CN106315853B - Oxidation ditch membrane bioreactor and sewage treatment process and application thereof - Google Patents

Oxidation ditch membrane bioreactor and sewage treatment process and application thereof Download PDF

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CN106315853B
CN106315853B CN201610896006.0A CN201610896006A CN106315853B CN 106315853 B CN106315853 B CN 106315853B CN 201610896006 A CN201610896006 A CN 201610896006A CN 106315853 B CN106315853 B CN 106315853B
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oxidation ditch
membrane
membrane bioreactor
biological reaction
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CN106315853A (en
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商佳吉
薛艳
张大鹏
贺韡婧
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Shanghai Purification Technology Complete Equipment Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/301Aerobic and anaerobic treatment in the same reactor
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/308Biological phosphorus removal
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/04Flow arrangements
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

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  • Biodiversity & Conservation Biology (AREA)
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  • Molecular Biology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention provides an oxidation ditch membrane bioreactor and a sewage treatment process and application thereof, wherein an oxidation ditch is arranged in the oxidation ditch membrane bioreactor, the oxidation ditch membrane bioreactor comprises an anoxic zone and an aerobic zone which are continuously arranged or comprises an anaerobic zone, an anoxic zone and an aerobic zone which are continuously arranged, one or more membrane biological reaction zones are arranged in the aerobic zone, a sewage water inlet is arranged in the anoxic zone or the anaerobic zone, the membrane bioreactor and the oxidation ditch are organically combined, the advantages of S-MBR and R-MBR are fully exerted, sludge backflow is reduced or cancelled, and the process flow and power equipment are simplified; the cleaning solution is operated as S-MBR to realize in-situ online cleaning and soaking cleaning; the system operates as an R-MBR, so that the land utilization rate is improved, and the operation and maintenance are simple; an aeration system is optimized, and pulse aeration is combined, so that the effective oxygen demand in each area is ensured, and the energy consumption is avoided. The invention enhances the treatment effect of nitrogen and phosphorus removal, saves energy consumption and saves occupied area by optimally combining the reactors.

Description

Oxidation ditch membrane bioreactor and sewage treatment process and application thereof
Technical Field
The invention relates to the technical field of biochemical sewage biological treatment and recycling processes, in particular to an oxidation ditch membrane bioreactor and a sewage treatment process and application thereof.
Background
The membrane bioreactor (membrane biological reactor) is suitable for treating and recycling urban sewage and biochemical industrial wastewater, is a novel high-efficiency sewage treatment process organically combining a membrane separation technology and a traditional sewage biological treatment process, and is a sewage treatment process which takes a membrane as a separation medium to replace conventional gravity precipitation solid-liquid separation to obtain effluent, can change a reaction process and improve reaction efficiency, and is called MBR for short.
The MBR process has high microorganism concentration, large treatment capacity load of a device, land occupation saving, good effluent quality and direct reuse, and the later process does not need a sedimentation tank, so the MBR process has obvious advantages and wide development prospect in projects with high effluent discharge standard requirements, need of reuse or short engineering land.
MBR processes are classified into submerged (also called integrated) and external (also called split) membrane biological treatment systems according to the relative position classification of a membrane group device and a bioreactor. An Immersed membrane biological treatment system (S-MBR) refers to a device or system in which a membrane group device is Immersed in a biological reaction tank, pollutants are subjected to biochemical reaction in the biological reaction tank, and solid-liquid separation is performed by using a membrane. The water can be produced by negative pressure or by hydrostatic pressure. An external membrane biological treatment system (simply stream membrane biological treatment system), referred to as R-MBR for short, means that a membrane group device and a biological reaction tank are separately arranged, and activated sludge mixed liquor in the biological reaction tank is pumped into the membrane group device for solid-liquid separation. And (4) discharging or deeply treating produced water, and refluxing the concentrated mud-water mixture to a circulating concentration tank or a biological reaction tank to form circulation.
The S-MBR process has compact structure, saves space, and has treatment scale less than 1000m 3 The in-situ cleaning can be adopted during the treatment of the wastewater with the treatment scale of more than 1000m 3 In/h, the original biological treatment system is damaged due to in-situ cleaning, and off-line cleaning is required. The offline cleaning unit has high equipment investment and complex operation and maintenance. Meanwhile, the problems of membrane blockage and membrane pollution are more obvious because the flow state of the membrane surface is stable.
The R-MBR process membrane group device is independent, simple in control mode and convenient to clean, but occupies a large area and has high energy consumption.
