CN112520899A - High-salinity wastewater precipitation desalination recycling process - Google Patents
High-salinity wastewater precipitation desalination recycling process Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
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- C02F2001/007—Processes including a sedimentation step
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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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
- C02F5/02—Softening water by precipitation of the hardness
Abstract
The invention discloses a high-salinity wastewater precipitation desalting cyclic utilization process, which comprises the combination of large-area deep standing precipitation and small-volume dynamic crystallization desalting; the large-area deep standing precipitation is used as a water supply point of an industrial water supply pipeline with low water quality requirement and a small-volume dynamic crystallization desalting water supply point. The high-salinity wastewater precipitation desalting cyclic utilization process disclosed by the invention combines large-area deep standing precipitation and small-volume dynamic crystallization desalting; the large-area deep standing precipitation is used as a main circulation line, the small-volume dynamic crystallization desalting water is used as a fine circulation line, the desalting cost is low, and the desalting efficiency is high.
Description
Technical Field
The invention relates to a high-salinity wastewater treatment process, in particular to a high-salinity wastewater precipitation desalination recycling process, and belongs to the technical field of high-salinity wastewater treatment processes.
Background
At present, the harmfulness of industrial wastewater discharge is very large for wastewater discharge, and if the untreated wastewater reaches the standard and is discharged into a river channel, a pond or seeped into the ground, the untreated wastewater not only harms the environment, but also pollutes drinking water sources; in the prior art, mature processes and equipment of water treatment processes such as RO reverse osmosis, EDI electric desalting method and the like can produce high-quality and high-efficiency production water, but the water yield of the water production process of the processes is about 75 percent, namely: in the process of producing high-quality water, other impurity components in the water are separated by a membrane, so that the impurity components are concentrated in 25% concentrated salt water; the strong brine is usually difficult to reuse, so the strong brine has to be discharged to a water body or a deep well; the harmfulness of the concentrated water treatment mode is gradually shown, such as the problems of land salinization, water organism reduction and the like are caused; for this reason, chinese patent application No.: 201910392949.3 discloses a high-salinity wastewater discharge treatment system, which comprises a wastewater collection tank, a regulation treatment tank, a multi-media filter, an electrodialysis treatment device, a coagulating sedimentation unit, an evaporative crystallization unit, a nanofiltration unit and a reverse osmosis desalination device, and has complex structure and high desalination cost.
Disclosure of Invention
In order to solve the problems, the invention provides a high-salinity wastewater precipitation desalination recycling process which is simple and has high desalination efficiency.
The high-salinity wastewater precipitation desalting cyclic utilization process comprises the steps of combining large-area deep standing precipitation and small-volume dynamic crystallization desalting; the large-area deep standing sediment is used as a water supply point of an industrial water supply pipeline with low water quality requirement and a small-volume dynamic crystallization desalting water supply point, and during desalting, the large-area deep standing sediment is used for preliminary desalting and impurity removal, and then the small-volume dynamic crystallization desalting is used for post-stage desalting; when desalting, forming water body into crystal nucleus and continuously forming large crystal; finally, carrying out precipitation and discharge; the crystal nucleus can continuously form salt substances in the water body into large crystals through electric stirring and air floatation.
Further, the process specifically comprises the following steps:
firstly, establishing a coarse waste precipitation system of high-salinity wastewater; the first treatment system comprises a high-salinity wastewater collecting tank, the high-salinity wastewater collecting tank is connected with a high-water-quality water system drainage pipeline, a medium-water-quality water system drainage pipeline and a low-water-quality water system drainage pipeline, the high-salinity wastewater collecting tank is connected to a stirring tank, and a pneumatic stirring or stirring paddle stirring mechanism is arranged at the stirring tank; a dosing mechanism for adding PAC, PAM and lime is arranged at the stirring tank; the stirring tank is of a V-shaped structure; the output end of the stirring pool is connected to the standing sedimentation pool; the upper part of the standing sedimentation tank is connected to an inclined tube sedimentation tank; the upper part of the inclined tube sedimentation tank is connected to the V-shaped filter tank; the output end of the V-shaped filter tank is connected to a primary clean water tank;
secondly, establishing a salt substance precipitation system of the high-salinity wastewater; the output end of the primary clean water tank is connected to a distribution tank, and a clean water pipe, a water return pipe and a PH transmitter are arranged on the distribution tank; the output end of the distribution tank is connected to a stirring crystallization separator, and an alkali material feeding mechanism, a flocculating agent feeding mechanism and a PH transmitter are arranged at the stirring crystallization separator; the overflow end of the stirring crystallization separator is connected to a secondary clean water tank; the secondary clean water tank is connected to the water return tank and the recycling tank; an acid material feeding mechanism and a PH meter are arranged at the positions of the water return tank and the recycling tank; the water return tank is connected to a water return pipe of the primary clean water tank;
thirdly, desalting for recycling; it is supplied water by outside clear water pipeline for high water quality system, it is supplied water by retrieval and utilization pond for well water quality system, low water quality system for water is connected to the transition pond, the end connection primary clear water pond and secondary clear water pond are intake to the transition pond.
