CN210393994U - Inferior coal gasification wastewater pretreatment device - Google Patents
Inferior coal gasification wastewater pretreatment device Download PDFInfo
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- CN210393994U CN210393994U CN201920925611.5U CN201920925611U CN210393994U CN 210393994 U CN210393994 U CN 210393994U CN 201920925611 U CN201920925611 U CN 201920925611U CN 210393994 U CN210393994 U CN 210393994U
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Abstract
The utility model provides an inferior coal gasification wastewater pretreatment of water device belongs to the industrial wastewater treatment field, solves the problem that present processing result is difficult to reach the quality of water requirement of advancing biochemical system. The water outlet of the primary sedimentation oil separation tank is connected with the water inlet of a coagulation reaction tank, the oil stain tank is communicated with the primary sedimentation oil separation tank, the water outlet of the coagulation reaction tank is connected with a first water inlet of a coagulation air flotation tank, the water outlet of the coagulation air flotation tank is connected with the water inlet of an air flotation water outlet tank, the first water outlet of the air flotation water outlet tank is connected with the water inlet of a phenol-ammonia sewage regulating tank, the water outlet of the phenol-ammonia sewage regulating tank is connected with a biochemical system, the water inlet of an air flotation jet pump is connected with a second water outlet of the air flotation water outlet tank, the water outlet of the air flotation jet pump is connected with the water inlet of an air flotation jet ejector, the outlet of the air flotation jet ejector is connected with a second water inlet of the coagulation air flotation tank, the sludge outlet of the coagulation air flotation tank is connected with.
Description
Technical Field
The utility model belongs to the industrial wastewater treatment field especially relates to an inferior coal gasification wastewater pretreatment of water device.
Background
In recent years, lurgi pressure coal gasification technology is widely applied to clean utilization processes of coal such as domestic coal-to-liquid, coal-to-gas, coal-to-dimethyl ether and coal-to-ethylene glycol, but a large amount of wastewater is generated in the coal chemical gasification process, contains high-concentration pollutants, has complex water quality components, mainly takes phenolic compounds as main components, contains a large amount of long-chain alkanes, aromatics, heterocycles and the like, also contains toxic and harmful substances such as ammonia nitrogen, cyanogen and the like, has poor water biodegradability and strong microbial inhibition, and is typical high-concentration industrial wastewater which is difficult to biodegrade. Therefore, coal gasification wastewater treatment has long been a big problem in the field of domestic and foreign wastewater treatment.
The waste water generated by washing the raw gas is used for washing dust and various volatile matters contained in the raw gas, and is cooled and discharged after being circularly washed at high temperature, so that the components in the waste water are very complex and wide, most of solid substances such as calcium and magnesium ions in the components are in a saturated state, and the components of the waste water change along with the change of raw material coal components, gasification conditions and operating conditions, the lurgi gasification process technology is mature and widely applied, but the raw gas is cooled through the extraction process of the raw material coal, so that the components of the generated waste water are complex and changeable, and the main appearance characteristics are as follows: dark brown, viscous, foamy. The pH value is more than 7 but unstable, the maximum pH value can reach more than 10, the odor of phenol ammonia is strong, the COD value is about 5000mg/L, the ammonia nitrogen concentration is 2500-7000 mg/L, and the oil content is about 800 mg/L. Therefore, the inferior coal gasification wastewater is usually treated by deacidification degreasing, gas stripping ammonia distillation and phenol removal technologies, the light and heavy oil, suspended matters and other pollutants in the inferior coal gasification wastewater treated by a phenol-ammonia recovery system are still high, the inferior coal gasification wastewater enters a biochemical system, the organic load of the system is increased, grease wrapping is caused to the organisms to lose the activity of the organisms, a large amount of bubbles are generated on the surface of a pool, and the serious influence is caused to the biochemical system. Therefore, a pretreatment device is required to be arranged before the inferior coal gasification wastewater enters a biochemical system so as to remove most of pollutants such as light and heavy oil, suspended matters and the like.
At present, the inferior coal gasification wastewater is usually pretreated by a physical or pure chemical method, and the treatment result of the pretreatment method cannot meet the water quality requirement of a biochemical system.
Disclosure of Invention
In order to solve the technical problem that the treatment result is difficult to reach the water quality requirement of the biochemical system in the prior mode of carrying out pretreatment on inferior coal gasification wastewater, the utility model provides an inferior coal gasification wastewater pretreatment device.
