CN114105292A - Wastewater denitrification device and process and application - Google Patents
Wastewater denitrification device and process and application Download PDFInfo
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- CN114105292A CN114105292A CN202010879663.0A CN202010879663A CN114105292A CN 114105292 A CN114105292 A CN 114105292A CN 202010879663 A CN202010879663 A CN 202010879663A CN 114105292 A CN114105292 A CN 114105292A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
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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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
Abstract
The invention discloses a wastewater denitrification device, a process and application. The device is including the ammoniation reaction tank, good oxygen reaction tank, membrane biological reaction pond and the oxygen deficiency reaction tank that communicate in proper order, wherein, the ammoniation reaction tank is used for carrying out the ammoniation reaction, good oxygen reaction tank is used for carrying out first nitration, membrane biological reaction tank is used for carrying out the second nitration, the oxygen deficiency reaction tank is used for carrying out the denitrification reaction. The device is simple, the wastewater denitrification process is simple and convenient, the operation is easy, the total nitrogen treatment efficiency is high, and finally the standard discharge of the total nitrogen can be realized.
Description
Technical Field
The invention relates to a wastewater denitrification device and process and application.
Background
The oil refining and petrochemical industries generate a large amount of industrial wastewater while using a large amount of water, and the treatment and the recycling of the part of wastewater are very necessary under the condition of water resource shortage at present. Nitrogen is one of the main pollutants of petrochemical wastewater, and exists in the form of: ammonia nitrogen, organic nitrogen, nitrite nitrogen and nitrate nitrogen. At present, the control of nitrogen indexes in waste water discharge or reuse is more and more strict at home and abroad, particularly, the nitrogen and phosphorus indexes of waste water in Europe are more strict, the traditional three-set (oil removal, flotation and aeration) waste water treatment method can not meet the requirements at all, and many countries begin to develop and research the sewage denitrification technology to improve the denitrification efficiency.
Organic nitrogen is used as one of main components of total nitrogen of wastewater, and the effective treatment of the organic nitrogen directly influences the standard discharge of the total nitrogen. The degradation of organic nitrogen in wastewater and the removal of ammonia nitrogen generated by the degradation are key and difficult points of organic nitrogen wastewater treatment. The organic nitrogen industrial wastewater has the characteristics of high CODcr, high total nitrogen and large water quality change, and is industrial wastewater which is difficult to treat. In the actual process of treating the organic nitrogen industrial wastewater, if the organic nitrogen is not effectively and completely aminated in the anaerobic stage, the amination reaction continues to occur in the aerobic stage, and finally the total nitrogen of the water can be caused to be not up to the standard. Therefore, the method needs to adopt a high-efficiency and stable organic nitrogen ammoniation process, improve the efficiency of a wastewater biochemical treatment system and provide higher feasibility for subsequent standard discharge.
Disclosure of Invention
Compared with the existing device and process with the same level of denitrification efficiency, the device is simple, the process is simple and convenient, the operation is easy, the total nitrogen treatment efficiency is high, and finally the standard discharge of the total nitrogen can be realized.
In the present invention, the use of directional terms such as "upper, lower, left, right, top, side, left, right" without going to the contrary, generally means upper, lower, left, right, top, side, left, right as shown in the drawings; "center, outer" means the center, outer with respect to the contour of each component itself.
In the present invention, unless otherwise specified, "sequential", "leading end", "inlet", "outlet" and "tail" refer to sequential, leading end, inlet, outlet and tail in the flow direction of a fluid.
The invention provides a device for denitrification of wastewater, which comprises an ammonification reaction tank, an aerobic reaction tank, a membrane biological reaction tank and an anoxic reaction tank which are sequentially communicated, wherein the ammonification reaction tank is used for carrying out ammonification reaction, the aerobic reaction tank is used for carrying out primary nitrification reaction and/or nitrosation reaction, the membrane biological reaction tank is used for carrying out secondary nitrification reaction and/or nitrosation reaction, and the anoxic reaction tank is used for carrying out denitrification reaction.
According to some embodiments of the apparatus of the present invention, a # 1 mechanical stirring paddle is disposed in the ammoniation reaction tank. The device is used for ensuring the full mixing of the activated sludge, the ammonifying bacteria, the powdered activated carbon and the wastewater in the ammonification reaction tank.
According to some embodiments of the device of the present invention, a # 1 pH probe and a # 1 dissolved oxygen probe are disposed in the ammonification reaction tank. For monitoring wastewater pH and dissolved oxygen changes.
According to some embodiments of the apparatus of the present invention, a line mixer is disposed on the ammonification reaction tank inlet line and is in communication with the drug feeding line.
According to some embodiments of the device of the present invention, the ammonification reaction tank inlet line is communicated with a # 1 bacteria feeding line. Ammoniated bacteria are added through a No. 1 bacteria adding pipeline.
According to some embodiments of the apparatus of the present invention, a # 1 aeration system is disposed in the ammonification reaction tank.
According to some embodiments of the apparatus of the present invention, a water inlet pump is provided between the ammoniation reaction tank and the source of wastewater.
