Coking wastewater treatment system

Abstract

The utility model provides a coking wastewater treatment system. The system comprises an anoxic tank, an aerobic tank, a biochemical sedimentation tank, a rear denitrification tank, a re-aeration tank, a re-aeration sedimentation tank and a physicochemical treatment device which are sequentially connected in series through pipelines, the partition plates divide the anoxic tank into a plurality of cavities, and at least one through hole is formed in each partition plate; an outlet of the water distribution pipe is positioned on one side of the anoxic tank, and the water distribution pipe is used for conveying liquid into the anoxic tank through the top of one cavity of the anoxic tank; and the flow pushing device is arranged in the anoxic tank. According to the device, the retention time and the reaction time of liquid in the anoxic tank are prolonged, the treatment efficiency is improved, and the total nitrogen is further removed through the arrangement of the rear denitrification tank, so that the ammonia nitrogen removal rate of the coking wastewater is improved, and the finally discharged liquid can stably reach the standard without adding biological stuffing into the anoxic tank.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a coking wastewater treatment system. Background Art

[0002] Coking wastewater is mainly ammonia evaporation wastewater, which is a typical high-concentration, difficult-to-degrade organic industrial wastewater, mainly containing toxic and harmful pollutants such as ammonia nitrogen, phenols, cyanide, and benzene. After the implementation of the "Pollutant Emission Standard for Coking Chemical Industry" (GB16171-2012), the discharge of this type of wastewater has become an industry problem. Previously, domestic coking wastewater treatment facilities were designed and built in accordance with the "Pollutant Emission Standard for Coking Chemical Industry" (GB 16171-1996). The AAO (Anaerobic-Anoxic-Oxic) method was generally used for biochemical treatment in the process. The COD, ammonia nitrogen, total nitrogen and other indicators of the treated wastewater could not meet the national emission standards.

[0003] The anoxic tank is an indispensable part of the AAO method, and it is also a very important part. It has a good treatment effect on total nitrogen, ammonia nitrogen, COD, etc. in wastewater. Anoxic tank generally refers to a biochemical system in which the dissolved oxygen is controlled between 0.2-0.5 mg / l. When there are a large amount of nitrates, nitrites and sufficient organic matter, denitrification and denitrification reactions can be carried out in this tank (area). Generally speaking, the anoxic tank is fed with liquid through a water distribution pipe. The existing water distribution pipes are mostly arranged at the bottom of the anoxic tank, and the liquid is fed upward. Not only does it use a lot of water distribution pipes, which are prone to corrosion and leakage, and difficult to repair, but also because the anoxic tank is not aerated like an aerobic tank, after long-term operation, the water distribution of the anoxic tank is prone to unevenness, especially dead corners are prone to appear around the tank body. The existing coking wastewater treatment system also has the disadvantage that the biological contact reaction time is difficult to control. The biological contact reaction time, that is, the surface load, is actually the rising speed of the coking wastewater in the anoxic tank. This data plays a great role in the anoxic reaction, especially for the conventional upflow anoxic tank. If the surface load is small, the gas produced by the anoxic reaction cannot be volatilized well, which is easy to cause anoxic bacteria poisoning, so that the anoxic reaction cannot proceed well or proceeds slowly, thereby affecting the ammonia nitrogen removal rate of the anoxic tank. However, if the specific surface area is large, it is easy to cause anaerobic sludge to float and flow. In addition, the biological filler dosage ratio in the anoxic tank is not easy to control, and professionals are required to adjust it according to the actual situation. Moreover, after long-term operation, the biological filler will age and fall off, which is not easy to replace, thereby affecting the biological reaction. In short, how to improve the denitrification efficiency and reduce the total nitrogen index has always been the research direction of the industry. Utility Model Content

[0004] The purpose of the utility model is to provide a coking wastewater treatment system. The utility model increases the residence time and reaction time of the liquid in the anoxic tank, improves the treatment efficiency, and the setting of the post-denitrification tank further removes the total nitrogen, thereby improving the ammonia nitrogen removal rate of the coking wastewater. The final discharged liquid can be stably up to the standard without adding biological fillers to the anoxic tank.