In order to solve the technical problem, the utility model discloses a technical scheme is:
an inferior coal gasification wastewater pretreatment device comprises an oil stain tank, a primary sedimentation oil separation tank, a coagulation reaction tank, a coagulation air flotation tank, an air flotation water outlet tank, a phenol ammonia wastewater adjusting tank, an air flotation jet pump, an air flotation oil-containing sludge tank, a sludge discharge screw pump, an air flotation tank water outlet cover plate valve, an air flotation slag scraping machine, an air flotation jet device and a centrifugal dehydrator; the water inlet of the primary sedimentation oil separation tank is connected with a wastewater source, the water outlet of the primary sedimentation oil separation tank is connected with the water inlet of a coagulation reaction tank, the oil stain tank is communicated with the primary sedimentation oil separation tank, the coagulation reaction tank is connected with a flocculating agent dosing system and a degreasing agent dosing system, the water outlet of the coagulation reaction tank is connected with a first water inlet of a coagulation air flotation tank, a jet flow air dissolving system is arranged in the coagulation air flotation tank, the water outlet of the coagulation air flotation tank is connected with the water inlet of an air flotation water outlet tank through an air flotation tank water outlet cover plate valve, a first water outlet of the air flotation water outlet tank is connected with the water inlet of a phenol ammonia sewage adjusting tank, the water outlet of the phenol ammonia sewage adjusting tank is connected with a biochemical system, the water inlet of an air flotation jet pump is connected with a second water outlet of the air flotation water outlet tank, the water outlet of the air flotation jet pump is connected with the water inlet of an air ejector, the air flotation residue scraping machine is arranged at the top of the air flotation tank, the sludge outlet of the air flotation tank is connected with the sludge inlet of the air flotation oily sludge tank, the sludge outlet of the air flotation oily sludge tank is connected with the sludge inlet of the sludge discharge screw pump, the sludge outlet of the sludge discharge screw pump is connected with the sludge inlet of the centrifugal dehydrator, the centrifugal dehydrator is also connected with a flocculating agent dosing system, and the water outlet of the centrifugal dehydrator is connected with the water inlet of the primary sedimentation oil separation tank.
Optionally, the pretreatment device for inferior coal gasification wastewater further comprises an air flotation coagulation stirrer, and the air flotation coagulation stirrer is arranged inside the coagulation reaction tank.
Optionally, the inlet of the primary settling oil separation tank is provided with a low-pressure steam heating system.
Optionally, the first water outlet of the air floatation water outlet tank is connected with the water inlet of the phenol ammonia wastewater adjusting tank through a U-shaped pipeline.
The utility model has the advantages that:
through setting up structures such as oil interceptor, coagulation reaction tank, coagulation air supporting pond and the oily sludge impoundment of atmospheric pressure, an inferior coal gasification wastewater pretreatment device that collection oil interceptor, coagulation reaction, coagulation air supporting and sludge treatment are as an organic whole is provided, handle inferior coal gasification waste water through the device, can all detach most suspended solid and oils in the inferior coal gasification waste water, be favorable to follow-up biochemical system's operation. The utility model has the advantages of saving cost, large wastewater treatment capacity, compact device layout, small occupied area, optimized flow of combined process, easy operation and control, and the like.
Drawings
Fig. 1 is a schematic view of the structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the inferior coal gasification wastewater pretreatment device in this embodiment includes an oil stain tank 1, a primary sedimentation oil separation tank 2, a coagulation reaction tank 3, a coagulation air flotation tank 4, an air flotation water outlet tank 5, a phenol ammonia wastewater adjusting tank 6, an air flotation jet pump 7, an air flotation oil-containing sludge tank 8, a sludge discharge screw pump 9, an air flotation tank water outlet cover plate valve 10, an air flotation scraper 11, an air flotation jet device 12 and a centrifugal dehydrator 13; the water inlet of the primary sedimentation oil separation tank 2 is connected with a wastewater source, the water outlet of the primary sedimentation oil separation tank 2 is connected with the water inlet of a coagulation reaction tank 3, an oil stain tank 1 is communicated with the primary sedimentation oil separation tank 2, the coagulation reaction tank 3 is connected with a flocculating agent feeding system and a degreasing agent feeding system, the water outlet of the coagulation reaction tank 3 is connected with a first water inlet of a coagulation air flotation tank 4, a jet flow dissolved air system is arranged in the coagulation air flotation tank 4, the water outlet of the coagulation air flotation tank 4 is connected with the water inlet of an air flotation water outlet tank 5 through an air flotation tank water outlet cover plate valve 10, a first water outlet of the air flotation water outlet tank 5 is connected with the water inlet of a phenol ammonia sewage adjusting tank 6, the water outlet of the phenol ammonia sewage adjusting tank 6 is connected with a biochemical system, the water inlet of an air flotation jet pump 7 is connected with a second water outlet of the air flotation water outlet, the air inlet and the nitrogen gas source of air supporting ejector 12 are connected, the export of air supporting ejector 12 is connected with the second water inlet of coagulating air supporting pond 4, sediment machine 11 is installed in coagulating air supporting pond 4 top is scraped in the air supporting, the mud export of coagulating air supporting pond 4 and the mud access connection of air supporting oily sludge impoundment 8, the mud export of air supporting oily sludge impoundment 8 and the mud access connection of mud discharge screw pump 9, the mud export of mud discharge screw pump 9 and the mud access connection of centrifugal dehydrator 13, centrifugal dehydrator 13 still adds medicine system connection with the flocculating agent, the delivery port of centrifugal dehydrator 13 is connected with the water inlet of just sinking oil interceptor 2.
