CN218879602U - Biochemical method coal chemical industry sewage treatment system - Google Patents
Biochemical method coal chemical industry sewage treatment system Download PDFInfo
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- CN218879602U CN218879602U CN202222677162.1U CN202222677162U CN218879602U CN 218879602 U CN218879602 U CN 218879602U CN 202222677162 U CN202222677162 U CN 202222677162U CN 218879602 U CN218879602 U CN 218879602U
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Abstract
The utility model relates to the technical field of sewage treatment, in particular to a biochemical coal chemical sewage treatment system, which comprises an anoxic tank, an aerobic tank and a secondary sedimentation tank which are sequentially communicated according to the sewage treatment direction; and the anoxic pond and the aerobic pond are internally and respectively provided with a box cage in a hoisting manner, and the box cage is filled with MBBR filler. The utility model also provides a sewage treatment method, which is used for the sewage treatment system of the biochemical coal chemical industry to complete sewage treatment. The biochemical coal chemical wastewater treatment system can increase the tolerance of water quality and water quantity change, enhance the impact load resistance and ensure the stable water quality of the effluent; and the MBBR filler is added to create an environment which is beneficial to the attachment and survival of microorganisms, and meanwhile, the COD content and the ammonia nitrogen discharge concentration in the sewage are reduced by more than 30 percent compared with the actual operation, and the total nitrogen and total phosphorus discharge concentration is reduced by more than 15 percent compared with the actual operation.
Description
Technical Field
The utility model relates to a sewage treatment technical field specifically is a biochemical coal chemical industry sewage treatment system.
Background
Coal chemical wastewater is divided into three types, namely coking wastewater, coal gasification wastewater and coal liquefaction wastewater, coal is used as a raw material, the quality of the produced wastewater is different according to different processes for producing products, but the total wastewater is large in water quantity, complex in water quality and high in pollutant concentration, and the effective treatment of the coal chemical wastewater is a key point of environmental protection treatment all the time.
The existing coal chemical wastewater treatment process comprises the following stages: 1. pretreatment: the method comprises oil removal, air flotation, electrocatalysis and the like, and is mainly used for removing oil, reducing SS (suspended substances) and removing refractory organic matters, so that the biodegradability of a system is improved; 2. biochemical treatment: the method comprises the steps that waste water treatment systems such as A/O, A/A/O, oxidation ditch, SBR and the like reduce organic matters, ammonia nitrogen, total phosphorus and the like in waste water; 3. deep treatment: BAF, ozone, MBR, membrane systems (nanofiltration, ultrafiltration, reverse osmosis and the like), evaporation systems and the like further reduce pollutants in the wastewater, thereby achieving the purpose of water quality recycling or zero discharge.
The biochemical system is used as a ring which is started from the top in the whole coal chemical wastewater treatment, if the biochemical tank can not stabilize the effluent, the stable operation of the subsequent system is directly influenced, the higher COD, total nitrogen, total phosphorus and the like in the effluent water quality can nourish the water body of the membrane system, the microorganism is bred, and the consumption of the bactericide is increased; organic matters on the concentrated water side of the reverse osmosis membrane can be enriched, the pollution and blockage are frequent, a large amount of chemical cleaning agents are consumed, the service life of the reverse osmosis membrane is influenced, and the system treatment capacity is also influenced; the operation effect of the dehydrator is poor after the enrichment of organic matters, total nitrogen and the like in the evaporative crystallization system, the amount of discharged mother liquor is increased, and the quality of crystallized salt is influenced. Therefore, under the condition of not changing the tank capacity of the existing biochemical system, the improvement of the stability of the effluent quality of the biochemical system and the improvement of the removal rate have profound significance for the treatment of the whole coal chemical industry wastewater. In view of this, we propose a biochemical coal chemical industry sewage treatment system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a biochemical coal chemical industry sewage treatment system to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a biochemical coal chemical sewage treatment system comprises an anoxic tank, an aerobic tank and a secondary sedimentation tank which are sequentially communicated according to a sewage treatment direction;
a water inlet pump is arranged outside the anoxic tank through a pipeline to input sewage to be treated, and a sludge discharge pump of the anoxic tank returns the sewage to supplement the sludge concentration in the tank;
an aeration pipe is arranged at the bottom of the aerobic tank, a plurality of groups of aerators are arranged on the aeration pipe, and sewage in the tank is returned to the anoxic tank for further treatment through a mixed liquid return pump arranged outside the aerobic tank;
a central guide cylinder is arranged in the secondary sedimentation tank to precipitate sewage, sludge at the bottom of the secondary sedimentation tank is transported out through a sludge discharge pump after precipitation, and the precipitated effluent is discharged outside;
and box cages are hung in the anoxic tank and the aerobic tank, and MBBR fillers are filled in the box cages.