According to some embodiments of the device of the present invention, a vertical partition is disposed in the aerobic reaction tank for dividing the interior of the aerobic reaction tank into two reaction zones which are communicated with each other. Preferably, the aerobic reaction tank is provided with a partition plate at 1/3-2/3, so that the reaction tank body can be divided into two reaction zones which are communicated up and down.
According to some embodiments of the device of the present invention, the partition is provided with a # 2 aeration system at a side close to the ammonification reaction tank. Preferably, a No. 2 aeration system is arranged on one side of the partition board close to the ammonification reaction tank, and internal circulation is formed through bottom aeration.
According to some embodiments of the apparatus of the present invention, the spacer is vertically installed with biological packing on a side away from the ammonification reaction tank. Preferably, the biological filler is a polypropylene fibre biological filler. The biological filler forms swimming movement under the action of hydraulic turbulence.
According to some embodiments of the apparatus of the present invention, a # 2 pH probe and a # 2 dissolved oxygen probe are disposed in the aerobic reaction tank. For monitoring wastewater pH and dissolved oxygen changes.
According to some embodiments of the apparatus of the present invention, the aerobic reaction tank inlet line is in communication with a # 2 bacteria feeding line. The # 2 addition line is used for adding nitrifying bacteria and/or nitrosobacteria, such as but not limited to nitrosomonas and/or acidomicrobia. The aerobic reaction tank coexists with a biological membrane, common activated sludge and nitrifying and/or nitrosating strains so as to improve the nitrification of ammonia nitrogen in the wastewater by the dominant microorganisms in the aerobic reaction tank.
According to some embodiments of the apparatus of the present invention, a # 3 aeration system is disposed in the membrane bioreactor tank. The wastewater in the membrane biological reaction tank contains activated sludge and nitrifying and/or nitrosification strains, and the wastewater can be subjected to further nitrification reaction. And a 3# aeration system is arranged at the bottom of the membrane biological reaction tank and is used for providing dissolved oxygen required by nitration reaction and nitrosation reaction.
According to some embodiments of the apparatus of the present invention, a flat ultrafiltration membrane is disposed within the membrane bioreactor tank. Preferably, the ultrafiltration membrane is made of chlorinated polyvinyl chloride. The sludge in the membrane biological reaction tank flows back to the front end of the aerobic reaction tank through a pump, so that the nitrifying and/or nitrosifying bacteria added in the aerobic reaction tank are ensured not to be lost.
According to some embodiments of the apparatus of the present invention, a # 2 mechanical stirring paddle is disposed in the anoxic reaction tank. The liquid in the anoxic reaction tank is accompanied by mechanical stirring, and activated sludge and powdered activated carbon are arranged in the tank.
According to some embodiments of the apparatus of the present invention, a 3# pH probe and a 3# dissolved oxygen probe are disposed in the anoxic reaction tank.
According to some embodiments of the apparatus of the present invention, the anoxic reaction tank inlet line is in communication with # 3 bacteria feeding line. For adding reducing bacteria, preferably nitrate reducing bacteria.
According to some embodiments of the apparatus of the present invention, a # 4 aeration system is disposed in the anoxic reaction tank.
According to some embodiments of the device of the present invention, a suction pump is disposed between the anoxic reaction tank and the membrane biological reaction tank.
According to some embodiments of the apparatus of the present invention, the ammonification reaction tank and/or the anoxic reaction tank are in communication with a # 2 blower for supplying nitrogen gas. When the dissolved oxygen in the ammoniation reaction tank and/or the anoxic reaction tank is more than 0.5mg/L, introducing nitrogen to reduce the concentration of the dissolved oxygen.
According to some embodiments of the apparatus of the present invention, the aerobic reaction tank and/or the membrane biological reaction tank is in communication with a # 1 blower for providing air and/or pure oxygen. Air or pure oxygen needs to be continuously introduced into the aerobic reaction tank and/or the membrane biological reaction tank so as to ensure the concentration of dissolved oxygen needed by nitrifying nitrosobacteria.
According to some embodiments of the apparatus of the present invention, the bottom of the ammonification reaction tank, the aerobic reaction tank, the membrane biological reaction tank and the anoxic reaction tank are communicated with a sludge reflux pump for irregular sewage discharge.
According to some embodiments of the apparatus of the present invention, the apparatus further comprises a raw water tank for containing wastewater to be treated, and preferably, a # 4 pH probe is disposed in the raw water tank.
According to some embodiments of the apparatus of the present invention, the ammonification reaction tank, the aerobic reaction tank, the flat membrane biological reaction tank and the anoxic tank are provided with quartz sand aeration heads at the bottom.
The second aspect of the present invention provides a wastewater denitrification process, comprising:
(1) the wastewater to be treated enters an ammoniation reaction tank and is subjected to ammoniation reaction to obtain a first effluent;
(2) the first effluent enters an aerobic reaction tank and is subjected to a first-stage nitration reaction and/or a nitrosation reaction to obtain a second effluent;
(3) the second effluent enters a membrane biological reaction tank to carry out a second-stage nitration reaction and/or a nitrosation reaction to obtain a third effluent;
(4) and the fourth effluent enters an anoxic reaction tank for denitrification reaction.