[0005] In order to achieve the above object, the utility model provides a coking wastewater treatment system, which includes:

[0006] Anoxic tank, aerobic tank, biochemical sedimentation tank, post-denitrification tank, re-aeration tank, re-aeration sedimentation tank and physicochemical treatment device connected in series through pipelines;

[0007] A partition plate, wherein the partition plate divides the anoxic pool into a plurality of cavities, and the partition plate has at least one through hole;

[0008] a water distribution pipe, the outlet of which is located at one side of the anoxic pool, and is used to transport liquid into the anoxic pool through the top of one of the cavities of the anoxic pool;

[0009] A flow-pushing device is arranged in the anoxic pool.

[0010] Optionally, the physicochemical treatment device includes a physicochemical reaction tank and a physicochemical precipitation tank connected by a pipeline, and the physicochemical precipitation tank is located at the downstream end of the physicochemical reaction tank.

[0011] Optionally, the physicochemical treatment device includes a filter, and the filter is connected to the downstream end of the physicochemical sedimentation tank through a pipeline.

[0012] Optionally, the coking wastewater treatment system includes a sludge treatment device, which includes a sludge thickening tank and a sludge dewatering machine connected by pipelines, the sludge dewatering machine is located at the downstream end of the sludge thickening tank, and the sludge thickening tank is respectively connected to the biochemical sedimentation tank, the re-aeration sedimentation tank and the physicochemical treatment device through pipelines.

[0013] Optionally, the coking wastewater treatment system includes a flotation device, a pre-cyanide removal device and a regulating tank which are sequentially connected in series through pipelines, and the downstream end of the regulating tank is connected to the upstream end of the anoxic tank through the water distribution pipe.

[0014] Optionally, the coking wastewater treatment system includes a scum tank, and the scum tank is connected to the flotation device through a pipeline.

[0015] Optionally, the coking wastewater treatment system includes a first return pipe, which is used to return part of the sludge in the biochemical sedimentation tank to the anoxic tank.

[0016] Optionally, the coking wastewater treatment system includes a second return pipe, which is used to return part of the sludge in the re-aeration sedimentation tank to the re-aeration tank.

[0017] Optionally, the coking wastewater treatment system includes a mixed liquor reflow tank, which is located between the aerobic tank and the biochemical sedimentation tank, and is used to return a portion of the liquid in the mixed liquor reflow tank to the anoxic tank, and to transport another portion of the liquid in the mixed liquor reflow tank to the biochemical sedimentation tank.

[0018] Optionally, the coking wastewater treatment system includes a biochemical effluent pool, the upstream end of the biochemical effluent pool is connected to the biochemical sedimentation tank through a pipeline, and the downstream end of the biochemical effluent pool is connected to the post-denitrification tank through a pipeline.

[0019] As configured above, the utility model divides the anoxic pool into multiple cavities, and arranges the outlet of the water distribution pipe on one side of the anoxic pool, that is, the liquid enters the anoxic pool from one of the cavities located on the side, thereby extending the flow time of the liquid, increasing the residence time and reaction time of the liquid in the anoxic pool, and the liquid enters the anoxic pool from the top of the cavity, that is, the anoxic pool adopts an upper liquid inlet method, compared with the prior art in which the water distribution pipe is arranged at the bottom of the anoxic pool and the liquid is inletted upward, the corrosion and leakage probability of the water distribution pipe is greatly reduced, and the material of the water distribution pipe is saved; the flow plug device fully stirs and mixes the liquid in the anoxic pool to make the water distribution in the anoxic pool more uniform, effectively increasing the contact reaction time between the organism and the liquid, improving the treatment efficiency, and avoiding the occurrence of anoxic bacteria poisoning and affecting the biological activity; the rear end of the biochemical sedimentation tank is provided with a post-denitrification tank to improve the efficiency of denitrification, so that the anoxic pool does not need to add biological filler, which greatly reduces the maintenance of the biological filler in the wastewater treatment system, so that the anoxic pool maintains long-term stable operation. In summary, the utility model increases the residence time and reaction time of the liquid in the anoxic tank, fully mixes the liquid in the anoxic tank, increases the contact reaction time between the organism and the liquid, and improves the treatment efficiency. The setting of the post-denitrification tank further removes the total nitrogen, thereby improving the ammonia nitrogen removal rate of the coking wastewater. There is no need to add biological fillers to the anoxic tank to ensure that the final discharged liquid can stably meet the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Those skilled in the art should understand that the drawings provided are for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0021] Figure 1 This is a flow chart of a coking wastewater treatment system according to an embodiment of the utility model;