With the increasing of sewage discharge standard, urban construction land is more tense, the application demand of MBR is rapidly increased, and the main reasons for hindering the operation and popularization of MBR process are the higher energy consumption than the traditional process and the related problems of membrane pollution. Currently, most research focuses on these two issues. One of the main research directions is to optimize the operation and maintenance mode and reduce the energy consumption and the operation cost by organically combining the MBR process and other processes.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an oxidation ditch membrane bioreactor, a sewage treatment process and application thereof, wherein an oxidation ditch is arranged in the oxidation ditch membrane bioreactor, the oxidation ditch membrane bioreactor comprises an anoxic zone and an aerobic zone which are continuously arranged or comprises an anaerobic zone, an anoxic zone and an aerobic zone which are continuously arranged, one or more membrane biological reaction zones are arranged in the aerobic zone, a sewage water inlet is arranged in the anoxic zone or the anaerobic zone, a membrane bioreactor and the oxidation ditch are organically combined, the advantages of S-MBR and R-MBR are fully exerted, and compared with the traditional activated sludge method and the traditional membrane bioreactor: the sludge backflow is reduced or cancelled, and the process flow and power equipment are simplified; the cleaning solution is operated as an S-MBR to realize in-situ online cleaning and soaking cleaning; the system operates as an R-MBR, so that the land utilization rate is improved, and the operation and maintenance are simple; an aeration system is optimized, and pulse aeration is combined, so that the effective oxygen demand in each area is ensured, and the energy consumption is avoided. The invention enhances the treatment effect of nitrogen and phosphorus removal of a biochemical system, saves energy consumption and land occupation, and reduces the capital investment and the operation cost through the optimized combination of the reactors.
The invention is realized by the following technical scheme:
the invention provides an oxidation ditch membrane bioreactor, wherein an oxidation ditch is arranged in the oxidation ditch membrane bioreactor, the oxidation ditch membrane bioreactor comprises an anoxic zone and an aerobic zone which are continuously arranged or comprises an anaerobic zone, an anoxic zone and an aerobic zone which are continuously arranged, one or more membrane biological reaction zones are arranged in the aerobic zone, and a sewage water inlet is arranged in the anoxic zone or the anaerobic zone.
Preferably, the oxidation ditch is in a gallery type, and the oxidation ditch membrane bioreactor comprises one oxidation ditch or a plurality of oxidation ditches connected in series.
More preferably, the oxidation ditch is formed by dividing the flow guide walls and comprises one or more galleries.
Even more preferably, the guide walls include intermediate walls and/or arc-shaped guide walls.
Still further more preferably, the arc-shaped guide wall is provided at a free end of the intermediate partition wall.
Preferably, a partition wall is arranged between the anaerobic zone and the anoxic zone.
Preferably, any one or more of the following features are also included:
1) The oxidation ditch membrane bioreactor is provided with one or more membrane biological reaction zone groups, each membrane biological reaction zone group consists of one or more membrane biological reaction zones connected in parallel, and when the membrane biological reaction zone groups are multiple, the multiple membrane biological reaction zone groups are arranged in the aerobic zone in series;
2) Each membrane biological reaction zone is provided with a membrane zone water distribution weir gate and a membrane zone water outlet weir gate;
3) A plurality of guide plates are arranged in each membrane biological reaction zone, and the guide plates are staggered up and down in each membrane biological reaction zone;
4) Each membrane biological reaction zone is internally provided with a membrane component;
5) A push-flow type submersible stirrer is arranged in the anaerobic zone, the anoxic zone and the aerobic zone;
6) And aeration devices are arranged in the anoxic zone and the aerobic zone.
The second aspect of the invention provides the use of the oxidation ditch membrane bioreactor for treating sewage.
The third aspect of the present invention provides a wastewater treatment process using the oxidation ditch membrane bioreactor, wherein the wastewater treatment process is selected from any one of the following wastewater treatment processes of oxidation ditch membrane bioreactors:
the first oxidation ditch membrane bioreactor sewage treatment process comprises the following steps:
the sewage firstly enters an anoxic zone and is mixed with reflux liquid from an aerobic zone, denitrification is carried out in the anoxic zone in a denitrification process, and partial organic matters are degraded and removed under the action of denitrifying bacteria;
then enters an aerobic zone and a membrane biological reaction zone arranged in the aerobic zone to carry out further degradation of organic matters and nitration of ammonia, and then enters an anoxic zone to circularly flow in an oxidation ditch; the treated water is discharged from the membrane biological reaction zone through a pump;
and a second oxidation ditch membrane bioreactor sewage treatment process comprises the following steps:
the sewage firstly enters an anaerobic zone and is mixed with reflux liquid from an aerobic zone, phosphorus releasing is carried out on phosphorus-accumulating bacteria in the anaerobic zone under an anaerobic environment, organic pollutants which are easy to degrade are converted, and part of nitrogenous organic matters are aminated;
then the wastewater enters an anoxic zone and is mixed with reflux liquid from an aerobic zone, denitrification is carried out in the anoxic zone in a denitrification process, and partial organic matters are degraded and removed under the action of denitrifying bacteria;
then enters an aerobic zone and a membrane bioreaction zone arranged in the aerobic zone to further degrade organic matters, nitrify ammonia and absorb phosphorus; the treated water is discharged from the membrane biological reaction zone through a pump.
