A coking wastewater BDS total nitrogen removal device and method with stable effluent

Abstract

The application discloses a coking wastewater BDS total nitrogen removal equipment and total nitrogen removal method, which are stable in water outlet. The equipment comprises a wastewater containing pool, a denitrification reaction tower arranged in the wastewater containing pool and a biological desulfurization floating ball. The denitrification reaction tower comprises a reaction tower support shell fixed at the bottom of the wastewater containing pool, and the reaction tower support shell is a vertically extended cylindrical shell structure. An aerobic reaction tank and an anaerobic reaction tank are fixedly arranged in the reaction tower support shell. The aerobic reaction tank is fixedly provided with an adhering support plate, and the adhering support plate is provided with helically extended flow-through grooves. A helical support plate is fixedly arranged on each of the upper side and the lower side of the adhering support plate, and a plurality of microbial adhering plates are fixedly arranged on the side surface of the helical support plate. The equipment has high sulfur and nitrogen removal capacity, can effectively reduce the content of sulfides and nitrogen compounds in coking wastewater, and can efficiently adsorb, oxidize, reduce and remove the sulfur and nitrogen compounds in the wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a BDS (coking wastewater) denitrification device and a denitrification method for coking wastewater with stable effluent. Background Art

[0002] Coking wastewater refers to wastewater generated during the coking process. It primarily originates from processes such as coke oven cooling, coke oven washing, and desulfurization and denitrification. Coking wastewater contains large amounts of harmful substances such as organic matter, heavy metals, cyanide, and ammonia nitrogen. These harmful substances can be directly discharged into water bodies, causing water pollution. This can be toxic to aquatic organisms, disrupt the balance of aquatic ecosystems, and impact the sustainable use of water bodies. If untreated, coking wastewater is discharged directly or seeps into the soil, it can cause soil pollution. Harmful substances such as organic matter and heavy metals can accumulate in the soil, and excessive wastewater can negatively impact crop growth and soil quality. Coking wastewater contains high levels of ammonia nitrogen. If the ammonia nitrogen is not effectively removed during treatment, it can enter the atmosphere through evaporation or volatilization, causing air pollution. Volatile organic compounds, produced by the reaction of ammonia nitrogen with organic matter in the air, are typical ozone precursors, exacerbating air pollution and posing a health hazard. Improper discharge and treatment of coking wastewater can also have long-term and widespread impacts on the surrounding ecological environment. Harmful substances can enter aquatic organisms, terrestrial plants, animals, and other organisms, where they can be further transferred and spread, threatening the health of the ecosystem.

[0003] Therefore, in order to reduce the hazards of coking wastewater, appropriate treatment technologies and measures must be adopted to purify coking wastewater and ensure that its discharge meets national and local environmental protection standards. Summary of the Invention

[0004] The object of the present invention is to provide a BDS denitrification device and a denitrification method for coking wastewater with stable effluent, which can effectively remove nitrogen and phosphorus in coking wastewater.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A BDS total nitrogen removal device for coking wastewater with stable effluent comprises a wastewater holding tank, a denitrification reaction tower arranged in the wastewater holding tank, and a biological desulfurization float;

[0007] The wastewater holding tank is a cement tank with an opening facing upwards;

[0008] The denitrification reaction tower includes a reaction tower support shell fixed to the bottom of the wastewater holding tank, and the reaction tower support shell is a vertically extending cylindrical shell structure;

[0009] An aerobic reaction tank and an anaerobic reaction tank are fixedly arranged in the reaction tower support shell, and the aerobic reaction tank is connected to the anaerobic reaction tank through a pipeline;

[0010] An attachment support plate is fixed in the aerobic reaction tank, and a spirally extending flow slot is provided on the attachment support plate. A spiral support plate is fixed on each of the upper and lower sides of the attachment support plate, and multiple microorganism attachment plates are fixed on the side of the spiral support plate.

[0011] A plurality of vertically extending membrane filter element support tubes are fixedly provided in the anaerobic reaction tank. The side wall of the membrane filter element support tube is a porous hollow structure communicating with the inside and outside. A layer of microfiltration semi-permeable membrane is fixedly provided on the outer wall of the membrane filter element support tube.

[0012] The biological desulfurization float comprises an outer float shell and an inner float shell fixed in the outer float shell;

[0013] The outer spherical shell of the float ball and the inner spherical shell of the float ball are arranged concentrically, and a desulfurization accommodation space is formed between the outer side wall of the inner spherical shell of the float ball and the inner side wall of the outer spherical shell of the float ball;

[0014] A plurality of return support tubes extending radially are fixedly provided on the outer side wall of the inner spherical shell of the float, a spiral attachment support plate extending spirally along the axis thereof is fixedly provided on the outer side of the return support tube, and a plurality of attachment support sheets are fixedly provided on the side wall of the spiral attachment support plate;

[0015] The anaerobic reaction tank is connected with the desulfurization containing space through a pipeline.

[0016] Preferably, an aerobic tank input pipe connected to the interior of the aerobic reaction tank is fixedly provided on the top of the aerobic reaction tank, an aerobic tank output pipe connected to the interior of the aerobic reaction tank is fixedly provided on the bottom of the aerobic reaction tank, an anaerobic tank input pipe connected to the interior of the anaerobic reaction tank is fixedly provided on the top of the anaerobic reaction tank, an anaerobic tank output pipe connected to the interior of the anaerobic reaction tank is fixedly provided on the bottom of the anaerobic reaction tank, and the aerobic tank output pipe is connected to the anaerobic tank input pipe through a pipeline;

[0017] The anaerobic tank input pipe is connected to a vacuum deoxidation mechanism, which includes a vertically placed deoxidation containing pipe with sealed structures at both ends. A deoxidation drive piston is slidably fitted inside the deoxidation containing pipe.

[0018] A deoxidation inlet pipe and a deoxidation outlet pipe are fixedly provided on the outer wall of the deoxidation containing pipe near the bottom thereof, the deoxidation inlet pipe is provided with a first valve, and the deoxidation outlet pipe is provided with a second valve;

[0019] A piston driving connecting rod is fixedly connected to the deoxidation driving piston;

[0020] A piston-driven housing tube is fixedly provided on the top of the deoxidation housing tube, and a piston-driven telescopic rod is fixedly provided inside the piston-driven housing tube. The piston-driven telescopic rod is an electrically controlled telescopic rod, and the outer rod end of the piston-driven telescopic rod is fixedly connected to the inner side wall of the piston-driven housing tube, and the other end of the piston-driven connecting rod extends into the piston-driven housing tube and is fixedly connected to the inner rod of the piston-driven telescopic rod.