[0022] Figure 2A schematic diagram of an anoxic tank and water distribution pipes of a coking wastewater treatment system according to an embodiment of the utility model;

[0023] Figure 3 for Figure 2 A-direction view.

[0024] The reference numerals are as follows:

[0025] 10- anoxic pool; 11- partition plate; 12- water distribution pipe. DETAILED DESCRIPTION

[0026] In this document, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", "front", "back", "top", "bottom", etc. are used to indicate directions or positional relationships based on the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction and operation. Therefore, they cannot be understood as limiting the present invention.

[0027] The following will describe the specific implementation of the utility model in more detail with reference to the schematic diagram. The advantages and features of the utility model will become clearer according to the following description. It should be noted that the drawings are all in a very simplified form and are not in exact proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model.

[0028] Figure 1 This is a flow chart of a coking wastewater treatment system according to an embodiment of the utility model. Figure 2 It is a schematic diagram of an anoxic tank and water distribution pipes of a coking wastewater treatment system according to an embodiment of the utility model. Figure 3 for Figure 2 Please refer to Figure 1 , Figure 2 and Figure 3 The embodiment of the utility model provides a coking wastewater treatment system, which includes a water distribution pipe, a flow plugging device, a physicochemical treatment device, and an anoxic tank, an aerobic tank, a biochemical sedimentation tank, a post-denitrification tank, a re-aeration tank, and a re-aeration sedimentation tank connected in series through pipelines.

[0029] The coking wastewater treatment system also includes an air flotation device, a pre-cyanide removal device and an adjusting tank which are connected in series in sequence through pipelines, and the downstream end of the adjusting tank is connected to the upstream end of the anoxic tank through a water distribution pipe 12. Exemplarily, the air flotation device receives ammonia vapor wastewater and liquid from the accident tank, and the scum of the air flotation device enters the scum tank and then enters the coal tar ammonia water separator for treatment. The liquid of the air flotation device enters the pre-cyanide removal device. The odor from the air flotation device, the pre-cyanide removal device and the adjusting tank is transported to the waste gas treatment device for treatment and then discharged after meeting the standards. Cyanide removal agent and coagulant can be added to the pre-cyanide removal device, and the cyanide removal agent is used to remove cyanide contamination in the liquid. The adjusting tank can receive domestic sewage, special production wastewater, liquid from the pre-cyanide removal device and liquid from the regional pit, and then the liquid in the adjusting tank enters the anoxic tank, and phosphate salts can be added before entering the anoxic tank.