Preferably, any one or more of the following features are also included:
the concentration of dissolved oxygen in the anoxic zone is less than 0.5mg/L, the hydraulic retention time is 0.5-3 h, and the total nitrogen load rate is less than or equal to 0.05 kgTN/(kgMLSS. D);
the dissolved oxygen concentration in the aerobic zone is more than 2mg/L, BOD 5 The sludge load is 0.1-0.2 kgBOD 5 (kgMLSS. D), the sludge concentration is 2.5-4.5 g/L;
the membrane biological reaction zone adopts a pulse type aeration online cleaning mode;
the air-water ratio of the membrane biological reaction area is 4-6, and the air-water ratio of the pulse aeration is 12-16.
Preferably, the concentration of dissolved oxygen in the anaerobic zone is less than 0.2mg/L, and the hydraulic retention time is 1-2 h.
The sewage treatment process of the oxidation ditch membrane bioreactor is used for removing organic matters in sewage, removing nitrogen and phosphorus, and makes a contribution to the construction of a resource-saving and environment-friendly society. The invention arranges the membrane biological reaction zone in the oxidation ditch, adopts a continuous operation mode, combines the advantages and the disadvantages of S-MBR and R-MBR, and gives full play to the advantages of different types.
The oxidation ditch-MBR reactor is divided into an anoxic/aerobic zone by taking denitrification as a main treatment target; the method takes simultaneous denitrification and dephosphorization as main treatment targets and is divided into an anaerobic/anoxic/aerobic area. Stirring and aerating according to the process requirements of different sections. All the working sections are connected with each other, the pool-type structure and the hydraulic design ensure that the complete mixing and plug flow type are simultaneously realized in the oxidation ditch, and water flow continuously circulates and is instantly mixed in the whole pool body.
Set up the guide wall in the oxidation ditch and dive the agitator, promote upper and lower floor vertical mixing in the pond, avoid the velocity of flow layering, do benefit to improve velocity of flow distribution in the pond, prevent sludge deposition.
The aeration energy consumption is the largest energy consumption link in sewage treatment engineering and conventional treatment processes, and is also an important link for energy conservation. By optimizing the aeration system, the energy consumption is reduced: (1) automatic on-line control and accurate aeration are carried out; (2) discontinuous aeration; (3) improving the pool structure and the aeration equipment.
Blast aeration is adopted in the oxidation ditch, and a micropore aeration device is selected to ensure the oxygen amount required by the process.
The MBR is arranged on the aerobic section of the oxidation ditch, and the water inlet and outlet states of the MBR are controlled by adjusting the weir gate. The tank is internally provided with a perforated pipe, and pulse aeration is carried out through program automatic control. The air quantity is periodically changed, the low air quantity meets the oxygen quantity required by the MBR process, and the ineffective aeration is reduced; when the air flow is high, the strong air flow is stirred to form a cross flow on the membrane surface, so that shearing force and disturbing force are generated, macromolecules such as biological aggregates are separated from the membrane surface, and sludge is prevented from depositing on the membrane assembly device.
MBR groups are arranged in parallel, and are cleaned regularly according to the process running condition. Compared with the S-MBR, the method can adopt in-situ cleaning under various design scales, does not influence the operation of other MBR units, and does not destroy formed biological groups and biological systems. Compared with the R-MBR, the cleaning system has the advantages of reducing mechanical equipment matched with the cleaning system, saving investment and operation cost and being convenient to maintain.
