CN212334622U - Waste water recycling system for fly ash stabilization treatment process - Google Patents
Waste water recycling system for fly ash stabilization treatment process Download PDFInfo
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- CN212334622U CN212334622U CN202020414341.4U CN202020414341U CN212334622U CN 212334622 U CN212334622 U CN 212334622U CN 202020414341 U CN202020414341 U CN 202020414341U CN 212334622 U CN212334622 U CN 212334622U
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Abstract
The utility model discloses a fly ash stabilization treatment process wastewater recycling system, which comprises a wastewater pulping and recycling unit, a filter cloth washing wastewater recycling unit, a sealing belt sealing water recycling unit and a vacuum pump cooling water recycling unit; the waste water pulping and recycling unit comprises a waste water pool, a pulping water pump, a pulping machine, a pulp storage tank and a suction filter which are sequentially connected through a process pipeline, wherein a filtrate outlet of the suction filter is connected with the waste water pool through a pipeline; the filter cloth washing wastewater recovery unit comprises a wastewater pool, a washing water pump and a filter cloth washing nozzle of the suction filtration machine which are sequentially connected through a process pipeline; the sealing belt sealing water recovery unit comprises a sealing water pump; the vacuum pump cooling water recovery unit comprises a water bucket for collecting and storing circulating cooling water of the vacuum pump, and the water bucket is further connected with the wastewater pool through a pipeline. The advantages are that: 1) solves the problem that a large amount of wastewater is difficult to treat in the PDS high-efficiency fly ash stabilization process; 2) the consumption of industrial water is obviously reduced; 3) the addition amount of the chelating agent is reduced.
Description
Technical Field
The utility model relates to a vice useless processing technology, especially a garbage power flying dust processing technology.
Background
With the popularization of the household garbage incineration power generation technology in the treatment of household garbage in China cities, the treatment and disposal of fly ash generated by garbage incineration become one of the important problems which puzzle people in production and life.
The national hazardous waste record (2016) (hereinafter "record of names") released by the ministry of environmental protection in association with the national development and reform committee and the ministry of public security was filed from 2016 (8.1.8.1). The fly ash is selected from the famous records and listed in the dangerous waste exempted management list of the famous records, and the exempted condition is to treat the fly ash, so that the fly ash can reasonably enter a domestic garbage site for landfill treatment after reaching the standard, and market space is opened for chelation treatment of the fly ash.
The fly ash stabilizing process is characterized in that a chelating agent reacts with easily-percolated heavy metal in the waste incineration fly ash to generate insoluble, stable and harmless substances, so that the national standard on safe landfill is reached. The fly ash stabilization technology has simple process, good stabilization effect and low treatment cost, and is more and more commonly applied to harmless treatment of waste incineration fly ash.
The typical practice of the present fly ash stabilization treatment is: the dry fly ash and the chelating agent are mixed according to a certain proportion, and then are uniformly stirred to prepare a stable sticky solid matrix which can be stored or buried.
In order to meet the national relevant regulations, the water content of the treated fly ash must be lower than 30%, so the addition amount of the liquid chelating agent and the addition amount of water need to be controlled in the stabilizing treatment process, or the sticky solid matrix must be dried in a later period.
The biggest problem of the present fly ash stabilization process is that the detection qualification rate is low, namely, the treated fly ash is not easy to meet the regulation of GB16889-2008 about the limit value of the concentration of pollutants in the fly ash leachate of the incineration of the household garbage, and the detection qualification rate is usually about 60%. Secondly, a large amount of dust is easily generated in the production process, so that the field working environment is extremely severe and the equipment can be corroded. In addition, ammonia water or urea is required to be added in the flue gas treatment process after the waste incineration, and ammonia in the fly ash can escape in a large amount in the chelation and conveying processes, so that the fly ash solidification workshop has a very strong ammonia smell, and the eyes, the skin and the respiratory organs of operators are damaged.