According to some embodiments of the process of the present invention, the ammoniation reaction is performed in the ammoniation reaction tank by adding ammoniating bacteria in the presence of activated sludge and powdered activated carbon.
According to some embodiments of the process of the present invention, the ammoniating bacteria is selected from at least one of bacillus mycoides, bacillus subtilis, and bacillus putrescentiae.
According to some embodiments of the process of the present invention, the reaction conditions within the ammoniation reaction tank include: the pH value is 7-8.
According to some embodiments of the process of the present invention, the reaction conditions within the ammoniation reaction tank include: the dissolved oxygen is less than 0.5 mg/L.
According to some embodiments of the process of the present invention, the reaction conditions within the ammoniation reaction tank include: the mechanical stirring speed is 80-200 rpm.
According to some embodiments of the process of the present invention, the reaction conditions within the ammoniation reaction tank include: the adding amount of the ammonifying bacteria is 10-50 mg/L when the device is started.
According to some embodiments of the process of the present invention, the reaction conditions within the ammoniation reaction tank include: the addition amount of the ammonifying bacteria in the normal operation of the device is 0-1 mg/L.
According to some embodiments of the process of the present invention, the reaction conditions within the ammoniation reaction tank include: the concentration of the activated sludge (MLSS) is 2000-4000 mg/L.
According to some embodiments of the process according to the present invention, the nitrification and/or nitritation is performed in the aerobic reaction tank by adding nitrifying bacteria and/or nitrifying bacteria in the presence of biofilm and activated sludge.
According to some embodiments of the process of the present invention, the bacteria are nitrosomonas and/or acidobacter, more preferably the nitrosomonas and acidobacter are used in a ratio of 1:1 to 10: 1.
According to some embodiments of the process of the present invention, the reaction conditions in the aerobic reaction tank include: the pH value is 7.5-8.5.
According to some embodiments of the process of the present invention, the reaction conditions in the aerobic reaction tank include: the dissolved oxygen is 2-4 mg/L.
According to some embodiments of the process of the present invention, the reaction conditions in the aerobic reaction tank include: the adding amount of the nitrifying bacteria and/or the nitrosobacteria is 10-50 mg/L when the device is started.
According to some embodiments of the process of the present invention, the reaction conditions in the aerobic reaction tank include: the adding amount of the nitrifying bacteria and/or the nitrosobacteria in the normal operation of the device is 0-1 mg/L.
According to some embodiments of the process of the present invention, the reaction conditions in the aerobic reaction tank include: the concentration of activated sludge (MLSS) is 3000-6000 mg/L.
According to some embodiments of the process of the present invention, the reaction conditions within the membrane bioreactor tank include: the dissolved oxygen is 2-4 mg/L.
According to some embodiments of the process of the present invention, the reaction conditions within the membrane bioreactor tank include: the concentration of activated sludge (MLSS) is 3000-6000 mg/L.
According to some embodiments of the process of the present invention, the denitrification reaction is performed in the anoxic reaction tank in the presence of activated sludge and powdered activated carbon by adding reducing bacteria, preferably the reducing bacteria are nitrate reducing bacteria.
According to some embodiments of the process of the present invention, the reaction conditions in the anoxic reaction tank comprise: the pH value is 7-8.
According to some embodiments of the process of the present invention, the reaction conditions in the anoxic reaction tank comprise: the dissolved oxygen is less than 0.5 mg/L.
According to some embodiments of the process of the present invention, the reaction conditions in the anoxic reaction tank comprise: the mechanical stirring speed is 80-200 rpm.
According to some embodiments of the process of the present invention, the reaction conditions in the anoxic reaction tank comprise: the adding amount of the ammonifying bacteria is 10-50 mg/L when the device is started.
According to some embodiments of the process of the present invention, the reaction conditions in the anoxic reaction tank comprise: the addition amount of the ammonifying bacteria in the normal operation of the device is 0-1 mg/L.
According to some embodiments of the process of the present invention, the reaction conditions in the anoxic reaction tank comprise: the concentration of the activated sludge (MLSS) is 2000-4000 mg/L.
According to some embodiments of the process of the present invention, the total nitrogen concentration of the wastewater to be treated is 200-800 mg/L.
According to some embodiments of the process of the present invention, the organic nitrogen content of the wastewater to be treated is greater than 90% by weight of the total nitrogen content.
According to some embodiments of the process of the present invention, the COD of the wastewater to be treated is 2500-10000 mg/L.
In a third aspect, the present invention provides the use of the above-described apparatus for denitrification of wastewater or the above-described wastewater denitrification process for wastewater treatment.