The oxidation ditch membrane bioreactor and the sewage treatment process thereof have at least one of the following beneficial effects:
1) The water flow in the oxidation ditch membrane bioreactor is in a completely mixed and plug-flow state, and is continuously circulated, so that the denitrification and dephosphorization process repeatedly occurs, and the sewage treatment effect is improved;
2) The oxidation ditch and the MBR process are organically combined, so that the sludge reflux ratio can be reduced, or the sludge reflux is cancelled, compared with the traditional membrane bioreactor, the process flow is short, the cost of a mixed liquid lifting pump and a lifting pipeline is reduced, and the power energy consumption is low;
3) The oxidation ditch membrane bioreactor organically combines the technical advantages of S-MBR and R-MBR, saves land, reduces electromechanical equipment, is simple to operate and reduces energy consumption;
4) On the premise of ensuring the oxygen demand of normal reaction and meeting the air quantity required by membrane surface scrubbing, the membrane area adopts pulse aeration to reduce the air-water ratio, compared with an equivalent aeration mode, the membrane area is distributed according to the requirement, thereby avoiding the surplus energy consumption and simultaneously eliminating the problems of membrane blockage and the like caused by insufficient air quantity;
5) The membrane biological reaction zone adopts pulse aeration, the aeration rate is controlled in the most economic range, the aeration is effective, the influence on the living environment of an anoxic zone due to overhigh dissolved oxygen in the complete mixing process is avoided, and the denitrification process is inhibited; or influence the living environment of the anaerobic zone and inhibit the dephosphorization process;
6) The dissolved oxygen concentration of the aerobic zone and the membrane biological reaction is controlled, the excessive degradation of organic matters is avoided while the nitrification is carried out, so that the organic matters in the anoxic zone and the anaerobic zone are low in content, nitrate nitrogen cannot be completely removed, the phosphorus release of phosphorus accumulating bacteria and the synthesis of PHB (polyhydroxybutyrate) are inhibited, and the thorough degree of phosphorus release influences the absorption of phosphorus in the aerobic section, thereby influencing the denitrification and dephosphorization effect;
7) The membrane bioreactor and the oxidation ditch are organically combined, the advantages of the S-MBR and the R-MBR are fully exerted, the S-MBR is operated as the S-MBR, in-situ online cleaning and soaking cleaning are realized, electromechanical equipment is reduced, and the maintenance and the operation are simple; the system operates as an R-MBR, so that the land utilization rate is improved, and the operation and maintenance are simple;
8) The membrane biological reaction zone is arranged in the oxidation ditch, has the characteristic of S-MBR, saves space and is convenient to operate;
9) The membrane biological reaction zone adopts pulse aeration, so that the economic and reasonable aeration quantity is designed, the effective utilization rate of aeration is improved, and the energy consumption is saved;
10 The internal reflux mode is flexible, the implementation is realized by adopting circulating flow hydraulic pushing flow, the capital construction investment and the operation energy consumption are saved, the water flow in the tank is repeatedly circulated, the sludge forms continuous circulation along with the water flow, the sludge reflux of the membrane area is realized, and the reflux of the mixed liquid of the anaerobic area and the anoxic area is realized;
11 The guide plates are arranged in the membrane biological reaction area in a vertically staggered manner to form vertically convoluted water flow, so that the scouring strength of the water flow to membrane filaments is weakened, the service life of the membrane filaments is prolonged, and the membrane biological reaction area is suitable for various types of membrane filaments.
Drawings
FIG. 1 is a schematic top view showing the structure of an oxidation ditch membrane bioreactor in example 1.
FIG. 2 is a schematic top view of the oxidation ditch membrane bioreactor in example 2.
FIG. 3 is a schematic top view showing the structure of an oxidation ditch membrane bioreactor according to example 3.
Description of the drawings:
1-an anoxic zone; 2-an aerobic zone; 3-a membrane biological reaction zone; 4-an anaerobic zone; 5-an intermediate partition wall; 6-arc guide wall; 7-partition wall; 8-water weir gate is arranged in the membrane area; 9-membrane area water outlet weir gate; 10-push flow type submersible mixer.
Detailed Description
The technical solution of the present invention is illustrated by specific examples below. It is to be understood that one or more method steps recited herein do not preclude the presence of additional method steps before or after the recited combining step or that additional method steps can be inserted between the explicitly recited steps; it should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the method steps is only a convenient tool for identifying each method step, and is not intended to limit the order of the method steps or the scope of the invention, and changes or modifications in the relative relationship thereof may be regarded as the scope of the invention without substantial change in the technical content.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.
The invention is further described in the following with reference to the accompanying drawings and the detailed description.
Example 1
Oxidation ditch membrane bioreactor
As shown in figure 1, an oxidation ditch is arranged in the oxidation ditch membrane bioreactor, the oxidation ditch membrane bioreactor comprises an anaerobic zone 4, an anoxic zone 1 and an aerobic zone 2 which are continuously arranged, four membrane biological reaction zones 3 are arranged in the aerobic zone 2, and a sewage inlet is arranged in the anaerobic zone 4.
