CN111233208A - Desulfurization waste water resource recovery system - Google Patents
Desulfurization waste water resource recovery system Download PDFInfo
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- CN111233208A CN111233208A CN202010182974.1A CN202010182974A CN111233208A CN 111233208 A CN111233208 A CN 111233208A CN 202010182974 A CN202010182974 A CN 202010182974A CN 111233208 A CN111233208 A CN 111233208A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 76
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 41
- 230000023556 desulfurization Effects 0.000 title claims abstract description 41
- 238000011084 recovery Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 124
- 238000006243 chemical reaction Methods 0.000 claims abstract description 77
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 45
- 238000001728 nano-filtration Methods 0.000 claims abstract description 40
- 238000004062 sedimentation Methods 0.000 claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 claims abstract description 32
- 230000001112 coagulating effect Effects 0.000 claims abstract description 27
- 230000033228 biological regulation Effects 0.000 claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 18
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 7
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 6
- 239000010802 sludge Substances 0.000 claims abstract description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 239000001257 hydrogen Substances 0.000 claims abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- 239000012716 precipitator Substances 0.000 claims description 28
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 26
- 239000012528 membrane Substances 0.000 claims description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 13
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 11
- 239000004571 lime Substances 0.000 claims description 11
- 229920002401 polyacrylamide Polymers 0.000 claims description 11
- 238000004064 recycling Methods 0.000 claims description 7
- 239000006004 Quartz sand Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 239000006071 cream Substances 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 6
- 239000008267 milk Substances 0.000 claims description 5
- 210000004080 milk Anatomy 0.000 claims description 5
- 235000013336 milk Nutrition 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005262 decarbonization Methods 0.000 claims description 3
- 238000000746 purification Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 11
- 238000005345 coagulation Methods 0.000 description 9
- 230000015271 coagulation Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 6
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- 239000013049 sediment Substances 0.000 description 3
- 208000012826 adjustment disease Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000010979 pH adjustment Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000012629 purifying agent Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 208000017667 Chronic Disease Diseases 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
- E03B1/041—Greywater supply systems
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention relates to the technical field of water treatment, in particular to a desulfurization wastewater resource recovery system, which sequentially comprises the following components in the order of desulfurization wastewater treatment: the system comprises a raw water regulation primary settling tank, a primary coagulating sedimentation system, a secondary coagulating sedimentation system, a PH (potential of Hydrogen) callback reaction tank, a multi-media filter, a softener, a filtration water production tank, a nanofiltration device, a reverse osmosis device and a concentration device, and further comprises a plate and frame filter press, wherein the plate and frame filter press is used for cleaning sludge generated by the raw water regulation primary settling tank, the primary coagulating sedimentation system and the secondary coagulating sedimentation system. This desulfurization waste water resource recovery system carries out desulfurization waste water's processing through the mode of physical purification and chemical purification simultaneously, and purifying effect is showing, and the product water quality of water of purification is better, can be used as the retrieval and utilization, and from concentrating out sodium hypochlorite solution in the waste water, realizes resource recycle, produces direct economic benefits, changing waste into valuables.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a desulfurization wastewater resource recovery system.
Background
The desulfurization waste water generated by wet desulfurization has high suspension, high salinity, high hardness and heavy metal content, is difficult to treat and is a chronic disease of a thermal power plant all the time. The conventional treatment method adopts a triple box or an electronic flocculation process, the treatment degree is only to treat suspended matters, the treated wastewater is clear, but still contains high salt content, the treated water is difficult to recycle due to the influence of the enrichment of chloride ions on a desulfurization system, and the discharge causes great damage to the ecological environment by the salt content, heavy metals and the like in the water. In view of this, we propose a desulfurization waste water resource recovery system.
Disclosure of Invention
The invention aims to provide a desulfurization wastewater resource recovery system to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a desulfurization waste water resource recovery system, the system includes according to the order of desulfurization waste water treatment in proper order: the system comprises a raw water adjusting primary settling tank, a primary coagulating sedimentation system, a secondary coagulating sedimentation system, a PH (potential of Hydrogen) callback reaction tank, a multi-medium filter, a softener, a filtering water production tank, a nanofiltration device, a reverse osmosis device and a concentration device.
