aerobic tank is communicated with the membrane unit, and a stop valve is arranged between the second-section aerobic tank and the membrane unit so as to facilitate the separation of the biochemical unit and the membrane unit;
s5: the membrane unit is cleaned at regular time by clear water backwashing, chemical backwashing and chemical soaking cleaning procedures, so that the membrane unit is ensured to have good water flux and can continuously and stably discharge water.
A wastewater treatment plant comprising: a plurality of mobile boxes, wherein a biochemical unit, a membrane unit and an equipment room are arranged in each mobile box,
the biochemical unit comprises an anaerobic tank, a first-section anoxic tank, a first-section aerobic tank, a second-section anoxic tank and a second-section aerobic tank which are sequentially communicated;
the two sections of aerobic tanks are communicated with the membrane unit, and a stop valve is arranged between the two sections of aerobic tanks and the membrane unit so as to facilitate the separation of a biochemical area and the membrane area;
the device room is internally provided with a water production pump, a water inlet of the water production pump is connected to the membrane unit through a first pipeline, and a water inlet of the water production pump is connected with the ultraviolet sterilizer.
Preferably, stirrers are arranged in the anaerobic tank, the first-stage anoxic tank and the second-stage anoxic tank.
Preferably, a blast aeration device is further arranged in the equipment room, and the bottoms of the first section aerobic tank, the second section aerobic tank and the membrane unit are connected to the blast aeration device through second pipelines.
Preferably, a backwashing dosing pump is further arranged between the second-stage anoxic tank and the membrane unit.
Preferably, the terminal mud-water mixture that flows back to one section oxygen deficiency pond through the mud backwash pump of the box of membrane unit realizes the denitrification denitrogenation function, discharges the surplus sludge to storing up the mud pond through the pipeline branch regularly simultaneously.
Preferably, the membrane unit adopts an MBR membrane module, the filtering membrane of the MBR membrane module adopts an external pressure type hollow fiber curtain membrane, and the MBR membrane module comprises a membrane pool pipe gallery and a push-pull cover plate.
Preferably, a grating is arranged at the water inlet end of the anaerobic tank, and a hair filter is arranged in the grating.
Preferably, the agitator adopts hyperboloid vertical agitator, and the mixing effect is even, and hydraulic flow does not have the dead angle, and it is better than traditional dive agitator operation effect.
Preferably, the blast aeration device adopts a rotary blower, and an air outlet of the rotary blower is divided into two pipelines which are respectively connected to the membrane area and the aeration system.
The sewage treatment device and the high-performance MBR combined process provided by the invention have the advantages of good effluent quality, low operation cost, strong system impact resistance, small sludge amount and high automation degree; when the water quantity is larger, the occupied area is small, and the integration and the transportation are convenient.
On the one hand, the biochemical region and the membrane region can be separated from each other without mutual interference, on the other hand, the independent automatic operation of a single set of device can be realized, the treated water quantity and the retention time are matched to achieve the water quality of the outlet water, the water quantity is better, and the device can also be automatically operated in parallel, so that the problems of three super (length, width and height) and inconvenient transportation of the device are solved, and the device can meet the requirements of various water qualities and water quantities on the market.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a high performance MBR integrated process according to the present invention;
fig. 2 is a block diagram of an embodiment of the present invention.
In the figure: 1. moving the box body; 2. a device room; 3. an anaerobic tank; 4. a first anoxic tank; 5. a section of aerobic tank; 6. a second-stage anoxic tank; 7. a second-section aerobic tank; 8. a shut-off valve; 9. blast aeration; 10. a water production pump; 11. a stirrer; 12. a membrane unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The following describes in detail a specific embodiment of the present invention with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding features. The figures are only schematic and are not necessarily drawn to scale.
A2the/O process is a simple synchronous dephosphorization and denitrification process on the system, the total hydraulic retention time is shorter than that of other similar processes, filamentous bacteria can be inhibited from propagating under the condition of anaerobic (anoxic) and aerobic alternate operation, the sludge bulking is overcome, the SVI value is generally less than 100, the separation of sewage and sludge is favorably treated, only mild stirring is needed in the anaerobic section and the anoxic section during operation, the operation cost is low, and the three sections of anaerobic, anoxic and aerobic are strictly separated, so that the process is favorable for the propagation, growth, denitrification and dephosphorization of different microbial floras to have good denitrification and denitrification effects.
