CN110550739A - aerobic and anaerobic VBBR (viable but anaerobic) series coupling device and sewage treatment method - Google Patents
aerobic and anaerobic VBBR (viable but anaerobic) series coupling device and sewage treatment method Download PDFInfo
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- CN110550739A CN110550739A CN201910930412.8A CN201910930412A CN110550739A CN 110550739 A CN110550739 A CN 110550739A CN 201910930412 A CN201910930412 A CN 201910930412A CN 110550739 A CN110550739 A CN 110550739A
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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
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
Abstract
2 2 2The invention relates to a series coupling type sewage treatment device, which comprises an anaerobic reactor and an aerobic reactor, wherein the anaerobic reactor is a baffling type internal circulation bioreactor which is provided with a water inlet, the aerobic reactor is a baffling type internal circulation bioreactor which is provided with a water outlet, a connecting pipe is connected between the anaerobic reactor and the aerobic reactor, a return pipe is connected between the anaerobic reactor and the aerobic reactor, and the flow of the return fluid in the return pipe is 1.5-3 times of the flow of the inlet water in the water inlet.
Description
Technical Field
the invention relates to the field of sewage treatment, in particular to an aerobic and anaerobic VBBR (viable but anaerobic) series coupling device and a sewage treatment method.
Background
The treatment process of domestic sewage treatment plants in cities and towns at home and abroad at present mostly adopts an activated sludge process, the main function of the activated sludge process for treating the domestic sewage is to remove organic matters (generally COD or BOD 5 is taken as an index), more importantly, nitrogen and phosphorus removal are taken as main purposes, the technology and the process for treating the domestic sewage by the activated sludge process have great development after more than 100 years of development, the A 2/O process is also taken as a main part in most of the domestic and foreign municipal sewage treatment plants at present, the A 2/O process is the English abbreviation of Anaeroxic-anaerobic-Oxic, the process has the greatest characteristic of integrating the traditional activated sludge process, biological nitrification and denitrification process, biological phosphorus removal and the like, the A 2/O process flow is shown in figure 1, a biological reaction tank is divided into an anaerobic section, an Anoxic section and an aerobic section through an aeration device, a propeller (anaerobic section and an Anoxic section) and the arrangement of a backflow channel, and the COD, BOD 5, SS and nitrogen and phosphorus which are in various forms are removed one by one in the process flow.
in the activated sludge of the A 2/O biological nitrogen and phosphorus removal system, flora mainly comprises nitrifying and denitrifying bacteria, phosphorus accumulating bacteria and the like, in an aerobic section, nitrifying bacteria convert inflow ammonia nitrogen and organic nitrogen into ammonia nitrogen through ammonia oxidation, and the ammonia nitrogen is converted into nitrate nitrogen through biological nitrification, in an anoxic section, denitrifying bacteria convert inflow nitrate into nitrogen through biological denitrification and the nitrogen escapes into the atmosphere, so that the aim of nitrogen removal is fulfilled, in an anaerobic section, phosphorus accumulating bacteria release phosphorus and absorb organic matters which are easy to degrade, such as lower fatty acid and the like, and in an aerobic section, phosphorus accumulating bacteria absorb phosphorus in excess and remove phosphorus through discharge of residual sludge.
compared with the traditional activated sludge process, the A 2/O biological nitrogen and phosphorus removal system has the greatest characteristics that organic matters, nitrogen and phosphorus can be removed simultaneously by the organic cooperation of three different environmental conditions of anaerobic, anoxic and aerobic conditions and microbial flora types, the nitrate nitrogen can be reduced and removed by using an organic carbon source in inlet water as an electron donor through the internal reflux of mixed liquor, but the process has the obvious disadvantages that (1) the relative concentration or abundance of denitrifying bacteria in an anoxic or anaerobic tank is reduced and the denitrification efficiency is influenced in the mixed liquor internally refluxed to the anoxic tank from an aerobic tank, in addition to the nitrate nitrogen, a large amount of sludge containing nitrifying bacteria is refluxed to the anoxic or anaerobic tank together, in addition to the nitrate nitrogen, and (2) the domestic sewage usually contains multiple components, in a biological treatment system, the removal of pollutants is usually degraded through a certain program or step (Procedural biodada), in the process, the degradation of various pollutants and intermediate products thereof is usually degraded through a certain program or step in a biological treatment system, so that the degradation of the pollutants and the intermediate products of the pollutants and the degradation of the pollutants and the intermediate products of the pollutants are always subjected to the degradation of a stable anaerobic sludge concentration, and the degradation of the anaerobic sludge in the anaerobic tank, which is usually occurs because the anaerobic process, the degradation of anaerobic sludge, the anaerobic sludge is constantly maintained by the stable anaerobic sludge degradation of a microorganism group, the anaerobic sludge degradation of the anaerobic sludge, the degradation of anaerobic sludge, the degradation of the anaerobic tank, the degradation of the.
disclosure of Invention
the invention aims to overcome the defects of the prior art and provide an aerobic and anaerobic VBBR series coupling device with high biodegradation efficiency and stable microbial flora and a series VBBR sewage treatment method.
