A total nitrogen removal device for BDS multistage treatment of coking wastewater and a method thereof

Abstract

The application discloses a total nitrogen removal method and device for BDS multistage treatment of coking wastewater, and comprises the following steps: S1, primary treatment: filtering wastewater through a filter plate; S2, secondary treatment: S2-1, anaerobic reaction: filtering wastewater flows into an anaerobic bin to perform anaerobic reaction; S2-2, anoxic reaction: wastewater after the anaerobic reaction is introduced into an anoxic bin to perform anoxic reaction, during which, a cleaning mechanism cleans solid particles in the filter bin; S3-3, aerobic reaction: wastewater after the anoxic reaction is introduced into an aerobic bin to perform aerobic reaction; S3, tertiary treatment: wastewater after the aerobic reaction is introduced into a sedimentation bin to perform sedimentation. The application removes solid particles in wastewater through a filter bin for primary treatment, and then makes wastewater perform anaerobic-anoxic-aerobic reaction, so that microorganism groups in activated sludge absorb pollutants to remove pollutants in wastewater.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a total nitrogen removal device for coking wastewater BDS multi-stage treatment and a method thereof. BACKGROUND

[0002] Coking wastewater is a high-concentration organic wastewater mainly containing phenol generated in the process of coal into coke, coal gas purification and coking product recovery, which has complex components. The coking wastewater mainly contains ammonia nitrogen, cyanide, phenolic compounds, polycyclic aromatic compounds and heterocyclic compounds containing nitrogen, oxygen and sulfur, and aliphatic compounds and other pollutants.

[0003] Due to the large amount of nitrogen-containing compounds contained in the coking wastewater, these nitrogen-containing compounds can cause eutrophication of water bodies, causing a large number of algae to reproduce and destroying the water ecological balance. At the same time, these nitrogen-containing compounds can be decomposed into harmful substances such as nitrite after entering the human body, causing great harm to human health. Therefore, there is an urgent need for a total nitrogen removal method and device for coking wastewater BDS multi-stage treatment. SUMMARY

[0004] To solve the above technical problems, the present application provides a total nitrogen removal method and device for coking wastewater BDS multi-stage treatment.

[0005] The technical scheme of the present application is: a total nitrogen removal method for coking wastewater BDS multi-stage treatment, comprising the following steps:

[0006] S1, primary treatment: the wastewater is introduced into the filter bin through the water inlet pipe, and the wastewater is filtered through the filter plate to obtain filtered wastewater;

[0007] S2, secondary treatment:

[0008] S2-1, anaerobic reaction: the filtered wastewater flows into the anaerobic bin, and activated sludge, carbon source and nitrogen source are added into the anaerobic bin, and the filtered wastewater is stirred by the first stirring mechanism to make the filtered wastewater perform anaerobic reaction to obtain wastewater after anaerobic reaction;

[0009] S2-2, anoxic reaction: the wastewater after anaerobic reaction is introduced into the anoxic bin, and the wastewater after anaerobic reaction is stirred by the second stirring mechanism to perform anoxic reaction to obtain wastewater after anoxic reaction; during the period, the cleaning mechanism can clean the solid particles in the filter bin;

[0010] S3-3, aerobic reaction: the wastewater after anoxic reaction is introduced into the aerobic bin, and the wastewater after anoxic reaction is treated by aeration by the aeration mechanism to make the wastewater after anoxic reaction perform aerobic reaction to obtain wastewater after aerobic reaction;

[0011] S3, tertiary processing: the wastewater after aerobic reaction is introduced into the sedimentation bin, so that the wastewater after aerobic reaction is sedimented, and the wastewater after multi-stage processing is obtained after the sedimentation is completed, and the wastewater after multi-stage processing is discharged through the drain pipe.

[0012] Description: the above method performs primary processing on the wastewater through the filter bin to remove solid particles in the wastewater, then makes the wastewater perform anaerobic, anoxic and aerobic reactions, so that the microbial flora in the activated sludge absorbs the pollutants, and the ammonia nitrogen and other pollutants are converted into nitrogen and nitrate, so that the pollutants in the wastewater are removed.

[0013] On the other hand, the application provides a device for total nitrogen removal method for coking wastewater BDS multi-stage processing, which comprises a shell, a cleaning mechanism, a first stirring mechanism and a second stirring mechanism, the shell is divided into a first half area and a second half area by a vertical partition plate arranged therein;

[0014] The first half area is divided into an anaerobic bin, an aerobic bin and a gas supply bin arranged in sequence from top to bottom by two first transverse partition plates arranged therein, and the second half area is divided into a filter bin, an anoxic bin and a sedimentation bin arranged in sequence from top to bottom by two second transverse partition plates arranged therein; the two second transverse partition plates are respectively located in the middle of the anaerobic bin and the aerobic bin, and the filter bin, the anaerobic bin, the anoxic bin, the aerobic bin and the sedimentation bin are sequentially connected by pipelines provided with valves;

[0015] A filter plate is vertically arranged in the filter bin, the second transverse partition plate in the filter bin is composed of a fixed plate located on one side of the filter plate and a lifting plate located on the other side of the filter plate, the fixed plate is fixedly connected with the vertical partition plate, the lifting plate is vertically and sealingly connected with the inner wall of the filter bin by sliding, and a floating box is arranged in the anoxic bin and fixedly connected with the lifting plate by a spring rod;