In order to solve the above problems, patent document CN109013654A discloses a PDS high efficiency fly ash stabilization process, which is characterized in that an organic retarder is added on the basis of the prior art, fly ash and a chelating agent are prepared into a high water content liquid slurry for dehydration, and finally, excessive water is removed by dehydration, so that the qualification rate of fly ash chelation is remarkably improved, the operating environment is improved, and the process has remarkable progress.
Meanwhile, because a large amount of wastewater is generated after the slurry is dehydrated according to the scheme, the wastewater obtained after dehydration cannot meet the discharge standard, and therefore the wastewater needs to be purified, recycled or treated in other ways. However, the wastewater contains a large amount of salts, chelates, activated carbon, calcium ions, short and fine fibers, suspended matters, ammonia compounds, etc., and the pH reaches 11 or more. If the purification method is adopted, the treatment cost is high, and the method cannot be implemented in the industry at all. Therefore, how to treat the wastewater generated by the "PDS high efficiency fly ash stabilization process" is a problem to be solved currently.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of treating the wastewater generated by the high-efficiency fly ash stabilization process of PDS, the utility model provides a wastewater recycling system for the fly ash stabilization treatment process.
The utility model adopts the technical proposal that: the waste water recycling system for the fly ash stabilization treatment process comprises a waste water pulping and recycling unit, a filter cloth flushing waste water recycling unit, a sealing belt sealing water recycling unit and a vacuum pump cooling water recycling unit;
the wastewater pulping and recycling unit comprises a wastewater pool, a pulping water pump, a pulping machine, a pulp storage tank and a suction filter which are sequentially connected through a process pipeline, wherein a filtrate outlet of the suction filter is connected with the wastewater pool through a pipeline;
the filter cloth washing wastewater recovery unit comprises a wastewater pool and a washing water pump which are sequentially connected through a process pipeline, and the washing water pump is connected with a filter cloth washing nozzle of the suction filter; the water after washing the filter cloth can naturally flow into a wastewater pool;
the sealing belt sealing water recovery unit comprises a sealing water pump, a water inlet of the sealing water pump is connected with an industrial water pipeline, a water outlet of the sealing water pump is connected with a sealing belt of the suction filter, and used sealing water can flow into a water barrel;
the vacuum pump cooling water recovery unit comprises a bucket for collecting and storing circulating cooling water of the vacuum pump, the bucket is further connected with the wastewater pool through a pipeline, and a valve is arranged on the pipeline connecting the bucket and the wastewater pool.
The sources of the wastewater obtained after the dehydration of the PDS high-efficiency fly ash stabilization process comprise: water separated from the slurry, sewage obtained after washing filter cloth on the dewatering equipment, cooling water and sealing water of the dewatering equipment. Taking 100t of dry ash treated every day as an example, working for 20 hours every day, and cooling with 6-10 m of water3H, 8m of washing water3More than h, sealing water 0.3m3Assuming that a slurry with a water content of 70% is prepared, the water content of the dewatered cake is 36.7%, and the calculation shown in FIG. 1 shows that the daily consumption of industrial water (or other water quality meeting the drainable standard) is 516t or more, and the generation of wastewater is 461t or more.
The sewage is light yellow, contains a large amount of suspended matters, ammonia, chelate and the like, and has a pH value of more than 11. The daily sewage treatment cost is high and the difficulty is high.
As shown in figure 2, the utility model discloses a make the thick liquids of moisture content 50% ~ 90% in utilizing the water pump to take out to the pulping machine with the waste water in the wastewater disposal basin, during thick liquids carried to thick liquids holding vessel, then utilized the diaphragm pump to take out to dewater in the suction filter in the black dotted line frame, the water of deviating from gets into the wastewater disposal basin.
The heavy metal content in fly ash can vary greatly in different seasons in different regions. Therefore, the formula of the chelating agent for treating heavy metals in the fly ash is different, and the water quality of the waste water left after the slurry is dehydrated is also greatly different. Through a large number of experiments, if the waste water is alkaline, the circulating pulping can be carried out. If the pH value is between 10 and 12, a certain amount of effective components of the chelating agent remain in the wastewater, and the use amount of the chelating agent can be saved by about 0.5 percent after cyclic pulping. If the pH value exceeds 12, the consumption of the chelating agent is obviously increased when the pulping is circulated.