Further, the process of the crude waste precipitation system is as follows:
the high-salinity wastewater collecting tank collects the drainage of a high-water-quality water system, the drainage of a medium-water-quality water system and the drainage of a low-water-quality water system; collecting and mixing the waste water by a high-salinity waste water collecting tank, quantitatively feeding the waste water to a stirring tank after the water level reaches a certain water level, quantitatively adding PAC, PAM and lime, and starting stirring; after stirring, conveying the mixed water body to a standing sedimentation tank to finish primary standing; sending the supernatant after the primary standing to an inclined tube sedimentation tank; supernatant after the inclined tube sedimentation tank is kept stand and sedimentated is sent to a V-shaped filter tank; sending supernatant liquid precipitated by the V-shaped filter tank to a primary clean water tank, and performing large-volume standing precipitation by adding a flocculating agent and a plurality of sedimentation tanks; the water body of the transition pool introduced by the primary clean water pool basically meets the first ten to twenty circulations; when the cycle times reach a threshold value, supplementing reuse water to the transition pool through a secondary clean water pool for neutralization; thereby the water quality requirement of the circulation is satisfied again; the high-salinity wastewater collecting tank supplies water to a large-area deep standing sedimentation system in a discrete manner, and the water quantity of the primary clear water tank needs to meet the continuous water supply requirements of a low-water-quality water system and a small-volume dynamic crystallization desalting system;
further, the salt substance precipitation system of the high-salinity wastewater comprises the following processes:
sending salt-containing clear water to a water distribution tank through a primary clear water tank, adding clear water and return water into the water distribution tank to enable the pH value of the clear water to reach a preset value, sending the clear water to a stirring crystallization separator, then adding sodium hydroxide through an alkali material adding mechanism to enable the pH value of the sodium hydroxide to reach 9.5-10.0, removing calcium ions in raw water, enabling bicarbonate radicals in the raw water to be changed into carbonate radicals, enabling the carbonate radicals to react with the calcium ions to generate calcium carbonate crystals, enabling the calcium carbonate crystals to grow continuously through air-flotation crystal nuclei, and finally completing precipitation separation; then, the pH value of the water reaches more than 11.0 through an alkaline material adding mechanism, a flocculating agent is added to react magnesium ions in the water with hydroxyl to generate magnesium oxide precipitate, when the precipitated magnesium oxide is floated and reacts with silicon and magnesium hydroxide in the water to flocculate, the magnesium oxide precipitate is finally precipitated, and the precipitate is discharged to a crystallization separator; the water body which completes the desalination enters a secondary clean water tank; the secondary clean water tank is connected to the reuse tank to directly supply water for the medium water quality water system, and the secondary clean water tank is connected to the return tank to be used as the neutralizing water for the primary clean water tank and also used as the water for regulating the water quality of the transition tank.
Further, the stirring crystallization separator comprises a conical outer cylinder, and a grid-shaped inner rib is welded between the outer cylinder and the inner bucket; a plurality of layers of filter screens are fixed on the top surfaces of the inner ribs of the outer barrel and the inner bucket, and filter materials are filled on the top surfaces of the filter screens; an overflow pipe is arranged at the top of the outer barrel; the bottom of the outer barrel is provided with a crystal tube; the inner bucket is provided with a distribution pool connected with the water inlet pipe and a return pipe connected with the crystal discharge pipe; a reflux pump is arranged on the reflux pipe; an inflation pipe is arranged on the inner bucket; the inflation pipe is higher than the top surface of the inner bucket; and an electric stirring paddle is arranged on the inner side of the inner hopper.