The purpose of the invention can be realized by the following technical scheme:
The aerobic and anaerobic VBBR series coupling device comprises the following components:
The anaerobic reactor is an internal circulation baffling type bioreactor and is provided with a water inlet;
The aerobic reactor is an internal circulation baffling type bioreactor and is provided with a water outlet;
The connecting pipe is connected between the anaerobic reactor and the aerobic reactor, and the flow direction of fluid inside the connecting pipe is from the anaerobic reactor to the aerobic reactor;
The return pipe is connected between the anaerobic reactor and the aerobic reactor, and the flow direction of the fluid inside the return pipe is from the aerobic reactor to the anaerobic reactor.
Furthermore, the flow rate of the fluid flowing back in the return pipe is 1.5-3 times of the flow rate of the water entering the water inlet.
Further, the anaerobic reactor comprises a first water tank and a first reactor body;
A first circulating water pump for pumping fluid to the first reactor main body is arranged in the first water tank;
The first reactor main body is provided with a first internal circulation pipe for returning fluid to the first water tank;
the inner circulating pipe is provided with a first dissolved oxygen regulating valve;
An anaerobic microorganism layer is attached to the baffle plate in the first reactor main body;
Further, the concentration of dissolved oxygen in the first reactor main body is less than or equal to 0.5mg/L, and the first reactor main body is in an anoxic or anaerobic state;
The concentration of dissolved oxygen in the second reactor main body is 2-5 mg/L, and the second reactor main body is in an aerobic state.
Further, the aerobic reactor comprises a second water tank and a second reactor main body;
A second circulating water pump for pumping fluid to the second reactor main body is arranged in the second water tank;
the second reactor main body is provided with a second inner circulating pipe for returning fluid to the second water tank;
A second dissolved oxygen regulating valve is arranged on the second internal circulation pipe;
an aerobic microorganism layer is attached to the baffle plate in the second reactor main body.
Furthermore, the connecting pipe and the return pipe are both connected between the first water tank and the second water tank;
And a reflux pump connected with a reflux pipe is arranged in the second water tank.
Furthermore, a plurality of layers of sieve plates attached with biological membranes are arranged in the first reactor main body and the second reactor main body;
Furthermore, the dissolved oxygen degree in the first reactor main body is far lower than that in the aerobic reactor, and the first reactor main body is in an anoxic or anaerobic state.
The inlet of the first internal circulation pipe/the second reactor main body is positioned at the top of the first reactor main body/the second reactor main body, the outlet is immersed below the liquid level of the first water tank/the second water tank, and the size of the dissolved oxygen in the first reactor main body can be controlled by adjusting the opening size of the first dissolved oxygen adjusting valve/the second dissolved oxygen adjusting valve. When the first dissolved oxygen regulating valve/the second dissolved oxygen regulating valve are fully opened, air is dissolved in circulating water flow due to siphoning, so that dissolved oxygen in the reactor is increased, and aerobic reaction can be realized. And when the opening of the first dissolved oxygen regulating valve/the second dissolved oxygen regulating valve is closed, the reactor can be almost in an anaerobic condition. When the valve is adjusted to a certain opening degree, the anaerobic zone and the aerobic zone can be arranged in the same reactor.
Because of the structural characteristics of VBBR, the biomembrane attached and grown on each layer of sieve plate in the reactor has a relatively stable structure, which ensures that the biomembrane main body in the reactor can not flow along with the liquid although the wastewater liquid continuously and circularly flows in the reactor in the running process of the reactor, thereby the effluent contains very little suspended substances.
the serial VBBR sewage treatment method applied to the device comprises the following steps:
introducing the sewage to be treated with the flow rate of Q m 3/L into an anaerobic VBBR for anaerobic treatment;
introducing the sewage subjected to anaerobic treatment into an aerobic VBBR (viable but non-viable) for aerobic treatment to obtain treated water, and discharging the treated water;
And pumping a part of the discharged water with the flow rate of alpha.Q back to the anaerobic VBBR to form a reflux circulation.
