CN212425666U - Desulfurization waste water zero discharge system - Google Patents
Desulfurization waste water zero discharge system Download PDFInfo
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- CN212425666U CN212425666U CN202020549777.4U CN202020549777U CN212425666U CN 212425666 U CN212425666 U CN 212425666U CN 202020549777 U CN202020549777 U CN 202020549777U CN 212425666 U CN212425666 U CN 212425666U
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- 239000002351 wastewater Substances 0.000 title claims abstract description 76
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 48
- 230000023556 desulfurization Effects 0.000 title claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000006243 chemical reaction Methods 0.000 claims abstract description 53
- 238000004062 sedimentation Methods 0.000 claims abstract description 47
- 238000001556 precipitation Methods 0.000 claims abstract description 35
- 239000012528 membrane Substances 0.000 claims abstract description 27
- 238000009388 chemical precipitation Methods 0.000 claims abstract description 23
- 238000005374 membrane filtration Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000010802 sludge Substances 0.000 claims description 50
- 238000005273 aeration Methods 0.000 claims description 22
- 238000001223 reverse osmosis Methods 0.000 claims description 19
- 238000001728 nano-filtration Methods 0.000 claims description 15
- 238000000108 ultra-filtration Methods 0.000 claims description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 239000003546 flue gas Substances 0.000 claims description 9
- 229910052602 gypsum Inorganic materials 0.000 claims description 8
- 239000010440 gypsum Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 150000003839 salts Chemical class 0.000 claims description 7
- 230000015271 coagulation Effects 0.000 claims description 5
- 238000005345 coagulation Methods 0.000 claims description 5
- 238000005189 flocculation Methods 0.000 claims description 5
- 230000016615 flocculation Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000008234 soft water Substances 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 230000008719 thickening Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- -1 fluorine ions Chemical class 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 125000001741 organic sulfur group Chemical group 0.000 description 2
- 239000003002 pH adjusting agent Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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Abstract
The utility model belongs to the environmental protection field, relates to the desulfurization waste water field, in particular to a desulfurization waste water zero discharge system, which comprises a pre-precipitation system, a chemical reaction and precipitation system and a combined membrane filtration system, wherein the pre-precipitation system carries out preliminary precipitation and water quantity regulation on the desulfurization waste water and conveys the desulfurization waste water to the chemical reaction and precipitation system; the chemical reaction and precipitation system carries out advanced treatment on the wastewater in a chemical reaction and precipitation mode, and then the wastewater is introduced into the combined membrane filtration system; the combined membrane filtration system utilizes a membrane process to treat wastewater, and produced water and concentrated water are respectively recycled for different process sections. The utility model provides a problem of the unable retrieval and utilization of current desulfurization waste water back waste water, utilize the cooperation of preliminary sedimentation system, chemical reaction and sedimentation system and combination membrane filtration system, with filtrating, dense water recycle in different technology sections, realized the waste water zero release.
Description
Technical Field
The utility model belongs to the environmental protection field relates to desulfurization waste water field, concretely relates to desulfurization waste water zero discharge system.
Background
Along with the development of national economy, the power demand is more and more increased, the environmental protection policy of national and local governments is more and more strict, and the flue gas of the active and new coal-fired boiler projects needs to be desulfurized so as to ensure that the flue gas reaches the standard and is discharged. The most common desulfurization method at present is wet desulfurization, namely a limestone-gypsum method process, which has low investment and operation cost and mature process and becomes the mainstream process of desulfurization worldwide.
The main byproducts of the limestone-gypsum method process are gypsum and desulfurization wastewater, wherein the desulfurization wastewater is weakly acidic and contains a large amount of impurities, and most of the desulfurization wastewater is pollutants in the comprehensive wastewater discharge standard, so that the wastewater needs to be strictly treated and can be discharged after reaching the national or local environmental protection standard.
At present, the desulfurization wastewater is mainly treated by a physical and chemical treatment method, but the treatment method has the problems of large occupied area, high investment cost, complex process flow, large amount of chemical sludge generation, high energy consumption, incapability of removing chloride ions and the like, the chloride ions have high corrosivity in a slightly acidic water environment, the treated wastewater cannot be recycled, and the application of the method is limited along with the improvement of the environmental protection requirement.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model provides a zero discharge system of desulfurization waste water has solved the problem of the unable retrieval and utilization of current desulfurization waste water treatment back waste water, utilizes the cooperation of preliminary sedimentation system, chemical reaction and sedimentation system and combination membrane filtration system, uses filtrating, dense water circulation in different process sections, has realized the zero discharge of waste water.