A high-performance MBR combined process comprises the following steps:
s1: the raw water is collected by a pipe network and then is subjected to primary deslagging treatment to enter an adjusting tank, the adjusting tank is used for adjusting the water quality and the water quantity and adjusting the ph for a fixed time, and a submersible pump in the adjusting tank lifts the sewage to an anaerobic tank;
s2: the anaerobic tank and the first-stage anoxic tank carry out biological phosphorus release on the sewage and then enter the first-stage aerobic tank,
wherein, the phosphorus accumulating bacteria in the sewage is inhibited under anaerobic and anoxic conditions to release phosphate in the body and then quickly degrade organic matters, the phosphate is converted into poly-B-hydroxybutyrate, the phosphorus accumulating bacteria enters a section of aerobic tank and then degrades the poly-B-hydroxybutyrate stored in the body to generate energy for synthesizing cells and excessively absorbing the phosphorus dissolved in the sewage,
the first-stage anoxic tank performs denitrification TN removal on the sewage;
s3: the sewage in the first-section aerobic tank enters a second-section anoxic tank to complete secondary denitrification and COD removal;
s4: the sewage flows into a second-section aerobic tank, the second-section aerobic tank provides survival conditions for aerobic bacteria by virtue of oxygen supplied by a micropore aeration system at the bottom of the tank, the second-section aerobic tank is communicated with the membrane unit, and a stop valve is arranged between the second-section aerobic tank and the membrane unit so as to facilitate the separation of the biochemical unit and the membrane unit;
s5: the membrane unit is cleaned at regular time by clear water backwashing, chemical backwashing and chemical soaking cleaning procedures, so that the membrane unit is ensured to have good water flux and can continuously and stably discharge water.
A wastewater treatment plant comprising: a plurality of mobile boxes 1, wherein the mobile boxes are internally provided with biochemical units, membrane units and equipment rooms,
the biochemical unit comprises an anaerobic tank 3, a first-section anoxic tank 4, a first-section aerobic tank 5, a second-section anoxic tank 6 and a second-section aerobic tank 7 which are sequentially communicated;
the two-section aerobic tank is communicated with the membrane unit, and a stop valve 8 is arranged between the two-section aerobic tank and the membrane unit so as to facilitate the separation of the biochemical region and the membrane unit;
the equipment room is equipped with in the equipment room and produces water pump 10, produces the water inlet of water pump and is connected to the membrane unit through first tube coupling, produces the water inlet of water pump and connects ultraviolet sterilizer.
Preferably, the anaerobic tank, the first-stage anoxic tank and the second-stage anoxic tank are all provided with stirrers 11.
Preferably, a blast aeration device 9 is further arranged in the equipment room, and the bottoms of the first-section aerobic tank, the second-section aerobic tank and the membrane unit are connected to the blast aeration device through second pipelines.
Preferably, a backwashing dosing pump is also arranged between the second-stage anoxic tank and the membrane unit.
Preferably, the terminal mud-water mixture that flows back to one section oxygen deficiency pond through the mud backwash pump of the box of membrane unit realizes the denitrification denitrogenation function, discharges the surplus sludge to storing up the mud pond through the pipeline branch regularly simultaneously.
Preferably, the membrane unit adopts an MBR membrane module, the filtering membrane of the MBR membrane module adopts an external pressure type hollow fiber curtain type membrane, and the MBR membrane module comprises a membrane pool pipe gallery and a push-pull cover plate.
Preferably, the water inlet end of the anaerobic tank is provided with a grating, and a hair filter is arranged in the grating.
Preferably, the stirrer adopts a hyperboloid vertical stirrer, the mixing effect is uniform, the hydraulic flow has no dead angle, and the operation effect is better than that of the traditional submersible stirrer.
Preferably, the blast aeration device adopts a rotary blower, and an air outlet of the rotary blower is divided into two pipelines which are respectively connected to the membrane area and the aeration system.