The invention has the beneficial effects that:
according to the invention, different microbial agents are added into different reaction zones, and the reaction conditions of each functional zone are strictly controlled to ensure the quantity of the specific microbial agents in each functional zone and the treatment effect of the specific microbial agents on pollutants in each functional zone. Preferably, firstly, the ammonifying bacteria are added into the ammonification reaction tank to reinforce the ammonification reaction effect, and the powdered activated carbon is added into the ammonification reaction tank to enable the ammonification reaction tank to adsorb the sludge and the ammonifying bacteria, and meanwhile, the stirring speed is controlled, so that on one hand, the microbial inoculum, the activated sludge and the wastewater are fully mixed, on the other hand, the loss of the ammonification bacteria is prevented, and the concentration and the reaction activity of microorganisms which are superior to the ammonification reaction are ensured; the aerobic reaction tank utilizes a contact oxidation and internal circulation aeration process to quickly form a film on the polypropylene biological filler, and the added nitrifying and nitrosifying bacteria complete the nitration reaction of the wastewater; filtering the effluent of the aerobic tank by a flat ultrafiltration membrane, so that nitrite and nitrifying bacteria in the aerobic reaction tank are all trapped in the aerobic reaction tank, and the added nitrifying and nitrite bacteria circularly react in the aerobic reaction tank and the membrane biological reaction tank; finally, powdery active carbon and nitrate reducing bacteria are added into the anoxic reaction tank to enhance the denitrification treatment effect. In the whole process, under the preferable reaction condition of each unit, the unicity of each unit strain can be ensured, the treatment effect of each unit is further enhanced, and the total nitrogen treatment efficiency of the wastewater is improved. And moreover, the starting speed of biological reaction can be greatly accelerated by adding special strains into each reaction zone, and compared with the existing process with the same level of denitrification efficiency, the process disclosed by the invention is simple and convenient, easy to operate and high in total nitrogen treatment efficiency, and finally realizes standard emission of total nitrogen.
Drawings
FIG. 1 is a schematic view of an apparatus for denitrification of wastewater according to example 1 of the present invention.
Description of the reference numerals
1. A raw water pool, 2, 4# pH probes, 3, a water inlet pump, 4, a pipeline mixer, 5, a medicine adding pipeline, 6, 1# bacteria adding pipeline, 7, an ammoniation reaction pool, 8, 1# mechanical stirring paddle, 9, 1# dissolved oxygen probe, 10, 1# pH probe, 11, 1# aeration system, 12, 2# bacteria adding pipeline, 13, an aerobic reaction pool, 14, 2# aeration system, 15, a clapboard, 16, polypropylene fiber biological filler, 17, 2# dissolved oxygen probe, 18, 2# pH probe, 19, a membrane biological reaction pool, 20, a flat ultrafiltration membrane, 21, 3# aeration system, 22, a suction pump, 23, 3# bacteria adding pipeline, 24, an anoxic reaction pool, 25, 2# mechanical stirring paddle, 26, 4# aeration system, 27, 3# dissolved oxygen probe, 28, 3# pH probe, 29, a sludge reflux pump, 30, 1# blower, 31, 2# blower.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description of the invention is given by way of example only, and is not intended to limit the scope of the invention.
In the following examples and comparative examples,
the bacillus subtilis is purchased from China general microbiological culture collection center with the preservation number of CGMCC 1.3376.
Nitrosomonas was purchased from Jiuzu environmental science and technology Co.
The acid micro-bacterium is purchased from Jiangsu Jiu environmental science and technology Co.
The nitrate reducing bacteria are purchased from China general microbiological culture collection center with the preservation number of CGMCC 1.8928T。
[ example 1 ]
A device for denitrification of wastewater is shown in figure 1 and comprises an ammoniation reaction tank 7, an aerobic reaction tank 13, a membrane biological reaction tank 19 and an anoxic reaction tank 24 which are communicated in sequence.
The wastewater to be treated in the raw water tank 1 is lifted by the water inlet pump 3 and then enters the ammonification reaction tank 7. A4 # pH probe 2 is arranged in a raw water tank 1, the pH of the wastewater is monitored, when the pH of the wastewater is too high or too low, acid or alkali is added through a medicine adding pipeline 5 and mixed by a pipeline mixer 4, and then the wastewater enters an ammoniation reaction tank 7, a 1# mechanical stirring paddle 8 and a 1# aeration system 11 are arranged in the ammoniation reaction tank 7, and a 1# dissolved oxygen probe 9 and a 1# pH probe 10 are arranged in the ammoniation reaction tank for controlling the ammoniation reaction conditions. The ammonification reaction tank is started and normally operated, ammonification bacteria are added through a No. 1 bacteria adding pipeline 6, and supernatant of the ammonification reaction tank automatically flows into the aerobic reaction tank 13. The aerobic reaction tank 13 is divided into two parts by a partition plate 15, the left side forms internal circulation through a bottom 2# aeration system 14, the right side of the partition plate is provided with a polypropylene fiber biological filler 16, the aerobic reaction tank is provided with a 2# dissolved oxygen probe 17 and a 2# pH probe 18 for controlling nitration reaction and/or nitrosation reaction conditions, the start and normal operation of the aerobic reaction tank are that nitrobacteria and nitrosation bacteria are added through a 2# bacteria adding pipeline 12, the effluent of the aerobic reaction overflows into a membrane biological reaction tank 19, the membrane biological reaction tank 19 is provided with a flat ultrafiltration membrane 20, and the bottom is provided with a 3# aeration system 21. The wastewater in the membrane tank is sent to an anoxic reaction tank 24 through a suction pump 22. The anoxic reaction tank 24 is provided with a No. 2 mechanical stirring paddle 25 and a No. 4 aeration system 26, and the anoxic reaction tank 24 is provided with a No. 3 dissolved oxygen probe 27 and a No. 3 pH probe 28 for controlling denitrification reaction conditions. Nitrate reducing bacteria are required to be added through a 3# bacteria adding pipeline 23 when the anoxic reaction tank is started and normally operates, and waste water can be directly discharged after the anoxic reaction.