In order to realize the technical purpose, the technical proposal of the utility model is that:
the desulfurization wastewater zero-discharge system comprises a pre-precipitation system, a chemical reaction and precipitation system and a combined membrane filtration system, wherein the pre-precipitation system is used for carrying out primary precipitation and water quantity regulation on desulfurization wastewater and conveying the desulfurization wastewater to the chemical reaction and precipitation system; the chemical reaction and precipitation system carries out advanced treatment on the wastewater in a chemical reaction and precipitation mode, and then the wastewater is introduced into the combined membrane filtration system; the combined membrane filtration system utilizes a membrane process to treat wastewater, and produced water and concentrated water are respectively recycled for different process sections.
The pre-precipitation system comprises a pre-precipitation tank and an adjusting tank which are operated in parallel, wherein the pre-precipitation tank adopts a batch operation mode to perform standing precipitation, and the standing precipitation time is 24-36 h; the mud of preliminary sedimentation tank is discharged to the emergent pond of mud in, waste water in the preliminary sedimentation tank lets in to the equalizing basin in, the equalizing basin intercommunication chemical reaction and sedimentation system. Desulfurization waste water directly discharges to the preliminary sedimentation pond in through the pipeline, then carries out the mode of batch processing at the preliminary sedimentation pond and deposits, directly discharges the mud in the preliminary sedimentation pond into to the emergent pond of mud in, waste water discharges into to the equalizing basin through the pipeline, and the equalizing basin carries out water regulation to the waste water after the preliminary sedimentation, then directly lets in to chemical reaction and sedimentation system.
The chemical reaction and precipitation system comprises a pH adjusting tank, a reaction tank, a precipitation tank, a sludge concentration tank and a pipeline type aeration membrane, the pre-precipitation system is communicated with the pH adjusting tank, the wastewater after pre-precipitation treatment is introduced into the pH adjusting tank, and the pH adjusting tank adopts sodium hydroxide as a pH adjusting agent to adjust the pH of the desulfurization wastewater; the reaction tank is communicated with the pH adjusting tank, calcium chloride and organic sulfur are added into the reaction tank, and heavy metal ions and fluorine ions in the wastewater are removed; the sedimentation tank is a coagulation flocculation sedimentation tank and is communicated with the reaction tank, PAC and PAM are added in the sedimentation tank, the PAC and the PAM form coagulation reaction and flocculation reaction in the wastewater, and sediment is deposited at the bottom; the sedimentation tank intercommunication has sludge thickening pond and aeration membrane unit, and the sediment in the sedimentation tank fills in sludge thickening pond, and waste water in the sedimentation tank directly lets in the aeration membrane unit, adopt pipeline formula aeration membrane in the aeration membrane unit, utilize small-size air compressor machine to squeeze air into in the pipeline formula aeration membrane, the drainage is directly squeezed into to combination membrane filtration system, concentrate in the aeration membrane unit directly returns to and is discharged into in the pH adjusting tank, with the alkaline recycle of dense water itself to the pH adjusting tank in, plays the effect of adjusting pH, simultaneously along with the continuous circulation of dense water, the solute in dense water passes through reaction tank and sedimentation tank reaction again, reaches the purpose of getting rid of. Furthermore, the sedimentation tank and the aeration membrane unit are provided with an intermediate water tank which has a good buffering effect. The sludge concentration tank is communicated with a sludge treatment system, and the sludge is treated in a centralized manner through the sludge treatment system.