As shown in fig. 1-2, a sewage treatment apparatus includes: a movable box body, a biochemical unit, a membrane unit and an equipment room are arranged in the box body, wherein,
the biochemical unit comprises an anaerobic tank, a first-section anoxic tank, a first-section aerobic tank, a second-section anoxic tank and a second-section aerobic tank which are arranged according to requirements and are adjacently communicated, the second-section aerobic tank is communicated with the membrane unit, stirrers are arranged in the anaerobic tank, the first-section anoxic tank and the second-section anoxic tank, the bottoms of the first-section aerobic tank, the second-section aerobic tank and the membrane unit are connected through pipelines and are arranged in blast aeration of a device room, and a backwashing dosing pump is arranged between the second-section anoxic tank and the membrane unit;
still be provided with in the equipment room and produce the water pump, produce the water inlet of water pump and pass through pipe connection to membrane unit, produce the delivery port of water pump and carry the high-quality water of collecting to ultraviolet degassing unit and carry out disinfection treatment.
In use, the MBR membrane component is combined to fully utilize the high-efficiency interception function of the membrane, so that nitrifying bacteria can be effectively intercepted and completely retained in the bioreactor, the nitrification reaction is ensured to be carried out smoothly, ammonia nitrogen is effectively removed, the loss of sludge is avoided, macromolecular organic matters which are difficult to degrade temporarily can be intercepted, the retention time of the macromolecular organic matters in the reactor is prolonged, and the macromolecular organic matters are decomposed to the maximum extent;
the back end of the AAO process is added with an AO section, the removal effect of the total TN is further enhanced, and the COD of each section is greatly increased within the limited retention timecr、BOD5、NH3-N, TN removal;
the removal rate of main pollutants can be remarkably improved, the produced water suspended matters and turbidity are nearly zero, the treated water quality is good and stable, the treated water can be directly recycled, and the recycling of sewage is realized
In the implementation, the preferred, the agitator adopts hyperboloid vertical agitator in anaerobism pond, one section oxygen deficiency pond and the second grade oxygen deficiency pond, and the mixing effect is even, and hydraulic flow does not have the dead angle, and is better than traditional dive agitator operation effect.
Set up above-mentioned structure, hyperboloid vertical agitator, the mixing effect is even, and hydraulic flow does not have the dead angle, and is better than traditional dive agitator operation effect.
In the embodiment, the membrane unit is preferably an MBR membrane module, and the MBR membrane module comprises a membrane pool pipe gallery and a push-pull cover plate.
Set up above-mentioned structure, membrane pond piping lane and push-and-pull cover plate reasonable setting make things convenient for manual valve adjustment, and the membrane frame is convenient for hoist and mount and is overhauld.
In this embodiment, the filtration membrane of the MBR membrane module is preferably an external pressure type hollow fiber curtain membrane.
The structure is arranged, the membrane material is a polyvinylidene fluoride reinforced PVDF curtain type membrane component, the aperture of the membrane is less than 0.1um, the PH range is 2-12, and the working temperature is 12-45 ℃; the lower part of the MBR membrane component is provided with blast aeration to perform aeration and blowing on the surface of the membrane component so as to remove pollutants such as sludge attached to the surface of the membrane, reduce membrane yarn pollution and ensure the flux of the membrane.
In this embodiment, the water outlet end of the water generating pump is preferably connected with an ultraviolet sterilizer.
By adopting the structure, the quality of the output water of the water producing pump is improved, and secondary pollution is prevented.
In the present embodiment, a rotary blower is preferably used for the blast aeration.
Set up above-mentioned structure, centrifugal fan saves the occupation of land, and the air outlet temperature is low, can not increase indoor temperature summer, influences automatically controlled heat dissipation.
In this embodiment, the water inlet end of the anaerobic tank is preferably provided with a grating, and a hair filter is arranged in the grating.
The structure is arranged, and the hair filter is adopted to filter fibers and hair substances.
Phosphorus is often phosphate (H)2PO4－、HPO4 2－And PO4 3－) The biological phosphorus removal is to utilize bacteria such as phosphorus-accumulating bacteria to release phosphorus in an anaerobic state, absorb phosphorus from the outside in an aerobic state, store the phosphorus in a polymerized state in the body, form high-phosphorus sludge and discharge the high-phosphorus sludge out of a system, thereby achieving the effect of removing phosphorus from wastewater.
