CN213652202U - Treatment system for coal chemical industry mixed wastewater - Google Patents
Treatment system for coal chemical industry mixed wastewater Download PDFInfo
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- CN213652202U CN213652202U CN202022422401.XU CN202022422401U CN213652202U CN 213652202 U CN213652202 U CN 213652202U CN 202022422401 U CN202022422401 U CN 202022422401U CN 213652202 U CN213652202 U CN 213652202U
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Abstract
The utility model relates to a coal chemical industry mixes processing system of waste water. The system comprises an inclined tube sedimentation tank, a pretreatment system, a UASB reaction system, an A/O system, an activated sludge tank and a sedimentation tank; wherein the inclined tube sedimentation tank, the pretreatment system, the UASB reaction system, the A/O system, the activated sludge tank and the sedimentation tank are connected in sequence; the pretreatment system comprises a homogenizing pool, a pH neutralization pool and a middle water pool; the A/O system comprises a denitrification tank and an aerobic nitrification tank. The treatment system for the coal chemical industry mixed wastewater can carry out uniform mixed treatment on the coal chemical industry wastewater, the organic wastewater and the nitrogen fertilizer wastewater generated in the production process. The problems of unstable final wastewater parameters (namely large fluctuation of ammonia nitrogen and COD), heavy peculiar smell of a wastewater treatment site and the like are solved. The final wastewater can reach a stable target: the ammonia nitrogen is less than or equal to 0.8mg/L, and the COD is less than or equal to 78mg/L, so that the harm to operators and the environment is reduced.
Description
Technical Field
The utility model belongs to the field of water treatment, in particular to a treatment system for coal chemical industry mixed wastewater.
Background
At present, the requirement of the country on environmental protection is increasingly promoted, more and more enterprises begin to increase the strength of self-treatment of wastewater discharged by production, however, the traditional wastewater treatment only can treat a single wastewater type, such as organic wastewater, nitrogen fertilizer wastewater or coal chemical wastewater. This causes related enterprises to have to separately establish wastewater treatment systems for different types of wastewater, which inevitably increases land usage area, labor cost and equipment quantity cost, is not favorable for integration of resources, and brings additional economic expenditure to the enterprises.
Therefore, the utility model discloses the scheme is proposed based on this.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model provides a treatment system for coal chemical industry mixed wastewater. The treatment system for the coal chemical industry mixed wastewater can carry out uniform mixed treatment on the coal chemical industry wastewater, the organic wastewater and the nitrogen fertilizer wastewater generated in the production process. The problems of unstable final wastewater parameters (namely large fluctuation of ammonia nitrogen and COD), heavy peculiar smell of a wastewater treatment site and the like are solved. The final wastewater can reach a stable target: the ammonia nitrogen is less than or equal to 0.8mg/L, and the COD is less than or equal to 78mg/L, so that the harm to operators and the environment is reduced.
The utility model adopts the scheme that a treatment system for mixed wastewater in coal chemical industry is provided, which is characterized by comprising an inclined tube sedimentation tank, a pretreatment system, a UASB reaction system, an A/O system, an activated sludge tank and a sedimentation tank; wherein the inclined tube sedimentation tank, the pretreatment system, the UASB reaction system, the A/O system, the activated sludge tank and the sedimentation tank are connected in sequence; the pretreatment system comprises a homogenizing pool, a pH neutralization pool and a middle water pool; the A/O system comprises a denitrification tank and an aerobic nitrification tank.
In order to facilitate understanding of the technical scheme of the utility model, the working principle of the treatment system of the coal chemical industry mixed wastewater is further explained:
firstly, coal chemical industry wastewater generated in the production process enters the inclined tube sedimentation tank through metering, a flocculating agent (added with polyacrylamide with the addition concentration of 9-12 ppm) is proportioned according to the weight of the entering coal chemical industry wastewater, the flocculating agent and suspended matters, cyanides and sulfides contained in the coal chemical industry wastewater form stable floccules and then automatically sediment by using gravity, and supernatant is introduced into a homogenizing tank in the pretreatment system through a power pump after ammonia nitrogen and COD (chemical oxygen demand) detection.
Secondly, when the supernatant enters a homogenizing tank, the organic wastewater and the nitrogen fertilizer wastewater are introduced together for mixing. The homogenizing tank mainly plays a role in uniformly mixing and also has the functions of regulating water quantity, balancing water quality, cooling and distributing oxygen; then the mixed wastewater enters a pH neutralization tank to adjust and stabilize the pH value, and preparation is made for the next microbial fermentation; and the mixed wastewater continuously enters the intermediate water tank to buffer, store and increase nutrition, and enters the UASB reaction system after the parameters of the mixed wastewater are stable.