Preferably, the outlet pipeline of the water inlet pump, the outlet pipeline of the mixed liquid reflux pump and the outlet pipeline of the sludge discharge pump are all provided with an electromagnetic flowmeter and a valve.
Preferably, a stirrer is arranged in the anoxic tank to stir the sewage.
Preferably, an aeration fan is installed at one end of the aeration pipe extending out of the aerobic tank.
Preferably, the bottom of the secondary sedimentation tank is funnel-shaped.
Preferably, the upper end of the box cage is connected with steel beams through a plurality of groups of lifting ropes, and the steel beams are placed on the tank edges of the anoxic tank and the aerobic tank.
Preferably, the specific surface area of the MBBR filler is more than 800m 2 /m 3 The number of piled layers is 337500 pieces/m 3 。
Preferably, the specific surface area of the MBBR filler is more than 500m 2 /m 3 The number of stacks was 135000/m 3 。
Compared with the prior art, the beneficial effects of the utility model are that: according to the biochemical coal chemical wastewater treatment system and method, the MBBR filler is fixed in the anoxic tank and the aerobic tank in a cage mode, so that the filler can be prevented from being accumulated in a water outlet area along with water flow, the biomass and the biological species in the tanks are improved, air bubbles are finer due to the collision and shearing action of the filler in water, the oxygen utilization rate in the aerobic tank is increased, the growth of sludge is facilitated, the concentration of the sludge is increased, the resistance of the biochemical tank to the change of water quality and water quantity is increased, the impact load resistance is enhanced, and the stability of the water quality of the outlet water is ensured; meanwhile, the MBBR filler is added to create an environment beneficial to microorganism attachment and survival, the COD content and ammonia nitrogen emission concentration in the sewage are reduced by more than 30% compared with the actual operation, the filler can create an environment beneficial to microorganism attachment and survival, and the total nitrogen and total phosphorus emission concentration is reduced by more than 15% compared with the actual operation.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. an anoxic tank; 11. a water inlet pump; 12. a blender; 2. an aerobic tank; 21. an aeration pipe; 211. an aerator; 22. a mixed liquid reflux pump; 23. an aeration fan; 3. a secondary sedimentation tank; 31. a central draft tube; 32. a sludge discharge pump; 4. a cage; 41. MBBR filler; 42. a lifting rope; 43. a steel beam; 5. an electromagnetic flow meter; 6. and (4) a valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate. In the description of the present invention, "plurality" means two or more unless specifically limited otherwise.
At present, in order to improve the removal rate and impact load resistance of a biochemical tank, filling materials are arranged in the tank and the tank body is expanded in a common way. The mode of setting the filler is common in a newly-built tank body, if the common combined filler and the common elastic filler are added into an operating sewage station area and a fixed support needs to be set, the whole sewage station area needs to be shut down in the transformation, and further the plant area needs to be shut down for technical improvement, so that the influence on production is large; influenced by service life and film forming efficiency, the service life is only 5-10 years, and the filler needs to be replaced regularly; the expansion of the pool body is limited by the field and the cost, and the implementation has certain difficulty.
The MBBR filler has the characteristics of large specific surface area, long service life (more than or equal to 15 years), short film forming time, good hydrophilicity, capability of adding the filler under the condition that a biochemical pool is not stopped, and the like, and also has application in improving the removal rate of COD and ammonia nitrogen in coal chemical wastewater.
Chinese patents of application numbers 201820341779.7 and 201810458387.3 focus on describing the front and rear filler interception mode, the tank stirring mode, the aeration mode and the like of the MBBR biochemical tank body; the MBBR filler and the specific COD and ammonia nitrogen removal efficiency are described less, and the MBBR filler is dispersed in a biochemical pool, so that an aeration system and a stirring system are limited to a certain extent in order to ensure the fluidization state of the filler, and the stirring and aeration system modification also involves the problem of production stop. The embodiment focuses on the fact that the influence of the MBBR membrane on the water quality stability of the biochemical system and the removal of ammonia nitrogen, total nitrogen and total phosphorus is specifically inspected on the basis that the original biochemical system is not changed.
