CN216863941U - Waste water treatment device - Google Patents
Waste water treatment device Download PDFInfo
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- CN216863941U CN216863941U CN202220752937.4U CN202220752937U CN216863941U CN 216863941 U CN216863941 U CN 216863941U CN 202220752937 U CN202220752937 U CN 202220752937U CN 216863941 U CN216863941 U CN 216863941U
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Abstract
The utility model relates to a wastewater treatment device, which mainly solves the problems of low wastewater temperature, small sludge activity and reduced wastewater treatment capacity of a wastewater device in low-temperature environments in polyether polyol production in the prior art. The utility model adopts a technical scheme that the waste water treatment device comprises a production device (1), a waste water tank (2), an adjusting tank (4), a biochemical tank (5), a secondary sedimentation tank (6), a discharge tank (7), a residual sludge tank (8) and a condensed water tank (3), wherein a coil pipe (3-1) is arranged in the waste water tank (2), the top of the condensed water tank (3) is provided with an air outlet communicated with the coil pipe (3-1), and the coil pipe (3-1) is provided with an exhaust hole, so that condensed water steam is sprayed out from the coil pipe (3-1) to heat waste water in the waste water tank (2).
Description
Technical Field
The utility model relates to the field of polyether polyol, in particular to a wastewater treatment device.
Background
A large amount of industrial sewage can be generated in the industrial production of polyether polyol, the conventional process adopted by a sewage treatment device comprises an aerobic process, and the basic principle of sewage treatment by adopting the aerobic process is as follows: under aerobic conditions, microorganisms in the sludge metabolize to decompose organic matters in the sewage into carbon dioxide and water so as to achieve the purpose of degrading the organic matters, and meanwhile, the microorganisms in the sludge proliferate themselves, so that high-concentration activated sludge in a sewage treatment system is ensured to further degrade the organic matters; but the sewage treatment effect is greatly influenced by low-temperature environment, the activity of the activated sludge is gradually reduced and the precipitability is poor along with the reduction of the water temperature, the removal, nitrification and denitrification of organic matters are greatly impacted, the proper temperature of the microorganisms is 20-35 ℃, when the external temperature is lower than 10 ℃, part of the microorganisms are in a dormant state, the activity of the sludge is greatly reduced, when the temperature is lower than 4 ℃, most of the microorganisms enter a dormant or even dead state, and the nitrification of the sewage treatment system is almost stopped; in winter, polyether production wastewater is recycled to a production device and then discharged into a sewage device, the whole pipeline is long, the temperature is reduced quickly, the water temperature is about 10 ℃ when the polyether production wastewater is discharged into a regulating tank of the sewage device, and if the polyether production wastewater directly enters a biochemical tank, the polyether production wastewater can generate adverse effects on the growth of microorganisms in the tank and influence the treatment capacity of the sewage device; therefore, it is very important to preheat the sewage before the sewage enters the biochemical tank, and the conventional waste water heat exchange adopts steam to heat the waste water coil pipe, so that the pipe wall of the waste water coil pipe is scaled, the heat exchange effect is poor, the temperature rise is not obvious, and the steam is wasted.
Chinese patent CN106630422A discloses a biological treatment device for polyether polyol production wastewater, which mainly comprises a regulating tank, a CBR tank, an activated sludge tank, a secondary sedimentation tank, an ozone oxidation tank, a residual sludge tank, a sludge dewatering machine and a water collecting tank; however, the temperature of the wastewater entering the regulating tank in the device is greatly influenced by the air temperature, the temperature of the wastewater is low in winter, the growth speed of microorganisms is slow, and the sludge activity is low.