Optionally, the inferior coal gasification wastewater pretreatment device further comprises an air flotation coagulation stirrer 14, and the air flotation coagulation stirrer 14 is arranged inside the coagulation reaction tank 3, so that the effluent of the primary sedimentation oil separation tank 2 is uniformly mixed with the degreasing agent and the flocculating agent.
Optionally, the entry of the primary oil separation tank 2 is provided with a low-pressure steam heating system, so that a plurality of strands of wastewater are uniformly mixed to improve the water temperature, and the grease in the wastewater can be removed easily.
Optionally, a first water outlet of the air floatation water outlet tank 5 is connected with a water inlet of the phenol ammonia wastewater regulating tank 6 through a U-shaped pipeline.
Alternatively, the air flotation slag scraper 11 is operated intermittently or continuously.
Optionally, the wastewater entering the primary oil separation tank 2 automatically flows into a subsequent phenol ammonia wastewater adjusting tank through a liquid level difference, so that a wastewater lifting device can be reduced, and the cost is saved.
The utility model discloses when using, realize through following flow:
1. inferior coal gasification wastewater from a wastewater source enters a primary settling oil separation tank 2 through a pipeline, the primary settling oil separation tank 2 is subjected to gravity oil-out separation treatment, the wastewater subjected to gravity oil-removing separation treatment enters a coagulation reaction tank 3, heavy oil obtained by the gravity oil-removing separation treatment is discharged into an oil stain tank 1 through a pipeline at the bottom of the primary settling oil separation tank 2, and light oil enters an oil overflow tank at the upper part of the primary settling oil separation tank 2 and then is discharged into the oil stain tank 1 through a pipeline. Experiments prove that after the wastewater with COD less than or equal to 4500mg/L and oil less than or equal to 300mg/L is treated by the primary sedimentation oil separation tank 2, the removal rate of COD is more than or equal to 10 percent and the removal rate of oil is more than or equal to 85 percent.
2. The wastewater from which part of the heavy oil and light oil is removed is fully contacted with the flocculant and the degreaser which are respectively added by the flocculant dosing system and the degreaser dosing system in the coagulation reaction tank 3 for adsorption and coagulation, after the wastewater from which part of the heavy oil and light oil is removed is subjected to coagulation reaction, fine particle suspended matters and grease in the wastewater grow up through the action of the flocculant, and the wastewater enters the coagulation air flotation tank 4. The air flotation coagulation stirrer 14 arranged at the top of the coagulation reaction tank 3 is used for uniformly mixing the effluent of the primary sedimentation oil separation tank 2 with the degreasing agent and the flocculating agent so as to accelerate the growth of suspended matters and grease flocs in the wastewater.
3. The jet dissolved air system (nitrogen) in the coagulation air flotation tank 4 removes most of oil and suspended matters from the wastewater treated by the coagulation reaction tank 3 through jet dissolved air (nitrogen) air flotation, the wastewater treated by the coagulation air flotation tank 4 enters an air flotation water outlet tank 5 through the adjustment of an air flotation tank water outlet cover plate valve 10, and the coal gasification wastewater and the rest of wastewater are mixed and sent to a biochemical system through a phenol-ammonia wastewater adjusting tank 6. The oil removing agent is added into the coagulation reaction tank 3, and the oil content in the low-quality coal wastewater can be reduced to be below 45mg/L after passing through the coagulation air flotation tank 4.
4. The air-flotation jet pump 7 sends part of the wastewater from the air-flotation water outlet tank 5 to the air-flotation jet device 12, and the air-flotation jet device 12 sends nitrogen and the wastewater to the front end of the coagulation air-flotation tank 4 together, so that a large amount of micro nitrogen bubbles and water are mixed and dissolved in the coagulation air-flotation tank 4 to be contacted with the wastewater from the coagulation reaction tank 3, and the dissolved air (nitrogen) air flotation can avoid generating a large amount of foam and generating more cyclopentenone and other heterocyclic compounds.
