CN112723652A - High-salinity sewage treatment device and method - Google Patents
High-salinity sewage treatment device and method Download PDFInfo
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- CN112723652A CN112723652A CN202011411880.3A CN202011411880A CN112723652A CN 112723652 A CN112723652 A CN 112723652A CN 202011411880 A CN202011411880 A CN 202011411880A CN 112723652 A CN112723652 A CN 112723652A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a high-salinity sewage treatment device and method, which comprises a water inlet pipeline and a water outlet pipeline, wherein the end part of the water inlet pipeline is communicated with a section of high-salinity reverse osmosis membrane device, the section of high-salinity reverse osmosis membrane device is communicated with the water outlet pipeline and is used for discharging filtrate obtained after sewage is subjected to primary high-salinity reverse osmosis through the water outlet pipeline, and the section of high-salinity reverse osmosis membrane device is communicated with a softening device used for softening and filtering sludge through a pipeline. Has the advantages that: the high-salt membrane reverse osmosis is used for treating the smoke washing wastewater and the nanofiltration clear liquid, so that the effluent is ensured to reach the discharge standard, and the smoke washing wastewater and the nanofiltration clear liquid are directly discharged out of the nano tube after being treated; the water amount of the smoke washing waste water and the nanofiltration clear liquid which need to be digested is reduced, and the stable operation of an incineration plant is favorably ensured; the concentration of chloride ions in the discharged water is reduced, and the corrosion hazard of the discharged water to the discharged pipeline is reduced.
Description
Technical Field
The invention relates to the field of high-salinity sewage treatment devices, in particular to a high-salinity sewage treatment device and method.
Background
Incineration is one of the main ways of disposing garbage, in an incineration plant, because the smoke generated in the incineration process needs to be disposed, a large amount of smoke-washing waste water is generated in the process, meanwhile, in recent years, the process mainly based on the membrane bioreactor is increasingly applied to the treatment of the percolate of the municipal solid waste landfill, in the process, the nanofiltration membrane is used for deeply treating the effluent of the landfill waste percolate after the membrane bioreactor process, a large amount of nanofiltration clear liquid can be generated in the operation, but the chloride content of the nanofiltration clear liquid and the smoke washing waste water is 3000-5000mg/l and 14000-20000mg/l which are far higher than the emission limit standard of chloride which can be directly discharged by a nano tube at present, so that the smoke washing waste water and the nano filter clear liquid can not be discharged by the single nano tube, and the smoke washing waste water and the nano filter clear liquid can not be digested by the operation of an incineration plant.
Disclosure of Invention
The invention aims to solve the problems and provide a high-salinity sewage treatment device and method, wherein the high-salinity sewage treatment device and method are used for treating the smoke-washing wastewater and the nanofiltration clear liquid through high-salinity membrane reverse osmosis, so that the effluent is ensured to reach the discharge standard, and the smoke-washing wastewater and the nanofiltration clear liquid are directly discharged out of a nano tube after being treated, and the details are described in the following description.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a high-salinity sewage treatment device, which comprises a water inlet pipeline and a water outlet pipeline, wherein the end part of the water inlet pipeline is communicated with a section of high-salinity reverse osmosis membrane device, the section of high-salinity reverse osmosis membrane device is communicated with the water outlet pipeline and is used for discharging filtrate obtained after sewage is subjected to primary high-salinity reverse osmosis through the water outlet pipeline, the section of high-salinity reverse osmosis membrane device is communicated with a softening device used for softening and filtering sludge through a pipeline, and the softening device is communicated with a sludge treatment device through a pipeline and is used for discharging the sludge into the sludge treatment device for treatment;
the softening device is communicated with a second-stage high-salt reverse osmosis membrane device through a pipeline, the second-stage high-salt reverse osmosis membrane device is communicated with the water outlet pipeline, and filtrate obtained after sewage filtered by the softening device is subjected to reverse osmosis through a secondary high-salt membrane is discharged outside through the water outlet pipeline.
Preferably, the first section of high-salt reverse osmosis membrane device is communicated with a membrane cleaning device through a pipeline and is used for cleaning the first section of high-salt reverse osmosis membrane device again.
Preferably, the membrane cleaning device is provided with a pH and flow meter monitoring instrument for visually monitoring data of the section of the high-salt reverse osmosis membrane device.
Preferably, the designed operating pressure of the first section of high-salt reverse osmosis membrane device and the second section of high-salt reverse osmosis membrane device is 70-80 bar.
Preferably, the two-stage high-salt reverse osmosis membrane device is communicated with a fly ash utilization device through a pipeline and is used for recycling and back-spraying fly ash concentrated solution obtained after sewage filtered by the softening device is subjected to secondary high-salt membrane reverse osmosis.