[0021] Description: The use of vacuum deoxidation mechanism facilitates the more thorough removal of dissolved gases in coking wastewater.

[0022] Preferably, a microorganism reattachment mechanism is provided in the aerobic reaction tank, and the microorganism reattachment mechanism includes a reattachment mechanism support plate fixedly connected to the inner side wall of the aerobic reaction tank, a radial support slide rail is fixedly provided on the reattachment mechanism support plate, a radial support slider is slidably provided on the radial support slide rail, a vertically extending axial support column is fixedly provided on the radial support slider, and an attachment output tube is fixedly provided at the other end of the axial support column;

[0023] The side wall of the attached output pipe is provided with a plurality of through holes communicating with the inside and outside;

[0024] The radial support slide block is driven by a servo motor to move along the radial support slide rail.

[0025] Description: The microbial reattachment mechanism is used to facilitate coating the culture solution of aerobic bacteria on the microbial attachment plate, inputting the aerobic bacteria into the attachment output tube, and the aerobic bacteria in the attachment output tube are discharged from the through holes on the side wall and attached to the microbial attachment plate.

[0026] Preferably, an annular circumferential support slide rail is fixedly connected to the inner side wall of the aerobic reaction tank, a circumferential support ring is rotatably connected to the circumferential support slide rail, and the reattachment mechanism support plate is fixedly connected to the inner side of the circumferential support ring;

[0027] The circumferential support ring is driven by a servo motor to rotate around the axis of the circumferential support slide rail.

[0028] Description: It is convenient to make the attachment output tube move around the path of the spiral support plate and coat the aerobic bacteria on the microorganism attachment plate.

[0029] Preferably, a circulation mechanism is provided at the bottom of the aerobic reaction tank, and the circulation mechanism includes a circulation circulation shell. The circulation circulation shell is a trumpet-shaped shell structure. The larger opening end of the circulation circulation shell is fixedly connected to the bottom of the aerobic reaction tank. A circulation shaft accommodating shell is fixedly provided in the circulation circulation shell. A circulation drive shaft is fixedly connected to the top of the circulation shaft accommodating shell. Circulation drive blades are fixedly provided on the circulation drive shaft. A motor for driving the circulation drive shaft to rotate is provided in the circulation shaft accommodating shell. A plurality of circulation input connecting holes communicating with the inside and outside are provided on the side wall of the circulation circulation shell.

[0030] Explanation: The circulation mechanism promotes the flow of water in the aerobic reaction tank, so that the coking wastewater fully contacts the aerobic bacteria on the microbial attachment plate.

[0031] Preferably, the anaerobic reaction tank is provided with a membrane flushing mechanism, the membrane flushing mechanism comprising a plurality of flushing lifting support slides fixed on the inner side wall of the anaerobic reaction tank, a flushing lifting support slide block is slidably connected on the flushing lifting support slide, a plurality of flushing support plates are fixedly connected on the flushing lifting support slide block, a plurality of through holes are formed in the flushing support plate, and a membrane filter core support pipe is arranged in the through hole in one-to-one correspondence.

[0032] The flushing support plate is a hollow structure with through holes on both sides.

[0033] A flushing support ring is fixedly arranged at the through hole, and a plurality of flushing nozzles are fixedly arranged on the inner side of the flushing support ring.

[0034] Explanation: The membrane flushing mechanism is used to periodically flush the microfiltration semi-permeable membrane to maintain the filtration performance of the microfiltration semi-permeable membrane.

[0035] Preferably, the spiral attachment support plate side wall is provided with a microbial arrangement mechanism, the microbial arrangement mechanism comprising a biological arrangement support slide fixed on the spiral attachment support plate side wall, a biological arrangement support slide block slidably arranged on the biological arrangement support slide, a vertical biological arrangement support column fixedly connected on the biological arrangement support slide block, a plurality of biological arrangement pipes radially extending on the biological arrangement support column, and a plurality of through holes on the side wall of the biological arrangement pipe.

[0036] Each two biological arrangement pipes form a group, and the attachment support piece is arranged in the biological arrangement pipe in one-to-one correspondence during work.

[0037] Explanation: The microbial arrangement mechanism is used to coat and arrange sulfur bacteria on the surface of each attachment support piece. The sulfur bacteria are introduced into each biological arrangement pipe, and the sulfur bacteria in the biological arrangement pipe are discharged from the through holes on the side wall and attached to the attachment support piece.

[0038] Preferably, a plurality of circulating drainage shells are fixedly arranged on the inner side wall of the floating ball outer shell, the circulating drainage shell is a disc-shaped shell structure, the outer side of the circulating drainage shell has a plurality of internal and external communication circulating drainage holes, and the return flow support pipe is connected to the inside of the circulating drainage shell through a circulating communication pipe.

[0039] The return flow support pipe side wall has a plurality of internal and external communication through holes;

[0040] A circulating drive water pump is fixedly arranged in the circulating communication pipe, the input end of the circulating drive water pump is connected to the side close to the return flow support pipe, and the output end of the circulating drive water pump is connected to the side close to the circulating drainage shell.

[0041] Description: Coking wastewater enters the reflux support pipe through the through hole on the side wall of the reflux support pipe. Under the conveying action of the circulation drive water pump, the coking wastewater inside the reflux support pipe enters the circulation drainage shell and is then discharged from the circulation drainage hole, promoting the circulation of coking wastewater in the desulfurization accommodation space, so that the coking wastewater can fully contact with the sulfur bacteria on the attached support sheet.

[0042] Preferably, the method for treating coking wastewater using the above-mentioned BDS total nitrogen removal equipment for coking wastewater with stable effluent comprises the following steps:

[0043] S1. First, the coking wastewater is subjected to static sedimentation and filtration treatment to remove solid precipitation and suspended matter in the coking wastewater;

[0044] S2. The filtered coking wastewater is transported to a wastewater holding tank, wherein a water delivery pump is provided in the wastewater holding tank. The water delivery pump delivers the coking wastewater to an aerobic reaction tank through a pipeline;

[0045] According to 0.2~0.6g / cm 2 The aerobic bacteria are attached to the microbial attachment plate and the aerobic bacteria are used to perform aerobic nitrogen removal reaction on the coking wastewater in the aerobic reaction tank;

[0046] The dissolved oxygen of the coking wastewater in the aerobic reaction tank is controlled at 0.3-2 mg / L, the water temperature is controlled at 25-31°C, and the pH value is controlled at 6.8-7.3;

[0047] Aerobic bacteria include Nitrobacter, Nitrococcus, Nitrosomonas, Nitrosospira, and Nitrospira.