The filter cloth of the suction filter needs to be washed clean to keep the dehydration effect. Therefore, the filter cloth is flushed after the wastewater in the wastewater tank is pressurized by the flushing pump.
The sealing belts in the suction filter need to work normally and clean water is needed as sealing water. Industrial water of a factory is used as sealing water here.
In the dehydration process, the vacuum pump must be cooled with clean water, and industrial water of a factory is used as cooling water. As shown in FIG. 2, cooling water is collected into a water tank after passing through a vacuum pump, then a No. 2 ball valve is closed, and the cooling water in the water tank enters the vacuum pump again for recycling. When the temperature of water in the water barrel is higher than a certain value (such as 50 ℃), opening a No. 4 ball valve, introducing high-temperature water into a wastewater tank, opening a No. 2 ball valve, and repeating the steps.
For the first run, the lagoon can be replenished with sufficient industrial water to ensure adequate water for filter cloth flushing and pulping. After a period of time, the sediment in the wastewater tank can be cleaned by a sewage suction truck or other modes, and then filled into a ton bag for landfill.
The scheme can greatly save the water consumption of industrial water, and the wastewater is not discharged outside, so that the method is economic and environment-friendly.
As can be seen from the comparison between fig. 1 and fig. 3, if fly ash 100t is treated every day, the present invention can save industrial water 461t every day.
As shown in FIG. 3, the amount of the chelating agent added was 3%. If the pH value of the wastewater is controlled to be 10-12, the chelating agent can be saved by 0.5%, namely the addition amount of the chelating agent is 2.5t, the chelating agent is saved by 0.5t every day, and the industrial water is saved by 460.5t every day.
The utility model has the advantages that: 1) solves the problem that a large amount of wastewater is difficult to treat in the PDS high-efficiency fly ash stabilization process; 2) the consumption of industrial water is obviously reduced; 3) the amount of chelating agent added can also be reduced.
Drawings
FIG. 1 is a schematic diagram of the calculation of the amount of wastewater in the "PDS high efficiency fly ash stabilization process".
FIG. 2 is a flow chart of the wastewater recycling system for the fly ash stabilization treatment process of the present invention.
FIG. 3 is a schematic view of the water balance calculation of the wastewater recycling system for fly ash stabilization treatment process of the present invention.
Labeled as: 1-a wastewater pond, 2-a pulping water pump, 3-a pulping machine, 4-a pulp storage tank, 5-a suction filter, 6-a washing water pump, 7-a sealing water pump and 8-a bucket.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in figure 2, the waste water recycling system for the fly ash stabilization treatment process of the utility model comprises a waste water pulping and recycling unit, a filter cloth washing waste water recycling unit, a sealing belt sealing water recycling unit and a vacuum pump cooling water recycling unit;
the wastewater pulping and recycling unit comprises a wastewater pool 1, a pulping water pump 2, a pulping machine 3, a pulp storage tank 4 and a suction filter 5 which are sequentially connected through a process pipeline, wherein a filtrate outlet of the suction filter 5 is connected with the wastewater pool 1 through a pipeline;
the filter cloth washing wastewater recovery unit comprises a wastewater pool 1 and a washing water pump 6 which are sequentially connected through a process pipeline, wherein the washing water pump 6 is connected with a filter cloth washing nozzle of a suction filter 5; the water after washing the filter cloth can naturally flow into the wastewater tank 1;
the sealing belt sealing water recovery unit comprises a sealing water pump 7, a water inlet of the sealing water pump 7 is connected with an industrial water pipeline, a water outlet of the sealing water pump is connected with a sealing belt of the suction filter 5, and used sealing water can flow into a water barrel 8;
vacuum pump cooling water recovery unit is including being used for collecting the cask 8 of storing vacuum pump recirculated cooling water, cask 8 still is connected with wastewater disposal basin 1 through the pipeline, is provided with the 4# ball valve on the pipeline that cask 8 and wastewater disposal basin 1 are connected.