[0030] The anoxic pool is provided with a partition plate 11, which divides the anoxic pool 10 into a plurality of cavities. The partition plate 11 has at least one through hole. The outlet of the water distribution pipe 12 is located on one side of the anoxic pool, and is used to transport the liquid to the anoxic pool through the top of one of the cavities of the anoxic pool; specifically, taking the anoxic pool divided into two cavities by a partition plate as an example, the partition plate may have two square holes, and the square holes are located at the bottom of the partition plate, and the outlet of the water distribution pipe is located at the top of one side of the anoxic pool, please refer to Figure 2 and Figure 3 Compared with the prior art method of introducing liquid from the bottom center of the anoxic tank cavity, the utility model introduces liquid from one side of a cavity on the side, and then flows into another cavity through the through hole on the partition plate, which lengthens the flow path of the liquid and prolongs the flow time of the liquid in the anoxic tank, thereby increasing the residence time and reaction time of the liquid in the anoxic tank, and enhancing the treatment effect of the anoxic tank. The connecting pipe between the anoxic tank and the aerobic tank is located at the upper part of the anoxic tank. Compared with the prior art method of the connecting pipe between the anoxic tank and the aerobic tank being located at the lower part of the anoxic tank, the utility model can realize the separate maintenance and emptying of the anoxic tank or the aerobic tank, and increase the residence time of the liquid in the anoxic tank.

[0031] The flow-pushing device is arranged in the anoxic tank. It is understandable that a flow-pushing device is arranged in each cavity of the anoxic tank to fully stir and mix the liquid in the anoxic tank, make the water distribution in the anoxic tank more uniform, and avoid sludge deposition affecting the treatment effect, effectively increase the contact reaction time between the organism and the liquid, improve the treatment efficiency, and avoid the situation where the anoxic bacteria are poisoned and affect the biological activity. For example, the flow-pushing device is a low-speed flow-pushing device, and a submersible mixer can be used.

[0032] The physicochemical treatment device is connected to the downstream end of the re-aeration sedimentation tank through a pipeline. Furthermore, the physicochemical treatment device includes a physicochemical reaction tank and a physicochemical sedimentation tank connected by a pipeline, and the physicochemical sedimentation tank is located at the downstream end of the physicochemical reaction tank. The physicochemical treatment device plays the role of a "gatekeeper", further removing organic matter and other pollutants in the liquid to ensure that the liquid is stably discharged in compliance with standards. Exemplarily, the physicochemical treatment device includes a filter, and the downstream end of the physicochemical sedimentation tank is connected to the filter and the final water outlet tank in sequence through a pipeline. Preferably, part of the liquid in the final water outlet tank can be used to clean the filter, and the backwash discharge water after the filter is cleaned can enter the physicochemical reaction tank through a pipeline, which also has a cleaning effect on the physicochemical reaction tank, saving costs, energy conservation and environmental protection.

[0033] The coking wastewater treatment system includes a first return pipe, which is used to return part of the sludge in the biochemical sedimentation tank to the anoxic tank to improve the treatment effect of the anoxic tank. The coking wastewater treatment system includes a second return pipe, which is used to return part of the sludge in the re-aeration sedimentation tank to the re-aeration tank. The sludge in the re-aeration sedimentation tank contains microorganisms and can be returned to the re-aeration tank for reuse to promote the reaction in the re-aeration tank and also save costs.

[0034] The coking wastewater treatment system includes a sludge treatment device, which includes a sludge thickening tank and a sludge dewatering machine connected by pipelines. The sludge dewatering machine is located at the downstream end of the sludge thickening tank. The sludge thickening tank is connected to the biochemical sedimentation tank, the re-aeration sedimentation tank and the physicochemical treatment device through pipelines. Specifically, the sludge thickening tank is connected to the downstream end of the physicochemical sedimentation tank through a pipeline. It can be understood that part of the sludge in the biochemical sedimentation tank is returned to the anoxic tank, and another part of the sludge is discharged to the sludge thickening tank. The sludge of the pre-cyanide removal device is discharged into the sludge thickening tank through a pipeline, the sludge of the physicochemical sedimentation tank is discharged into the sludge thickening tank through a pipeline, part of the sludge in the re-aeration sedimentation tank is returned to the re-aeration tank, and another part of the sludge in the re-aeration sedimentation tank is discharged to the sludge thickening tank. The downstream end of the sludge thickening tank transports the sludge to the sludge dewatering machine through a pipeline, and the sludge is transported to sintering after being treated by the sludge dewatering machine. Filtrate from sludge thickening tanks and sludge dewaterers can be transported to regional pits.