Compared with the prior art, the high-salinity wastewater precipitation desalting recycling process disclosed by the invention combines large-area deep standing precipitation and small-volume dynamic crystallization desalting; the large-area deep standing precipitation is used as a main circulation line, the small-volume dynamic crystallization desalting water is used as a fine circulation line, the desalting cost is low, and the desalting efficiency is high.
Drawings
Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present invention.
Fig. 2 is a schematic view of the overall structure of embodiment 2 of the present invention.
FIG. 3 is a schematic diagram of the configuration of the stirred crystallization separator of the present invention.
Detailed Description
Example 1:
the high-salinity wastewater precipitation desalination recycling process shown in figure 1 comprises the combination of large-area deep standing precipitation and small-volume dynamic crystallization desalination; the large-area deep standing sediment is used as a water supply point of an industrial water supply pipeline with low water quality requirement and a small-volume dynamic crystallization desalting water supply point, and during desalting, the large-area deep standing sediment is used for preliminary desalting and impurity removal, and then the small-volume dynamic crystallization desalting is used for post-stage desalting; when desalting, forming water body into crystal nucleus and continuously forming large crystal; finally, carrying out precipitation and discharge; the crystal nucleus can continuously form salt substances in the water body into large crystals through electric stirring and air floatation.
Example 2:
the high-salinity wastewater precipitation desalination recycling process shown in fig. 2 specifically comprises the following steps:
firstly, establishing a coarse waste precipitation system of high-salinity wastewater; the first treatment system comprises a high-salinity wastewater collecting tank, the high-salinity wastewater collecting tank is connected with a high-water-quality water system drainage pipeline, a medium-water-quality water system drainage pipeline and a low-water-quality water system drainage pipeline, the high-salinity wastewater collecting tank is connected to a stirring tank, and a pneumatic stirring or stirring paddle stirring mechanism is arranged at the stirring tank; a dosing mechanism for adding PAC, PAM and lime is arranged at the stirring tank; the stirring tank is of a V-shaped structure; the output end of the stirring pool is connected to the standing sedimentation pool; the upper part of the standing sedimentation tank is connected to an inclined tube sedimentation tank; the upper part of the inclined tube sedimentation tank is connected to the V-shaped filter tank; the output end of the V-shaped filter tank is connected to a primary clean water tank;
secondly, establishing a salt substance precipitation system of the high-salinity wastewater; the output end of the primary clean water tank is connected to a distribution tank, and a clean water pipe, a water return pipe and a PH transmitter are arranged on the distribution tank; the output end of the distribution tank is connected to a stirring crystallization separator, and an alkali material feeding mechanism, a flocculating agent feeding mechanism and a PH transmitter are arranged at the stirring crystallization separator; the overflow end of the stirring crystallization separator is connected to a secondary clean water tank; the secondary clean water tank is connected to the water return tank and the recycling tank; an acid material feeding mechanism and a PH meter are arranged at the positions of the water return tank and the recycling tank; the water return tank is connected to a water return pipe of the primary clean water tank;
thirdly, desalting for recycling; it is supplied water by outside clear water pipeline for high water quality system, it is supplied water by retrieval and utilization pond for well water quality system, low water quality system for water is connected to the transition pond, the end connection primary clear water pond and secondary clear water pond are intake to the transition pond.