[0048] The culture solution of aerobic bacteria is coated on the microbial attachment plate by using the microbial reattachment mechanism, and the aerobic bacteria are input into the attachment output tube. The aerobic bacteria in the attachment output tube are discharged from the through holes on the side wall and attached to the microbial attachment plate.

[0049] The servo motor drives the circumferential support to rotate around the axis of the circumferential support slide rail, and the circumferential support ring drives the reattachment mechanism support plate and the attachment output tube to move together. The servo motor drives the radial support slider to move along the radial support slide rail, and the radial support slider drives the axial support column and the attachment output tube to move together, so that the attachment output tube moves around the path of the spiral support plate and coats the aerobic bacteria on the microbial attachment plate.

[0050] The circulation mechanism is used to promote the flow of water in the aerobic reaction tank, so that the coking wastewater is fully in contact with the aerobic bacteria on the microbial attachment plate. The coking wastewater enters the circulation shell from each circulation input connection hole, and is driven by the circulation drive blades to be discharged from the top of the circulation shell from bottom to top.

[0051] S3, transport the coking wastewater after aerobic denitrification reaction to the anaerobic reaction tank, according to 5000 ~ 8000g / m 3 The anaerobic bacteria are added into the anaerobic reaction tank, and the anaerobic bacteria are used in the anaerobic reaction tank to perform anaerobic nitrogen removal reaction on the coking wastewater;

[0052] The dissolved oxygen of the coking wastewater in the anaerobic reaction tank is controlled at 0.02-0.1 mg / L, the water temperature is controlled at 30-36°C, and the pH value is controlled at 6.5-7.1;

[0053] Anaerobic bacteria include Pseudomonas, Alcaligenes, Neisseriaceae, Rhodospirillaceae, Bacillaceae, and Cellulomyxaceae.

[0054] After anaerobic nitrogen removal, the coking wastewater is filtered using a microfiltration semi-permeable membrane. The filtered coking wastewater enters the permeable membrane filter support tube and is discharged through the pipeline.

[0055] The membrane flushing mechanism is used to regularly flush the microfiltration semipermeable membrane to maintain the filtration performance of the microfiltration semipermeable membrane. After the water in the anaerobic reaction tank is drained, cleaning water is introduced into multiple flushing nozzles. The water flow ejected from the flushing nozzles is used to clean the surface of the microfiltration semipermeable membrane. The flushing lifting support slider is driven by a servo motor to move along the flushing lifting support slide rail. The flushing lifting support slider drives the entire flushing support plate to move up and down, so that the flushing nozzles can fully clean all parts of the microfiltration semipermeable membrane.

[0056] The coking wastewater discharged from the aerobic reaction tank is first vacuum deoxygenated using a vacuum deoxygenation mechanism and then transported to the anaerobic reaction tank. Specifically, the coking wastewater after the aerobic denitrification reaction in the aerobic reaction tank is discharged through the aerobic tank output pipe and then enters the deoxygenation holding pipe through the deoxygenation input pipe, and the water level in the deoxygenation holding pipe is controlled to be below the deoxygenation output pipe;

[0057] After the injection of the coking wastewater into the deoxidation holding pipe is completed, the first valve and the second valve are closed;

[0058] The piston drives the inner rod of the telescopic rod to retract, and the piston drives the connecting rod to drive the deoxidation drive piston to move upward, so that a negative pressure vacuum area is formed in the space above the coking wastewater. The gas dissolved in the coking wastewater will precipitate and rise to gather above the coking wastewater. Then, the deoxidation drive piston is quickly driven downward and falls back. The second valve is opened separately to discharge the precipitated gas, and the second valve is closed again. Only a small amount of gas dissolves again on the surface of the coking wastewater, and most of the precipitated gas is discharged from the deoxidation output pipe, completing the deoxidation treatment of the coking wastewater.

[0059] S4, transport the coking wastewater after anaerobic nitrogen removal to the desulfurization holding space, according to 0.3 ~ 0.8g / cm 2The sulfur bacteria are attached to the attachment support sheet and the coking wastewater is desulfurized by using the sulfiding bacteria;

[0060] The dissolved oxygen of the coking wastewater in the desulfurization accommodation space is controlled at 3-5 mg / L, the water temperature is controlled at 27-33°C, and the pH value is controlled at 6.6-6.9.

[0061] Sulfur bacteria include Thiobacillus thiooxidans and Thiobacillus ferrooxidans.

[0062] The sulfur bacteria are coated and arranged on the surface of each attachment support sheet using a microbial arrangement mechanism, and the sulfur bacteria are introduced into each biological arrangement tube. The sulfur bacteria in the biological arrangement tube are discharged from the through holes on the side walls and attached to the attachment support sheet. The biological arrangement support slider is driven by a servo motor to move along the biological arrangement support slide rail. The biological arrangement support slider drives the biological arrangement support column and the multiple biological arrangement tubes to move together, so that the biological arrangement tubes move along the path of the spiral attachment support plate and coat the sulfur bacteria on the surface of each attachment support sheet.

[0063] There are multiple through holes communicating with each other inside and outside on the side wall of the reflux support pipe. The coking wastewater enters the reflux support pipe through the through holes on the side wall of the reflux support pipe. Under the conveying action of the circulation driving water pump, the coking wastewater inside the reflux support pipe enters the circulation drainage shell and is then discharged from the circulation drainage hole, which promotes the circulation of the coking wastewater in the desulfurization accommodation space and allows the coking wastewater to fully contact the sulfur bacteria on the attached support sheet.

[0064] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0065] 1. The equipment of the present invention has high-efficiency sulfur and nitrogen removal capabilities, can effectively reduce the sulfide and nitride content in coking wastewater, and can efficiently adsorb, oxidize, reduce and remove sulfur and nitride in wastewater;

[0066] 2. The equipment of the present invention has a high degree of safety and reliability, can prevent the leakage of harmful substances in wastewater, ensure the safety of operators and the environment, and ensure the long-term stable operation of the equipment;

[0067] 3. The equipment of the present invention is adaptable to the treatment of coking wastewater of different scales and concentrations, has good adaptability and stability, can adapt to different water quality and treatment conditions, and maintains continuous and efficient treatment effects;

[0068] 4. The equipment of the present invention has good energy conservation and environmental protection, and has the characteristics of low energy consumption and efficient use of energy, while reducing the emission of gases such as sulfur dioxide and nitrogen oxides, and meeting environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 is a front view of the wastewater holding tank of the present invention;

[0070] Figure 2 yes Figure 1 A top view of

[0071] Figure 3 It is a structural schematic diagram of the aerobic reaction tank of the present invention;

[0072] Figure 4 yes Figure 3 A top view of

[0073] Figure 5 It is a structural schematic diagram of the anaerobic reaction tank of the present invention;

[0074] Figure 6 1 is a top view of the support tube of the membrane filter element of the present invention;

[0075] Figure 7 yes Figure 5 A top view of

[0076] Figure 8 It is a structural schematic diagram of the vacuum deoxidation mechanism of the present invention;

[0077] Figure 9 This is a schematic structural diagram of the biological desulfurization float of the present invention;

[0078] Figure 10 yes Figure 9 Partial view A.