The oxidation ditch is the corridor formula, oxidation ditch membrane bioreactor includes the oxidation ditch of two concatenations.
The oxidation ditch is formed by being separated by the guide wall, and comprises a plurality of galleries.
The guide walls comprise intermediate partition walls 5 and/or arc-shaped guide walls 6.
The arc guide wall 6 is arranged at the free end of the intermediate partition wall 5.
A partition wall 7 is arranged between the anaerobic zone 4 and the anoxic zone 1.
The oxidation ditch membrane bioreactor is provided with two membrane biological reaction zone groups, each membrane biological reaction zone group consists of two membrane biological reaction zones which are connected in parallel, and the two membrane biological reaction zone groups are arranged in the aerobic zone 2 in series; each membrane biological reaction zone 3 is provided with a membrane zone water distribution weir gate 8 and a membrane zone water outlet weir gate 9; a plurality of guide plates are arranged in each membrane biological reaction zone 3, and the guide plates are staggered up and down in each membrane biological reaction zone 3; each membrane biological reaction zone 3 is internally provided with a membrane component.
And a push-flow type submersible stirrer 10 is arranged in the anaerobic zone, the anoxic zone and the aerobic zone.
And aeration devices are arranged in the anoxic zone and the aerobic zone.
Sewage treatment process for oxidation ditch membrane bioreactor
The oxidation ditch membrane bioreactor shown in figure 1 is adopted for sewage treatment and comprises the following steps:
sewage firstly enters an anaerobic zone and is mixed with reflux liquid from an aerobic zone, phosphorus is released by phosphorus accumulating bacteria in the anaerobic zone in an anaerobic environment, easily degradable organic pollutants are converted, part of nitrogenous organic matters are aminated, the dissolved oxygen concentration of the anaerobic zone is less than 0.2mg/L, the corresponding ORP value is-300 to-400 mV, and the hydraulic retention time is 1.5 hours;
then the wastewater enters an anoxic zone and is mixed with reflux liquid from the aerobic zone, denitrification is carried out in the anoxic zone, part of organic matters are degraded and removed under the action of denitrifying bacteria, the dissolved oxygen concentration of the anoxic zone is 0.5mg/L, the hydraulic retention time is 3h, the total nitrogen load rate is 0.009 kgTN/(kgMLSS.d), and the sludge concentration is 4.5g/L;
then enters an aerobic zone and a membrane biological reaction zone arranged in the aerobic zone to carry out further degradation of organic matters, nitrification of ammonia and absorption of phosphorus, wherein the dissolved oxygen concentration of the aerobic zone is 2mg/L, and BOD 5 The sludge load is 0.032kgBOD 5 /(kgMLSS. D), sludge concentration 4.5g/L, blast micro-hole aeration, air supply 3.16m 3 Air/m 3 In the sewage, the concentration of dissolved oxygen in the membrane biological reaction zone is 2mg/L, the concentration of sludge is 10g/L, the membrane biological reaction zone is pulse aeration, and a reinforced hollow fiber membrane is adopted. (the relevant parameters of the film vary with the selected brand product properties).
Sewage flows back to the anaerobic zone and the anoxic zone through circulation hydraulic plug flow respectively, an independent internal reflux device is not needed, continuous circulation of sewage in the tank can be realized, water flow is in a plug flow state and is in a completely mixed state in the whole reaction tank, instantaneous mixing is realized at each position, and the sewage concentration and the sludge concentration are basically the same. The membrane biological reaction zone is arranged in the aerobic zone, water flows through the membrane biological reaction zone and finally water is discharged, and the discharged water can be pumped out.
The mixed liquor in the aerobic zone flows back to the anoxic zone through the first mixed liquor backflow channel, and the mixed liquor in the aerobic zone flows back to the anaerobic zone through the second mixed liquor backflow channel.
The effect of the treated sewage is shown in table 1.
Water quality index (mg/L) COD Cr BOD 5 SS NH 3 -N TN TP
Quality of inlet water 400 150 100 35 50 5
Quality of effluent water 30 6 5 3 10 0.5
Example 2
Oxidation ditch film bioreactor
As shown in fig. 2, an oxidation ditch is arranged in the oxidation ditch membrane bioreactor, the oxidation ditch membrane bioreactor comprises an anoxic zone 1 and an aerobic zone 2 which are continuously arranged, four membrane biological reaction zones 3 are arranged in the aerobic zone 2, and the sewage inlet is arranged in the anoxic zone 1.