Nitrate nitrogen converted from ammonia nitrogen is contained in the aerobic VBBR effluent water, and after the aerobic VBBR effluent water enters the anaerobic (anoxic) VBBR effluent water, efficient denitrification reaction can be realized by utilizing an organic carbon source in the influent water. The key process parameter here is the determination of the reflux ratio, i.e. the coefficient alpha.
furthermore, the alpha value is between 1.5 and 3, nitrate nitrogen converted from ammonia nitrogen is contained in the aerobic VBBR effluent water, and after the aerobic VBBR effluent water enters the anaerobic (anoxic) VBBR water, efficient denitrification reaction can be realized by utilizing an organic carbon source in the influent water, so that the optimal treatment effect is obtained in the range.
Furthermore, the anaerobic VBBR and the aerobic VBBR are respectively subjected to anaerobic sewage treatment and aerobic sewage treatment by adjusting the dissolved oxygen rate in the anaerobic VBBR and the aerobic VBBR.
further, in order to further reduce the concentration of suspended matters in the effluent, a sand filter or a membrane module can be selected to replace the sedimentation tank.
Furthermore, the aerobic VBBR is a sealing structure, and the utilization rate of dissolved oxygen in the reactor is high.
compared with the prior art, the invention has the following advantages:
1) In the invention, the sewage to be treated firstly enters the anaerobic (anoxic) VBBR, the effluent water after the anaerobic (anoxic) VBBR enters the aerobic VBBR, and simultaneously, a part (alpha.Q) of the effluent water of the aerobic VBBR flows back to the anaerobic (anoxic) VBBR. In the circulating flows, the sludge cannot circularly flow between the two reactors along with the liquid, so that the two reactors are ensured to respectively have stable microbial communities, and the biological reaction efficiency is high.
2) the biomembrane attached and grown on each layer of sieve plate in the reactor has a relatively stable structure, so that the main body of the biomembrane in the reactor can not run off along with the flowing of the liquid although the wastewater liquid continuously and circularly flows in the reactor in the running process of the reactor, and suspended matters contained in the effluent are very little.
3) the anaerobic VBBR is closed, so that air is isolated from entering, electrons provided by an organic carbon source are prevented from being consumed in dissolved oxygen, and the carbon source can be fully used for denitrification reaction in the treatment process.
Drawings
FIG. 1 is a schematic flow diagram of a prior art A 2/O process;
FIG. 2 is a schematic flow chart of the tandem VBBR sewage treatment process of the present invention;
FIG. 3 is a schematic structural diagram of an aerobic/anaerobic VBBR series coupling device in accordance with the present invention;
FIG. 4 is a graph showing the effect of anaerobic (anoxic) denitrification of VBBR, the effect of NO 3 - -N removal;
FIG. 5 is a graph showing the nitrification effect of aerobic VBBR and the removal effect of NH 4 + -N.
In the figure: 1. anaerobic reactor, 2, water inlet, 3, aerobic reactor, 4, water outlet, 5, connecting pipe, 6, return pipe, 11, first water tank, 12, first reactor body, 13, first circulating water pump, 14, first internal circulating pipe, 15, first dissolved oxygen regulating valve, 31, second water tank, 32, second reactor body, 33, second circulating water pump, 34, second internal circulating pipe, 35, second dissolved oxygen regulating valve, 36, reflux pump.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
examples
The purpose of the invention can be realized by the following technical scheme:
the invention discloses an aerobic and anaerobic VBBR (variable-volume BR) series coupling device, which mainly comprises an anaerobic reactor 1 and an aerobic reactor 3, wherein the anaerobic reactor 1 is an internal circulation bioreactor and is provided with a water inlet 2; the aerobic reactor 3 is an internal circulation bioreactor, and is provided with a water outlet 4; the connecting pipe 5 is connected between the anaerobic reactor 1 and the aerobic reactor 3, and the flow direction of the fluid inside the connecting pipe is from the anaerobic reactor 1 to the aerobic reactor 3; the return pipe 6 is connected between the anaerobic reactor 1 and the aerobic reactor 3, and the flow direction of the fluid inside the return pipe is from the aerobic reactor 3 to the anaerobic reactor 1. The flow rate of the fluid flowing back in the return pipe 6 is 1.5-3 times of the flow rate of the water entering the water inlet 2.