Biological phosphorus removal is mainly realized by discharging excess sludge, so that the excess sludge can affect the phosphorus removal effect, and a system with short sludge age can produce more excess sludge, so that higher phosphorus removal effect can be achieved. It is reported that the phosphorus removal rate is 40% when the sludge age is 30 days, 50% when the sludge age is 17 days, and 87% when the sludge age is reduced to 5 days.
A large number of experimental observation data have completely proved that in the biological phosphorus removal process, activated sludge which releases phosphate in an anaerobic manner has strong phosphorus absorption capacity in an aerobic state, that is, the anaerobic release of phosphorus is a precondition for aerobic phosphorus absorption and phosphorus removal, but the aerobic phosphorus absorption capacity of the sludge can not be enhanced by the anaerobic release of all phosphorus. The anaerobic release of phosphorus can be divided into two parts: the effective release refers to that the organic matters are absorbed into cells and stored in the cells while the phosphorus is released, namely the release of the phosphorus is a coupling process of an energy-consuming process of absorption and conversion of the organic matters. The ineffective release is not accompanied with the absorption and storage of organic matters, and the release of phosphorus caused by endogenous loss, pH change and toxic action belongs to the ineffective release.
In an anaerobic zone of a phosphorus removal (denitrification) system, after return sludge containing phosphorus-containing bacteria is mixed with sewage, effective release of phosphorus occurs in the initial stage, and after easily degradable organic matters in the sewage are consumed along with the prolonging of time, although the process of absorbing and storing the organic matters is basically stopped, microorganisms continuously decompose the phosphorus and release decomposition products (phosphorus) in order to maintain basic life activities, and although the total phosphorus release amount is continuously improved, the phosphorus absorption capacity generated by unit phosphorus release amount is reduced along with the increase of ineffective release amount. Generally, the sewage sludge mixture is anaerobic for 2hr, and the effective release of phosphorus is very slight. In the effective release process, the release amount of phosphorus and the conversion amount of organic matters have good correlation, in the effective release process, the anaerobic release of phosphorus can greatly improve the aerobic phosphorus uptake capacity of sludge, 1mgP is released in each anaerobic way, 2.0-2.4 mgP can be absorbed under the aerobic condition, the anaerobic time is prolonged, the ineffective release is gradually increased, and the aerobic phosphorus uptake capacity generated by the average anaerobic release of 1mgP is reduced to be below 1mgP and even reaches 0.5 mgP. Therefore, the biological phosphorus removal system is not as long as the anaerobic time is better, meanwhile, the impact of low pH is avoided as much as possible in operation management, otherwise, the phosphorus removal capability is greatly reduced and even completely lost, which is mainly because the pH is reduced to cause damage to the cell structure and function, and intracellular phosphorus accumulation is hydrolyzed under the acidic condition, so that the phosphorus is rapidly released.
In general, the hydraulic retention time of the anaerobic zone can meet the requirement of 1-1.5 h.
Anaerobic reaction tank
The main function of the anaerobic pool is biological phosphorus release. The biological phosphorus release is realized by utilizing the fact that phosphorus-accumulating bacteria in sewage are suppressed under the anaerobic condition to release phosphate in vivo, the activity is improved, energy is generated to absorb and rapidly degrade organic matters, and the organic matters are converted into PHB (poly-B-hydroxybutyrate) to be stored. When the phosphorus-accumulating bacteria enter aerobic conditions, PHB stored in the degradation body generates energy for synthesizing cells and excessively absorbing phosphorus dissolved in sewage to form sludge with high phosphorus content, and the sludge is discharged out of the system along with residual sludge, so that the aim of removing phosphorus is fulfilled.
Anoxic reaction tank
The anoxic reaction tank is used for decomposing various complex organic matters in the wastewater. The treatment process is a complex microbial chemical process, and organic matters are gradually decomposed into methane and carbon dioxide under the action of anoxic bacteria. NH generated by decomposition of nitrogen-containing organic substances during decomposition3Can also provide nutrients for microorganisms.
In the specific embodiment 1, the method comprises the following steps of,
the process equipment, the electric control system, the instrument, the valve, the pipeline and the like are not shown, and only the main water inlet pipeline, the power supply inlet wire, the tap water inlet pipeline, the sludge discharge pipeline and the emptying pipeline are in butt joint with the periphery.