When the vacuum pump works, industrial water is used as sealing water of a sealing belt of the suction filter 5 and cooling water of the vacuum pump, waste water generated after dehydration of the suction filter 5 is connected into the waste water pool 1 through a pipeline of the vacuum tank, and the waste water after washing filter cloth naturally flows into the waste water pool 1. The waste water in the waste water pool 1 can be pressurized to about 0.8MPa by a washing water pump 6 and then washed by filter cloth, and can also be pumped into a pulping machine 3 by a pulping water pump 2 for circular pulping. The cooling water of the vacuum pump is collected by a water tank 8 or other containers for recycling, the temperature of the cooling water gradually rises along with the time, and when the temperature of the cooling water is more than a certain value (for example, 50 ℃), a No. 4 ball valve is opened to introduce high-temperature water into the wastewater tank 1. As can be seen from the calculation of FIG. 3, the water content of the filter cake after dehydration is 36.7%, and the water taken away by the filter cake can be supplemented by cooling water, and only 22t of cooling water is needed to be consumed every day.
Claims (1)
1. The waste water recycling system for the fly ash stabilization treatment process is characterized in that: comprises a wastewater pulping and recycling unit, a filter cloth flushing wastewater recycling unit, a sealing belt sealing water recycling unit and a vacuum pump cooling water recycling unit;
the wastewater pulping and recycling unit comprises a wastewater pool (1), a pulping water pump (2), a pulping machine (3), a pulp storage tank (4) and a suction filter (5) which are sequentially connected through a process pipeline, wherein a filtrate outlet of the suction filter (5) is connected with the wastewater pool (1) through a pipeline;
the filter cloth washing wastewater recovery unit comprises a wastewater pool (1) and a washing water pump (6) which are sequentially connected through a process pipeline, wherein the washing water pump (6) is connected with a filter cloth washing nozzle of the suction filter (5); the water after washing the filter cloth can naturally flow into the wastewater tank (1);
the sealing belt sealing water recovery unit comprises a sealing water pump (7), a water inlet of the sealing water pump (7) is connected with an industrial water pipeline, a water outlet of the sealing water pump is connected with a sealing belt of the suction filter (5), and used sealing water can flow into a water barrel (8);
the vacuum pump cooling water recovery unit comprises a water bucket (8) used for collecting circulating cooling water of a storage vacuum pump, the water bucket (8) is further connected with the wastewater pool (1) through a pipeline, and a valve is arranged on the pipeline connecting the water bucket (8) and the wastewater pool (1).
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| CN202020414341.4U CN212334622U (en) | 2020-03-27 | 2020-03-27 | Waste water recycling system for fly ash stabilization treatment process |
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| CN202020414341.4U CN212334622U (en) | 2020-03-27 | 2020-03-27 | Waste water recycling system for fly ash stabilization treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7237133B1 (en) | 2021-11-30 | 2023-03-10 | 太平洋セメント株式会社 | Method for desalting chlorine-containing powder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7237133B1 (en) | 2021-11-30 | 2023-03-10 | 太平洋セメント株式会社 | Method for desalting chlorine-containing powder |
| WO2023100541A1 (en) * | 2021-11-30 | 2023-06-08 | 太平洋セメント株式会社 | Method for desalting treatment of chlorine-containing powder |
| JP2023080949A (en) * | 2021-11-30 | 2023-06-09 | 太平洋セメント株式会社 | Desalination treatment method for chlorine-containing powder |
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Address after: 610000 No. 507, floor 5, No. 6, Haijiao street, Jinjiang District, Chengdu, Sichuan Patentee after: CHENGDU HENGXINHE ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Address before: No.408, 4th floor, building 1, No.6 haijiaoshi street, Jinjiang District, Chengdu, Sichuan 610000 Patentee before: CHENGDU HENGXINHE ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. |