The combined membrane filtration system comprises an ultrafiltration unit, a reverse osmosis unit and a nanofiltration unit, wherein the water inlet end of the ultrafiltration unit is communicated with the chemical reaction and filtration system, the water outlet end of the ultrafiltration unit is communicated with the reverse osmosis unit, the concentrated water end of the reverse osmosis unit is communicated with the nanofiltration unit, the concentrated water end of the nanofiltration unit is communicated with a flue gas desulfurization water tank, and the green water section is communicated with a salt dissolving tank of a soft water workshop; introducing the wastewater subjected to the chemical reaction and precipitation system into an ultrafiltration water pump for filtration treatment, directly discharging the impurities subjected to ultrafiltration treatment into a sludge emergency pool, and directly introducing the filtered water into a reverse osmosis unit; the filtered water treated by the ultrafiltration unit enters the reverse osmosis unit for reverse osmosis treatment, the filtered water treated by the reverse osmosis unit is pumped into a reuse water tank, the subsequent water quantity for an adjusting tank is adjusted, the concentrated water treated by the reverse osmosis unit is pumped into the nanofiltration unit, the filtered water treated by the nanofiltration unit is pumped into a salt dissolving tank in a soft water workshop for dissolving salt, and the concentrated water treated by the nanofiltration unit is pumped into a flue gas desulfurization water tank for desulfurization and washing of flue gas.
The sludge treatment system comprises a sludge delivery pump and a pressure filter, wherein the sludge in the sludge concentration tank is directly pumped into the pressure filter by the sludge delivery pump, the pressure filter presses the sludge to form dry sludge, the dry sludge takes calcium sulfate as a main component and is directly used as a raw material on a gypsum production line, and filtrate generated by the pressure filter flows back to the pre-sedimentation tank and is pumped into the regulating tank.
As can be seen from the above description, the present invention has the following advantages:
1. the invention solves the problem that the waste water after the existing desulfurization waste water treatment can not be recycled, and filtrate and concentrated water are recycled in different process sections by utilizing the cooperation of a pre-precipitation system, a chemical reaction and precipitation system and a combined membrane filtration system, thereby realizing zero discharge of the waste water.
2. The invention carries out filter pressing after the sludge concentration treatment, and is used for a gypsum production line, thereby achieving real pollution-free treatment, and realizing real zero emission by recycling the treated desulfurization wastewater.
Drawings
FIG. 1 is a schematic flow diagram of an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a pre-precipitation system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic flow diagram of a chemical reaction and precipitation system in accordance with an embodiment of the present invention;
FIG. 4 is a schematic flow diagram of an integrated membrane filtration system according to an embodiment of the present invention;
FIG. 5 is a schematic flow diagram of a sludge treatment system in an embodiment of the present invention.
Detailed Description
With reference to fig. 1 to 5, a specific embodiment of the present invention is described in detail, but the present invention is not limited to the claims.
As shown in fig. 1 to 5, the desulfurization wastewater zero discharge system includes a pre-precipitation system, a chemical reaction and precipitation system, and a combined membrane filtration system, wherein the pre-precipitation system performs preliminary precipitation, water quantity adjustment, and conveys the desulfurization wastewater to the chemical reaction and precipitation system; the chemical reaction and precipitation system carries out advanced treatment on the wastewater in a chemical reaction and precipitation mode, and then the wastewater is introduced into the combined membrane filtration system; the combined membrane filtration system utilizes a membrane method to treat wastewater, and produced water and concentrated water are respectively reused in different process sections so as to basically realize the aim of zero discharge of the wastewater.
The pre-precipitation system comprises a pre-precipitation tank and an adjusting tank which are operated in parallel, wherein the pre-precipitation tank adopts a batch operation mode to perform standing precipitation, and the standing precipitation time is 24-36 h; the mud of preliminary sedimentation tank is discharged to the emergent pond of mud in, waste water in the preliminary sedimentation tank lets in to the equalizing basin in, the equalizing basin intercommunication chemical reaction and sedimentation system. Desulfurization waste water directly discharges to the preliminary sedimentation pond in through the pipeline, then carries out the mode of batch processing at the preliminary sedimentation pond and deposits, directly discharges the mud in the preliminary sedimentation pond into to the emergent pond of mud in, waste water discharges into to the equalizing basin through the pipeline, and the equalizing basin carries out water regulation to the waste water after the preliminary sedimentation, then directly lets in to chemical reaction and sedimentation system.