Raw water is collected through a pipe network and enters a sewage station, and flows into an adjusting tank after large-particle suspended matters are removed through a mechanical grating. After the water quality and the water quantity are adjusted for a fixed time, the water is lifted to integrated equipment by a submerged pump in the pool, namely, residual short fibers and hair substances in the water are removed by a hair filter, and the phenomenon that the water is wound on the surface of a membrane wire to influence the operation is avoided; the integrated equipment sequentially flows through an anaerobic tank, an anoxic tank (one section), an aerobic tank (one section), an anoxic tank (two sections), an aerobic tank (two sections) and a membrane tank.
The inflow of each process section flows in and out by the gravity of water through the overflowing holes of the section partition plates. In the biochemical section AAO + AO, hyperboloid stirrers are arranged in the anaerobic tank and the anoxic tank to ensure that sewage is fully contacted with the sludge strain suspension tank, and the aerobic tank provides survival conditions for aerobic bacteria by virtue of oxygen supplied by a micropore aeration system at the bottom of the tank.
In the membrane separation area, the membrane unit is arranged in a membrane area and mainly used for solid-liquid separation to ensure that the whole biochemical tank keeps higher sludge concentration, and the perforated pipe is arranged on the membrane unit for aeration to mainly complete two functions, namely, gas-water oscillation cleaning of the membrane is carried out to keep the surface of the membrane clean, oxygen is provided for microorganisms, and water and small molecular substances in mixed liquid pass through an MBR membrane under the suction action of a pump to realize sludge-water separation.
The filtrate is collected to a clear water/backwash tank via an MBR header. By the high-efficiency interception function of the membrane, all bacteria and suspended matters are intercepted in the membrane area, meanwhile, the nitrifying bacteria can be effectively intercepted, so that the nitrification reaction is smoothly carried out, and NH3-N is effectively removed; meanwhile, macromolecular organic matters which are difficult to degrade can be intercepted, and the retention time of the macromolecular organic matters in the reactor is prolonged, so that the macromolecular organic matters are degraded to the maximum extent; the nitrifying liquid is fully refluxed to oxygen deficiency by depending on a reflux pump, so that efficient denitrification reaction is completed, and total nitrogen is effectively removed. The MBR membrane unit is installed in the pond, and the membrane lower part is provided with aeration equipment, sweeps and shakes the membrane silk to alleviate the peripheral mud accumulation of MBR membrane group.
The produced water is pumped by a water production pump and then is sent into an ultraviolet sterilizer, and after escherichia coli and other viruses are eliminated by ultraviolet lamp irradiation, the produced water flows into a water production pool and overflows to discharge water at a high liquid level. The sludge in the system is discharged to a sludge storage tank through a membrane bottom discharge valve, so that the concentration and activity of the activated sludge in the system can be controlled.
Meanwhile, in order to ensure that the MBR membrane component has good water flux and can continuously and stably discharge water, the system is provided with a clear water backwashing program, a chemical backwashing program and a chemical soaking cleaning program to clean the membrane at regular time.
The cleaning system comprises a cleaning tank, a backwashing pump, a metering pump, an acid pump, an alkali pump, a fixed pipeline connected with a water production system, a joint, an automatic control valve and the like.
And secondly, cleaning the MBR device by taking the module as a unit according to a certain period (which can be adjusted according to the operation condition) so as to recover the water flux of the membrane.
And (4) clear water backwashing, namely automatically backwashing in sequence by taking the assembly as a unit according to a certain period (which can be adjusted according to the operation condition) so as to recover the water flux of the membrane. And in the backwashing process, clear water is pumped into the hollow fiber membrane by a backwashing pump to carry out reverse cleaning.
Chemical backwashing: and (3) carrying out chemical backwashing after the MBR runs for a week, wherein the chemical backwashing process is similar to that of clear water backwashing, and only the cleaning liquid medicine is added into a backwashing water pipe by a citric acid/hydrochloric acid dosing pump or a sodium hypochlorite dosing pump respectively. The citric acid helps to remove inorganic foulants attached to the membrane, and the sodium hypochlorite helps to remove organic attachments.
Chemical dipping and cleaning: the membrane module is thoroughly cleaned after the MBR is operated for about 3 months to half a year (the specific time is determined according to the quality of inlet water and the operation condition of equipment).