Preferably, the raw water regulation primary settling tank is used for carrying out primary settling on the desulfurization wastewater through a first precipitator;
the primary coagulating sedimentation system comprises a second precipitator, a lime milk reaction tank and a polyaluminium chloride reaction tank;
the secondary coagulating sedimentation system comprises a third precipitator, a sodium hydroxide reaction tank, a sodium carbonate reaction tank and a polyacrylamide reaction tank;
the PH callback reaction tank is used for adjusting the PH value of the desulfurization wastewater;
the multi-medium filter is a quartz sand filter;
the softener is a weak acid resin ion exchanger;
a decarbonization tower is arranged on the filtering water production tank;
the nanofiltration device adopts a two-section nanofiltration membrane, a water inlet and a concentrated water inlet of the nanofiltration device are respectively communicated with the filtration water production tank and the raw water regulation primary settling tank, and a water production port of the nanofiltration device is communicated with a nanofiltration water production tank;
the reverse osmosis device adopts a two-section reverse osmosis membrane, a water inlet of the reverse osmosis device is communicated with the nanofiltration water production tank, a water production port of the reverse osmosis device is connected with a reverse osmosis water production tank, and a concentrated water port of the reverse osmosis device is communicated with a reverse osmosis concentrated water tank;
the concentration device is a concentration reaction tank, a water inlet and a water producing port of the concentration reaction tank are respectively communicated with the reverse osmosis concentrated water tank and the nanofiltration water producing tank, and a concentrated water port of the concentration reaction tank is communicated with a sodium hypochlorite recovery tank.
Preferably, the system also comprises a plate-and-frame filter press, wherein the plate-and-frame filter press is used for cleaning sludge generated by the raw water regulation primary settling tank, the primary coagulating sedimentation system and the secondary coagulating sedimentation system, and clear liquid obtained after treatment by the plate-and-frame filter press is recycled into the raw water regulation primary settling tank.
Preferably, the first precipitator, the second precipitator and the third precipitator are all provided with mud scrapers.
Preferably, the PH callback reaction tank, the lime cream reaction tank, the polyaluminium chloride reaction tank, the sodium hydroxide reaction tank, the sodium carbonate reaction tank and the polyacrylamide reaction tank are all provided with a stirrer and a feeder.
Preferably, the washing water generated after the treatment of the multi-media filter, the regenerated water generated after the treatment of the softener and the concentrated water generated after the treatment of the nanofiltration device are all connected to the raw water regulation primary settling tank for recycling.
Preferably, the reverse osmosis water production tank pumps produced water out through a set water pump and is used for recycling.
Compared with the prior art, the invention has the beneficial effects that: this desulfurization waste water resource recovery system carries out desulfurization waste water's processing through the mode of physical purification and chemical purification simultaneously, and purifying effect is showing, and the product water quality of water of purification is better, can be used as the retrieval and utilization, and from concentrating out sodium hypochlorite solution in the waste water, realizes resource recycle, produces direct economic benefits, changing waste into valuables.
Drawings
FIG. 1 is a block diagram showing the overall structure of the present invention;
FIG. 2 is a block diagram showing the structure of a raw water adjusting primary settling tank according to the present invention;
FIG. 3 is a block diagram of a primary coagulation sedimentation system according to the present invention;
FIG. 4 is a block diagram of a two-stage coagulating sedimentation system according to the present invention;
fig. 5 is a block diagram showing the structure of a nanofiltration device according to the present invention;
FIG. 6 is a block diagram showing the construction of a reverse osmosis apparatus according to the present invention;
FIG. 7 is a block diagram showing the structure of the concentration apparatus of the present invention.
In the figure: 1. adjusting a primary settling tank by using raw water; 11. a first precipitator; 12. a plate-and-frame filter press; 2. a primary coagulating sedimentation system; 21. a second precipitator; 22. a lime milk reaction tank; 23. a polyaluminium chloride reaction tank; 3. a secondary coagulating sedimentation system; 31. a third precipitator; 32. a sodium hydroxide reaction tank; 33. a sodium carbonate reaction tank; 34. a polyacrylamide reaction tank; 4. PH is adjusted back to the reaction tank; 5. a multi-media filter; 6. a softener; 7. filtering the water producing tank; 8. a nanofiltration device; 81. a nanofiltration membrane; 82. a nanofiltration water production tank; 9. a reverse osmosis unit; 91. a reverse osmosis membrane; 92. a reverse osmosis water production tank; 93. a reverse osmosis concentrated water tank; 10. a concentration device; 101. a concentration reaction tank; 102. and a sodium hypochlorite recovery tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.