The oxidation ditch is of a gallery type, and the oxidation ditch membrane bioreactor comprises two oxidation ditches connected in series.
The oxidation ditch is formed by dividing a guide wall and comprises a plurality of galleries.
The guide walls comprise intermediate walls 5 and/or arc-shaped guide walls 6.
The arc-shaped guide wall 6 is arranged at the free end of the middle partition wall 5.
The oxidation ditch membrane bioreactor is provided with two membrane biological reaction zone groups, each membrane biological reaction zone group consists of two membrane biological reaction zones which are connected in parallel, and the two membrane biological reaction zone groups are connected in series and arranged in the aerobic zone 2; each membrane biological reaction zone 3 is provided with a membrane zone water distribution weir gate 8 and a membrane zone water outlet weir gate 9; a plurality of guide plates are arranged in each membrane biological reaction zone 3, and the guide plates are staggered up and down in each membrane biological reaction zone 3; each membrane biological reaction zone 3 is internally provided with a membrane component.
And a push-flow type submersible stirrer 10 is arranged in the anoxic zone and the aerobic zone.
And aeration devices are arranged in the anoxic zone and the aerobic zone.
Sewage treatment process of oxidation ditch membrane bioreactor
The oxidation ditch membrane bioreactor shown in figure 2 is adopted for sewage treatment and comprises the following steps:
the sewage firstly enters an anoxic zone and is mixed with reflux liquid from an aerobic zone, denitrification is carried out in the anoxic zone, part of organic matters are degraded and removed under the action of denitrifying bacteria, the dissolved oxygen concentration of the anoxic zone is 0.5mg/L, the hydraulic retention time is 2.5h, the total nitrogen load rate is 0.010 kgTN/(kgMLSS.d), and the sludge concentration is 4.5g/L;
then enters an aerobic zone and a membrane biological reaction zone arranged in the aerobic zone to further degrade organic mattersAnd nitrification of ammonia, the dissolved oxygen concentration in the aerobic zone being 2mg/L, BOD 5 The sludge load is 0.042kgBOD 5 /(kgMLSS. D), sludge concentration 4.5g/L, blast aeration with supply of 3.35m 3 Air/m 3 In the sewage treatment system, the dissolved oxygen concentration of the membrane biological reaction zone is 2mg/L, the sludge concentration is 10g/L, the membrane biological reaction zone is pulse aeration, and a reinforced hollow fiber membrane is adopted. (the relevant parameters of the film vary with the selected brand product properties).
Sewage pushes away the flow through circulation water conservancy and flows back to anaerobic zone and anoxic zone respectively, does not need solitary internal reflux unit, can realize that sewage constantly circulates in the pond, and rivers are not only pushing away the flow state in whole reaction tank, are the complete mixing state again, and in every position, instantaneous mixture, sewage concentration, mud concentration are the same basically. The membrane biological reaction zone is arranged in the aerobic zone, and water flows through the membrane biological reaction zone and finally flows out.
The effect of the treated sewage is shown in table 2.
Water quality index (mg/L) COD Cr BOD 5 SS NH 3 -N TN
Quality of inlet water 400 200 100 45 60
Quality of effluent water 50 10 10 5 15
Example 3
Oxidation ditch film bioreactor
As shown in figure 3, an oxidation ditch is arranged in the oxidation ditch membrane bioreactor, the oxidation ditch membrane bioreactor comprises an anaerobic zone 4, an anoxic zone 1 and an aerobic zone 2 which are continuously arranged, four membrane biological reaction zones 3 are arranged in the aerobic zone 2, and a sewage inlet is arranged in the anaerobic zone 4.
The oxidation ditch is of a gallery type, and the oxidation ditch membrane bioreactor comprises three oxidation ditches connected in series.
The oxidation ditch is formed by being separated by the guide wall, and comprises a plurality of galleries.
The guide walls comprise intermediate walls 5 and/or arc-shaped guide walls 6.
The arc-shaped guide wall 6 is arranged at the free end of the middle partition wall 5.
A partition wall 7 is arranged between the anaerobic zone 4 and the anoxic zone 1.
The oxidation ditch membrane bioreactor is provided with two membrane biological reaction zone groups, each membrane biological reaction zone group consists of two membrane biological reaction zones which are connected in parallel, and the two membrane biological reaction zone groups are connected in series and arranged in the aerobic zone 2; each membrane biological reaction zone 3 is provided with a membrane zone water distribution weir gate 8 and a membrane zone water outlet weir gate 9; a plurality of guide plates are arranged in each membrane biological reaction zone 3, and the guide plates are staggered up and down in each membrane biological reaction zone 3; each membrane biological reaction zone 3 is internally provided with a membrane component.