[0079] In the figure, 10-wastewater holding tank, 20-denitrification reaction tower, 21-reaction tower support shell, 22-aerobic reaction tank, 221-attachment support plate, 222-circulation slot, 223-spiral support plate, 224-microorganism attachment plate, 23-anaerobic reaction tank, 231-membrane filter element support tube, 232-microfiltration semipermeable membrane, 24-vacuum deoxygenation mechanism, 241-deoxygenation holding tube, 242-deoxygenation drive piston, 243-deoxygenation input pipe, 244-deoxygenation output pipe, 245-first valve, 246-second valve, 247-piston drive connecting rod, 248-piston drive receiving tube, 249-piston drive telescopic rod, 25-membrane flushing mechanism, 251-flushing lifting support slide rail, 252-flushing lifting support slider, 253-flushing support plate, 254-through-stretching matching hole, 255-flushing support ring, 256-flushing nozzle, 30-biological desulfurization float, 300-desulfurization accommodation space, 31-float outer spherical shell, 32-float inner spherical shell, 330-reflux support pipe, 33-spiral attachment support plate, 331-attachment support sheet, 34-microorganism arrangement mechanism, 341-biological arrangement support slide rail, 342-biological arrangement support slider, 343-biological arrangement support column, 344-biological arrangement pipe, 35-circulation drainage shell, 351-circulation drainage hole, 352-circulation connecting pipe, 353-circulation drive water pump, 41-microorganism reattachment mechanism, 411-reattachment mechanism support plate, 412-radial support slide rail, 413-radial support slider, 414-axial support column, 415-attachment output pipe, 416-circumferential support slide rail, 417-circumferential support ring, 42-circulation circulation mechanism, 421-circulation circulation outer shell, 422-circulation shaft accommodation shell, 423-circulation drive shaft, 424-circulation drive blade. DETAILED DESCRIPTION

[0080] The following combination Figures 1-9 The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front and back directions mentioned below are consistent with the up, down, left, right, front and back directions of the projection relationship of each main view or structural schematic diagram itself.

[0081] Example 1:

[0082] A BDS total nitrogen removal equipment for coking wastewater with stable effluent, such as Figure 1 As shown, it includes a wastewater holding tank 10, a denitrification reaction tower 20 and a biological desulfurization float 30 arranged in the wastewater holding tank 10;

[0083] The wastewater holding tank 10 is a cement tank with an upward opening;

[0084] The denitrification reaction tower 20 includes a reaction tower support shell 21 fixed to the bottom of the wastewater holding tank 10. The reaction tower support shell 21 is a vertically extending cylindrical shell structure.

[0085] An aerobic reaction tank 22 and an anaerobic reaction tank 23 are fixedly installed in the reaction tower support shell 21. The aerobic reaction tank 22 is connected to the anaerobic reaction tank 23 through a pipeline.

[0086] An aerobic tank input pipe 220 is fixedly provided at the top of the aerobic reaction tank 22 and is connected to the interior thereof. An aerobic tank output pipe 229 is fixedly provided at the bottom of the aerobic reaction tank 22 and is connected to the interior thereof. An anaerobic tank input pipe 230 is fixedly provided at the top of the anaerobic reaction tank 23 and is connected to the interior thereof. An anaerobic tank output pipe 239 is fixedly provided at the bottom of the anaerobic reaction tank 23 and is connected to the interior thereof. The aerobic tank output pipe 229 is connected to the anaerobic tank input pipe 230 via a pipeline.

[0087] like Figure 1 As shown, the anaerobic tank input pipe 230 is connected to a vacuum deoxidation mechanism 24. Figure 8 As shown, the vacuum deoxidation mechanism 24 includes a vertically placed deoxidation containing tube 241. Both ends of the deoxidation containing tube 241 are sealed structures. A deoxidation driving piston 242 is slidably provided in the deoxidation containing tube 241.

[0088] A deoxidation inlet pipe 243 and a deoxidation outlet pipe 244 are fixedly provided on the outer wall of the deoxidation container pipe 241 near the bottom thereof. The deoxidation inlet pipe 243 has a first valve 245, and the deoxidation outlet pipe 244 has a second valve 246.

[0089] A piston driving connecting rod 247 is fixedly connected to the deoxidation driving piston 242;

[0090] A piston drive housing tube 248 is fixedly provided on the top of the deoxidation housing tube 241, and a piston drive telescopic rod 249 is fixedly provided inside the piston drive housing tube 248. The piston drive telescopic rod 249 is an electrically controlled telescopic rod. The outer rod end of the piston drive telescopic rod 249 is fixedly connected to the inner side wall of the piston drive housing tube 248, and the other end of the piston drive connecting rod 247 extends into the piston drive housing tube 248 and is fixedly connected to the inner rod of the piston drive telescopic rod 249.

[0091] The deoxygenation input pipe 243 is connected to the aerobic tank output pipe 229 through a pipeline;

[0092] A delivery pump is fixedly provided at the bottom of the deoxidation containment pipe 241, and the output end of the delivery pump is connected to the anaerobic tank input pipe 230 through a pipeline;

[0093] like Figure 3As shown, an attachment support plate 221 is fixedly provided in the aerobic reaction tank 22. The attachment support plate 221 has a spirally extending flow slot 222. A spiral support plate 223 is fixedly provided on the upper and lower sides of the attachment support plate 221. A plurality of microorganism attachment plates 224 are fixedly provided on the side of the spiral support plate 223.

[0094] like Figure 3 As shown, a microorganism reattachment mechanism 41 is provided in the aerobic reaction tank 22. The microorganism reattachment mechanism 41 includes a reattachment mechanism support plate 411 fixedly connected to the inner wall of the aerobic reaction tank 22. A radial support rail 412 is fixedly provided on the reattachment mechanism support plate 411. A radial support slider 413 is slidably provided on the radial support rail 412. A vertically extending axial support column 414 is fixedly provided on the radial support slider 413. An attachment output tube 415 is fixedly provided at the other end of the axial support column 414.