Wherein, the process of the crude waste precipitation system is as follows:
the high-salinity wastewater collecting tank collects the drainage of a high-water-quality water system, the drainage of a medium-water-quality water system and the drainage of a low-water-quality water system; collecting and mixing the waste water by a high-salinity waste water collecting tank, quantitatively feeding the waste water to a stirring tank after the water level reaches a certain water level, quantitatively adding PAC, PAM and lime, and starting stirring; after stirring, conveying the mixed water body to a standing sedimentation tank to finish primary standing; sending the supernatant after the primary standing to an inclined tube sedimentation tank; supernatant after the inclined tube sedimentation tank is kept stand and sedimentated is sent to a V-shaped filter tank; sending supernatant liquid precipitated by the V-shaped filter tank to a primary clean water tank, and performing large-volume standing precipitation by adding a flocculating agent and a plurality of sedimentation tanks; the water body of the transition pool introduced by the primary clean water pool basically meets the first ten to twenty circulations; when the cycle times reach a threshold value, supplementing reuse water to the transition pool through a secondary clean water pool for neutralization; thereby the water quality requirement of the circulation is satisfied again; the high-salinity wastewater collecting tank supplies water to a large-area deep standing sedimentation system in a discrete manner, and the water quantity of the primary clear water tank needs to meet the continuous water supply requirements of a low-water-quality water system and a small-volume dynamic crystallization desalting system;
wherein, the process of the salt substance precipitation system of the high-salinity wastewater is as follows:
sending salt-containing clear water to a water distribution tank through a primary clear water tank, adding clear water and return water into the water distribution tank to enable the pH value of the clear water to reach a preset value, sending the clear water to a stirring crystallization separator, then adding sodium hydroxide through an alkali material adding mechanism to enable the pH value of the sodium hydroxide to reach 9.5-10.0, removing calcium ions in raw water, enabling bicarbonate radicals in the raw water to be changed into carbonate radicals, enabling the carbonate radicals to react with the calcium ions to generate calcium carbonate crystals, enabling the calcium carbonate crystals to grow continuously through air-flotation crystal nuclei, and finally completing precipitation separation; then, the pH value of the water reaches more than 11.0 through an alkaline material adding mechanism, a flocculating agent is added to react magnesium ions in the water with hydroxyl to generate magnesium oxide precipitate, when the precipitated magnesium oxide is floated and reacts with silicon and magnesium hydroxide in the water to flocculate, the magnesium oxide precipitate is finally precipitated, and the precipitate is discharged to a crystallization separator; the water body which completes the desalination enters a secondary clean water tank; the secondary clean water tank is connected to the reuse tank to directly supply water for the medium water quality water system, and the secondary clean water tank is connected to the return tank to be used as the neutralizing water for the primary clean water tank and also used as the water for regulating the water quality of the transition tank.
As shown in fig. 3, the stirring crystallization separator comprises a conical outer cylinder 1, and a grid-shaped inner rib 3 is welded between the outer cylinder 1 and an inner bucket 2; a plurality of layers of filter screens 4 are fixed on the top surfaces of the inner ribs of the outer barrel 1 and the inner bucket 2, and filter materials are filled on the top surfaces of the filter screens 4; an overflow pipe 5 is arranged at the top of the outer barrel 1; the bottom of the outer barrel 1 is provided with a crystal tube 6; the inner bucket 2 is provided with a distribution pool connected with a water inlet pipe and a return pipe 7 connected with a crystal discharge pipe; a reflux pump 8 is arranged on the reflux pipe 7; the inner bucket 2 is provided with an inflation tube 9; the gas-filled tube 9 is higher than the top surface of the inner bucket 2; the inner side of the inner bucket 2 is provided with an electric stirring paddle 10.
The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.
Claims (5)
1. A high-salinity wastewater precipitation desalination recycling process is characterized in that: the process comprises the combination of large-area deep standing precipitation and small-volume dynamic crystallization desalting; the large-area deep standing precipitation is used as a water supply point of an industrial water supply pipeline with low water quality requirement and a small-volume dynamic crystallization desalting water supply point.
2. The high-salinity wastewater precipitation desalination recycling process according to claim 1, characterized in that: the process comprises the following specific steps:
firstly, establishing a coarse waste precipitation system of high-salinity wastewater; the first treatment system comprises a high-salinity wastewater collecting tank, the high-salinity wastewater collecting tank is connected with a high-water-quality water system drainage pipeline, a medium-water-quality water system drainage pipeline and a low-water-quality water system drainage pipeline, the high-salinity wastewater collecting tank is connected to a stirring tank, and a pneumatic stirring or stirring paddle stirring mechanism is arranged at the stirring tank; a dosing mechanism for adding PAC, PAM and lime is arranged at the stirring tank; the stirring tank is of a V-shaped structure; the output end of the stirring pool is connected to the standing sedimentation pool; the upper part of the standing sedimentation tank is connected to an inclined tube sedimentation tank; the upper part of the inclined tube sedimentation tank is connected to the V-shaped filter tank; the output end of the V-shaped filter tank is connected to a primary clean water tank;
secondly, establishing a salt substance precipitation system of the high-salinity wastewater; the output end of the primary clean water tank is connected to a distribution tank, and a clean water pipe, a water return pipe and a PH transmitter are arranged on the distribution tank; the output end of the distribution tank is connected to a stirring crystallization separator, and an alkali material feeding mechanism, a flocculating agent feeding mechanism and a PH transmitter are arranged at the stirring crystallization separator; the overflow end of the stirring crystallization separator is connected to a secondary clean water tank; the secondary clean water tank is connected to the water return tank and the recycling tank; an acid material feeding mechanism and a PH meter are arranged at the positions of the water return tank and the recycling tank; the water return tank is connected to a water return pipe of the primary clean water tank;
thirdly, desalting for recycling; it is supplied water by outside clear water pipeline for high water quality system, it is supplied water by retrieval and utilization pond for well water quality system, low water quality system for water is connected to the transition pond, the end connection primary clear water pond and secondary clear water pond are intake to the transition pond.