[0035] Exemplarily, the coking wastewater treatment system also includes a mixed liquor reflow tank, which is located between the aerobic tank and the biochemical sedimentation tank, and is used to return part of the liquid in the mixed liquor reflow tank to the anoxic tank, and to transport another part of the liquid in the mixed liquor reflow tank to the biochemical sedimentation tank.

[0036] The coking wastewater treatment system comprises a biochemical effluent pool, the upstream end of which is connected to a biochemical sedimentation tank through a pipeline, and the downstream end of which is connected to a post-denitrification tank through a pipeline.

[0037] This embodiment also provides a coking wastewater treatment method, which is based on the same inventive concept as the above coking wastewater treatment system. The coking wastewater treatment method includes steps S1, S2, S3, S4 and S5, which are described in detail below.

[0038] Step S1: The liquid is introduced into one of the chambers of the anoxic tank from the top of one side of the anoxic tank and stirred by a flow-pushing device. Furthermore, the anoxic tank uses activated sludge. The microorganisms in the activated sludge use the carbon source in the liquid to perform denitrification reaction, removing part of the NO2 in the water. - and NO3 - Restore to N 2 Escape, reduce the total nitrogen content in the liquid. The anoxic pool does not need to be filled with biological fillers. In the prior art, traditional hanging biological fillers are usually placed in the anoxic pool. Therefore, the utility model greatly reduces the maintenance of the fillers.

[0039] Step S2: The liquid from the anoxic pool is transported to the aerobic pool, and a suspended filler is placed in the aerobic pool. For example, the aerobic pool is divided into two connected cavities, and the two cavities are in a series relationship. MBBR suspended filler is placed in the cavity at the upstream end, which can be made of polyurethane and has a specific surface area of ​​more than 2000m in dry state. 2 / m 3 , which can ensure the nitrification effect of the system and prepare for denitrification. It can be understood that the fluidized bed filler is also called MBBR suspended filler, which is used in the aerobic biological fluidized bed process. The MBBR suspended filler adopts a three-dimensional hollow structure as an aerobic biological carrier. During normal operation, the filler will be suspended in the water. Furthermore, defoaming water, defoaming agent and alkali can be added to the aerobic tank.

[0040] Preferably, the liquid is transported from the aerobic tank to the mixed liquid return tank, and then a portion of the liquid in the mixed liquid return tank is returned to the anoxic tank and another portion of the liquid is transported to the biochemical sedimentation tank.

[0041] Step S3: The liquid is transported to the biochemical sedimentation tank. Further, after the liquid comes out of the biochemical sedimentation tank, it enters the biochemical effluent tank.

[0042] Step S4: transport the liquid to the post-denitrification tank to denitrify the liquid, use the denitrification of microorganisms to remove the residual nitrate nitrogen in the liquid, add carbon source and composite filler to the post-denitrification tank. It can be understood that the composite filler is composed of fiber bundles, plastic sheets, sleeves, and central ropes. It is characterized by no blockage, no agglomeration, large specific surface area, rapid biofilm, long service life, resistance to high load impact, good inflation performance, and is suitable for various sewage and wastewater treatment projects. The composite filler provides a carrier for the growth of microorganisms, and the wastewater undergoes a denitrification reaction under the action of microorganisms to remove residual nitrate nitrogen in the wastewater. Preferably, a sludge pump is provided in the post-denitrification tank to regularly discharge the sludge at the bottom of the post-denitrification tank to prevent too much sludge from affecting the treatment effect of the post-denitrification tank. The sludge can be discharged to the re-aeration tank.

[0043] It is understandable that the denitrification tank is a biological filter with denitrification and denitrification functions. The denitrification tank can be divided into a pre-denitrification tank and a post-denitrification tank. Among them, the post-denitrification tank is more suitable for wastewater with significantly low organic matter content (industrial wastewater has a high specific gravity) or for deep denitrification.