Example 1
A biochemical coal chemical industry sewage treatment system is shown in figure 1, and an anoxic tank 1, an aerobic tank 2 and a secondary sedimentation tank 3 are sequentially communicated according to a sewage treatment direction; the exterior of the anoxic tank 1 is provided with a water inlet pump 11 through a pipeline to input sewage to be treated, and the anoxic tank 1 also partially reflows sludge through a sludge discharge pump; the bottom of the aerobic tank 2 is provided with an aeration pipe 21, the aeration pipe 21 is provided with a plurality of groups of aerators 211, and the outside of the aerobic tank 2 is provided with a mixed liquid reflux pump 22 to reflux the sewage in the tank to the anoxic tank 1 for further treatment; a central guide cylinder 31 is arranged in the secondary sedimentation tank 3 to precipitate the sewage, the sludge at the bottom of the tank is transported out by a sludge discharge pump 32 after precipitation, and the precipitated effluent is discharged outside; case cage 4 has all been hoisted in oxygen deficiency pond 1 and the good oxygen pond 2, and the incasement of case cage 4 is filled with MBBR filler 41.
It should be noted that the outlet line of the water inlet pump 11, the outlet line of the mixed liquid reflux pump 22, and the outlet line of the sludge discharge pump 32 are provided with the electromagnetic flow meter 5 and the valve 6. The flow of each pump body outlet is convenient to record and control through the electromagnetic flow meter 5, and meanwhile the valve 6 is convenient to control the opening and closing of the pipeline.
Further, a stirrer 12 is arranged in the anoxic tank 1 to stir the sewage. So that the sewage in the anoxic tank 1 can be fully subjected to anoxic treatment by the stirrer 12.
It is worth to be noted that one end of the aeration pipe 21 extending out of the aerobic tank 2 is provided with an aeration fan 23. So that the sewage in the tank can be sufficiently aerobically treated by inputting air through the aeration fan 23 and by the aeration pipe 21 and the aerator 211.
In addition, the bottom of the secondary sedimentation tank 3 is funnel-shaped. The sludge is convenient to deposit and then enters the bottom of the tank for collection and then is transported outside.
Specifically, the upper end of the cage 4 is connected with a steel beam 43 through a plurality of sets of lifting ropes 42, and the steel beam 43 is placed on the tank edges of the anoxic tank 1 and the aerobic tank 2. The box cage 4 can be hung in the anoxic tank 1 and the aerobic tank 2 by the mutual matching of the arranged steel beams 43 and the lifting ropes 42, and the filler is prevented from being accumulated in a water outlet area along with water flow.
It is noteworthy that the specific surface area of the MBBR filler 41 is greater than 800m 2 /m 3 The number of the stacks is 337500/m 3 (ii) a The specific surface area of the MBBR filler 41 is more than 500m 2 /m 3 The number of stacks was 135000/m 3 . In the embodiment, the two commonly used HDPE MBBR fillers can be selected, each of the two commonly used HDPE MBBR fillers continuously operates for 20-40d, and the water outlet difference of the system when different fillers are used is inspected. Compared with different filling forms, the MBBR filling with large specific surface area and complex structure (more pores and grooves) is confirmed, and the number of anoxic regions existing in the filling is more, so that the nitrogen removal effect is better than that of the MBBR filling with small specific surface area and simple structure (less pores and grooves); while the effect of phosphorus removal is the opposite.
Example 2
The utility model also provides a sewage treatment method for the biochemical process coal industry sewage treatment system in embodiment 1 accomplishes sewage treatment, including following step:
step 1: inputting sewage in the sewage station area into the anoxic tank 1 through the water inlet pump 11; step 2: the sewage stays in the anoxic tank 1 for 20-40h, and the effluent enters the aerobic tank 2; and the sludge partially reflows through the sludge discharge pump 32 to supplement the sludge concentration in the tank;
and step 3: the sewage stays in the aerobic tank for 40-70h, the treated sewage flows back to the anoxic tank 1 through the mixed liquid reflux pump 22, the reflux ratio is 100-400%, and the effluent enters the secondary sedimentation tank 3;
and 4, step 4: the surface load of the secondary sedimentation tank 3 adopts 0.5-1.0m 3 /m 2 And h, precipitating the sewage, carrying out outward the sludge at the bottom of the pool through a sludge discharge pump 32 after precipitation, and discharging the discharged water.