3. The high-salinity wastewater precipitation desalination recycling process according to claim 1, characterized in that: the process of the crude waste precipitation system is as follows:
the high-salinity wastewater collecting tank collects the drainage of a high-water-quality water system, the drainage of a medium-water-quality water system and the drainage of a low-water-quality water system; collecting and mixing the waste water by a high-salinity waste water collecting tank, quantitatively feeding the waste water to a stirring tank after the water level reaches a certain water level, quantitatively adding PAC, PAM and lime, and starting stirring; after stirring, conveying the mixed water body to a standing sedimentation tank to finish primary standing; sending the supernatant after the primary standing to an inclined tube sedimentation tank; supernatant after the inclined tube sedimentation tank is kept stand and sedimentated is sent to a V-shaped filter tank; sending supernatant liquid precipitated by the V-shaped filter tank to a primary clean water tank, and performing large-volume standing precipitation by adding a flocculating agent and a plurality of sedimentation tanks; the water body of the transition pool introduced by the primary clean water pool basically meets the first ten to twenty circulations; when the cycle times reach a threshold value, supplementing reuse water to the transition pool through a secondary clean water pool for neutralization; thereby the water quality requirement of the circulation is satisfied again; the high-salinity wastewater collecting tank supplies water to the large-area deep standing sedimentation system in a discrete mode, and the water quantity of the primary clean water tank needs to meet the continuous water supply requirements of a low-water-quality water system and a small-volume dynamic crystallization desalting system.
4. The high-salinity wastewater precipitation desalination recycling process according to claim 1, characterized in that: the process of the salt substance precipitation system of the high-salinity wastewater comprises the following steps:
sending salt-containing clear water to a water distribution tank through a primary clear water tank, adding clear water and return water into the water distribution tank to enable the pH value of the clear water to reach a preset value, sending the clear water to a stirring crystallization separator, then adding sodium hydroxide through an alkali material adding mechanism to enable the pH value of the sodium hydroxide to reach 9.5-10.0, removing calcium ions in raw water, enabling bicarbonate radicals in the raw water to be changed into carbonate radicals, enabling the carbonate radicals to react with the calcium ions to generate calcium carbonate crystals, enabling the calcium carbonate crystals to grow continuously through air-flotation crystal nuclei, and finally completing precipitation separation; then, the pH value of the water reaches more than 11.0 through an alkaline material adding mechanism, a flocculating agent is added to react magnesium ions in the water with hydroxyl to generate magnesium oxide precipitate, when the precipitated magnesium oxide is floated and reacts with silicon and magnesium hydroxide in the water to flocculate, the magnesium oxide precipitate is finally precipitated, and the precipitate is discharged to a crystallization separator; the water body which completes the desalination enters a secondary clean water tank; the secondary clean water tank is connected to the reuse tank to directly supply water for the medium water quality water system, and the secondary clean water tank is connected to the return tank to be used as the neutralizing water for the primary clean water tank and also used as the water for regulating the water quality of the transition tank.
5. The high-salinity wastewater precipitation desalination recycling process according to claim 1, characterized in that: the stirring crystallization separator comprises a conical outer cylinder, and a grid-shaped inner rib is welded between the outer cylinder and the inner bucket; a plurality of layers of filter screens are fixed on the top surfaces of the inner ribs of the outer barrel and the inner bucket, and filter materials are filled on the top surfaces of the filter screens; an overflow pipe is arranged at the top of the outer barrel; the bottom of the outer barrel is provided with a crystal tube; the inner bucket is provided with a distribution pool connected with the water inlet pipe and a return pipe connected with the crystal discharge pipe; a reflux pump is arranged on the reflux pipe; an inflation pipe is arranged on the inner bucket; the inflation pipe is higher than the top surface of the inner bucket; and an electric stirring paddle is arranged on the inner side of the inner hopper.
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