[0016] A cleaning mechanism for cleaning the lifting plate by lifting the lifting plate is arranged above the filter bin, and a water inlet pipe is arranged on the sidewall of the filter bin on the other side of the filter plate; a first stirring mechanism is arranged in the anaerobic bin, a second stirring mechanism is arranged in the anoxic bin, and an aeration mechanism for aerating the aerobic bin is arranged in the gas supply bin; a drain pipe is arranged on the sidewall of the sedimentation bin, and a sludge discharge pipe is arranged on the bottom surface of the sedimentation bin;

[0017] A reflux pump is arranged on the outer wall of the aerobic bin, the input end of the reflux pump is connected with the aerobic bin through a pipeline, and the output end of the reflux pump is connected with the anoxic bin through a pipeline.

[0018] The device filters the wastewater in the filtering bin through the filter plate, and the solid particles in the wastewater are left on the lifting plate. The wastewater then enters the anaerobic bin, the anoxic bin and the aerobic bin in turn for reaction. When the wastewater enters the anoxic bin, the float tank will push the lifting plate upward under the action of buoyancy until the lifting plate moves to the highest point. At this time, the cleaning mechanism is started to clean the solid particles on the lifting plate, so as to avoid the blockage of the filter plate caused by the accumulation of solid particles.

[0019] Further, the first stirring mechanism comprises a first stirring shaft vertically arranged in the anaerobic bin, a motor plate transversely arranged in the anaerobic bin, and a first motor arranged on the motor plate.

[0020] The lower end of the first stirring shaft extends into the aerobic bin, and the first stirring shaft is in rotational sealing connection with the first transverse partition plate. The upper end of the first stirring shaft penetrates through the motor plate and is fixedly connected with the output shaft of the first motor.

[0021] The first motor can drive the first stirring shaft to rotate, so that the first stirring shaft can stir the anaerobic bin and the aerobic bin together.

[0022] Further, the second stirring mechanism comprises a second stirring shaft transversely arranged in the anoxic bin and parallel to the vertical partition plate, and a second motor fixedly arranged on the outer wall of the shell.

[0023] Both ends of the second stirring shaft are in rotational sealing connection with the anoxic bin, and one end of the second stirring shaft penetrates through the side wall of the anoxic bin and is connected with the output shaft of the second motor.

[0024] The second motor can drive the second stirring shaft to rotate, so that the second stirring shaft can stir the anoxic bin.

[0025] Further, the aeration mechanism is a gas pump arranged in the gas supply bin. The lower end of the first stirring shaft is fixedly connected with a gas distribution disc. A gas passage is vertically arranged at the center of the gas distribution disc. A plurality of gas distribution openings are arranged on the gas distribution disc and are in communication with the gas passage. The gas pump is in rotational connection and communication with the gas passage through a gas distribution pipeline.

[0026] The first stirring shaft can drive the gas distribution disc to rotate, so that the gas distribution disc can distribute gas into the aerobic bin during rotation, so that oxygen is uniformly distributed in the aerobic bin.

[0027] Further, the bottom surface of the sedimentation bin is provided with a sludge conveying pump. The input end of the sludge conveying pump is in communication with the side wall of the sludge discharge pipe through a pipeline. The output end of the sludge conveying pump is in communication with the anaerobic bin through a sludge conveying pipeline.

[0028] The sludge conveying pump can return part of the activated sludge to the anaerobic bin to supplement the microbial flora in the anaerobic bin, improve the wastewater treatment effect, and reduce the consumption of activated sludge.

[0029] Furthermore, the cleaning mechanism includes a frame arranged above the filter bin, a screw arranged transversely in the frame and parallel to the second stirring shaft, and a cleaning plate slidably arranged in the frame and threadedly connected to the screw;

[0030] The screw is rotatably connected to the frame, one end of the screw passes through the side wall of the frame and is sleeved with a first pulley, one end of the second stirring shaft is sleeved with a second pulley for transmitting power to the first pulley through a transmission belt, and one end of the frame extends to the outside of the shell.

[0031] Description: When the above cleaning mechanism undergoes anoxic reaction in the wastewater, the second stirring shaft can drive the screw to rotate through the first pulley and the second pulley, so that the cleaning plate can move along the axial direction of the screw to clean the lifting plate, so that the anoxic reaction and the lifting plate cleaning are carried out simultaneously, making the device easier to use.

[0032] Furthermore, both ends of the cleaning plate extend to the outside of the frame, and a top rod is vertically provided at one end of the cleaning plate.

[0033] A purge plate is vertically provided on one side of the filter plate, and both ends of the purge plate are slidably connected to the vertical slide groove provided on the inner wall of the filter bin, and the bottom surface of the vertical slide groove is connected to the purge plate through a spring;

[0034] The two ends of the upper part of the purge plate are respectively provided with a trough, and the purge plate between the two troughs has a crest for cooperating with the push rod to push the purge plate to slide up and down;

[0035] The purge plate is provided with several air ports for purging the filter plate, and the several air ports are connected to the air supply pipe arranged horizontally in the purge plate. The bottom of the purge plate is provided with multiple air bags, and the multiple air bags are connected to the air supply pipe, and the air bags are in contact with the fixed plate.