It is difficult to see through the above, fix MBBR packing 41 in the form of cage 4 in anoxic pond 1 and aerobic tank 2, can prevent the packing from piling up in the area of water outlet along with rivers, improve biomass and biological species in the pond, and the collision and shearing action of packing in the water, make the air bubble more tiny, increase the oxygen utilization factor in the aerobic tank 2, do benefit to the growth of mud, the concentration of mud increases, the tolerance to water quality and water yield change increases, the impact load capacity is strengthened, have guaranteed the water quality stability of the effluent; meanwhile, the MBBR filler 41 is added to create an environment beneficial to microorganism attachment and survival, the COD content and ammonia nitrogen emission concentration in the sewage are reduced by more than 30% compared with the actual operation, the filler can create an environment beneficial to microorganism attachment and survival, and the total nitrogen and total phosphorus emission concentration is reduced by more than 15% compared with the actual operation.
The foregoing shows and describes the basic principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A biochemical coal chemical sewage treatment system is characterized in that an anoxic tank (1), an aerobic tank (2) and a secondary sedimentation tank (3) are sequentially communicated according to a sewage treatment direction;
a water inlet pump (11) is arranged outside the anoxic tank (1) through a pipeline to input sewage to be treated, and the anoxic tank (1) also partially reflows sludge through a sludge discharge pump (32) to supplement the concentration of the sludge in the tank;
an aeration pipe (21) is arranged at the bottom of the aerobic tank (2), a plurality of groups of aerators (211) are arranged on the aeration pipe (21), and sewage in the tank is returned to the anoxic tank (1) for further treatment through a mixed liquid return pump (22) arranged outside the aerobic tank (2);
a central guide flow cylinder (31) is arranged in the secondary sedimentation tank (3) to precipitate the sewage, the sludge at the bottom of the tank is transported or partially flows back to the anoxic tank (1) through a sludge discharge pump (32) after precipitation, and the precipitated effluent is discharged outside;
and a box cage (4) is hung in the anoxic tank (1) and the aerobic tank (2), and the box cage (4) is filled with an MBBR filler (41).
2. The biochemical coal chemical wastewater treatment system according to claim 1, wherein: an electromagnetic flowmeter (5) and a valve (6) are arranged on an outlet pipeline of the water inlet pump (11), an outlet pipeline of the mixed liquid reflux pump (22) and an outlet pipeline of the sludge discharge pump (32).
3. The biochemical coal chemical wastewater treatment system according to claim 1, wherein: and a stirrer (12) is arranged in the anoxic tank (1) to stir the sewage.
4. The biochemical coal chemical wastewater treatment system according to claim 1, wherein: and an aeration fan (23) is arranged at one end of the aeration pipe (21) extending out of the aerobic tank (2).
5. The biochemical coal chemical wastewater treatment system according to claim 1, wherein: the bottom of the secondary sedimentation tank (3) is funnel-shaped.
6. The biochemical coal chemical wastewater treatment system according to claim 1, wherein: the upper end of the box cage (4) is connected with a steel beam (43) through a plurality of groups of lifting ropes (42), and the steel beam (43) is placed on the tank edges of the anoxic tank (1) and the aerobic tank (2).
7. The biochemical coal chemical wastewater treatment system according to claim 1, wherein: the specific surface area of the MBBR filler (41) is more than 800m 2 /m 3 The number of piled layers is 337500 pieces/m 3 。
8. The biochemical coal chemical wastewater treatment system according to claim 1, wherein: the specific surface area of the MBBR filler (41) is more than 500m 2 /m 3 The number of stacks was 135000/m 3 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202222677162.1U CN218879602U (en) | 2022-10-12 | 2022-10-12 | Biochemical method coal chemical industry sewage treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222677162.1U CN218879602U (en) | 2022-10-12 | 2022-10-12 | Biochemical method coal chemical industry sewage treatment system |
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| CN218879602U true CN218879602U (en) | 2023-04-18 |
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| CN202222677162.1U Active CN218879602U (en) | 2022-10-12 | 2022-10-12 | Biochemical method coal chemical industry sewage treatment system |
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