And a push-flow type submersible stirrer 10 is arranged in the anaerobic zone, the anoxic zone and the aerobic zone.
And aeration devices are arranged in the anoxic zone and the aerobic zone.
Sewage treatment process for oxidation ditch membrane bioreactor
The oxidation ditch membrane bioreactor shown in figure 3 is adopted for sewage treatment and comprises the following steps:
the sewage firstly enters an anaerobic zone and is mixed with reflux liquid from an aerobic zone, phosphorus releasing by phosphorus accumulating bacteria in the anaerobic zone is carried out in an anaerobic environment, meanwhile, organic pollutants which are easy to degrade are converted, and part of nitrogenous organic matters are aminated, the dissolved oxygen concentration of the anaerobic zone is less than 0.2mg/L, the corresponding ORP value is-300-400 mV, and the hydraulic retention time is 1.5h;
then the wastewater enters an anoxic zone and is mixed with reflux liquid from the aerobic zone, denitrification is carried out in the anoxic zone, part of organic matters are degraded and removed under the action of denitrifying bacteria, the dissolved oxygen concentration of the anoxic zone is 0.5mg/L, the hydraulic retention time is 2.5h, the total nitrogen load rate is 0.007 kgTN/(kgMLSS.d), and the sludge concentration is 4.5g/L;
then enters an aerobic zone and a membrane biological reaction zone arranged in the aerobic zone for further degradation of organic matters, nitrification of ammonia and absorption of phosphorus, wherein the dissolved oxygen concentration of the aerobic zone is 2mg/L, BOD 5 The sludge load is 0.042kgBOD 5 /(kgMLSS. D), sludge concentration 4.5g/L, blast micro-hole aeration, air supply 4.19m 3 Air/m 3 In the sewage treatment system, the dissolved oxygen concentration of the membrane biological reaction zone is 2mg/L, the sludge concentration is 10g/L, the membrane biological reaction zone is pulse aeration, and a reinforced hollow fiber membrane is adopted. (the relevant parameters of the film vary with the selected brand product properties).
Sewage flows back to the anaerobic zone and the anoxic zone through circulation hydraulic plug flow respectively, an independent internal reflux device is not needed, continuous circulation of sewage in the tank can be realized, water flow is in a plug flow state and is in a completely mixed state in the whole reaction tank, instantaneous mixing is realized at each position, and the sewage concentration and the sludge concentration are basically the same. The membrane biological reaction zone is arranged in the aerobic zone, and water flows through the membrane biological reaction zone and finally flows out.
The effect of the treated sewage is shown in table 3.
Water quality index (mg/L) COD Cr BOD 5 SS NH 3 -N TN TP
Quality of inlet water 450 200 100 30 45 5
Quality of effluent water 50 10 10 5 15 0.5
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (9)

1. An oxidation ditch membrane bioreactor sewage treatment process is characterized by being selected from any one of the following oxidation ditch membrane bioreactor sewage treatment processes:
the first oxidation ditch membrane bioreactor sewage treatment process comprises the following steps:
1) The sewage firstly enters an anoxic zone and is mixed with reflux liquid from an aerobic zone, denitrification is carried out in the anoxic zone in a denitrification process, and partial organic matters are degraded and removed under the action of denitrifying bacteria;
2) Then enters an aerobic zone and a membrane biological reaction zone arranged in the aerobic zone to carry out further degradation of organic matters and nitration of ammonia, and then enters an anoxic zone to circularly flow in an oxidation ditch; discharging the treated water from the membrane biological reaction zone;
the first oxidation ditch membrane bioreactor sewage treatment process adopts a first oxidation ditch membrane bioreactor to perform sewage treatment, an oxidation ditch is arranged in the first oxidation ditch membrane bioreactor, the first oxidation ditch membrane bioreactor comprises an anoxic zone (1) and an aerobic zone (2) which are continuously arranged, one or more membrane biological reaction zones (3) are arranged in the aerobic zone (2), and a sewage inlet is formed in the anoxic zone (1);
the oxidation ditch is in a gallery type, and the oxidation ditch membrane bioreactor comprises a plurality of oxidation ditches connected in series; the oxidation ditch is formed by dividing a guide wall and comprises a plurality of galleries; the guide wall comprises a middle partition wall (5) and an arc-shaped guide wall (6); the arc-shaped guide wall (6) is arranged at the free end of the middle partition wall (5);