Chinese patent CN113896379A discloses an integrated low-temperature-resistant sewage treatment system, which comprises a solar power generation system, a sewage heating system and a sewage treatment system; the sewage heating system consists of a wall-mounted furnace, a heat exchange water tank and a heating circulating pump; the system can increase the temperature of the biochemical system in the winter in cold areas, but the investment cost is higher.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems that the wastewater temperature is low, the sludge activity is small and the treatment capacity of a wastewater device is reduced in a low-temperature environment in polyether polyol production in the prior art, and provides a wastewater treatment device which has the advantages of stable wastewater temperature, large sludge activity and high treatment capacity of the wastewater device.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: a wastewater treatment device comprises a production device 1, a wastewater tank 2, a regulating tank 4, a biochemical tank 5, a secondary sedimentation tank 6, a discharge tank 7 and a residual sludge tank 8, wherein the wastewater treatment device also comprises a water condensation tank 3, a coil 3-1 is arranged in the wastewater tank 2, the top of the water condensation tank 3 is provided with an air outlet which is communicated with the coil 3-1, and the coil 3-1 is provided with an exhaust hole so that condensed water steam is sprayed out from the coil 3-1 to heat wastewater in the wastewater tank 2; the production device 1, the wastewater tank 2, the regulating tank 4, the biochemical tank 5, the secondary sedimentation tank 6 and the discharge tank 7 are all provided with a water inlet and a water outlet; the secondary sedimentation tank 6 is also provided with a sludge outlet; the water outlet of the production device 1 is connected with the water inlet of the wastewater tank 2, the water outlet of the wastewater tank 2 is connected with the water inlet of the regulating tank 4, the water outlet of the regulating tank 4 is connected with the water inlet of the biochemical tank 5, the water outlet of the biochemical tank 5 is connected with the water inlet of the secondary sedimentation tank 6, the water outlet of the secondary sedimentation tank 6 is connected with the water inlet of the discharge tank 7, the water outlet of the discharge tank 7 is connected with the production device 1 through a reuse water pipeline 7-1, and the sludge outlet of the secondary sedimentation tank 6 is connected with the residual sludge tank 8.
Furthermore, the biochemical tank 5 is also provided with a sludge inlet, and the sludge from the secondary sedimentation tank 6 partially flows back to the biochemical tank 5 through a sludge return pipeline 6-1.
Further, the gas outlet of the condensate tank 3 is provided with a steam valve, the waste water tank 2 is internally provided with a temperature detector, and the steam valve and the temperature detector are in linkage control.
According to the wastewater treatment device provided by the utility model, the waste heat of steam in the produced condensate tank is utilized to carry out heat exchange on the wastewater tank, so that the water temperature of the regulating tank is kept at 25-30 ℃, the temperature of the biochemical tank can be controlled at a proper temperature, the reduction of sludge activity in a low-temperature environment is avoided, the stable maintenance of the wastewater treatment capacity of the wastewater treatment device is ensured, and the COD value in the treated wastewater is reduced to 100-150 mg/L; meanwhile, energy waste caused by direct evacuation of steam in the condensate tank is avoided, the heat utilization rate is improved, and a better technical effect is achieved.
Drawings
FIG. 1 is a schematic view showing the structure of a wastewater treatment apparatus according to the present invention.
In the attached figure 1, 1 is a production device, 2 is a wastewater tank, 3 is a condensate tank, 3-1 is a coil pipe, 4 is a regulating tank, 5 is a biochemical tank, 6 is a secondary sedimentation tank, 6-1 is a sludge return pipeline, 7 is a discharge tank, 7-1 is a reuse water pipeline, and 8 is a residual sludge tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
[ example 1 ]
A wastewater treatment device comprises a production device 1, a wastewater tank 2, a regulating tank 4, a biochemical tank 5, a secondary sedimentation tank 6, a discharge tank 7 and a residual sludge tank 8, wherein the wastewater treatment device also comprises a water condensation tank 3, a coil 3-1 is arranged in the wastewater tank 2, the top of the water condensation tank 3 is provided with an air outlet which is communicated with the coil 3-1, and the coil 3-1 is provided with an exhaust hole so that condensed water steam is sprayed out from the coil 3-1 to heat wastewater in the wastewater tank 2;
the production device 1, the wastewater tank 2, the regulating tank 4, the biochemical tank 5, the secondary sedimentation tank 6 and the discharge tank 7 are all provided with a water inlet and a water outlet; the secondary sedimentation tank 6 is also provided with a sludge outlet; the water outlet of the production device 1 is connected with the water inlet of the wastewater tank 2, the water outlet of the wastewater tank 2 is connected with the water inlet of the regulating tank 4, the water outlet of the regulating tank 4 is connected with the water inlet of the biochemical tank 5, the water outlet of the biochemical tank 5 is connected with the water inlet of the secondary sedimentation tank 6, the water outlet of the secondary sedimentation tank 6 is connected with the water inlet of the discharge tank 7, the water outlet of the discharge tank 7 is connected with the production device 1 through a reuse water pipeline 7-1, and the sludge outlet of the secondary sedimentation tank 6 is connected with the residual sludge tank 8; the biochemical tank 5 is also provided with a sludge inlet, and part of sludge from the secondary sedimentation tank 6 flows back to the biochemical tank 5 through a sludge return pipeline 6-1; a steam valve is arranged at the gas outlet of the condensate tank 3, a temperature detector is arranged in the wastewater tank 2, and the steam valve and the temperature detector are controlled in a linkage manner.