Preferably, the sludge treatment device specifically comprises: the softening device is communicated with a sludge concentration tank through a pipeline, and the sludge concentration tank is connected with a sludge filter press through a pipeline.
Preferably, the sludge thickener has a capacity of not less than 10 cubic meters.
Preferably, the sludge filter press is a plate-and-frame filter press.
Preferably, the softening device is communicated with a dosing device for adding the heavy metal catching agent through a pipeline.
The application method of the high-salinity sewage treatment device comprises the following steps:
in daily operation, nanofiltration clear liquid and smoke washing waste water are simultaneously fed through the water inlet pipeline and flow to the section of high-salt reverse osmosis membrane device, the section of high-salt reverse osmosis membrane device is used for carrying out reverse osmosis on the nanofiltration clear liquid and the smoke washing waste water through a high-salt membrane for the first time to respectively obtain concentrated liquid and filtrate, the filtrate is directly discharged through the water outlet pipeline and then is discharged through a nano pipe, the concentrated liquid is fed into the softening device through a pipeline to remove hardness, the obtained chemical sludge is discharged into the sludge treatment device through the pipeline to be treated, meanwhile, in order to ensure the quality of subsequent preserved evaporated salt, a preserved heavy metal catching agent can be added into the softening device through the chemical adding device, the sewage softened by the softening device flows to the section of high-salt reverse osmosis membrane device through the pipeline, and the organic matter and salt in the sewage are removed through the second high-salt, and (2) respectively obtaining concentrated liquid and filtrate, directly discharging the permeated filtrate through the water outlet pipeline and then discharging the filtrate through the nano pipe, and conveying the generated concentrated liquid through a pipeline to the fly ash utilization device to utilize and back-spray the concentrated liquid, so that the designed recovery rate of the permeated filtrate is 66.7 percent due to the fact that the sewage entering the first section of high-salt reverse osmosis membrane device can permeate and separate out 66.7 percent of water from the sewage again through the second section of high-salt reverse osmosis membrane device, the overall sewage treatment return rate of the device can reach more than 90 percent, and the nano-filtration clear liquid and the smoke-washing waste water generated by an incineration plant are ensured to reach the discharge standard after being treated, and then are directly discharged through the nano pipe.
Has the advantages that: 1. the high-salt membrane reverse osmosis is used for treating the smoke washing wastewater and the nanofiltration clear liquid, so that the effluent is ensured to reach the discharge standard, and the smoke washing wastewater and the nanofiltration clear liquid are directly discharged out of the nano tube after being treated;
2. the water amount of the smoke washing waste water and the nanofiltration clear liquid which need to be digested is reduced, and the stable operation of an incineration plant is favorably ensured;
3. the concentration of chloride ions in the discharged water is reduced, and the corrosion hazard of the discharged water to the discharged pipeline 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 the drawings without creative efforts.
Fig. 1 is a block diagram of the present invention.
The reference numerals are explained below:
1. a sludge treatment device; 101. a sludge filter press; 102. a sludge concentration tank; 2. a fly ash utilization device; 3. a two-stage high-salt reverse osmosis membrane device; 4. a water outlet pipeline; 5. a membrane cleaning device; 6. a section of high salt reverse osmosis membrane device; 7. a softening device; 701. a dosing device; 8. a water inlet pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1, the invention provides a high-salinity sewage treatment device, which comprises a water inlet pipeline 8 and a water outlet pipeline 4, wherein the end part of the water inlet pipeline 8 is communicated with a section of high-salinity reverse osmosis membrane device 6, the section of high-salinity reverse osmosis membrane device 6 is communicated with the water outlet pipeline 4 and is used for discharging filtrate obtained after sewage is subjected to primary high-salinity reverse osmosis through the water outlet pipeline 4, the section of high-salinity reverse osmosis membrane device 6 is communicated with a softening device 7 used for softening and filtering sludge through a pipeline, and the softening device 7 is communicated with a sludge treatment device 1 through a pipeline and is used for discharging sludge into the sludge treatment device 1 for treatment. The softening device 7 is communicated with a second-stage high-salt reverse osmosis membrane device 3 through a pipeline, the second-stage high-salt reverse osmosis membrane device 3 is communicated with the water outlet pipeline 4, and filtrate obtained after sewage filtered by the softening device 7 passes through the secondary high-salt membrane reverse osmosis is discharged outside through the water outlet pipeline 4.
As the preferred scheme of present case, one section high salt reverse osmosis membrane device 6 has membrane belt cleaning device 5 through the pipeline intercommunication, be used for resuming washing one section high salt reverse osmosis membrane device 6, so set up, be convenient for wash one section high salt reverse osmosis membrane device 6 through membrane belt cleaning device 5, ensure the high-efficient stable dialysis operation of one section high salt reverse osmosis membrane device 6, membrane belt cleaning device 5 is provided with pH and flowmeter monitoring instrument, be used for the data of one section high salt reverse osmosis membrane device 6 of visual monitoring, so set up, be convenient for can know the state of one section high salt reverse osmosis membrane device 6 in real time through membrane belt cleaning device 5.