[0036] Description: When the cleaning plate moves along the axial direction of the screw, the push rod can move with the cleaning plate. During the movement of the push rod, it will contact the purge plate and cooperate with the peaks and troughs to make the purge plate slide up and down. When the purge plate slides downward, it will squeeze the air bag and release the gas in the air bag through the blowing port. The purge plate will purge the filter plate during the downward movement to prevent the filter holes on the filter plate from being blocked.

[0037] Furthermore, the purge plate is provided with a guide groove for cooperating with the ejector rod, and the ejector rod is provided with a vertical lubricating oil channel for applying lubricating oil into the guide groove;

[0038] The cleaning plate is provided with a liquid storage tank, and a third transverse partition is provided in the liquid storage tank to separate it into a lubricating oil storage area and a medicine storage area arranged in sequence from top to bottom;

[0039] The fixed sleeve is vertically arranged in the lubricating oil storage area, and an oil outlet is arranged on the side wall of the fixed sleeve; and the bottom surface of the medicament storage area is provided with a liquid outlet pipe;

[0040] The upper end of the jacking rod penetrates the liquid outlet pipe and the third transverse partition plate in sequence and is in sliding sealing connection with the fixed sleeve; a transverse lubricating oil passage for rotating and connecting with the oil outlet is arranged on the side wall of the jacking rod; and the transverse lubricating oil passage is in communication with the vertical lubricating oil passage;

[0041] A gap for the medicament to pass through is arranged between the liquid outlet pipe and the jacking rod; a sealing ring for controlling the opening and closing of the liquid outlet pipe by sliding up and down is arranged on the side wall of the jacking rod; and the sealing ring and the third transverse partition plate are connected by a spring;

[0042] A rotating sleeve is rotatably arranged on the jacking rod; the upper end of the rotating sleeve penetrates the cleaning plate and is in rotating sealing connection with the bottom surface of the liquid storage tank; the rotating sleeve is in communication with the liquid outlet pipe; a gear and a liquid supply bin are arranged on the rotating sleeve in sequence from top to bottom; and a gap for the medicament to pass through is arranged between the inner wall of the rotating sleeve and the jacking rod;

[0043] A rack for engaging with the gear is arranged on the outer wall of the frame; and a clamping mechanism for clamping with the jacking rod is arranged on the side wall of the rotating sleeve;

[0044] The liquid supply bin is in rotating sealing connection with the rotating sleeve; the liquid supply bin is in communication with the inside of the rotating sleeve; one side of the liquid supply bin is in sliding connection with the outer wall of the frame; and the other side of the liquid supply bin is provided with a medicament application pipe in communication therewith.

[0045] When the cleaning plate is blowing, the rotating sleeve and the jacking rod can be clamped by the clamping mechanism; then during the movement of the jacking rod following the cleaning plate, the jacking rod will rotate; during the rotation of the jacking rod, the transverse lubricating oil passage will be in rotating connection with the oil outlet, so that the lubricating oil in the liquid storage tank is applied in the guide groove, thereby reducing the frictional resistance and the wear of the jacking rod; when the wastewater is subjected to primary treatment, the clamping mechanism can be loosened; during the movement of the jacking rod following the cleaning plate, the jacking rod will contact the blowing plate and be lifted up and down, so that the medicament in the liquid storage tank can be released during the movement of the cleaning plate, thereby improving the application range of the medicament and making the wastewater and the medicament more uniformly mixed.

[0046] Further, the clamping mechanism comprises a plurality of clamping columns in threaded connection with the side wall of the rotating sleeve; and a clamping groove for cooperating with the clamping column is arranged on the side wall of the jacking rod.

[0047] The clamping mechanism is firmly clamped by the clamping column and the clamping groove, and is simple to operate and low in manufacturing cost, thereby being good in economy.

[0048] The beneficial effects of the present application are:

[0049] (1) The method of the present application carries out primary treatment on wastewater through the filter bin to remove solid particles in the wastewater, and then makes the wastewater undergo anaerobic-anoxic-aerobic reaction, so that the microbial flora in the activated sludge absorbs the pollutants, and the ammonia nitrogen and other pollutants are converted into nitrogen and nitrate, so that the pollutants in the wastewater are removed.

[0050] (2) The filter plate of the device can filter the wastewater, so that the solid particles in the wastewater are left on the lifting plate, and then the wastewater sequentially enters the anaerobic bin, the anoxic bin and the aerobic bin for reaction. When the wastewater enters the anoxic bin, the floating box pushes the lifting plate upward under the action of buoyancy until the lifting plate moves to the highest point, and then the cleaning mechanism can be started to clean the solid particles on the lifting plate, so as to avoid blockage of the filter plate caused by accumulation of solid particles.

[0051] (3) The cleaning mechanism of the device can drive the lifting plate to move axially for cleaning when the wastewater undergoes anoxic reaction, so that the anoxic reaction and the cleaning of the lifting plate are carried out at the same time, making the device more convenient to use.