[0095] The side wall of the attached output tube 415 has a plurality of through holes communicating with each other inside and outside;

[0096] The radial support slider 413 is driven by a servo motor to move along the radial support rail 412 .

[0097] An annular circumferential support rail 416 is fixedly connected to the inner wall of the aerobic reaction tank 22. A circumferential support ring 417 is rotatably connected to the circumferential support rail 416. The reattachment mechanism support plate 411 is fixedly connected to the inner side of the circumferential support ring 417.

[0098] The circumferential support ring 417 is driven by a servo motor to rotate around the axis of the circumferential support slide rail 416 .

[0099] like Figure 3 As shown, a circulation mechanism 42 is provided at the bottom of the aerobic reaction tank 22, and the circulation mechanism 42 includes a circulation circulation shell 421. The circulation circulation shell 421 is a trumpet-shaped shell structure, and the larger opening end of the circulation circulation shell 421 is fixedly connected to the bottom of the aerobic reaction tank 22. A circulation shaft accommodating shell 422 is fixedly provided in the circulation circulation shell 421, and a circulation drive shaft 423 is fixedly connected to the top of the circulation shaft accommodating shell 422. Circulation drive blades 424 are fixedly provided on the circulation drive shaft 423. A motor for driving the circulation drive shaft 423 to rotate is provided in the circulation shaft accommodating shell 422, and a plurality of circulation input connecting holes 420 communicating with the inside and outside are provided on the side wall of the circulation circulation shell 421.

[0100] A plurality of vertically extending permeable membrane filter support tubes 231 are fixedly installed in the anaerobic reaction tank 23. The side wall of the permeable membrane filter support tube 231 is a porous hollow structure communicating with the inside and outside. A layer of microfiltration semi-permeable membrane 232 is fixedly installed on the outer wall of the permeable membrane filter support tube 231.

[0101] like Figure 5As shown, the anaerobic reaction tank 23 is provided with a membrane flushing mechanism 25, as shown in FIG. Figure 7 As shown, the membrane flushing mechanism 25 includes a plurality of flushing lifting support rails 251 fixed to the inner wall of the anaerobic reaction tank 23. A flushing lifting support slider 252 is slidably connected to the flushing lifting support rails 251. A flushing support plate 253 is fixedly connected to the plurality of flushing lifting support sliders 252. The flushing support plate 253 has a plurality of through-and-through fitting holes 254, and the membrane filter element support tubes 231 are respectively located in the through-and-through fitting holes 254.

[0102] The flushing support plate 253 is a hollow structure with two sides passing through;

[0103] A flushing support ring 255 is fixedly provided at the through-fitting hole 254 , and a plurality of flushing nozzles 256 are fixedly provided inside the flushing support ring 255 .

[0104] like Figure 9 As shown, the biodesulfurization float 30 includes an outer float shell 31 and an inner float shell 32 fixed in the outer float shell 31;

[0105] The outer spherical shell 31 of the float ball is concentrically arranged with the inner spherical shell 32 of the float ball, and a desulfurization accommodation space 300 is formed between the outer side wall of the inner spherical shell 32 of the float ball and the inner side wall of the outer spherical shell 31 of the float ball;

[0106] like Figure 10 As shown, a plurality of return support tubes 330 extending radially are fixedly provided on the outer side wall of the inner spherical shell 32 of the float, a spiral attachment support plate 33 extending spirally along its axis is fixedly provided on the outer side of the return support tube 330, and a plurality of attachment support plates 331 are fixedly provided on the side wall of the spiral attachment support plate 33;

[0107] The anaerobic reaction tank 23 is connected to the desulfurization accommodation space 300 through a pipeline.

[0108] like Figure 10 As shown, a microorganism placement mechanism 34 is provided on the side wall of the spiral attachment support plate 33. The microorganism placement mechanism 34 includes a biological placement support rail 341 fixed to the side wall of the spiral attachment support plate 33. A biological placement support slider 342 is slidably fitted on the biological placement support rail 341. A vertically extending biological placement support column 343 is fixedly connected to the biological placement support slider 342. A plurality of biological placement tubes 344 extending radially thereof are fixedly provided on the biological placement support column 343. The side wall of the biological placement tube 344 has a plurality of through holes communicating with the inside and outside.

[0109] Every two biological arrangement tubes 344 form a group, and during operation, the attached support pieces 331 are located in each group of biological arrangement tubes 344 in a one-to-one correspondence.

[0110] like Figure 10As shown, the inner side wall of the floating ball outer shell 31 is fixed with a plurality of circulating drainage shells 35, the circulating drainage shell 35 is a disc-shaped shell structure, the outer side of the circulating drainage shell 35 has a plurality of circulating drainage holes 351 which are communicated with the inside and outside, and the reflux support pipe 330 is communicated with the inside of the circulating drainage shell 35 through a circulating communication pipe 352;

[0111] The side wall of the reflux support pipe 330 has a plurality of through holes which are communicated with the inside and outside;

[0112] The circulating communication pipe 352 is fixedly provided with a circulating drive water pump 353, the input end of the circulating drive water pump 353 is communicated with one side close to the reflux support pipe 330, and the output end of the circulating drive water pump 353 is communicated with one side close to the circulating drainage shell 35.

[0113] Embodiment 2:

[0114] The method for treating coking wastewater based on the above-mentioned coking wastewater BDS total nitrogen removal equipment with stable water outlet includes the following steps:

[0115] S1, first, the coking wastewater is subjected to standing and sedimentation and filtration treatment to remove solid sediments and suspended solids in the coking wastewater;

[0116] S2, the coking wastewater after the filtration treatment is sent to the wastewater containing pool 10, the wastewater containing pool 10 is provided with a conveying water pump, and the conveying water pump conveys the coking wastewater to the aerobic reaction tank 22 through a pipeline;

[0117] According to the dosing amount of 0.6g / cm 2 , the aerobic bacteria are attached to the microbial attachment plate 224, and the aerobic bacteria are used to perform the aerobic nitrogen removal reaction on the coking wastewater in the aerobic reaction tank 22;

[0118] The dissolved oxygen of the coking wastewater in the aerobic reaction tank 22 is controlled to be 2mg / L, the water temperature is controlled to be 31℃, and the pH value is controlled to be 7.3;

[0119] The aerobic bacteria are mixed by the nitrifying bacillus, the nitrifying coccus, the nitrosomonadaceae, the nitrosospira, and the nitrosospira in a mass ratio of 1:1:1:1:1.