And thirdly, the mixed wastewater is introduced into the bottom of the UASB reaction system, the water flow upwards flows through a sludge bed, a sludge suspension layer to a three-phase separator and a settling zone according to a certain flow velocity, the water flow in the UASB reactor is in a plug flow form, the mixed wastewater is fully mixed and contacted with microorganisms in the sludge bed and the sludge suspension layer and is subjected to anaerobic decomposition, a large amount of methane is generated, the methane lifts sludge particles in the rising process, the sludge bed is obviously expanded, the stirring action generated by rising of bubbles becomes more and more severe along with the continuous increase of the gas production rate of the reactor, so that the resistance of the bubbles carried in the sludge is reduced, and the gas is suddenly escaped from the sludge bed to cause the surface of the sludge bed to be in a boiling and fluidized state. Flocculent sludge with poor settling property in the reactor forms a sludge suspension layer on the upper part of the reactor under the stirring action of gas, granular sludge with good settling property is positioned on the lower part of the reactor to form a high-concentration sludge bed, a gas-water-sludge three-phase mixed solution rises into the three-phase separator along with the rising flow of water flow, and the gas is folded to a gas collection chamber after encountering a reflective baffle plate and is effectively separated and discharged; and the sludge and water enter the static settling zone at the upper part, the sludge and the water are separated under the action of gravity, the sludge falls back to a sludge layer, and the supernatant is discharged into subsequent equipment through a water collecting weir.
Then, the supernatant enters a denitrification tank (A tank to generate anaerobic reaction), meanwhile, nitrobacteria are added, most of COD pollutants in the mixed wastewater after anaerobic treatment are removed, but the ammonia nitrogen concentration is not changed, and even the COD pollutants are improved due to the ammoniation of organic nitrogen; then, the mixed wastewater enters an aerobic nitrification tank (O tank), SG1001 efficient nitrifying bacteria are inoculated under the conventional aerobic biochemical condition, the aerobic nitrification denitrification effect is enhanced, the ammonia nitrogen is nitrified into nitrate and nitrite, and the sludge in the sedimentation tank flows back to the nitrification tank. Under the anoxic condition, the denitrifying bacteria utilize the organic matters in the anaerobic effluent as carbon source and the nitro nitrogen in the reflux nitrifying liquid to perform denitrification reaction, thereby further reducing the concentration of the organic matters and the total nitrogen in the wastewater.
Then, the mixed sewage flowing out of the A/O system enters the activated sludge tank, and the sewage and various microorganism populations are continuously mixed and cultured under the condition of oxygenation to form activated sludge. The biological coagulation, adsorption and oxidation of the activated sludge are utilized to decompose and remove organic matters in the sewage.
And finally, separating the sludge from water in a sedimentation tank, wherein the water can be discharged after reaching the standard through detection, and the sludge can be dried and then transported outside.
Preferably, two baffling walls are arranged in the homogenizing tank.
Preferably, an air aeration pipe is arranged in the homogenizing pool.
Preferably, the number of the air aeration pipes is 50-60.
Wherein, set up two sides baffling wall and 50 ~ 60 air aeration pipes in the homogeneity pond, can the intensive mixing waste water to the time of extension waste water dwell. Stirring air is provided by a Roots blower, and the air consumption is 580-620 m3/h。
Preferably, the pH neutralization tank is provided with a pH real-time monitoring device.
Preferably, the pH neutralization tank comprises a pH coarse adjustment tank and a pH fine adjustment tank which are arranged in series.
Preferably, the pH of the waste water in the pH fine adjustment tank is 5-7.
The pH neutralization tank adopts two-stage series connection, namely, in the pH coarse adjustment tank, the pH of the mixed wastewater is detected firstly, a detection signal can be transmitted into a main control DCS system, and the acid and alkali adding amount is controlled by changing the opening degree of a corresponding acid-base valve automatically by a main control or manually by an operator, so that the primary adjustment of the pH of the mixed wastewater is realized; similarly, in the pH fine adjustment tank, after the mixed wastewater with the primarily adjusted pH is detected, the pH value of the mixed wastewater is further accurately adjusted and stabilized at 5-7 under the control of the master control (the specific set value is related to the quality of inlet water, and the adjustment is mainly controlled according to the pH value of the effluent of the UASB).
Preferably, the A/O system is provided with a pH real-time monitoring device and a dissolved oxygen real-time monitoring device.