[0052] (4) When the blowing plate blows, the lubricating oil in the liquid storage tank can be released into the guide groove through the ejector rod to reduce frictional resistance and reduce wear of the ejector rod. When the wastewater is subjected to primary treatment, the reagent in the liquid storage tank can be released during the movement of the cleaning plate, thereby improving the application range of the reagent and making the wastewater and the reagent mix more uniformly. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is a schematic diagram of the overall structure of embodiment 1 of the present application;

[0054] Figure 2 is a schematic diagram of the internal structure of the shell of embodiment 1 of the present application;

[0055] Figure 3 is a schematic diagram of the structure of the reflux pump of embodiment 1 of the present application;

[0056] Figure 4 is a schematic diagram of the cleaning structure of embodiment 1 of the present application;

[0057] Figure 5 is a schematic diagram of the air distribution disc structure of embodiment 1 of the present application;

[0058] Figure 6 is a schematic diagram of the internal structure of the shell of embodiment 2 of the present application;

[0059] Figure 7 is an enlarged view of A of Figure 6

[0060] Figure 8 is a schematic diagram of the blowing plate structure of embodiment 2 of the present application;​

[0061] Figure 9 is a schematic diagram of the cleaning structure of embodiment 3 of the present application;

[0062] Figure 10 is a schematic diagram of the ejector structure of embodiment 3 of the present application;

[0063] Figure 11 is a sectional view of the liquid storage tank of embodiment 3 of the present application;

[0064] Figure 12 is a sectional view of the ejector of embodiment 3 of the present application;

[0065] 1 - shell, 11 - vertical partition, 2 - first half area, 21 - first horizontal partition, 22 - anaerobic bin, 221 - first stirring shaft, 222 - motor plate, 223 - first motor, 23 - aerobic bin, 231 - reflux pump, 232 - air distribution disc, 24 - gas supply bin, 241 - gas pump, 242 - air distribution pipeline, 3 - second half area, 31 - second horizontal partition, 311 - fixed plate, 312 - lifting plate, 32 - filter bin, 321 - filter plate, 322 - water inlet pipe, 33 - anoxic bin, 331 - buoyancy tank, 332 - spring rod, 333 - second stirring shaft, 334 - second motor, 335 - second pulley, 34 - sedimentation bin, 341 - drainage pipe, 342 - sludge discharge pipe, 343 - sludge conveying pump, 344 - sludge conveying pipeline, 4 - cleaning mechanism, 41 - frame, 42 - lead screw, 43 - cleaning plate, 44 - first pulley, 45 - ejector, 46 - blowing plate, 461 - trough, 462 - peak, 463 - air bag, 47 - rotating sleeve, 471 - gear, 472 - liquid supply bin, 473 - medicine supply pipe, 48 - rack, 49 - liquid storage tank, 491 - third horizontal partition, 492 - oil outlet, 493 - liquid outlet pipe, 494 - fixed sleeve. DETAILED DESCRIPTION

[0066] The application will be described in further detail below with specific embodiments, so as to better reflect the advantages of the application.

[0067] Embodiment 1

[0068] A total nitrogen removal method for BDS multistage treatment of coking wastewater, comprising the following steps:

[0069] S1, primary treatment: the wastewater is introduced into the filter bin 32 through the water inlet pipe, and the wastewater is filtered through the filter plate 321 to obtain filtered wastewater;

[0070] S2, secondary treatment:

[0071] S2-1, anaerobic reaction: the filtered wastewater flows into the anaerobic bin 22, and activated sludge, carbon source and nitrogen source are added into the anaerobic bin 22, the filtered wastewater is stirred by the first stirring mechanism, so that the filtered wastewater is subjected to anaerobic reaction, and wastewater after anaerobic reaction is obtained;

[0072] S2-2, anoxic reaction: the wastewater after anaerobic reaction is introduced into the anoxic bin 33, and the wastewater after anaerobic reaction is stirred by the second stirring mechanism, so that the anoxic reaction is carried out, and wastewater after anoxic reaction is obtained; during the period, the cleaning mechanism 4 can clean the solid particles in the filter bin 32;

[0073] S3-3, aerobic reaction: the wastewater after anoxic reaction is introduced into the aerobic bin 23, and the wastewater after anoxic reaction is subjected to aerobic reaction by the aeration mechanism, so that the wastewater after aerobic reaction is obtained;

[0074] S3, tertiary treatment: the wastewater after aerobic reaction is introduced into the sedimentation bin 34, so that the wastewater after aerobic reaction is subjected to sedimentation, and after the sedimentation is completed, the wastewater after multi-stage treatment is obtained, and the wastewater after multi-stage treatment is discharged through the drain pipe 341;

[0075] The device used in the total nitrogen removal method for the multi-stage treatment of the coking wastewater BDS is shown in Figure 1 The device includes a shell 1, a cleaning mechanism, a first stirring mechanism and a second stirring mechanism, the shell 1 is divided into a first half area 2 and a second half area 3 by a vertical partition plate 11 arranged therein;

[0076] As shown in Figure 2 The first half area 2 is divided into an anaerobic bin 22, an aerobic bin 23 and a gas supply bin 24 arranged in sequence from top to bottom by two first transverse partition plates 21 arranged therein, and the second half area 3 is divided into a filter bin 32, an anoxic bin 33 and a sedimentation bin 34 arranged in sequence from top to bottom by two second transverse partition plates 31 arranged therein; the two second transverse partition plates 31 are respectively located in the middle of the anaerobic bin 22 and the aerobic bin 23, and the filter bin 32, the anaerobic bin 22, the anoxic bin 33, the aerobic bin 23 and the sedimentation bin 34 are sequentially connected by pipelines provided with valves;