[0120] The culture solution of the aerobic bacteria is coated on the microbial attachment plate 224 by using the microbial reattachment mechanism 41, the aerobic bacteria are input into the attachment output pipe 415, and the aerobic bacteria in the attachment output pipe 415 are discharged from the through holes in the side wall and attached to the microbial attachment plate 224;

[0121] The servo motor drives the circumferential support ring 417 to rotate around the axis of the circumferential support slide 416. The circumferential support ring 417 drives the reattachment mechanism support plate 411 to move together with the attachment output tube 415. The servo motor drives the radial support slider 413 to move along the radial support slide 412. The radial support slider 413 drives the axial support column 414 to move together with the attachment output tube 415, so that the attachment output tube 415 moves around the path of the spiral support plate 223 and coats the aerobic bacteria on the microorganism attachment plate 224.

[0122] The circulation mechanism 42 is used to promote the flow of water in the aerobic reaction tank 22, so that the coking wastewater is fully in contact with the aerobic bacteria on the microbial attachment plate 224. The coking wastewater enters the interior of the circulation circulation housing 421 through each circulation input communication hole 420, and is driven by the circulation drive blades 424 to be discharged from the top of the circulation circulation housing 421 from the bottom to the top.

[0123] S3, the coking wastewater after aerobic nitrogen removal reaction is transported to the anaerobic reaction tank 23, and the 3 The anaerobic bacteria are added into the anaerobic reaction tank 23, and the anaerobic bacteria are used in the anaerobic reaction tank 23 to perform anaerobic nitrogen removal reaction on the coking wastewater;

[0124] The dissolved oxygen of the coking wastewater in the anaerobic reaction tank 23 is controlled at 0.1 mg / L, the water temperature is controlled at 36°C, and the pH value is controlled at 7.1;

[0125] The anaerobic bacteria are mixed with Pseudomonas, Alcaligenes, Neisseriaceae, Rhodospirillaceae, Bacillaceae and Cellulomyxaceae in a mass ratio of 1:1:1:1:1:1:1.

[0126] After anaerobic nitrogen removal, the coking wastewater is filtered by a microfiltration semi-permeable membrane 232. The filtered coking wastewater enters the membrane filter support tube 231 and is discharged through a pipeline.

[0127] The microfiltration semipermeable membrane 232 is regularly flushed by the membrane flushing mechanism 25 to maintain the filtering performance of the microfiltration semipermeable membrane 232. After the water in the anaerobic reaction tank 23 is drained, washing water is introduced into the multiple flushing nozzles 256. The water flow ejected by the flushing nozzles 256 cleans the surface of the microfiltration semipermeable membrane 232. The flushing lifting support slider 252 is driven by a servo motor to move along the flushing lifting support slide rail 251. The flushing lifting support slider 252 drives the entire flushing support plate 253 to move up and down, so that the flushing nozzles 256 can fully clean all parts of the microfiltration semipermeable membrane 232.

[0128] The coking wastewater discharged from the aerobic reaction tank 22 is first vacuum deoxygenated by the vacuum deoxygenation mechanism 24 and then transported to the anaerobic reaction tank 23. Specifically, the coking wastewater after the aerobic denitrification reaction in the aerobic reaction tank 22 is discharged through the aerobic tank output pipe 229 and then enters the deoxygenation holding pipe 241 through the deoxygenation input pipe 243. The water level in the deoxygenation holding pipe 241 is controlled to be below the deoxygenation output pipe 244.

[0129] After the injection of the coking wastewater into the deoxidation holding pipe 241 is completed, the first valve 245 and the second valve 246 are closed;

[0130] The inner rod of the piston-driven telescopic rod 249 is retracted, and the piston-driven connecting rod 247 drives the deoxidation driving piston 242 to move upward, so that a negative pressure vacuum area is formed in the space above the coking wastewater. The gas dissolved in the coking wastewater will precipitate and rise to gather above the coking wastewater. Then, the deoxidation driving piston 242 is quickly driven downward and falls back. The second valve 246 is opened separately to discharge the precipitated gas, and the second valve 246 is closed again. Only a small amount of gas dissolves again on the surface of the coking wastewater, and most of the precipitated gas is discharged from the deoxidation output pipe 244, completing the deoxidation treatment of the coking wastewater.

[0131] S4, transport the coking wastewater after anaerobic nitrogen removal to the desulfurization accommodation space 300, according to 0.8g / cm 2 The sulfur bacteria are attached to the attachment support sheet 331 and the coking wastewater is desulfurized by using the sulfide bacteria;

[0132] The dissolved oxygen of the coking wastewater in the desulfurization accommodation space 300 is controlled to 5 mg / L, the water temperature is controlled to 33° C., and the pH value is controlled to 6.9.

[0133] The sulfur bacteria are prepared by mixing Thiobacillus thiooxidans and Thiobacillus ferrooxidans in a mass ratio of 1:1.

[0134] The sulfur bacteria are coated and arranged on the surface of each attachment support sheet 331 using the microbial arrangement mechanism 34. The sulfur bacteria are introduced into each biological arrangement tube 344. The sulfur bacteria in the biological arrangement tube 344 are discharged from the through holes on the side wall and attached to the attachment support sheet 331. The biological arrangement support slider 342 is driven by a servo motor to move along the biological arrangement support slide rail 341. The biological arrangement support slider 342 drives the biological arrangement support column 343 and the multiple biological arrangement tubes 344 to move together, so that the biological arrangement tubes 344 move along the path of the spiral attachment support plate 33 and coat the sulfur bacteria on the surface of each attachment support sheet 331.

[0135] The side wall of the reflux support pipe 330 has multiple through holes communicating with the inside and outside. The coking wastewater enters the reflux support pipe 330 through the through holes on the side wall of the reflux support pipe 330. Under the conveying action of the circulating drive water pump 353, the coking wastewater inside the reflux support pipe 330 enters the circulating drainage shell 35 and is then discharged from the circulating drainage hole 351, promoting the circulation of the coking wastewater in the desulfurization accommodation space 300, so that the coking wastewater can fully contact the sulfur bacteria on the attached support sheet 331.

[0136] Example 3:

[0137] The difference from Example 2 is that in step S2, the 2 The aerobic bacteria are attached to the microorganism attachment plate 224, and the aerobic bacteria are used to perform aerobic nitrogen removal reaction on the coking wastewater in the aerobic reaction tank 22;

[0138] The dissolved oxygen of the coking wastewater in the aerobic reaction tank 22 is controlled at 0.3 mg / L, the water temperature is controlled at 25°C, and the pH value is controlled at 6.8;

[0139] In step S3, according to 5000g / m 3 The anaerobic bacteria are added into the anaerobic reaction tank 23, and the anaerobic bacteria are used in the anaerobic reaction tank 23 to perform anaerobic nitrogen removal reaction on the coking wastewater;

[0140] The dissolved oxygen of the coking wastewater in the anaerobic reaction tank 23 is controlled at 0.02 mg / L, the water temperature is controlled at 30°C, and the pH value is controlled at 6.5;

[0141] In step S4, the 2 The sulfur bacteria are attached to the attachment support sheet 331 and the coking wastewater is desulfurized by using the sulfide bacteria;

[0142] The dissolved oxygen of the coking wastewater in the desulfurization accommodation space 300 is controlled to 3 mg / L, the water temperature is controlled to 27° C., and the pH value is controlled to 6.6.