[0044] The MBBR suspended filler and combined filler mentioned in this embodiment are both biological fillers.

[0045] Step S5: The liquid from the post-denitrification tank is sequentially transported to the re-aeration tank, the re-aeration sedimentation tank and the physicochemical treatment device. It is understandable that in order to prevent the excessive addition of carbon source in the post-denitrification tank from causing COD (chemical oxygen demand) to exceed the standard, a re-aeration tank is set at the downstream end of the post-denitrification tank to remove the COD index that may exceed the standard and remove the chemical oxygen demand in the liquid caused by the excess carbon source added in the denitrification stage.

[0046] The liquid enters the re-aeration tank to remove the remaining chemical oxygen demand in the liquid, and then enters the re-aeration sedimentation tank for mud and water separation. The supernatant after mud and water separation is transported to the subsequent physical and chemical treatment device, and part of the sludge in the re-aeration sedimentation tank is returned to the re-aeration tank, and another part of the sludge in the re-aeration sedimentation tank is discharged to the sludge thickening tank. Defoaming water can be added to the re-aeration tank.

[0047] The physicochemical treatment device comprises a physicochemical reaction tank and a physicochemical sedimentation tank connected by pipelines. The liquid from the aeration sedimentation tank is transported to the physicochemical reaction tank and the physicochemical sedimentation tank in sequence. Coagulant, coagulant aid and alkali can be added to the physicochemical reaction tank.

[0048] The number of reaction tanks such as anoxic tanks, post-denitrification tanks, and re-aeration tanks can be two in parallel, achieving the effect of one backup and one use. The size of the anoxic tank can be, for example, 18m×8.5m×8.5m; the size of the post-denitrification tank can be, for example, 10m×8m×8.5m, with an effective water depth of 8m and a single effective volume of 640m 3 The size of the aeration tank can be, for example, 10.0m×8.0m×7.0m, with an effective water depth of 6.0m and a single effective volume of 480m 3 .

[0049] As configured above, the utility model divides the anoxic pool into multiple cavities, and arranges the outlet of the water distribution pipe on one side of the anoxic pool, that is, the liquid enters the anoxic pool from one of the cavities located on the side, thereby extending the flow time of the liquid, increasing the residence time and reaction time of the liquid in the anoxic pool, and the liquid enters the anoxic pool from the top of the cavity, that is, the anoxic pool adopts an upper liquid inlet method, compared with the prior art in which the water distribution pipe is arranged at the bottom of the anoxic pool and the liquid is inletted upward, the corrosion and leakage probability of the water distribution pipe is greatly reduced, and the material of the water distribution pipe is saved; the flow plug device fully stirs and mixes the liquid in the anoxic pool to make the water distribution in the anoxic pool more uniform, effectively increasing the contact reaction time between the organism and the liquid, improving the treatment efficiency, and avoiding the occurrence of anoxic bacteria poisoning and affecting the biological activity; the rear end of the biochemical sedimentation tank is provided with a post-denitrification tank to improve the efficiency of denitrification, so that the anoxic pool does not need to add biological filler, which greatly reduces the maintenance of the biological filler in the wastewater treatment system, so that the anoxic pool maintains long-term stable operation. In summary, the utility model increases the residence time and reaction time of the liquid in the anoxic tank, fully mixes the liquid in the anoxic tank, increases the contact reaction time between the organism and the liquid, and improves the treatment efficiency. The setting of the post-denitrification tank further removes total nitrogen, thereby improving the ammonia nitrogen removal rate of the coking wastewater. There is no need to add biological fillers to the anoxic tank to ensure that the final discharged liquid can stably meet the standards.

[0050] The upstream and downstream mentioned in this embodiment refer to the front and back order in the process direction.