In winter, the external environment temperature is about 8 ℃, wastewater from a production device enters a wastewater pool, the temperature of the wastewater pool is set to be 28 ℃, a steam valve is opened to heat the wastewater pool by using condensed steam, and the steam valve is closed when the temperature reaches a set value; the method comprises the following steps that waste water with the COD concentration of 2500mg/L in a waste water tank enters an adjusting tank, sodium hydroxide is added into the adjusting tank to enable the pH value to reach 8-9, the waste water is adjusted by the adjusting tank and then enters a biochemical tank for treatment, treated sludge-water mixed liquid enters a secondary sedimentation tank, partial sludge flows back to the biochemical tank after sludge-water separation, the rest sludge enters a rest sludge tank, and supernatant enters a discharge tank and is recycled to a production device as required; wherein, the COD concentration of the wastewater entering the biochemical tank is 2000mg/L, and the COD concentration in the wastewater treated by the biochemical tank is 100mg/L, so that the biochemical tank of the device is not influenced by low-temperature environment, the sludge activity is good, and the wastewater treatment effect is good.
The wastewater treatment device provided by the utility model has the advantages of stable wastewater temperature, no influence of external low-temperature environment, large sludge activity of a biochemical tank and strong wastewater treatment capacity by heating the wastewater tank by utilizing the condensed water vapor, obtains good technical effect, and can be used for industrial application of polyether polyol wastewater treatment.
Claims (3)
1. A wastewater treatment device comprises a production device (1), a wastewater tank (2), an adjusting tank (4), a biochemical tank (5), a secondary sedimentation tank (6), a discharge tank (7) and a residual sludge tank (8), and is characterized by further comprising a condensation water tank (3), wherein a coil (3-1) is arranged in the wastewater tank (2), a gas outlet is formed in the top of the condensation water tank (3) and communicated with the coil (3-1), and a vent hole is formed in the coil (3-1) so that condensation water vapor is sprayed out of the coil (3-1) to heat wastewater in the wastewater tank (2); the production device (1), the wastewater tank (2), the regulating tank (4), the biochemical tank (5), the secondary sedimentation tank (6) and the discharge tank (7) are all provided with a water inlet and a water outlet; the secondary sedimentation tank (6) is also provided with a sludge outlet; the water outlet of the production device (1) is connected with the water inlet of the wastewater tank (2), the water outlet of the wastewater tank (2) is connected with the water inlet of the regulating tank (4), the water outlet of the regulating tank (4) is connected with the water inlet of the biochemical tank (5), the water outlet of the biochemical tank (5) is connected with the water inlet of the secondary sedimentation tank (6), the water outlet of the secondary sedimentation tank (6) is connected with the water inlet of the discharge tank (7), the water outlet of the discharge tank (7) is connected with the production device (1) through a reuse water pipeline (7-1), and the sludge outlet of the secondary sedimentation tank (6) is connected with the residual sludge tank (8).
2. The wastewater treatment plant according to claim 1, characterized in that the biochemical tank (5) is further provided with a sludge inlet, and the sludge from the secondary sedimentation tank (6) is partially returned to the biochemical tank (5) through a sludge return line (6-1).
3. The wastewater treatment device according to claim 1, characterized in that a steam valve is arranged at the gas outlet of the condensate tank (3), a temperature detector is arranged in the wastewater tank (2), and the steam valve and the temperature detector are in linkage control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220752937.4U CN216863941U (en) | 2022-04-02 | 2022-04-02 | Waste water treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220752937.4U CN216863941U (en) | 2022-04-02 | 2022-04-02 | Waste water treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216863941U true CN216863941U (en) | 2022-07-01 |
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ID=82124467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220752937.4U Active CN216863941U (en) | 2022-04-02 | 2022-04-02 | Waste water treatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216863941U (en) |
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2022
- 2022-04-02 CN CN202220752937.4U patent/CN216863941U/en active Active
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