[0143] Example 4:

[0144] The difference from Example 2 is that in step S2, the 2 The aerobic bacteria are attached to the microorganism attachment plate 224, and the aerobic bacteria are used to perform aerobic nitrogen removal reaction on the coking wastewater in the aerobic reaction tank 22;

[0145] The dissolved oxygen of the coking wastewater in the aerobic reaction tank 22 is controlled at 1.5 mg / L, the water temperature is controlled at 28°C, and the pH value is controlled at 7.1;

[0146] In step S3, according to 6500g / m 3The anaerobic bacteria are added into the anaerobic reaction tank 23, and the anaerobic bacteria are used in the anaerobic reaction tank 23 to perform anaerobic nitrogen removal reaction on the coking wastewater;

[0147] The dissolved oxygen of the coking wastewater in the anaerobic reaction tank 23 is controlled at 0.06 mg / L, the water temperature is controlled at 33°C, and the pH value is controlled at 6.8;

[0148] In step S4, the 2 The sulfur bacteria are attached to the attachment support sheet 331 and the coking wastewater is desulfurized by using the sulfide bacteria;

[0149] The dissolved oxygen of the coking wastewater in the desulfurization accommodation space 300 is controlled to 4 mg / L, the water temperature is controlled to 30° C., and the pH value is controlled to 6.7.

Claims

1. A BDS total nitrogen removal equipment for coking wastewater with stable effluent, characterized in that: It comprises a wastewater holding tank (10), a denitrification reaction tower (20) and a biological desulfurization float (30) arranged in the wastewater holding tank (10); The wastewater holding tank (10) is a cement tank with an upward opening; The denitrification reaction tower (20) comprises a reaction tower support shell (21) fixed to the bottom of the wastewater holding tank (10), and the reaction tower support shell (21) is a vertically extending cylindrical shell structure; An aerobic reaction tank (22) and an anaerobic reaction tank (23) are fixedly provided in the reaction tower support shell (21), and the aerobic reaction tank (22) is connected to the anaerobic reaction tank (23) via a pipeline; An attachment support plate (221) is fixedly provided in the aerobic reaction tank (22), the attachment support plate (221) has a spirally extending flow slot (222), a spiral support plate (223) is fixedly provided on each of the upper and lower sides of the attachment support plate (221), and a plurality of microorganism attachment plates (224) are fixedly provided on the side of the spiral support plate (223); A plurality of vertically extending permeable membrane filter support tubes (231) are fixedly provided in the anaerobic reaction tank (23); the side walls of the permeable membrane filter support tubes (231) are porous hollow structures communicating with the inside and outside; and a layer of microfiltration semi-permeable membrane (232) is fixedly provided on the outer side walls of the permeable membrane filter support tubes (231); A microorganism reattachment mechanism (41) is provided in the aerobic reaction tank (22), and the microorganism reattachment mechanism (41) comprises a reattachment mechanism support plate (411) fixedly connected to the inner wall of the aerobic reaction tank (22), a radial support slide rail (412) is fixedly provided on the reattachment mechanism support plate (411), a radial support slider (413) is slidably provided on the radial support slide rail (412), a vertically extending axial support column (414) is fixedly provided on the radial support slider (413), and an attachment output pipe (415) is fixedly provided at the other end of the axial support column (414); The side wall of the attached output tube (415) is provided with a plurality of through holes communicating with each other inside and outside; The radial support slider (413) is driven by a servo motor to move along the radial support slide rail (412); An annular circumferential support slide rail (416) is fixedly connected to the inner side wall of the aerobic reaction tank (22), a circumferential support ring (417) is rotatably connected to the circumferential support slide rail (416), and the reattachment mechanism support plate (411) is fixedly connected to the inner side of the circumferential support ring (417); The circumferential support ring (417) is driven by a servo motor to rotate around the axis of the circumferential support slide rail (416); The biodesulfurization float (30) comprises a float outer shell (31) and a float inner shell (32) fixed inside the float outer shell (31); The outer spherical shell (31) of the float ball is concentrically arranged with the inner spherical shell (32), and a desulfurization accommodation space (300) is formed between the outer side wall of the inner spherical shell (32) of the float ball and the inner side wall of the outer spherical shell (31); A plurality of return support tubes (330) extending radially are fixedly provided on the outer side wall of the inner sphere shell (32) of the float; a spiral attachment support plate (33) extending spirally along the axis thereof is fixedly provided on the outer side of the return support tube (330); and a plurality of attachment support plates (331) are fixedly provided on the side wall of the spiral attachment support plate (33); The anaerobic reaction tank (23) is connected to the desulfurization accommodation space (300) through a pipeline.

2. The BDS total nitrogen removal equipment for coking wastewater with stable effluent according to claim 1, characterized in that: An aerobic tank input pipe (220) connected to the interior of the aerobic reaction tank (22) is fixedly provided on the top of the aerobic reaction tank (22), and an aerobic tank output pipe (229) connected to the interior of the aerobic reaction tank (22) is fixedly provided on the bottom of the aerobic reaction tank (22). An anaerobic tank input pipe (230) connected to the interior of the anaerobic reaction tank (23) is fixedly provided on the top of the anaerobic reaction tank (23), and an anaerobic tank output pipe (239) connected to the interior of the anaerobic reaction tank (23). The aerobic tank output pipe (229) is connected to the anaerobic tank input pipe (230) through a pipeline. The anaerobic tank input pipe (230) is connected to a vacuum deoxidation mechanism (24), the vacuum deoxidation mechanism (24) comprising a vertically placed deoxidation containing pipe (241), both ends of the deoxidation containing pipe (241) being sealed, and a deoxidation driving piston (242) being slidably fitted in the deoxidation containing pipe (241); A deoxidation input pipe (243) and a deoxidation output pipe (244) communicating with the interior of the deoxidation containing pipe (241) are fixedly provided on the outer wall thereof near the bottom. The deoxidation input pipe (243) is provided with a first valve (245), and the deoxidation output pipe (244) is provided with a second valve (246). A piston driving connecting rod (247) is fixedly connected to the deoxidation driving piston (242); A piston-driven accommodating tube (248) is fixedly provided on the top of the deoxidation accommodating tube (241), and a piston-driven telescopic rod (249) is fixedly provided inside the piston-driven accommodating tube (248). The piston-driven telescopic rod (249) is an electrically controlled telescopic rod, and the outer rod end of the piston-driven telescopic rod (249) is fixedly connected to the inner side wall of the piston-driven accommodating tube (248). The other end of the piston-driven connecting rod (247) extends into the piston-driven accommodating tube (248) and is fixedly connected to the inner rod of the piston-driven telescopic rod (249).