The bottoms of the ammoniation reaction tank 7, the aerobic reaction tank 13, the membrane biological reaction tank 19 and the anoxic reaction tank 24 are all provided with sludge discharge outlets for irregularly discharging sludge and powdered activated carbon in the tanks.
The ammoniation reaction tank 7 and the anoxic reaction tank 24 are supplied with nitrogen gas by a # 2 blower 31. The aerobic reaction tank 13 and the membrane biological reaction tank 19 are supplied with air or pure oxygen through a No. 1 fan 30.
The sludge in the membrane biological reaction tank 19 flows back to the inlet pipeline of the aerobic reaction tank 13 through the sludge return pump 29.
[ example 2 ]
The apparatus of example 1 was used for denitrification of wastewater.
The total nitrogen concentration of the wastewater to be treated is 200 mg/L; the concentration of organic nitrogen is 190 mg/L; COD was 2000 mg/L.
In a laboratory, an ammoniation reaction tank with an effective volume of 5 liters, an aerobic reaction tank with an effective volume of 5 liters, a membrane biological reaction tank with an effective volume of 2.5 liters and an anoxic reaction tank with an effective volume of 5 liters are used for inoculating the same sludge, and the sludge concentration is respectively: 3000mg/L of ammoniation reaction tank MLSS (concentration of activated sludge), 4000mg/L of aerobic reaction tank MLSS, 4000mg/L of membrane biological reaction tank MLSS, 3000mg/L of anoxic reaction tank MLSS, the treatment process runs continuously, and the main working procedures are as follows: the ammonification reaction tank stays for 12 hours, the aerobic reaction tank stays for 24 hours, the membrane biological reaction tank stays for 12 hours, and the anoxic reaction tank stays for 12 hours; the dissolved oxygen of the ammoniation reaction tank is less than 0.5mg/L, the dissolved oxygen of the aerobic reaction tank is 2mg/L, the dissolved oxygen of the membrane biological reaction tank is 2mg/L, and the dissolved oxygen of the anoxic reaction tank is less than 0.5 mg/L. The pH value of the ammonification reaction tank is 7, the mechanical stirring speed is 80rpm, the adding amount of the bacillus subtilis is 20mg/L when the ammonification reaction tank is started, and the bacillus subtilis is continuously added by 0.05mg/L after the ammonification reaction tank is normally operated; the pH value of the aerobic reaction tank is 8, the adding amount of 1:1 mixed nitrosomonas and acidobacter is 20mg/L when the aerobic reaction tank is started, and 0.05mg/L of 1:1 mixed nitrosomonas and acidobacter is continuously added after the aerobic reaction tank is normally operated; the pH value of the anoxic reaction tank is 7-8, the mechanical stirring speed is 80rpm, the adding amount of the nitrate reducing bacteria is 20mg/L during starting, and 0.05mg/L of the nitrate reducing bacteria is continuously added after normal operation. After approximately 15 days of start-up, normal operation, the total nitrogen and organic nitrogen treatment results are shown in table 1.
[ example 3 ]
The apparatus of example 1 was used for denitrification of wastewater.
The total nitrogen concentration of the wastewater to be treated is 800 mg/L; the concentration of organic nitrogen is 760 mg/L; the COD was 8000 mg/L.
In a laboratory, an ammoniation reaction tank with an effective volume of 5 liters, an aerobic reaction tank with an effective volume of 5 liters, a membrane biological reaction tank with an effective volume of 2.5 liters and an anoxic reaction tank with an effective volume of 5 liters are used for inoculating the same sludge, and the sludge concentration is respectively: ammoniation reaction tank MLSS3000mg/L, aerobic reaction tank MLSS4000mg/L, membrane biological reaction tank MLSS4000mg/L, anoxic reaction tank MLSS3000mg/L, the treatment process runs continuously, the main working procedures are as follows: the ammonification reaction tank stays for 12 hours, the aerobic reaction tank stays for 24 hours, the membrane biological reaction tank stays for 12 hours, and the anoxic reaction tank stays for 12 hours; the dissolved oxygen of the ammoniation reaction tank is less than 0.5mg/L, the dissolved oxygen of the aerobic reaction tank is 4mg/L, the dissolved oxygen of the membrane biological reaction tank is 4mg/L, and the dissolved oxygen of the anoxic reaction tank is less than 0.5 mg/L. The pH value of the ammonification reaction tank is 7, the mechanical stirring speed is 200rpm, the adding amount of the bacillus subtilis is 40mg/L when the ammonification reaction tank is started, and the bacillus subtilis is continuously added by 0.08mg/L after the ammonification reaction tank is normally operated; the pH value of the aerobic reaction tank is 8, the adding amount of 1:1 mixed nitrosomonas and acidobacter is 40mg/L when the aerobic reaction tank is started, and 0.08mg/L of 1:1 mixed nitrosomonas and acidobacter is continuously added after the aerobic reaction tank is normally operated; the pH value of the anoxic reaction tank is 7-8, the mechanical stirring speed is 200rpm, the adding amount of the nitrate reducing bacteria is 40mg/L during starting, and 0.08mg/L of the nitrate reducing bacteria is continuously added after normal operation. After approximately 15 days of start-up, normal operation, the total nitrogen and organic nitrogen treatment results are shown in table 1.