Design operating pressure of one section high salt reverse osmosis membrane device 6 and two-stage process high salt reverse osmosis membrane device 3 is 70 ~ 80bar, so set up, be convenient for one section high salt reverse osmosis membrane device 6 and two-stage process high salt reverse osmosis membrane device 3 all have stable operating condition, two-stage process high salt reverse osmosis membrane device 3 has flying dust to utilize device 2 through the pipeline intercommunication, be used for passing through the flying dust dense fluid reuse who obtains behind the high salt membrane reverse osmosis of secondary with the sewage that softening installation 7 filtered out spouts, so set up, be convenient for carry out iterative utilization to the dense fluid through flying dust utilization device 2.
The sludge treatment device 1 is specifically: softening installation 7 has sludge thickening tank 102 through the pipeline intercommunication, and sludge thickening tank 102 has sludge press 101 through the pipe connection, so sets up, is convenient for carry out the concentration to chemical sludge through sludge thickening tank 102, later through sludge press 101 to the chemical sludge filter-pressing after the concentration, the capacity of sludge thickening tank 102 is not less than 10 cubic meters to sludge thickening tank 102 has sufficient capacity to hold the chemical sludge who transports.
Sludge press 101 is the plate and frame filter press to sludge press 101 has good efficient user state, and the mud cake moisture content that preferred filter-pressing obtained is less than 70%, and softening installation 7 department has a charge device 701 that is used for adding the heavy metal trapping agent through the pipeline intercommunication, so set up, is convenient for guarantee the salt quality that follow-up reservation evaporation obtained.
The application method of the high-salinity sewage treatment device comprises the following steps:
when in use, in daily operation, the nanofiltration clear liquid and the smoke washing waste water are simultaneously introduced through the water inlet pipeline 8 and flow to the first section of high-salt reverse osmosis membrane device 6, the first section of high-salt reverse osmosis membrane device 6 respectively obtains concentrated liquid and filtrate after the nanofiltration clear liquid and the smoke washing waste water are subjected to primary high-salt membrane reverse osmosis, the filtrate is directly discharged through the water outlet pipeline 4 and then is discharged through a nano pipe, the concentrated liquid is introduced into the softening device 7 through a pipeline to remove hardness, the obtained chemical sludge is discharged into the sludge treatment device 1 through a pipeline to be treated, meanwhile, in order to ensure the quality of subsequent preserved evaporated salt, a reserved heavy metal catching agent can be added into the softening device 7 through the chemical adding device 701, the sewage softened by the softening device 7 flows to the second section of high-salt reverse osmosis membrane device 3 through a pipeline, the second section of high-salt reverse osmosis membrane, the concentrated solution and the filtrate are respectively obtained, the permeated filtrate is directly discharged through the water outlet pipeline 4 and then is discharged through the nano pipe, the generated concentrated solution is subjected to concentrated solution utilization and back spray through the pipeline conveying value fly ash utilization device 2, so that the designed recovery rate of the permeated filtrate is 66.7 percent due to the fact that the sewage enters the first section of high-salt reverse osmosis membrane device 6, namely 30 percent of concentrated solution generated by the first section of high-salt reverse osmosis membrane device 6 can be permeated out of 66.7 percent of water again through the second section of high-salt reverse osmosis membrane device 3, the overall sewage treatment recovery rate of the device can reach more than 90 percent, the discharge standard of nano-filtered clear solution and smoke-washing wastewater generated by an incineration plant is ensured to be reached after the treatment, and then the nano pipe is directly discharged.