the anaerobic reactor 1 includes a first water tank 11 and a first reactor body 12; a first circulating water pump 13 for pumping fluid to the first reactor main body 12 is arranged in the first water tank 11; the first reactor main body 12 is provided with a first internal circulation pipe 14 for returning fluid to the first water tank 11; the inner circulating pipe 14 is provided with a first dissolved oxygen adjusting valve 15. The aerobic reactor 3 includes a second water tank 31 and a second reactor main body 32; a second water circulation pump 33 for pumping fluid to the second reactor body 32 is arranged in the second water tank 31; a second internal circulation pipe 34 for returning fluid to the second water tank 31 is provided on the second reactor main body 32; the second internal circulation pipe 34 is provided with a second dissolved oxygen adjusting valve 35. The connecting pipe 5 and the return pipe 6 are both connected between the first water tank 11 and the second water tank 31; a return pump 36 connected to the return pipe 6 is provided in the second tank 31.
a plurality of layers of sieve plates attached with biological membranes are arranged in the first reactor main body 12 and the second reactor main body 32; the dissolved oxygen level in the first reactor body 12 is lower than that in the aerobic reactor 3. Because of the structural characteristics of VBBR, the biomembrane attached and grown on each layer of sieve plate in the reactor has a relatively stable structure, which ensures that the biomembrane main body in the reactor can not run off along with the liquid flow although the wastewater liquid continuously and circularly flows in the reactor in the running process of the reactor, thereby the suspended matters contained in the effluent are very little.
the inlet of the first internal circulation pipe 14/the second reactor main body 34 is positioned at the top of the first reactor main body 12/the second reactor main body 34, the outlet is immersed below the liquid level of the first water tank 11/the second water tank 31, and the size of the dissolved oxygen in the first reactor main body 12 can be realized by adjusting the opening size of the first dissolved oxygen adjusting valve 15/the second dissolved oxygen adjusting valve 35. When the first dissolved oxygen adjusting valve 15/the second dissolved oxygen adjusting valve 35 are fully opened, air is dissolved in the circulating water flow due to the siphon action, so that the dissolved oxygen in the reactor is increased, and the aerobic reaction can be realized. And when the opening degree of the first dissolved oxygen adjusting valve 15/the second dissolved oxygen adjusting valve 35 is closed, the reactor can be almost under the anaerobic condition. When the valve is adjusted to a certain opening degree, the reactor can be positioned in an anaerobic zone and an aerobic zone.
In the specific application process, referring to fig. 2, the method comprises the following steps:
the method comprises the steps of introducing sewage to be treated with the flow rate of Q m 3/L into anaerobic VBBR for anaerobic treatment, introducing the sewage after the anaerobic treatment into aerobic VBBR for aerobic treatment to obtain treated water, discharging the treated water, pumping a part of the discharged water with the flow rate of alpha.Q back into the anaerobic VBBR to form a backflow circulation, wherein nitrate converted from ammonia nitrogen is contained in effluent water of the aerobic VBBR, and after the effluent water enters the anaerobic (anoxic) VBBR, efficient denitrification reaction can be realized by utilizing an organic carbon source in inlet water.
Denitrification Effect test of anaerobic (anoxic) VBBR
in order to prove that anaerobic (anoxic) VBBR has a denitrification function, a first dissolved oxygen adjusting valve 15 in FIG. 3 is closed, and denitrification experimental study is carried out by using the reactor, different C/N denitrification experiments are carried out, wherein 150L of sodium nitrate solution with 50mg/L of initial NO 3 - -N concentration is respectively added from a water inlet 2, glucose is added according to the proportion of 0.70-2.68, water samples with 0h, 1h, 2h, 3h, 4h, 5h and 6h are respectively taken out from a water outlet 4, the temperature is controlled to be (28 +/-2 ℃), DO in the water tank is (1 +/-0.5) mg/L at the beginning of each group of reaction, the DO is approximately 0.5mg/L after 1h, the pH is 7.5 +/-0.5, the concentrations of NO 3 - -N and NO 2 - -N are measured, experimental results are shown in FIG. 4, actual measurement value is shown in the graph, (C) shows calculation value, experimental results show that anaerobic fitting can achieve anaerobic (anoxic) treatment, and denitrification effect is good.
Nitration effect test of aerobic VBBR
in order to prove that the aerobic VBBR has the nitrification function, the opening of the first dissolved oxygen regulating valve in figure 3 is fully opened, so that the reactor is in an aerobic state, and the reactor is utilized to carry out nitrification experimental study, the prepared solution is that the concentration of initial NH 4 + -N of test sewage added from a water inlet 2 is about 25mg/L, the concentration of NaHCO 3 is 20mg/L, the flow mode of domesticated water is regulated, the reaction is carried out at (28 +/-2) DEG C, water samples at a water inlet 4 are taken out at certain intervals for testing, the content change of the measured NH 4 + -N is shown in figure 5, and the experimental result proves that the aerobic VBBR can realize the nitrification reaction and achieve good treatment effect.