the oxidation ditch membrane bioreactor is provided with one or more membrane biological reaction zone groups, each membrane biological reaction zone group consists of one or more membrane biological reaction zones connected in parallel, and when the membrane biological reaction zone groups are multiple, the plurality of membrane biological reaction zone groups are arranged in the aerobic zone (2) in series; each membrane biological reaction zone (3) is provided with a membrane zone water distribution weir gate (8) and a membrane zone water outlet weir gate (9); a push-flow type submersible mixer (10) is arranged in the anoxic zone and the aerobic zone;
and a second oxidation ditch membrane bioreactor sewage treatment process comprises the following steps:
1) The sewage firstly enters an anaerobic zone and is mixed with reflux liquid from an aerobic zone, phosphorus releasing is carried out on phosphorus-accumulating bacteria in the anaerobic zone under an anaerobic environment, organic pollutants which are easy to degrade are converted, and part of nitrogenous organic matters are aminated;
2) Then the wastewater enters an anoxic zone and is mixed with reflux liquid from an aerobic zone, denitrification is carried out in the anoxic zone in a denitrification process, and partial organic matters are degraded and removed under the action of denitrifying bacteria;
3) Then enters an aerobic zone and a membrane biological reaction zone arranged in the aerobic zone to further degrade organic matters, nitrify ammonia and absorb phosphorus; discharging the treated water from the membrane biological reaction zone;
the second oxidation ditch membrane bioreactor is used for sewage treatment, an oxidation ditch is arranged in the second oxidation ditch membrane bioreactor, the second oxidation ditch membrane bioreactor comprises an anaerobic zone (4), an anoxic zone (1) and an aerobic zone (2) which are continuously arranged, one or more membrane biological reaction zones (3) are arranged in the aerobic zone (2), and the sewage water inlet is arranged in the anaerobic zone (4);
the oxidation ditch is in a gallery type, and the oxidation ditch membrane bioreactor comprises a plurality of oxidation ditches connected in series; the oxidation ditch is formed by dividing a guide wall and comprises a plurality of galleries; the guide wall comprises a middle partition wall (5) and an arc-shaped guide wall (6); the arc guide wall (6) is arranged at the free end of the middle partition wall (5);
the oxidation ditch membrane bioreactor is provided with one or more membrane bioreactor groups, each membrane bioreactor group consists of one or more membrane bioreactor zones connected in parallel, and when the membrane bioreactor groups are multiple, the multiple membrane bioreactor groups are arranged in the aerobic zone (2) in series; each membrane biological reaction zone (3) is provided with a membrane zone water distribution weir gate (8) and a membrane zone water outlet weir gate (9); a partition wall (7) is arranged between the anaerobic zone (4) and the anoxic zone (1); a plug flow type submersible mixer (10) is arranged in the anaerobic zone, the anoxic zone and the aerobic zone.
2. The sewage treatment process of the oxidation ditch membrane bioreactor as claimed in claim 1, wherein the concentration of dissolved oxygen in an anoxic zone is less than 0.5mg/L, the hydraulic retention time is 0.5 to 3h, and the total nitrogen load rate is less than or equal to 0.05 kgTN/(kgMLSS-d).
3. The process of claim 1 wherein the aerobic zone has a dissolved oxygen concentration of > 2mg/L, BOD 5 The sludge load is 0.1 to 0.2kgBOD 5 /(kgMLSS. D), the sludge concentration is 2.5 to 4.5g/L.
4. The wastewater treatment process of an oxidation ditch membrane bioreactor of claim 1, wherein the membrane biological reaction zone is a pulse aeration online cleaning mode.
5. The sewage treatment process of the oxidation ditch membrane bioreactor as claimed in claim 4, wherein the gas-water ratio of the membrane biological reaction zone is 4 to 6, and the pulse aeration gas-water ratio is as follows, wherein the ratio is as follows, and is as follows, that is, the ratio is from 12 to 16.
6. The sewage treatment process of the oxidation ditch membrane bioreactor as claimed in claim 1, wherein the dissolved oxygen concentration of the anaerobic zone is lower than 0.2mg/L, and the hydraulic retention time is 1 to 2h.
7. The sewage treatment process of an oxidation ditch membrane bioreactor according to claim 1, wherein a plurality of guide plates are arranged in each membrane biological reaction zone (3), and the guide plates are staggered up and down in each membrane biological reaction zone (3).
8. An oxidation ditch membrane bioreactor sewage treatment process according to claim 1, characterized in that each membrane biological reaction zone (3) is provided with a membrane module.
9. The oxidation ditch membrane bioreactor sewage treatment process of claim 1 wherein the anoxic zone and the aerobic zone are provided with aeration means.
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