Referring to fig. 1 to 7, a technical solution provided by the present invention is:
the utility model provides a desulfurization waste water resource recovery system, includes that the system includes according to desulfurization waste water treatment's precedence in proper order: raw water regulation primary settling tank 1, one-level coagulating sedimentation system 2, second grade coagulating sedimentation system 3, PH recalling reaction tank 4, multi-media filter 5, demineralizer 6, filtration product water tank 7, nanofiltration device 8, reverse osmosis unit 9 and enrichment facility 10, it is specific: in the process of treating the desulfurization wastewater, the raw water regulation primary settling tank 1 is used for carrying out primary settling on the desulfurization wastewater through the arranged first precipitator 11, and the wastewater after the primary settling is introduced into the primary coagulation sedimentation system 2;
the primary coagulating sedimentation system 2 comprises a second precipitator 21, a lime cream reaction tank 22 and a polyaluminium chloride reaction tank 23, the second precipitator 21 carries out secondary sedimentation on the desulfurization wastewater, the desulfurization wastewater passes through lime cream, the cost of the lime cream is low, the PH of the wastewater in the reaction tank 22 is improved, the hardness of the wastewater is reduced, the polyaluminium chloride reaction tank 23 utilizes the good chemical property of the polyaluminium chloride as an inorganic polymer coagulant, the wastewater is convenient to purify, and the purified wastewater is introduced into the secondary coagulating sedimentation system 3;
the second-stage coagulation sedimentation system 3 comprises a third precipitator 31, a sodium hydroxide reaction tank 32, a sodium carbonate reaction tank 33 and a polyacrylamide reaction tank 34, the third precipitator 31 carries out third sedimentation on the desulfurization wastewater, a sodium hydroxide solution stored in the sodium hydroxide reaction tank 32 has strong basicity and is used as a pH regulator to regulate the pH value again so as to reduce the hardness of the water, the sodium carbonate stored in the sodium carbonate reaction tank 33 provides carbonate which further generates sediment with calcium, magnesium and the like in the wastewater, fine particles in the sediment are better subjected to mud-water separation by utilizing the flocculation effect in the polyacrylamide reaction tank 34 so as to play a role in purifying water, and the purified wastewater is introduced into the PH adjustment reaction tank 4;
acid liquor is poured into the PH adjustment reaction tank 4 to adjust the PH value of the desulfurization wastewater, the PH value is controlled to be 6-9, and the adjusted wastewater is introduced into a multi-media filter 5;
the multi-medium filter 5 is a quartz sand filter, the quartz sand filter can filter the wastewater with higher turbidity through granular or non-granular quartz sand with a certain thickness, effectively entraps and removes suspended matters, organic matters, colloidal particles, microorganisms, chlorine, odor, partial heavy metal ions and the like in the water, finally achieves the effects of reducing the water turbidity and purifying the water quality, and is introduced into the softener 6 to soften the wastewater;
the softener 6 is a weak acid resin ion exchanger which can adsorb other free cations in the wastewater, and the exchanged wastewater is introduced into the filtering water production tank 7;
a decarbonization tower is arranged on the filtering water production tank 7 and is used for decarbonizing the wastewater, and the decarbonized wastewater is introduced into a nanofiltration device 8;
the nanofiltration device 8 adopts a two-section nanofiltration membrane 81, the nanofiltration membrane 81 is used for intercepting inorganic salts in wastewater, a water inlet and a concentrated water inlet of the nanofiltration device 8 are respectively communicated with the filtration water production tank 7 and the raw water regulation primary settling tank 1, a water production port of the nanofiltration device 8 is communicated with a nanofiltration water production tank 82, and the nanofiltration water production tank 82 leads the intercepted wastewater into the reverse osmosis device 9 through the nanofiltration membrane 81;
the reverse osmosis device 9 adopts a two-section reverse osmosis membrane 91, the reverse osmosis membrane 91 can separate substances from water according to the fact that other substances cannot permeate a semipermeable membrane under the action of the osmotic pressure of a wastewater solution, so that a good purification effect is achieved, the membrane aperture of the reverse osmosis membrane 91 is very small, dissolved salts, colloids, microorganisms, organic matters and the like in the wastewater can be effectively removed, a water inlet of the reverse osmosis device 9 is communicated with the nanofiltration water producing tank 82, a water producing port of the reverse osmosis device 9 is connected with a reverse osmosis water producing tank 92, a concentrated water port of the reverse osmosis device 9 is communicated with a reverse osmosis concentrated water tank 93, and the concentrated water obtained after separation is introduced into the concentration device 10 by the reverse osmosis concentrated water tank 93;
the concentration device 10 is a concentration reaction tank 101, the concentration reaction tank 101 stores a concentrated solution, the salt content of the concentrated solution is 120000-.