[0077] A filter plate 321 is vertically arranged in the filter bin 32, the second transverse partition plate 31 in the filter bin 32 is composed of a fixed plate 311 located on the left side of the filter plate 321 and a lifting plate 312 located on the right side of the filter plate 321, the fixed plate 311 is fixedly connected with the vertical partition plate 11, the lifting plate 312 is vertically slidably connected with a sliding groove arranged on the inner wall of the filter bin 32, the anoxic bin 33 is provided with a float box 331, the float box 331 is fixedly connected with the lifting plate 312 by a spring rod 332, and the spring rod 332 is a product of the prior art;

[0078] The cleaning mechanism 4 for cleaning the lifting plate 312 is arranged above the filter bin 32, and a water inlet pipe 322 is arranged on the sidewall of the filter bin 32 on the right side of the filter plate 321; the first stirring mechanism is arranged in the anaerobic bin 22, the second stirring mechanism is arranged in the anoxic bin 33, and the aeration mechanism for aerating the aerobic bin 23 is arranged in the gas supply bin 24; the sidewall of the sediment bin 34 is provided with a drain pipe 341, and the bottom surface of the sediment bin 34 is provided with a sludge discharge pipe 342;

[0079] As shown in Figure 3 , the outer wall of the aerobic bin 23 is provided with a reflux pump 231, the reflux pump 231 is a product of the prior art, the input end of the reflux pump 231 is communicated with the aerobic bin 23 through a pipeline, and the output end of the reflux pump 231 is communicated with the anoxic bin 33 through a pipeline;

[0080] The first stirring mechanism comprises a first stirring shaft 221 vertically arranged in the anaerobic bin 22, a motor plate 222 transversely arranged in the anaerobic bin 22, and a first motor 223 arranged on the motor plate 222, the first motor 223 is a product of the prior art;

[0081] The lower end of the first stirring shaft 221 extends into the aerobic bin 23, and the first stirring shaft 221 is in rotational sealing connection with the first transverse partition plate 21, and the upper end of the first stirring shaft 221 penetrates through the motor plate 222 and is fixedly connected with the output shaft of the first motor 223;

[0082] The second stirring mechanism comprises a second stirring shaft 333 transversely arranged in the anoxic bin 33 and parallel to the vertical partition plate 11, and a second motor 334 fixedly arranged on the outer wall of the shell 1, the second motor 334 is a product of the prior art;

[0083] The front and rear ends of the second stirring shaft 333 are both in rotational sealing connection with the anoxic bin 33, and the front end of the second stirring shaft 333 penetrates through the sidewall of the anoxic bin 33 and is connected with the output shaft of the second motor 334;

[0084] The aeration mechanism is a gas pump 241 arranged in the gas supply bin 24, the gas pump 241 is a product of the prior art, and the lower end of the first stirring shaft 221 is fixedly connected with a gas distribution disc 232, as shown in Figure 5 , a gas passage is vertically arranged at the center of the gas distribution disc 232, and twelve gas distribution openings are arranged on the gas distribution disc 232 and communicated with the gas passage, and the gas pump 241 is in rotational connection and communication with the gas passage through a gas distribution pipeline 242;

[0085] The bottom surface of the sediment bin 34 is provided with a sludge conveying pump 343, the input end of the sludge conveying pump 343 is communicated with the sidewall of the sludge discharge pipe 342 through a pipeline, and the output end of the sludge conveying pump 343 is communicated with the anaerobic bin 22 through a sludge conveying pipeline 344;

[0086] As Figure 4 shown, the cleaning mechanism 4 includes a frame 41 arranged above the filter bin 32, a lead screw 42 arranged transversely in the frame 41 and parallel to the second stirring shaft 333, and a cleaning plate 43 slidingly arranged in the frame 41 and threadedly connected with the lead screw 42;

[0087] The lead screw 42 is rotationally connected with the frame 41, the front end of the lead screw 42 penetrates through the side wall of the frame 41 and is sleeved with a first pulley 44, the front end of the second stirring shaft 333 is sleeved with a second pulley 335 for driving the first pulley 44 through a transmission belt, and the rear end of the frame 41 extends to the outside of the shell 1.

[0088] The working principle of the above cleaning mechanism is as follows: after the wastewater after anaerobic reaction is introduced into the anoxic bin 33, the float box 331 will drive the lifting plate 312 to rise due to the action of buoyancy until the lifting plate 312 rises to contact the cleaning mechanism 4, and the second stirring mechanism will be started to stir the wastewater in the anoxic bin 33 in the forward and reverse directions, at the same time, the second stirring shaft 333 will drive the lead screw 42 to rotate through the second pulley 335 and the first pulley 44, and the cleaning plate 43 will move axially along the lead screw 42, and the solid particles on the lifting plate 312 will be pushed to the rear end of the frame 41 during the movement of the cleaning plate 43 until the solid particles fall off from the lifting plate 312.