Wherein, the pH value of the O pool can be reduced in the nitration process, the pH value and the dissolved oxygen of the O pool are monitored by a pH real-time monitoring device and a dissolved oxygen real-time monitoring device, the pH value is controlled to be about 7.5-8.5, and the dissolved oxygen is controlled to be about 2-6 mg/L, so that the O pool is in a normal range.
Preferably, the treatment system for the coal chemical industry mixed wastewater further comprises a sludge concentration tank; the sludge concentration tank is respectively connected with the inclined tube sedimentation tank, the pretreatment system, the UASB reaction system, the A/O system, the activated sludge tank and the sedimentation tank.
Preferably, the treatment system for the coal chemical industry mixed wastewater further comprises a sludge dewatering machine; the sludge dewatering machine is connected with the sludge concentration tank.
Wherein, in the reaction of each stage, corresponding sediment or sediment is generated, and the efficiency of each stage of reaction is improved by carrying out centralized and unified collection and treatment on the sediment or sediment, so the sludge concentration tank is arranged. In pipe chute sedimentation tank, pretreatment systems, UASB reaction system, AO system, activated sludge pond and sedimentation tank, all can produce corresponding silt and deposit, silt deposit through the mud pump unified collect in the mud thickening jar carries out gravity concentration, can isolate most space water in the mud. Discharging the light phase with high void water content to a filtrate tank through a clear liquid discharge valve of the sludge concentration tank; heavy-phase sludge with the water content of 94-98% is cut into long fibers by a sludge cutting machine, the long fibers are sent out by a sludge feeding pump, and are mixed with 0.1% PAM to generate alum flocs which enter a sludge dewatering machine, and a centrifugal machine can separate adsorption water and capillary water in the sludge, wherein the adsorption water and the capillary water account for 15-25% of the total water content in the sludge.
The utility model has the advantages that:
coal chemical industry mixed wastewater's processing system, can mix coal chemical industry waste water, organic waste water and nitrogenous fertilizer waste water and unify the processing, solved final waste water parameter unstability (ammonia nitrogen and COD are undulant big promptly), the heavy scheduling problem of the on-the-spot special flavor of waste water treatment. The final wastewater can reach a stable target: the ammonia nitrogen is less than or equal to 0.8mg/L, and the COD is less than or equal to 78mg/L, so that the harm to operators and the environment is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a process flow diagram of a treatment system for coal chemical industry mixed wastewater.
Figure 2 is the pretreatment system of the present invention.
Fig. 3 is the a/O system of the present invention.
Fig. 4 is the system for treating mixed wastewater in coal chemical industry, during the period from 10 months to 1 month in 2019 in 2018, treats the detected value of the COD content in the obtained mixed wastewater.
FIG. 5 is a view showing the detection value of the ammonia nitrogen content in the mixed wastewater obtained by the treatment system of the mixed wastewater in the coal chemical industry during the 10 th month to the 1 st month in 2018.
Reference numbers in the figures:
1-an inclined tube sedimentation tank; 2-a pretreatment system; 21-homogenizing pool; 22-pH neutralization tank; 23-an intermediate pool; 3-UASB reaction system; 4-A/O system; 41-a denitrification tank; 42-an aerobic nitrification tank; 5-an activated sludge tank; 6-a sedimentation tank; 7-sludge concentration tank; 8-sludge dewatering machine.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Examples
The embodiment provides a treatment system of coal chemical industry mixed wastewater, and with reference to fig. 1, the treatment system comprises an inclined tube sedimentation tank 1, a pretreatment system 2, a UASB reaction system 3, an A/O system 4, an activated sludge tank 5 and a sedimentation tank 6;
wherein the inclined tube sedimentation tank 1, the pretreatment system 2, the UASB reaction system 3, the A/O system 4, the activated sludge tank 5 and the sedimentation tank 6 are connected in sequence;
referring to fig. 2, the pretreatment system 2 includes a homogenizing tank 21, a pH neutralizing tank 22, and an intermediate water tank 23;
referring to fig. 3, the a/O system 4 includes a denitrification tank 41 and an aerobic nitrification tank 42.
As an alternative embodiment, two baffle walls are arranged in the homogenizing tank 21.
As an alternative embodiment, an air aeration pipe is arranged in the homogenizing tank 21.
As an optional embodiment, the number of the air aeration pipes is 50-60.
As an alternative embodiment, the pH neutralization tank 22 is provided with a pH real-time monitoring device.
Referring to fig. 4, as an alternative embodiment, the pH neutralization tank 22 includes a pH rough adjustment tank and a pH fine adjustment tank which are arranged in series.
As an optional implementation mode, the pH of the waste water in the pH fine adjustment tank is 5-7.