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A high-performance MBR combined process is characterized by comprising the following steps:
s1: the raw water is collected by a pipe network and then is subjected to primary deslagging treatment to enter an adjusting tank, the adjusting tank is used for adjusting the water quality and the water quantity and the PH value for a fixed time, and a submersible pump in the adjusting tank lifts the sewage to an anaerobic tank in the combined device;
s2: the anaerobic tank and the first-stage anoxic tank carry out biological phosphorus release on the sewage and then enter the first-stage aerobic tank,
wherein, the phosphorus accumulating bacteria in the sewage is inhibited under anaerobic and anoxic conditions to release phosphate in the body and then quickly degrade organic matters, the phosphate is converted into poly-B-hydroxybutyrate, the phosphorus accumulating bacteria enters a section of aerobic tank and then degrades the poly-B-hydroxybutyrate stored in the body to generate energy for synthesizing cells and excessively absorbing the phosphorus dissolved in the sewage,
the first-stage anoxic tank performs denitrification TN removal on the sewage;
s3: the sewage in the first-section aerobic tank enters a second-section anoxic tank to complete secondary denitrification and COD removal;
s4: the sewage flows into a second-section aerobic tank, the second-section aerobic tank provides survival conditions for aerobic bacteria by virtue of oxygen supplied by a micropore aeration system at the bottom of the tank, the second-section aerobic tank is communicated with the membrane unit, and a stop valve is arranged between the second-section aerobic tank and the membrane unit so as to facilitate the separation of a biochemical region and the membrane region;
s5: and the membrane unit is cleaned at regular time by using procedures of clear water backwashing, chemical backwashing and chemical soaking cleaning until the membrane unit can continuously and stably discharge water.
2. A sewage treatment apparatus, comprising: a plurality of mobile boxes, wherein a biochemical unit, a membrane unit and an equipment room are arranged in each mobile box,
the biochemical unit comprises an anaerobic tank, a first-section anoxic tank, a first-section aerobic tank, a second-section anoxic tank and a second-section aerobic tank which are sequentially communicated;
the two sections of aerobic tanks are communicated with the membrane unit, and a stop valve is arranged between the two sections of aerobic tanks and the membrane unit so as to facilitate the separation of the biochemical unit and the membrane unit;
the device room is internally provided with a water production pump, a water inlet of the water production pump is connected to the membrane unit through a first pipeline, and a water outlet of the water production pump is connected with the ultraviolet sterilizer.
3. The wastewater treatment apparatus according to claim 2, wherein agitators are installed in the anaerobic tank, the first stage anoxic tank and the second stage anoxic tank.
4. The sewage treatment device according to claim 2, wherein a blast aeration device is further arranged in the plant room, and the bottoms of the first section aerobic tank, the second section aerobic tank and the membrane unit are all connected to the blast aeration device through a second pipeline.
5. The sewage treatment device of claim 2, wherein a backwashing dosing pump is further arranged between the second-stage anoxic tank and the membrane unit.
6. The sewage treatment device according to claim 2, wherein the sludge-water mixed liquid is returned to the first-stage anoxic tank from the tail end of the tank body of the membrane unit through a sludge return pump, so that the denitrification function is realized, and meanwhile, the residual sludge is periodically discharged to the sludge storage tank through the pipeline branch.
7. The sewage treatment device of claim 2, wherein the membrane unit adopts an MBR membrane module, the filtering membrane of the MBR membrane module adopts an external pressure type hollow fiber curtain membrane, and the MBR membrane module comprises a membrane pool pipe gallery and a push-pull cover plate.
8. The wastewater treatment device according to claim 2, wherein the water inlet end of the anaerobic tank is provided with a grating, and a hair filter is arranged in the grating.
9. The wastewater treatment device according to claim 3, wherein the stirrer is a hyperboloid vertical stirrer.
10. The wastewater treatment apparatus according to claim 4, wherein the blast aeration apparatus is a rotary blower.
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| CN116253476A (en) * | 2023-04-19 | 2023-06-13 | 河南中烟工业有限责任公司 | Recycling treatment system and treatment process for tobacco industry wastewater |
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| CN207091231U (en) * | 2017-06-27 | 2018-03-13 | 天津海派特环保科技有限公司 | A kind of MBR integrated sewage treating apparatus |
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