[0089] Embodiment 2

[0090] As Figure 6 shown, the cleaning plate 43 of the present embodiment is basically the same as that of embodiment 1, except that the left and right ends of the cleaning plate 43 both extend to the outside of the frame 41, and a top rod 45 is vertically arranged at the left end of the cleaning plate 43,

[0091] As Figure 7 shown, a blowing plate 46 is vertically arranged at the left side of the filter plate 321, the front and rear ends of the blowing plate 46 are both slidingly connected with a vertical sliding slot arranged on the inner wall of the filter bin 32, and the bottom surface of the vertical sliding slot is connected with the blowing plate 46 through a spring;

[0092] As Figure 8 shown, the left and right ends of the upper part of the blowing plate 46 are respectively provided with a trough 461, and the blowing plate 46 between the two troughs 461 is provided with a peak 462 for cooperating with the top rod 45 to push the blowing plate 46 to slide up and down;

[0093] The blowing plate 46 is provided with a plurality of air blowing ports for blowing the filter plate 321, the plurality of air blowing ports are all in communication with a gas supply pipeline arranged transversely in the blowing plate 46, the bottom of the blowing plate 46 is provided with two air bags 463, the two air bags 463 are both in communication with the gas supply pipeline, and the air bags 463 are in contact with the fixed plate 311.

[0094] The working principle of the above-mentioned purge plate 46 is: when the cleaning plate 43 moves axially along the screw 42, the push rod 45 will contact the upper part of the purge plate 46 and cooperate with the crest 462 and the trough 461 to make the purge plate 46 slide up and down. When the purge plate 46 slides downward, the fixed plate 311 will squeeze the air bag 463, so that the gas in the air bag 463 is released from the blowing port through the air supply pipe to purge the filter plate 321.

[0095] Example 3

[0096] like Figure 9 As shown, this embodiment is basically the same as embodiment 2, except that a guide groove for cooperating with the ejector rod 45 is provided on the purge plate 46, and a vertical lubricating oil channel for applying lubricating oil into the guide groove is provided inside the ejector rod 45;

[0097] like Figure 11 As shown, a liquid storage tank 49 is provided on the cleaning plate 43, and a third transverse partition 491 is provided in the liquid storage tank 49 to separate it into a lubricating oil storage area and a reagent storage area arranged in sequence from top to bottom. The reagents are a carbon source and a nitrogen source.

[0098] A fixed sleeve 494 is vertically provided in the lubricating oil storage area, and an oil outlet 492 is provided on the side wall of the fixed sleeve 494; a liquid outlet pipe 493 is provided on the bottom surface of the medicine storage area;

[0099] The upper end of the push rod 45 passes through the liquid outlet pipe 493 and the third transverse partition 491 in sequence and is slidably and sealedly connected to the fixed sleeve 494. The side wall of the push rod 45 is provided with a transverse lubricating oil channel for rotationally docking with the oil outlet. The transverse lubricating oil channel is connected to the vertical lubricating oil channel.

[0100] A gap is provided between the liquid outlet pipe 493 and the push rod 45 for passage of the medicine. A sealing ring 451 is sleeved on the side wall of the push rod 45 for controlling the opening and closing of the liquid outlet pipe 493 by sliding up and down. The sealing ring 451 is connected to the third transverse partition 491 via a spring.

[0101] like Figure 12 As shown, a rotating sleeve 47 is rotatably mounted on the push rod 45. The upper end of the rotating sleeve 47 passes through the cleaning plate 43 and is rotatably and sealedly connected to the bottom surface of the liquid storage tank 49. The rotating sleeve 47 is in communication with the liquid outlet pipe 493. A gear 471 and a liquid supply chamber 472 are sequentially mounted on the rotating sleeve 47 from top to bottom. A gap is provided between the inner wall of the rotating sleeve 47 and the push rod 45 for the passage of the medicine.

[0102] The outer wall of the frame 41 is provided with a rack 48 for engaging with the gear 471, and the side wall of the rotating sleeve 47 is provided with a clamping mechanism for clamping with the top rod 45;

[0103] likeFigure 10 As shown, the clamping mechanism includes two clamping columns threadedly connected with the side wall of the rotating sleeve 47, and the top rod 45 is provided with clamping grooves for cooperating with the clamping columns;

[0104] The liquid supply bin 472 is in rotational sealing connection with the rotating sleeve 47, and the liquid supply bin 472 is in internal communication with the rotating sleeve 47. The right side of the liquid supply bin 472 is in sliding connection with the outer wall of the frame 41, and the left side of the liquid supply bin 472 is provided with a medicine application pipe 473 in communication therewith.

[0105] The working principle of the top rod 45 is as follows: when the blowing plate 46 blows, the clamping mechanism is controlled to clamp the rotating sleeve 47 with the top rod 45, the second stirring mechanism is started, and the cleaning plate 43 moves axially along the lead screw 42. Since the rack 48 and the gear 471 are in meshing engagement, the rotating sleeve 47 drives the top rod 45 to rotate, so that the oil outlet and the horizontal lubricating oil channel are continuously connected and disconnected, so that the lubricating oil in the liquid storage tank 49 is applied to the guide groove through the vertical lubricating oil channel;

[0106] When the wastewater is subjected to primary treatment, the clamping mechanism is controlled to disengage the rotating sleeve 47 from the top rod 45, and the second stirring mechanism is started. At this time, the rotating sleeve 47 cannot drive the top rod 45 to rotate, and when the cleaning plate 43 moves axially along the lead screw 42, the top rod 45 moves up and down when it contacts the blowing plate 46, so that the sealing ring 451 opens the liquid outlet pipe 493, and the medicament in the liquid storage tank 49 flows into the liquid supply bin 472 and is released through the medicine application pipe 473.