The chemical reaction and precipitation system comprises a pH adjusting tank, a reaction tank, a precipitation tank, a sludge concentration tank and a pipeline type aeration membrane, the pre-precipitation system is communicated with the pH adjusting tank, the wastewater after pre-precipitation treatment is introduced into the pH adjusting tank, and the pH adjusting tank adopts sodium hydroxide as a pH adjusting agent to adjust the pH of the desulfurization wastewater; the reaction tank is communicated with the pH adjusting tank, calcium chloride and organic sulfur are added into the reaction tank, and heavy metal ions and fluorine ions in the wastewater are removed; the sedimentation tank is a coagulation flocculation sedimentation tank and is communicated with the reaction tank, PAC and PAM are added in the sedimentation tank, the PAC and the PAM form coagulation reaction and flocculation reaction in the wastewater, and sediment is deposited at the bottom; the sedimentation tank intercommunication has sludge thickening pond and aeration membrane unit, and the sediment in the sedimentation tank fills in sludge thickening pond, and waste water in the sedimentation tank directly lets in the aeration membrane unit, adopt pipeline formula aeration membrane in the aeration membrane unit, utilize small-size air compressor machine to squeeze air into in the pipeline formula aeration membrane, the drainage is directly squeezed into to combination membrane filtration system, concentrate in the aeration membrane unit directly returns to and is discharged into in the pH adjusting tank, with the alkaline recycle of dense water itself to the pH adjusting tank in, plays the effect of adjusting pH, simultaneously along with the continuous circulation of dense water, the solute in dense water passes through reaction tank and sedimentation tank reaction again, reaches the purpose of getting rid of. Furthermore, the sedimentation tank and the aeration membrane unit are provided with an intermediate water tank which has a good buffering effect. The sludge concentration tank is communicated with a sludge treatment system, and the sludge is treated in a centralized manner through the sludge treatment system.
The combined membrane filtration system comprises an ultrafiltration unit, a reverse osmosis unit and a nanofiltration unit, wherein the water inlet end of the ultrafiltration unit is communicated with the chemical reaction and filtration system, the water outlet end of the ultrafiltration unit is communicated with the reverse osmosis unit, the concentrated water end of the reverse osmosis unit is communicated with the nanofiltration unit, the concentrated water end of the nanofiltration unit is communicated with a flue gas desulfurization water tank, and the green water section is communicated with a salt dissolving tank of a soft water workshop; introducing the wastewater subjected to the chemical reaction and precipitation system into an ultrafiltration water pump for filtration treatment, directly discharging the impurities subjected to ultrafiltration treatment into a sludge emergency pool, and directly introducing the filtered water into a reverse osmosis unit; the filtered water treated by the ultrafiltration unit enters the reverse osmosis unit for reverse osmosis treatment, the filtered water treated by the reverse osmosis unit is pumped into a reuse water tank, the subsequent water quantity for an adjusting tank is adjusted, the concentrated water treated by the reverse osmosis unit is pumped into the nanofiltration unit, the filtered water treated by the nanofiltration unit is pumped into a salt dissolving tank in a soft water workshop for dissolving salt, and the concentrated water treated by the nanofiltration unit is pumped into a flue gas desulfurization water tank for desulfurization and washing of flue gas.
And directly pumping the sludge deposited in the sludge emergency tank into a sludge concentration tank.
The sludge treatment system comprises a sludge delivery pump and a pressure filter, wherein the sludge in the sludge concentration tank is directly pumped into the pressure filter by the sludge delivery pump, the pressure filter presses the sludge to form dry sludge, the dry sludge takes calcium sulfate as a main component and is directly used as a raw material on a gypsum production line, and filtrate generated by the pressure filter flows back to the pre-sedimentation tank and is pumped into the regulating tank. The compressor adopts a diaphragm type plate frame compressor.
To sum up, the utility model has the advantages of it is following:
1. the utility model provides a problem of the unable retrieval and utilization of current desulfurization waste water back waste water, utilize the cooperation of preliminary sedimentation system, chemical reaction and sedimentation system and combination membrane filtration system, with filtrating, dense water recycle in different technology sections, realized the waste water zero release.
2. The utility model discloses carry out the filter-pressing behind the concentrated processing of mud to gypsum production line reaches real pollution-free processing, with the resourceful treatment after the desulfurization waste water treatment, reaches real zero release.