Stability of the flora test
The effluent hardly contains activated sludge under the condition that a reflux liquid which flows back from the aerobic VBBR to the anaerobic (anoxic) VBBR does not need to be provided with an independent sedimentation tank. The concentration of dissolved oxygen in anaerobic (anoxic) VBBR is very low, almost all organic carbon sources in inlet water can be used for denitrification reaction, and the utilization rate of the dissolved oxygen in the reactor is high due to the fact that aerobic VBBR is closed. The biomembrane attached and grown on each layer of sieve plate in the reactor has a relatively stable structure, so that the main body of the biomembrane in the reactor can not run off along with the flow of the liquid although the wastewater liquid continuously and circularly flows in the reactor in the running process of the reactor, and suspended matters contained in the effluent are very little. Similarly, the aerobic VBBR flows from the anaerobic (anoxic) VBBR, and is also almost free of sludge. The microbial community profiles within the two reactors are thus not affected by each other.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. An aerobic and anaerobic VBBR (VBBR) series coupling device, which is characterized by comprising:
The anaerobic reactor (1) is an internal circulation bioreactor and is provided with a water inlet (2);
The aerobic reactor (3) is an internal circulation bioreactor and is provided with a water outlet (4);
The connecting pipe (5) is connected between the anaerobic reactor (1) and the aerobic reactor (3), and the flow direction of the fluid inside the connecting pipe is from the anaerobic reactor (1) to the aerobic reactor (3);
the return pipe (6) is connected between the anaerobic reactor (1) and the aerobic reactor (3), and the flow direction of the fluid inside the return pipe is from the aerobic reactor (3) to the anaerobic reactor (1).
2. The VBBR in series connection device as claimed in claim 1, wherein the flow rate of the fluid flowing back in the return pipe (6) is 1.5-3 times of the flow rate of the water flowing in the water inlet (2).
3. An aerobic and anaerobic VBBR in series connection coupling device according to claim 1, wherein the anaerobic reactor (1) comprises a first tank (11) and a first reactor body (12);
A first circulating water pump (13) for pumping fluid to the first reactor main body (12) is arranged in the first water tank (11);
the first reactor main body (12) is provided with a first internal circulating pipe (14) for returning fluid to the first water tank (11);
The outlet end of the internal circulation pipe (14) is immersed under the liquid level in the first water tank (11), and a first dissolved oxygen regulating valve (15) is arranged on the first internal circulation pipe (14).
4. An aerobic and anaerobic VBBR in series connection coupling device according to claim 3, wherein said aerobic reactor (3) comprises a second tank (31) and a second reactor body (32);
a second circulating water pump (33) for pumping fluid to the second reactor main body (32) is arranged in the second water tank (31);
a second inner circulating pipe (34) which returns fluid to the second water tank (31) is arranged on the second reactor main body (32);
the outlet end of the second internal circulation pipe (34) is immersed under the liquid level in the second water tank (31), and a second dissolved oxygen regulating valve (35) is arranged on the second internal circulation pipe (34).
5. an aerobic and anaerobic VBBR in series connection device according to claim 4, wherein the connection pipe (5) and the return pipe (6) are connected between the first water tank (11) and the second water tank (31);
A return pump (36) connected with the return pipe (6) is arranged in the second water tank (31).
6. the VBBR in series coupling device of claim 4, wherein the first reactor body (12) and the second reactor body (32) are each provided with a plurality of layers of sieve plates attached with biofilm.
7. The VBBR in series connection device as claimed in claim 4, wherein the dissolved oxygen concentration in the first reactor body (12) is less than or equal to 0.5mg/L, and the first reactor body (12) is in an anoxic or anaerobic state;
The concentration of dissolved oxygen in the second reactor main body (32) is 2-5 mg/L, and the second reactor main body (32) is in an aerobic state.
8. A serial VBBR sewage treatment method is characterized by comprising the following steps:
introducing the to-be-treated sewage with the flow rate of Q m 3/L into anaerobic VBBR for anaerobic treatment;
Inputting the sewage subjected to anaerobic treatment into an aerobic VBBR (vertical anaerobic tank reactor) through a connecting pipe (5), and carrying out aerobic treatment to obtain treated water which is discharged outside;
And pumping a part of the discharged water with the flow rate of alpha.Q back to the anaerobic VBBR to form a reflux circulation.
9. The in-line VBBR sewage treatment method of claim 8, wherein α is between 1.5-3.
10. The in-line VBBR sewage treatment method of claim 8, wherein the anaerobic VBBR and the aerobic VBBR are subjected to anaerobic sewage treatment and aerobic sewage treatment respectively by adjusting the dissolved oxygen rate of the anaerobic VBBR and the aerobic VBBR.
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