[0051] It should be noted that references to "one embodiment", "an embodiment", "a specific embodiment", "some embodiments", etc. in the specification only indicate that the described embodiment may include a particular feature, structure or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure or characteristic is described in conjunction with an embodiment, whether or not explicitly described, it is within the knowledge of a person skilled in the relevant art to implement such feature, structure or characteristic in conjunction with other embodiments.

[0052] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0053] It should also be noted that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the above disclosed technical content can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

[0054] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are merely used to distinguish between the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0055] It should also be recognized that the terms described herein are only used to describe specific embodiments and are not used to limit the scope of the utility model. It must be noted that the singular forms "one" and "a kind" used herein and in the appended claims include plural references unless the context clearly indicates the opposite meaning. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood to have a logical "or" definition, rather than a logical "exclusive or" definition, unless the context clearly indicates the opposite meaning. In addition, the implementation of the method and / or device in the embodiment of the utility model may include performing the selected task manually, automatically, or in combination.

Claims

1. A coking wastewater treatment system, characterized in that: include: Anoxic tank, aerobic tank, biochemical sedimentation tank, post-denitrification tank, re-aeration tank, re-aeration sedimentation tank and physicochemical treatment device connected in series through pipelines; A partition plate, wherein the partition plate divides the anoxic pool into a plurality of cavities, and the partition plate has at least one through hole; a water distribution pipe, the outlet of which is located at one side of the anoxic pool, and is used to transport liquid into the anoxic pool through the top of one of the cavities of the anoxic pool; A flow-pushing device is arranged in the anoxic pool.

2. The coking wastewater treatment system according to claim 1, characterized in that: The physicochemical treatment device comprises a physicochemical reaction tank and a physicochemical precipitation tank connected by a pipeline, and the physicochemical precipitation tank is located at the downstream end of the physicochemical reaction tank.

3. The coking wastewater treatment system according to claim 2, characterized in that: The physicochemical treatment device comprises a filter, and the filter is connected to the downstream end of the physicochemical sedimentation tank through a pipeline.

4. The coking wastewater treatment system according to claim 1, characterized in that: The coking wastewater treatment system includes a sludge treatment device, which includes a sludge thickening tank and a sludge dewatering machine connected by pipelines. The sludge dewatering machine is located at the downstream end of the sludge thickening tank. The sludge thickening tank is connected to the biochemical sedimentation tank, the re-aeration sedimentation tank and the physicochemical treatment device through pipelines.

5. The coking wastewater treatment system according to claim 1, characterized in that: The coking wastewater treatment system comprises an air flotation device, a pre-cyanide removal device and a regulating tank which are sequentially connected in series through pipelines, and the downstream end of the regulating tank is connected to the upstream end of the anoxic tank through the water distribution pipe.

6. The coking wastewater treatment system according to claim 5, characterized in that: The coking wastewater treatment system comprises a scum tank, and the scum tank is connected to the air flotation device through a pipeline.

7. The coking wastewater treatment system according to claim 1, characterized in that: The coking wastewater treatment system comprises a first return pipe, which is used to return part of the sludge in the biochemical sedimentation tank to the anoxic tank.

8. The coking wastewater treatment system according to claim 1, characterized in that: The coking wastewater treatment system comprises a second return pipe, which is used to return part of the sludge in the re-aeration sedimentation tank to the re-aeration tank.

9. The coking wastewater treatment system according to claim 1, characterized in that: The coking wastewater treatment system includes a mixed liquor reflow tank, which is located between the aerobic tank and the biochemical sedimentation tank and is used to return a portion of the liquid in the mixed liquor reflow tank to the anoxic tank and to transport another portion of the liquid in the mixed liquor reflow tank to the biochemical sedimentation tank.

10. The coking wastewater treatment system according to claim 1, characterized in that: The coking wastewater treatment system comprises a biochemical effluent pool, the upstream end of which is connected to the biochemical sedimentation pool via a pipeline, and the downstream end of which is connected to the post-denitrification pool via a pipeline.

Images