3. The BDS total nitrogen removal equipment for coking wastewater with stable effluent according to claim 1, characterized in that: A circulation mechanism (42) is provided at the bottom of the aerobic reaction tank (22). The circulation mechanism (42) includes a circulation housing (421). The circulation housing (421) is a trumpet-shaped shell structure. The larger end of the opening of the circulation housing (421) is fixedly connected to the bottom of the aerobic reaction tank (22). A circulation shaft accommodating shell (422) is fixedly provided in the circulation circulation housing (421). A circulation drive shaft (423) is fixedly connected to the top of the circulation shaft accommodating shell (422). Circulation drive blades (424) are fixedly provided on the circulation drive shaft (423). A motor for driving the circulation drive shaft (423) to rotate is provided in the circulation shaft accommodating shell (422). A plurality of circulation input communication holes (420) communicating with each other are provided on the side wall of the circulation circulation housing (421).

4. The BDS total nitrogen removal equipment for coking wastewater with stable effluent according to claim 1, characterized in that: The anaerobic reaction tank (23) is provided with a membrane-penetrating flushing mechanism (25), the membrane-penetrating flushing mechanism (25) comprising a plurality of flushing lifting support rails (251) fixed on the inner side wall of the anaerobic reaction tank (23), a flushing lifting support slider (252) being slidably connected on the flushing lifting support rails (251), a flushing support plate (253) being fixedly connected to the plurality of flushing lifting support sliders (252), the flushing support plate (253) having a plurality of through-and-through fitting holes (254), the membrane-penetrating filter element support tubes (231) being located in the through-and-through fitting holes (254) in a one-to-one correspondence; The flushing support plate (253) is a hollow structure with two sides penetrating through it; A flushing support ring (255) is fixedly provided at the penetration fitting hole (254), and a plurality of flushing nozzles (256) are fixedly provided on the inner side of the flushing support ring (255).

5. The BDS total nitrogen removal equipment for coking wastewater with stable effluent according to claim 1, characterized in that: The side wall of the spiral attachment support plate (33) is provided with a microorganism arrangement mechanism (34), and the microorganism arrangement mechanism (34) includes a biological arrangement support slide rail (341) fixed on the side wall of the spiral attachment support plate (33), a biological arrangement support slider (342) is slidably matched on the biological arrangement support slide rail (341), a vertically extending biological arrangement support column (343) is fixedly connected to the biological arrangement support slider (342), and a plurality of biological arrangement tubes (344) extending radially thereof are fixedly provided on the biological arrangement support column (343), and the side wall of the biological arrangement tube (344) has a plurality of through holes communicating with each other inside and outside; Every two biological arrangement tubes (344) form a group, and during operation, the attachment support sheets (331) are located in each group of biological arrangement tubes (344) in a one-to-one correspondence.

6. The BDS total nitrogen removal equipment for coking wastewater with stable effluent according to claim 1, characterized in that: A plurality of circulation drainage shells (35) are fixedly provided on the inner side wall of the outer spherical shell (31) of the float. The circulation drainage shells (35) are disc-shaped shell structures. The outer side of the circulation drainage shell (35) has a plurality of circulation drainage holes (351) that communicate with each other. The return flow support pipe (330) is connected to the interior of the circulation drainage shell (35) through a circulation connecting pipe (352). The side wall of the reflux support tube (330) is provided with a plurality of through holes communicating with each other inside and outside; A circulation drive water pump (353) is fixedly provided in the circulation connecting pipe (352), the input end of the circulation drive water pump (353) is connected to a side close to the return flow support pipe (330), and the output end of the circulation drive water pump (353) is connected to a side close to the circulation drainage shell (35).

7. A method for removing total nitrogen from coking wastewater (BDS) with stable effluent, based on the BDS denitrification equipment for removing total nitrogen from coking wastewater with stable effluent according to any one of claims 1 to 6, characterized in that The following steps are involved: S1. First, the coking wastewater is subjected to static sedimentation and filtration treatment to remove solid precipitation and suspended matter in the coking wastewater; S2, transporting the filtered coking wastewater to a wastewater holding tank (10), wherein the wastewater holding tank (10) is provided with a water delivery pump, and the water delivery pump delivers the coking wastewater to an aerobic reaction tank (22) through a pipeline; According to 0.2~0.6g / cm 2 The aerobic bacteria are attached to the microbial attachment plate (224) and the aerobic bacteria are used to perform an aerobic nitrogen removal reaction on the coking wastewater in the aerobic reaction tank (22); The dissolved oxygen of the coking wastewater in the aerobic reaction tank (22) is controlled to 0.3~2 mg / L, the water temperature is controlled to 25~31°C, and the pH value is controlled to 6.8~7.3; S3, the coking wastewater after aerobic denitrification reaction is transported to the anaerobic reaction tank (23), and the nitrogen content is 5000~8000g / m 3 The anaerobic bacteria are added into the anaerobic reaction tank (23) in an amount of , and the anaerobic bacteria are used in the anaerobic reaction tank (23) to perform an anaerobic nitrogen removal reaction on the coking wastewater; The dissolved oxygen of the coking wastewater in the anaerobic reaction tank (23) is controlled to be 0.02~0.1mg / L, the water temperature is controlled to be 30~36℃, and the pH value is controlled to be 6.5~7.1; The coking wastewater after anaerobic nitrogen removal is filtered using a microfiltration semipermeable membrane (232), and the filtered coking wastewater enters the permeable membrane filter element support tube (231) and is discharged through a pipeline; S4, transport the coking wastewater after anaerobic nitrogen removal to the desulfurization holding space (300), according to 0.3~0.8g / cm 2 The sulfur bacteria are attached to the attachment support sheet (331) and the coking wastewater is desulfurized by using the sulfiding bacteria; The dissolved oxygen of the coking wastewater in the desulfurization accommodation space (300) is controlled to be 3~5 mg / L, the water temperature is controlled to be 27~33°C, and the pH value is controlled to be 6.6~6.9.

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