5. The floating oil sludge on the upper part of the coagulation air flotation tank 4 is scraped into an air-floating oil-containing sludge tank 8 under the action of an air-floating residue scraper 11, the oil-containing sludge is sent into the front end of a centrifugal dehydrator 13 by a sludge discharge screw pump 9 to be mixed with an organic flocculant, the sludge with most of water removed by the centrifugal action is conveyed to a sludge treatment system, and the effluent of the centrifugal dehydrator 13 enters a primary sedimentation oil separation tank 2. The oily sludge tank 8 is used for storing scum of the coagulation air floatation tank 4 scraped by the air floatation scum scraping machine 11. The sludge discharge screw pump 9 is used for conveying sludge water in the air-float oil-containing sludge tank 8 into the centrifugal dehydrator 13 for centrifugal desliming.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (4)
1. An inferior coal gasification wastewater pretreatment device is characterized by comprising an oil stain tank (1), a primary sedimentation oil separation tank (2), a coagulation reaction tank (3), a coagulation air flotation tank (4), an air flotation water outlet tank (5), a phenol ammonia wastewater adjusting tank (6), an air flotation jet pump (7), an air flotation oil-containing sludge tank (8), a sludge discharge screw pump (9), an air flotation tank water outlet cover plate valve (10), an air flotation slag scraping machine (11), an air flotation jet device (12) and a centrifugal dehydrator (13);
the water inlet of the primary sedimentation oil separation tank (2) is connected with a wastewater source, the water outlet of the primary sedimentation oil separation tank (2) is connected with the water inlet of a coagulation reaction tank (3), the oil stain tank (1) is communicated with the primary sedimentation oil separation tank (2), the coagulation reaction tank (3) is connected with a flocculant dosing system and a degreaser dosing system, the water outlet of the coagulation reaction tank (3) is connected with the first water inlet of a coagulation air flotation tank (4), a jet flow dissolved air system is arranged in the coagulation air flotation tank (4), the water outlet of the coagulation air flotation tank (4) is connected with the water inlet of an air flotation water outlet tank (5) through an air flotation tank water outlet cover plate valve (10), the first water outlet of the air flotation water outlet tank (5) is connected with the water inlet of a phenol ammonia wastewater adjusting tank (6), the water outlet of the phenol ammonia wastewater adjusting tank (6) is connected with a biochemical system, the water inlet of an air flotation jet pump (7) is connected with the second water outlet, the water outlet of the air-flotation jet pump (7) is connected with the water inlet of the air-flotation jet device (12), the air inlet of the air-flotation jet device (12) is connected with a nitrogen source, the outlet of the air-flotation jet device (12) is connected with the second water inlet of the coagulation air-flotation tank (4), the air-flotation residue scraping machine (11) is installed at the top of the coagulation air-flotation tank (4), the sludge outlet of the coagulation air-flotation tank (4) is connected with the sludge inlet of the air-flotation oily sludge tank (8), the sludge outlet of the air-flotation oily sludge tank (8) is connected with the sludge inlet of the sludge discharge screw pump (9), the sludge outlet of the sludge discharge screw pump (9) is connected with the sludge inlet of the centrifugal dehydrator (13), the centrifugal dehydrator (13) is also connected with a flocculating agent adding system, and the water outlet of the centrifugal dehydrator (13) is connected with.
2. The pretreatment device for coal gasification wastewater with poor quality according to claim 1, further comprising an air flotation coagulation stirrer (14), wherein the air flotation coagulation stirrer (14) is arranged inside the coagulation reaction tank (3).
3. The apparatus according to claim 1, characterized in that the inlet of the primary oil separation tank (2) is provided with a low pressure steam heating system.
4. The pretreatment device for inferior coal gasification wastewater according to claim 1, wherein the first water outlet of the air floatation water outlet tank (5) is connected with the water inlet of the phenol ammonia wastewater adjusting tank (6) through a U-shaped pipeline.
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| CN201920925611.5U CN210393994U (en) | 2019-06-19 | 2019-06-19 | Inferior coal gasification wastewater pretreatment device |
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| CN201920925611.5U CN210393994U (en) | 2019-06-19 | 2019-06-19 | Inferior coal gasification wastewater pretreatment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156214A (en) * | 2019-06-19 | 2019-08-23 | 中煤平朔集团有限公司 | Gasification of poor coal sewage pretreatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156214A (en) * | 2019-06-19 | 2019-08-23 | 中煤平朔集团有限公司 | Gasification of poor coal sewage pretreatment device |
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