Claims

1. A total nitrogen removal device for multi-stage treatment of coking wastewater BDS, characterized in that, The device comprises a shell (1), a cleaning mechanism, a first stirring mechanism and a second stirring mechanism, the shell (1) is divided into a first half area (2) and a second half area (3) by a vertical partition plate (11) arranged therein; two first horizontal partition plates (21) arranged therein divide the space in the first half area (2) into an anaerobic bin (22), an aerobic bin (23) and a gas supply bin (24) arranged in sequence from top to bottom, two second horizontal partition plates (31) arranged in the second half area (3) divide the space into a filter bin (32), an anoxic bin (33) and a sedimentation bin (34) arranged in sequence from top to bottom; the two second horizontal partition plates (31) are respectively located at the middle of the anaerobic bin (22) and the aerobic bin (23), and the filter bin (32), the anaerobic bin (22), the anoxic bin (33), the aerobic bin (23) and the sedimentation bin (34) are sequentially communicated through pipelines provided with valves; a filter plate (321) is vertically arranged in the filter bin (32), the second horizontal partition plate (31) in the filter bin (32) is composed of a fixed plate (311) located at one side of the filter plate (321) and a lifting plate (312) located at the other side of the filter plate (321), the fixed plate (311) is fixedly connected with the vertical partition plate (11), the lifting plate (312) is vertically and sealingly connected with the inner wall of the filter bin (32), and a float box (331) is arranged in the anoxic bin (33), the float box (331) is fixedly connected with the lifting plate (312) through a spring rod (332); a cleaning mechanism (4) for cleaning the lifting plate (312) by lifting the lifting plate (312) is arranged above the filter bin (32), a water inlet pipe (322) is arranged on the side wall of the filter bin (32) at the other side of the filter plate (321), a first stirring mechanism is arranged in the anaerobic bin (22), a second stirring mechanism is arranged in the anoxic bin (33), and an aeration mechanism for aerating the aerobic bin (23) is arranged in the gas supply bin (24); a drain pipe (341) is arranged on the side wall of the sedimentation bin (34), and a sludge discharge pipe (342) is arranged on the bottom surface of the sedimentation bin (34); a reflux pump (231) is arranged on the outer wall of the aerobic bin (23), the input end of the reflux pump (231) is communicated with the aerobic bin (23) through a pipeline, and the output end of the reflux pump (231) is communicated with the anoxic bin (33) through a pipeline; the second stirring mechanism comprises a second stirring shaft (333) horizontally arranged in the anoxic bin (33) and parallel to the vertical partition plate (11), and a second motor (334) fixedly arranged on the outer wall of the shell (1), both ends of the second stirring shaft (333) are rotatably and sealingly connected with the anoxic bin (33), and one end of the second stirring shaft (333) penetrates through the side wall of the anoxic bin (33) and is connected with the output shaft of the second motor (334). The cleaning mechanism (4) comprises a frame (41) arranged above the filter bin (32), a lead screw (42) arranged transversely in the frame (41) and parallel to the second stirring shaft (333), and a cleaning plate (43) slidingly arranged in the frame (41) and threadedly connected with the lead screw (42); the lead screw (42) is rotationally connected with the frame (41), one end of the lead screw (42) penetrates through the side wall of the frame (41) and is sleeved with a first pulley (44), one end of the second stirring shaft (333) is sleeved with a second pulley (335) for driving the first pulley (44) through a transmission belt, and one end of the frame (41) extends to the outside of the shell (1); The cleaning plate (43) extends to the outside of the frame (41) at both ends, and one end of the cleaning plate (43) is vertically provided with a top rod (45); one side of the filter plate (321) is vertically provided with a blowing plate (46), both ends of the blowing plate (46) are slidingly connected with the vertical sliding groove arranged on the inner wall of the filter bin (32), and the bottom surface of the vertical sliding groove is connected with the blowing plate (46) through a spring; both ends of the upper part of the blowing plate (46) are provided with a trough (461), and the blowing plate (46) between the two troughs (461) is provided with a peak (462) for cooperating with the top rod (45) to push the blowing plate (46) to slide up and down; the blowing plate (46) is provided with a plurality of air blowing ports for blowing the filter plate (321), a plurality of the air blowing ports are in communication with the air supply pipeline arranged transversely in the blowing plate (46), and the bottom of the blowing plate (46) is provided with a plurality of air bags (463), the plurality of air bags (463) are in communication with the air supply pipeline, and the air bags (463) are in contact with the fixed plate (311).

2. The device for removing total nitrogen from coking wastewater according to claim 1, characterized in that, The first stirring mechanism comprises a first stirring shaft (221) vertically arranged in the anaerobic bin (22), a motor plate (222) transversely arranged in the anaerobic bin (22), and a first motor (223) arranged on the motor plate (222); The lower end of the first stirring shaft (221) extends into the aerobic bin (23), and the first stirring shaft (221) is rotationally and sealingly connected with the first transverse partition plate (21); the upper end of the first stirring shaft (221) penetrates through the motor plate (222) and is fixedly connected with the output shaft of the first motor (223).