As an alternative embodiment, the a/O system 4 is provided with a pH real-time monitoring device and a dissolved oxygen real-time monitoring device.
Referring to fig. 1, as an alternative embodiment, the treatment system for the coal chemical industry mixed wastewater further includes a sludge concentration tank 7; the sludge concentration tank 7 is respectively connected with the inclined tube sedimentation tank 1, the pretreatment system 2, the UASB reaction system 3, the A/O system 4, the activated sludge tank 5 and the sedimentation tank 6.
Referring to fig. 1, as an alternative embodiment, the treatment system for the coal chemical industry mixed wastewater further includes a sludge dewatering machine 8; the sludge dewatering machine 8 is connected with the sludge concentration tank 7.
For showing the treatment system of coal chemical industry mixed waste water carries out the testing to the treatment effect of mixing waste water, and the test result is shown as table 1.
The detection method comprises the following steps: taking mixed wastewater at an inlet for detection, and then detecting the wastewater at a water outlet after timing sampling treatment.
TABLE 1 Water quality test results (mg/L)
From table 1, it can be seen: the utility model discloses after coal chemical industry mixed waste water's processing system steady operation 96h, its ammonia nitrogen of waste water and COD index of delivery port department all satisfy the standard.
And as can be seen from the attached figure 4, the COD of the treated water outlet wastewater is always maintained at 20-62 mg/L from 10 months in 2018 to 1 month in 2019, so that the treated water outlet wastewater reaches a good treatment standard.
As can be seen from the attached figure 5, in the period from 10 months to 1 month in 2019 in 2018, the ammonia nitrogen of the treated water outlet wastewater is always maintained at 0.05-0.8 mg/L (only one group of data has higher fluctuation, and reaches 1.4mg/L), and the good treatment standard is also achieved.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A treatment system for mixed wastewater in coal chemical industry is characterized by comprising an inclined tube sedimentation tank (1), a pretreatment system (2), a UASB reaction system (3), an A/O system (4), an activated sludge tank (5) and a sedimentation tank (6);
wherein the inclined tube sedimentation tank (1), the pretreatment system (2), the UASB reaction system (3), the A/O system (4), the activated sludge tank (5) and the sedimentation tank (6) are connected in sequence;
the pretreatment system (2) comprises a homogenizing pool (21), a pH neutralization pool (22) and an intermediate water pool (23);
the A/O system (4) comprises a denitrification tank (41) and an aerobic nitrification tank (42).
2. The system for treating the mixed wastewater in the coal chemical industry as defined in claim 1, wherein two baffle walls are disposed in the homogenizing tank (21).
3. The system for treating the coal chemical industry mixed wastewater as defined in claim 1, wherein an air aeration pipe is provided in the homogenizing tank (21).
4. The system for treating the coal chemical industry mixed wastewater as defined in claim 3, wherein the number of the air aeration pipes is 50-60.
5. The system for treating the coal chemical industry mixed wastewater as defined in claim 1, wherein the pH neutralization tank (22) is provided with a pH real-time monitoring device.
6. The system for treating the coal chemical industry mixed wastewater as defined in claim 5, wherein the pH neutralization tank (22) comprises a pH rough adjustment tank and a pH fine adjustment tank which are arranged in series.
7. The system for treating the coal chemical industry mixed wastewater as defined in claim 6, wherein the pH of the wastewater inside the pH fine adjustment tank is 5-7.
8. The treatment system for the mixed wastewater in the coal chemical industry according to claim 1, wherein the A/O system (4) is provided with a pH real-time monitoring device and a dissolved oxygen real-time monitoring device.
9. The system for treating the mixed wastewater in the coal chemical industry according to claim 1, further comprising a sludge thickening tank (7); the sludge concentration tank (7) is respectively connected with the inclined tube sedimentation tank (1), the pretreatment system (2), the UASB reaction system (3), the A/O system (4), the activated sludge tank (5) and the sedimentation tank (6).
10. The system for treating the mixed wastewater in the coal chemical industry according to claim 9, further comprising a sludge dewatering machine (8); the sludge dewatering machine (8) is connected with the sludge concentration tank (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022422401.XU CN213652202U (en) | 2020-10-26 | 2020-10-26 | Treatment system for coal chemical industry mixed wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022422401.XU CN213652202U (en) | 2020-10-26 | 2020-10-26 | Treatment system for coal chemical industry mixed wastewater |
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| CN213652202U true CN213652202U (en) | 2021-07-09 |
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| CN202022422401.XU Active CN213652202U (en) | 2020-10-26 | 2020-10-26 | Treatment system for coal chemical industry mixed wastewater |
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