It should be understood that the above detailed description of the present invention is only for illustrative purposes and is not limited to the technical solutions described in the embodiments of the present invention. It will be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted to achieve the same technical effects; as long as the use requirement is satisfied, the utility model is within the protection scope.
Claims (8)
1. Desulfurization waste water zero release system, its characterized in that: the system comprises a pre-precipitation system, a chemical reaction and precipitation system and a combined membrane filtration system, wherein the pre-precipitation system is used for carrying out primary precipitation and water quantity regulation on the desulfurization wastewater and conveying the desulfurization wastewater to the chemical reaction and precipitation system; the chemical reaction and precipitation system carries out advanced treatment on the wastewater in a chemical reaction and precipitation mode, and then the wastewater is introduced into the combined membrane filtration system; the combined membrane filtration system utilizes a membrane process to treat wastewater, and produced water and concentrated water are respectively recycled for different process sections.
2. The desulfurization waste water zero discharge system of claim 1, characterized in that: the system of preliminary sedimentation includes parallel operation's preliminary sedimentation tank and equalizing basin, the mud of preliminary sedimentation tank is discharged to the emergent pond of mud in, waste water in the preliminary sedimentation tank lets in to the equalizing basin in, the equalizing basin intercommunication chemical reaction and sedimentation system.
3. The desulfurization waste water zero discharge system of claim 1, characterized in that: the chemical reaction and precipitation system comprises a pH adjusting tank, a reaction tank, a precipitation tank, a sludge concentration tank and a pipeline type aeration membrane, the pre-precipitation system is communicated with the pH adjusting tank, the reaction tank is communicated with the pH adjusting tank, the precipitation tank is a coagulation flocculation precipitation tank and is communicated with the reaction tank, the precipitation tank is also communicated with the sludge concentration tank and an aeration membrane unit, and the pipeline type aeration membrane is adopted in the aeration membrane unit and is communicated with a combined membrane filtering system.
4. The desulfurization waste water zero discharge system of claim 3, characterized in that: and the concentration in the aeration membrane unit is directly returned and discharged into the pH adjusting tank.
5. The desulfurization waste water zero discharge system of claim 3, characterized in that: the sedimentation tank and the aeration membrane unit are provided with an intermediate water tank which has a good buffering effect.
6. The desulfurization waste water zero discharge system of claim 3, characterized in that: the sludge concentration tank is communicated with a sludge treatment system, and the sludge is treated in a centralized manner through the sludge treatment system.
7. The desulfurization waste water zero discharge system of claim 6, characterized in that: the sludge treatment system comprises a sludge delivery pump and a pressure filter, wherein the sludge in the sludge concentration tank is directly pumped into the pressure filter by the sludge delivery pump, the pressure filter presses the sludge to form dry mud, the dry mud is directly used as a raw material on a gypsum production line, and filtrate generated by the pressure filter flows back to the pre-sedimentation tank and is pumped into the regulating tank.
8. The desulfurization waste water zero discharge system of claim 1, characterized in that: the combined membrane filtration system comprises an ultrafiltration unit, a reverse osmosis unit and a nanofiltration unit, wherein the water inlet end of the ultrafiltration unit is communicated with the chemical reaction and filtration system, the water outlet end of the ultrafiltration unit is communicated with the reverse osmosis unit, the concentrated water end of the reverse osmosis unit is communicated with the nanofiltration unit, the concentrated water end of the nanofiltration unit is communicated with a flue gas desulfurization water tank, and the water filtration end is communicated with a salt dissolving tank in a soft water plant.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020549777.4U CN212425666U (en) | 2020-04-14 | 2020-04-14 | Desulfurization waste water zero discharge system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020549777.4U CN212425666U (en) | 2020-04-14 | 2020-04-14 | Desulfurization waste water zero discharge system |
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| Publication Number | Publication Date |
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| CN212425666U true CN212425666U (en) | 2021-01-29 |
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| CN202020549777.4U Expired - Fee Related CN212425666U (en) | 2020-04-14 | 2020-04-14 | Desulfurization waste water zero discharge system |
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| Country | Link |
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- 2020-04-14 CN CN202020549777.4U patent/CN212425666U/en not_active Expired - Fee Related
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