[ example 4 ]
According to the method of example 3, except that the ammoniation reaction tank dissolved oxygen is 1mg/L, the aerobic reaction tank dissolved oxygen is 8mg/L, the membrane biological reaction tank dissolved oxygen is 8mg/L, and the anoxic reaction tank dissolved oxygen is 1 mg/L.
[ example 5 ]
According to the method of example 3, except that the dissolved oxygen in the aerobic reaction tank is 1mg/L, the dissolved oxygen in the membrane biological reaction tank is 1 mg/L.
[ example 6 ]
In the same manner as in example 3 except that the mechanical stirring speeds of the ammonification reaction tank and the anoxic reaction tank were each 500 rpm.
[ example 7 ]
According to the mode of the embodiment 3, the difference is that an ammoniation reaction tank MLSS2000mg/L, an aerobic reaction tank MLSS3000mg/L, a membrane biological reaction tank MLSS3000mg/L and an anoxic reaction tank MLSS2000 mg/L.
[ example 8 ]
According to the mode of the example 3, the difference is that an ammoniation reaction tank MLSS4000mg/L, an aerobic reaction tank MLSS6000mg/L, a membrane biological reaction tank MLSS6000mg/L and an anoxic reaction tank MLSS4000 mg/L.
[ example 9 ]
According to the mode of the embodiment 3, the difference is that an ammoniation reaction tank MLSS1000mg/L, an aerobic reaction tank MLSS2000mg/L, a membrane biological reaction tank MLSS2000mg/L and an anoxic reaction tank MLSS1000 mg/L.
[ example 10 ]
According to the mode of the embodiment 3, different from the ammonification reaction tank MLSS5000mg/L, the aerobic reaction tank MLSS7000mg/L, the membrane biological reaction tank MLSS7000mg/L and the anoxic reaction tank MLSS5000 mg/L.
Comparative example 1
The apparatus of example 1 was followed except that no ammonification reaction tank was provided.
The wastewater to be treated of example 3 was used, and a wastewater denitrification process was carried out:
an aerobic reaction tank with an effective volume of 5 liters, a membrane biological reaction tank with an effective volume of 2.5 liters and an anoxic reaction tank with an effective volume of 5 liters are used in a laboratory to inoculate the same sludge, and the sludge concentration is respectively as follows: the aerobic reaction tank MLSS4000mg/L, the membrane biological reaction tank MLSS4000mg/L and the anoxic reaction tank MLSS3000mg/L, the treatment process runs continuously, and the main working procedures are as follows: the aerobic reaction tank stays for 24 hours, the membrane biological reaction tank stays for 12 hours, and the anoxic reaction tank stays for 12 hours; 2mg/L of dissolved oxygen in the aerobic reaction tank, 2mg/L of dissolved oxygen in the membrane biological reaction tank and less than 0.5mg/L of dissolved oxygen in the anoxic reaction tank. The pH value of the aerobic reaction tank is 8, the adding amount of 1:1 mixed nitrosomonas and acidobacter is 40mg/L when the aerobic reaction tank is started, and 0.08mg/L of 1:1 mixed nitrosomonas and acidobacter is continuously added after the aerobic reaction tank is normally operated; the pH value of the anoxic reaction tank is 7-8, the mechanical stirring speed is 200rpm, the adding amount of the nitrate reducing bacteria is 40mg/L during starting, and 0.08mg/L of the nitrate reducing bacteria is continuously added after normal operation. After approximately 28 days of start-up, normal operation, the total nitrogen and organic nitrogen treatment results are shown in table 1.
Comparative example 2
The apparatus of example 1 was followed except that no aerobic reaction tank was provided.
The wastewater to be treated of example 3 was used, and a wastewater denitrification process was carried out:
in the laboratory, an ammoniation reaction tank with an effective volume of 5 liters, a membrane biological reaction tank with an effective volume of 2.5 liters and an anoxic reaction tank with an effective volume of 5 liters are used for inoculating the same sludge, and the sludge concentration is respectively as follows: the ammonification reaction tank MLSS3000mg/L, the membrane biological reaction tank MLSS4000mg/L and the anoxic reaction tank MLSS3000mg/L, the treatment process runs continuously, and the main working procedures are as follows: the ammonification reaction tank stays for 12 hours, the membrane biological reaction tank stays for 12 hours, and the anoxic reaction tank stays for 12 hours; the dissolved oxygen of the ammoniation reaction tank is less than 0.5mg/L, the dissolved oxygen of the membrane biological reaction tank is 2mg/L, and the dissolved oxygen of the anoxic reaction tank is less than 0.5 mg/L. The pH value of the ammonification reaction tank is 7, the mechanical stirring speed is 200rpm, the adding amount of the bacillus subtilis is 40mg/L when the ammonification reaction tank is started, and the bacillus subtilis is continuously added by 0.08mg/L after the ammonification reaction tank is normally operated; the pH value of the anoxic reaction tank is 7-8, the mechanical stirring speed is 200rpm, the adding amount of the nitrate reducing bacteria is 40mg/L during starting, and 0.08mg/L of the nitrate reducing bacteria is continuously added after normal operation. After approximately 28 days of start-up, normal operation, the total nitrogen and organic nitrogen treatment results are shown in table 1.