3. The device for removing total nitrogen from coking wastewater according to claim 2, characterized in that, The aeration mechanism is a gas pump (241) arranged in the gas supply bin (24); the lower end of the first stirring shaft (221) is fixedly connected with a gas distribution disc (232), the center of the gas distribution disc (232) is vertically provided with a gas passage, and the gas distribution disc (232) is provided with a plurality of gas distribution ports in communication with the gas passage; the gas pump (241) is rotationally connected and communicated with the gas passage through a gas distribution pipeline (242).

4. The device for removing total nitrogen from coking wastewater according to claim 1, characterized in that, The bottom surface of the sediment bin (34) is provided with a sludge conveying pump (343), the input end of the sludge conveying pump (343) is communicated with the side wall of the sludge discharge pipe (342) through a pipeline, and the output end of the sludge conveying pump (343) is communicated with the anaerobic bin (22) through a sludge conveying pipeline (344).

5. The total nitrogen removal device for BDS multi-stage treatment of coking wastewater according to claim 1, characterized in that, The blowing plate (46) is provided with a guide groove for cooperating with the ejector rod (45), and the ejector rod (45) is internally provided with a vertical lubricating oil channel for applying lubricating oil to the guide groove; The cleaning plate (43) is provided with a liquid storage tank (49), and the liquid storage tank (49) is internally provided with a third transverse partition plate (491) for separating the liquid storage tank (49) into a lubricating oil storage area and a medicament storage area arranged in sequence from top to bottom; The lubricating oil storage area is vertically provided with a fixed sleeve (494), and the side wall of the fixed sleeve (494) is provided with an oil outlet (492); the bottom surface of the medicament storage area is provided with a liquid outlet pipe (493); The upper end of the ejector rod (45) sequentially penetrates the liquid outlet pipe (493), the third transverse partition plate (491) and is in sliding sealing connection with the fixed sleeve (494), and the side wall of the ejector rod (45) is provided with a transverse lubricating oil channel for rotatingly connecting with the oil outlet; the transverse lubricating oil channel is in communication with the vertical lubricating oil channel; A gap for passing medicament is arranged between the liquid outlet pipe (493) and the ejector rod (45), and a sealing ring (451) for controlling the opening and closing of the liquid outlet pipe (493) by sliding up and down is arranged on the side wall of the ejector rod (45), and the sealing ring (451) and the third transverse partition plate (491) are connected by a spring; A rotating sleeve (47) is rotatably arranged on the ejector rod (45), the upper end of the rotating sleeve (47) penetrates the cleaning plate (43) and is in rotating sealing connection with the bottom surface of the liquid storage tank (49), the rotating sleeve (47) is in communication with the liquid outlet pipe (493), and a gear (471) and a liquid supply bin (472) are sequentially arranged on the rotating sleeve (47) from top to bottom, and a gap for passing medicament is arranged between the inner wall of the rotating sleeve (47) and the ejector rod (45); A rack (48) for engaging with the gear (471) is arranged on the outer wall of the frame (41), and a clamping mechanism for clamping with the ejector rod (45) is arranged on the side wall of the rotating sleeve (47); The liquid supply bin (472) is in rotating sealing connection with the rotating sleeve (47), and the inside of the liquid supply bin (472) is in communication with the rotating sleeve (47); one side of the liquid supply bin (472) is in sliding connection with the outer wall of the frame (41), and the other side of the liquid supply bin (472) is provided with a medicament applying pipe (473) in communication therewith.

6. The device for removing total nitrogen from coking wastewater according to claim 5, characterized in that, The clamping mechanism comprises a plurality of clamping columns threadedly connected with the side wall of the rotating sleeve (47), and the side wall of the ejector rod (45) is provided with a clamping groove for cooperating with the clamping columns.

7. A method for removing total nitrogen from coking wastewater in a multi-stage process of BDS, using the total nitrogen removal apparatus according to any one of claims 1 to 6, characterized by, The method comprises the following steps: S1, primary treatment: the wastewater is introduced into the filter bin (32) through the water inlet pipe, and the wastewater is filtered through the filter plate (321) to obtain filtered wastewater; S2, secondary treatment: S2-1, anaerobic reaction: the filtered wastewater flows into the anaerobic bin (22), and activated sludge, carbon source and nitrogen source are added into the anaerobic bin (22); the filtered wastewater is stirred by the first stirring mechanism to perform anaerobic reaction, and the wastewater after anaerobic reaction is obtained; S2-2, anaerobic reaction: the anaerobic reaction wastewater is introduced into the anoxic bin (33), and the anaerobic reaction wastewater is stirred by the second stirring mechanism to perform anaerobic reaction, and the anaerobic reaction wastewater is obtained; during the period, the cleaning mechanism (4) can clean the solid particles in the filtering bin (32); S3-3, aerobic reaction: the anaerobic reaction wastewater is introduced into the aerobic bin (23), and the aerobic reaction wastewater is aerated by the aeration mechanism to perform aerobic reaction, and the aerobic reaction wastewater is obtained; S3, tertiary treatment: the aerobic reaction wastewater is introduced into the sedimentation bin (34), and the aerobic reaction wastewater is precipitated, and the multi-stage treated wastewater is obtained after the precipitation is completed, and the multi-stage treated wastewater is discharged through the drain pipe (341).

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