The operational effects of the above-described approach can be displayed according to the following table: table one shows the parameters of the smoke washing wastewater before upgrading, which are as follows:
table two shows parameters of the nanofiltration clear liquid before the nanofiltration clear liquid is subjected to standard extraction, specifically as follows:
| item | Unit of | NF clear liquid |
| pH | / | 7.2 |
| Total hardness | mg/L | 825 |
| Hardness of calcium | mg/L | 125 |
| Chloride compound | mg/L | 4450 |
| Sulfate radical | mg/L | 58 |
| Silicon | mg/L | 16.2 |
| Fluorine | mg/L | 0.4 |
| CODcr | mg/L | 48 |
| Ammonia nitrogen | mg/L | Not detected out |
| Total alkalinity | mg/L | 775 |
| TDS | mg/L | 8230 |
| TP | mg/L | 0.17 |
Table three is the water production data of the high salt film from the filtrate after treatment, as follows:
the above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The utility model provides a high salinity sewage treatment plant, includes inlet channel (8) and outlet conduit (4), its characterized in that: the end part of the water inlet pipeline (8) is communicated with a section of high-salt reverse osmosis membrane device (6), the section of high-salt reverse osmosis membrane device (6) is communicated with the water outlet pipeline (4) and used for discharging filtrate obtained after sewage is subjected to primary high-salt membrane reverse osmosis outside the water outlet pipeline (4), the section of high-salt reverse osmosis membrane device (6) is communicated with a softening device (7) used for softening and filtering sludge through a pipeline, and the softening device (7) is communicated with a sludge treatment device (1) through a pipeline and used for discharging sludge into the sludge treatment device (1) for treatment;
the softening device (7) is communicated with a second-stage high-salt reverse osmosis membrane device (3) through a pipeline, the second-stage high-salt reverse osmosis membrane device (3) is communicated with the water outlet pipeline (4), and filtrate obtained after sewage filtered by the softening device (7) is subjected to reverse osmosis through a secondary high-salt membrane is discharged outside through the water outlet pipeline (4).
2. The apparatus of claim 1, wherein: one section high salt reverse osmosis membrane device (6) have membrane belt cleaning device (5) through the pipeline intercommunication for to resume the washing in one section high salt reverse osmosis membrane device (6).
3. The apparatus of claim 2, wherein: the membrane cleaning device (5) is provided with a pH and flowmeter monitoring instrument for visually monitoring data of the section of the high-salt reverse osmosis membrane device (6).
4. The apparatus for treating high-salinity sewage according to claim 2 or 3, wherein: the designed operating pressure of the first section of high-salt reverse osmosis membrane device (6) and the second section of high-salt reverse osmosis membrane device (3) is 70-80 bar.
5. The apparatus of claim 4, wherein: the two-section high-salt reverse osmosis membrane device (3) is communicated with a fly ash utilization device (2) through a pipeline and is used for recycling and back-spraying fly ash concentrated liquid obtained after sewage filtered by the softening device (7) is subjected to secondary high-salt membrane reverse osmosis.
6. The apparatus of claim 5, wherein: the sludge treatment device (1) is specifically as follows: the softening device (7) is communicated with a sludge concentration tank (102) through a pipeline, and the sludge concentration tank (102) is connected with a sludge filter press (101) through a pipeline.
7. The apparatus of claim 6, wherein: the capacity of the sludge concentration tank (102) is not less than 10 cubic meters.
8. The apparatus of claim 7, wherein: the sludge filter press (101) is a plate-and-frame filter press.
9. The apparatus for treating high salinity sewage according to claim 6, 7 or 8, characterized in that: the softening device (7) is communicated with a dosing device (701) used for adding a heavy metal catching agent through a pipeline.
10. The use method of the high-salinity sewage treatment device according to claim 9, characterized in that: in daily operation, nanofiltration clear liquid and smoke washing wastewater are simultaneously introduced through the water inlet pipeline (8) and flow to the section of high-salt reverse osmosis membrane device (6), the section of high-salt reverse osmosis membrane device (6) is used for carrying out primary high-salt membrane reverse osmosis on the nanofiltration clear liquid and the smoke washing wastewater to respectively obtain concentrated liquid and filtrate, the filtrate is directly discharged through the water outlet pipeline (4) and then is discharged through a nano pipe, the concentrated liquid is introduced into the softening device (7) through a pipeline to remove hardness, the obtained chemical sludge is discharged into the sludge treatment device (1) through a pipeline to be treated, meanwhile, in order to ensure the quality of subsequent preserved evaporated salt, a reserved heavy metal catching agent is added into the softening device (7) through the dosing device (701), and the wastewater softened by the softening device (7) flows to the second section of high-salt reverse osmosis membrane device (3) through a pipeline, the second section of high-salt reverse osmosis membrane device (3) removes organic matters and salt in sewage after reverse osmosis of the secondary high-salt membrane to respectively obtain concentrated solution and filtrate, the permeated filtrate is directly discharged through the water outlet pipeline (4) and then is discharged through a storage pipe, the generated concentrated solution is conveyed through a pipeline to the fly ash utilization device (2) for utilizing and back-spraying the concentrated solution, so that the design recovery rate of the permeated filtrate is 66.7 percent due to the sewage entering the first section of high-salt reverse osmosis membrane device (6), namely 30 percent of concentrated solution generated by the first section of high-salt reverse osmosis membrane device (6) can be used for separating out 66.7 percent of water again through the second section of high-salt reverse osmosis membrane device (3), the overall sewage treatment return rate of the device can reach more than 90 percent, and the nanofiltration clear liquid and the smoke-washing wastewater generated by an incineration plant can reach the discharge standard after being treated, then directly discharging the nano-tubes.
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