Comparative example 3
The apparatus of example 1 was followed except that no anoxic reaction tank was provided.
The wastewater to be treated of example 3 was used, and a wastewater denitrification process was carried out:
in a laboratory, an ammoniation reaction tank with an effective volume of 5 liters, an aerobic reaction tank with an effective volume of 5 liters and a membrane biological reaction tank with an effective volume of 2.5 liters are used for inoculating the same sludge, and the sludge concentration is respectively as follows: the ammonification reaction tank MLSS3000mg/L, the aerobic reaction tank MLSS4000mg/L and the membrane biological reaction tank MLSS4000mg/L, the treatment process runs continuously, and the main working procedures are as follows: the ammonification reaction tank stays for 12 hours, the aerobic reaction tank stays for 24 hours, and the membrane biological reaction tank stays for 12 hours; the dissolved oxygen of the ammoniation reaction tank is less than 0.5mg/L, the dissolved oxygen of the aerobic reaction tank is 2mg/L, the dissolved oxygen of the membrane biological reaction tank is 2mg/L, and the dissolved oxygen of the anoxic reaction tank is less than 0.5 mg/L. The pH value of the ammonification reaction tank is 7, the mechanical stirring speed is 200rpm, the adding amount of the bacillus subtilis is 40mg/L when the ammonification reaction tank is started, and the bacillus subtilis is continuously added by 0.08mg/L after the ammonification reaction tank is normally operated; the pH value of the aerobic reaction tank is 8, the adding amount of 1:1 mixed nitrosomonas and acidomicrobia is 40mg/L when the aerobic reaction tank is started, and 0.08mg/L of 1:1 mixed nitrosomonas and acidomicrobia is continuously added after the aerobic reaction tank is normally operated. After approximately 28 days of start-up, normal operation, the total nitrogen and organic nitrogen treatment results are shown in table 1.
TABLE 1
What has been described above is merely a preferred example of the present invention. It should be noted that other equivalent variations and modifications can be made by those skilled in the art based on the technical teaching provided by the present invention, and the protection scope of the present invention should be considered.
Claims (10)
1. The utility model provides a device for waste water denitrogenation, includes ammoniation reaction tank, aerobic reaction pond, membrane biological reaction pond and the oxygen deficiency reaction tank that communicates in proper order, wherein, ammoniation reaction tank is used for carrying out the ammoniation reaction, aerobic reaction pond is used for carrying out first order nitration reaction and/or nitrosation reaction, membrane biological reaction pond is used for carrying out second order nitration reaction and/or nitrosation reaction, the oxygen deficiency reaction pond is used for carrying out the denitrification reaction.
2. The device as claimed in claim 1, wherein a No. 1 mechanical stirring paddle is arranged in the ammoniation reaction tank; and/or the presence of a gas in the gas,
a No. 1 pH probe and a No. 1 dissolved oxygen probe are arranged in the ammoniation reaction tank; and/or the presence of a gas in the gas,
a pipeline mixer communicated with a dosing pipeline is arranged on the inlet pipeline of the ammoniation reaction tank; and/or the presence of a gas in the gas,
the inlet pipeline of the ammonification reaction tank is communicated with a No. 1 bacteria adding pipeline; and/or the presence of a gas in the gas,
a No. 1 aeration system is arranged in the ammoniation reaction tank; and/or the presence of a gas in the gas,
and a water inlet pump is arranged between the ammoniation reaction tank and the wastewater source.
3. The device as claimed in claim 1 or 2, wherein a vertical partition is arranged in the aerobic reaction tank and used for dividing the interior of the aerobic reaction tank into two reaction zones which are communicated up and down; preferably, a No. 2 aeration system is arranged on one side of the partition plate, which is close to the ammonification reaction tank; preferably, the biological filler is vertically arranged on one side of the clapboard, which is far away from the ammonification reaction tank; and/or the presence of a gas in the gas,
a No. 2 pH probe and a No. 2 dissolved oxygen probe are arranged in the aerobic reaction tank; and/or the presence of a gas in the gas,
and an inlet pipeline of the aerobic reaction tank is communicated with a No. 2 bacteria adding pipeline.
4. The device according to any one of claims 1 to 3, wherein a # 3 aeration system is arranged in the membrane biological reaction tank; and/or the presence of a gas in the gas,
and a flat ultrafiltration membrane is arranged in the membrane biological reaction tank.
5. The device according to any one of claims 1 to 4, wherein a No. 2 mechanical stirring paddle is arranged in the anoxic reaction tank; and/or the presence of a gas in the gas,
a 3# pH probe and a 3# dissolved oxygen probe are arranged in the anoxic reaction tank; and/or the presence of a gas in the gas,
the inlet pipeline of the anoxic reaction tank is communicated with a 3# bacterium adding pipeline; and/or the presence of a gas in the gas,
a No. 4 aeration system is arranged in the anoxic reaction tank; and/or the presence of a gas in the gas,
a suction pump is arranged between the anoxic reaction tank and the membrane biological reaction tank.
6. The device as claimed in any one of claims 1 to 5, wherein the ammonification reaction tank and/or the anoxic reaction tank are/is communicated with a No. 2 blower for providing nitrogen gas; and/or the presence of a gas in the gas,
the aerobic reaction tank and/or the membrane biological reaction tank are/is communicated with the No. 1 fan and are used for providing air and/or pure oxygen; and/or the presence of a gas in the gas,
the bottom of the ammoniation reaction tank, the bottom of the aerobic reaction tank, the bottom of the membrane biological reaction tank and the bottom of the anoxic reaction tank are provided with sludge discharge outlets for irregular sewage discharge; and/or the presence of a gas in the gas,
the sludge in the membrane biological reaction tank flows back to an inlet pipeline of the aerobic reaction tank through a sludge reflux pump; and/or the presence of a gas in the gas,
the device still includes former pond for hold pending waste water, preferably, set up 4# pH probe in the former pond.
7. A wastewater denitrification process, comprising:
(1) the wastewater to be treated enters an ammoniation reaction tank and is subjected to ammoniation reaction to obtain a first effluent;
(2) the first effluent enters an aerobic reaction tank and is subjected to a first-stage nitration reaction and/or a nitrosation reaction to obtain a second effluent;
(3) the second effluent enters a membrane biological reaction tank to carry out a second-stage nitration reaction and/or a nitrosation reaction to obtain a third effluent;
(4) and the fourth effluent enters an anoxic reaction tank for denitrification reaction.
8. The process according to claim 7, wherein the ammonification reaction is performed in the ammonification reaction tank in the presence of activated sludge and powdered activated carbon by adding ammonifying bacteria, preferably, the ammonifying bacteria are at least one selected from the group consisting of Bacillus mycoides, Bacillus subtilis and Bacillus putrescentiae; and/or the presence of a gas in the gas,
the reaction conditions in the ammoniation reaction tank include: the pH value is 7-8; and/or, dissolved oxygen is less than 0.5 mg/L; and/or the mechanical stirring speed is 80-200 rpm; and/or the adding amount of the ammonifying bacteria is 10-50 mg/L when the device is started; and/or the addition amount of the ammonifying bacteria in the normal operation of the device is 0-1 mg/L; and/or the concentration of the activated sludge is 2000-4000 mg/L; and/or the presence of a gas in the gas,
adding nitrobacteria and/or nitrosobacteria in the aerobic reaction tank in the presence of a biological membrane and activated sludge to perform nitration reaction and/or nitrosobacteria reaction, preferably, the bacteria are nitrosomonas and/or acidomicrobium, and more preferably, the dosage ratio of the nitrosomonas to the acidomicrobium is 1: 1-10: 1; and/or the presence of a gas in the gas,
the reaction conditions in the aerobic reaction tank comprise: the pH value is 7.5-8.5; and/or the dissolved oxygen is 2-4 mg/L; and/or the adding amount of the nitrifying bacteria and/or the nitrosobacteria is 10-50 mg/L when the device is started; and/or the addition amount of the nitrifying bacteria and/or the nitrosobacteria in the normal operation of the device is 0-1 mg/L; and/or the concentration of the activated sludge is 3000-6000 mg/L; and/or the presence of a gas in the gas,
the reaction conditions in the membrane biological reaction tank comprise: the dissolved oxygen is 2-4 mg/L; and/or the concentration of the activated sludge is 3000-6000 mg/L; and/or the presence of a gas in the gas,
in the anoxic reaction tank, carrying out denitrification reaction by adding reducing bacteria in the presence of activated sludge and powdered activated carbon, preferably, the reducing bacteria are nitrate reducing bacteria; and/or the presence of a gas in the gas,
the reaction conditions in the anoxic reaction tank include: the pH value is 7-8; and/or, dissolved oxygen is less than 0.5 mg/L; and/or the mechanical stirring speed is 80-200 rpm; and/or the adding amount of the ammonifying bacteria is 10-50 mg/L when the device is started; and/or the addition amount of the ammonifying bacteria in the normal operation of the device is 0-1 mg/L; and/or the concentration of the activated sludge is 2000-4000 mg/L.
9. The process according to claim 7 or 8, wherein the total nitrogen concentration of the wastewater to be treated is 200-800 mg/L; and/or the organic nitrogen content in the wastewater to be treated accounts for more than 90 weight percent of the total nitrogen content; and/or the COD of the wastewater to be treated is 2500-10000 mg/L.
10. Use of the apparatus for denitrification of wastewater according to any one of claims 1-6 or the wastewater denitrification process according to any one of claims 7-9 in wastewater treatment.
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