In this embodiment, still include plate and frame filter press 12, plate and frame filter press 12 is used for clearing up the raw water and adjusts the mud that primary settling tank 1, one-level coagulating sedimentation system 2 and second grade coagulating sedimentation system 3 produced, and the clear liquid that obtains after plate and frame filter press 12 handles is retrieved into raw water and adjusts primary settling tank 1 in, is convenient for handle the mud after the sediment, and the clear liquid that draws in the mud still has certain harm to the environment, consequently retrieves and purifies in raw water adjusts primary settling tank 1.
Further, all install the mud scraper on first precipitator 11, second precipitator 21 and the third precipitator 31, be convenient for clear up it.
In addition, the PH callback reaction tank 4, the lime cream reaction tank 22, the polyaluminium chloride reaction tank 23, the sodium hydroxide reaction tank 32, the sodium carbonate reaction tank 33 and the polyacrylamide reaction tank 34 are respectively provided with a stirrer and a feeder, the feeder is used for feeding various purifying agents, the stirrer is beneficial to dissolving raw materials in wastewater, and can accelerate the reaction, so that the reaction is more thorough.
It is worth to be noted that the washing water produced after the treatment of the multi-media filter 5, the regenerated water produced after the treatment of the softener 6 and the concentrated water produced after the treatment of the nanofiltration device 8 are all connected to the raw water regulation primary settling tank 1 for recycling, so that the generated aqueous solution can be repeatedly purified, and the purification efficiency is improved.
In addition, the reverse osmosis water production tank 92 pumps the produced water through the arranged water pump and is used for recycling, and the water accumulated in the reverse osmosis water production tank 92 has better purity and can be used for diluting and dissolving the added purifying agent solution after being recycled.
Specifically, when the raw water regulation primary settling tank 1 is used, the plane load of the first precipitator 11 is 0.5-0.8m3The residence time of the wastewater is 16 to 18 hours per square meter per hour;
when the primary coagulating sedimentation system is used, the plane load of the second precipitator 21 is 0.5-0.8m3Per square meter per hour, the retention time of the wastewater is 16-18 hours, the retention time of the wastewater in the lime milk reaction tank 22 is 15-20min, the pH of the wastewater is controlled to be 8-9, the retention time of the wastewater in the polyaluminium chloride reaction tank 23 is 30-45min, and the polyaluminium chloride is added according to 30-50 ppm;
when the secondary coagulating sedimentation system 3 is used, the retention time of the wastewater in the sodium hydroxide reaction tank 32 is 15-20min, the pH of the wastewater is controlled to be 9-10, the retention time of the wastewater in the sodium carbonate reaction tank 33 is 15-20min, the retention time of the wastewater in the polyacrylamide reaction tank 34 is 30-45min, the polyacrylamide is added according to 3-5ppm, and a heavy metal catching agent is added into the sodium carbonate reaction tank 33 while adding sodium carbonate for flocculating heavy metal ions in the wastewater.
When the PH readjustment reaction tank 4 is used, the PH of the wastewater is controlled to be 6-9, and the retention time of the wastewater in the PH readjustment reaction tank 4 is 15-20 min;
when the multi-medium filter 5 is used, the filtering flow rate of the quartz sand filter is controlled to be 8-12m/h, and backwashing, forward washing and gas washing are arranged;
when the softener 6 is used, the exchange flow rate of the weak acid resin ion exchanger is controlled to be 20-30m/h, and the filling amount of the weak acid resin is designed according to the hardness of 200mg/L in the wastewater;
when the filtering water production tank 7 is used, the filtering flow rate of the decarbonizing tower is 50-60m/h, the decarbonizing tower is connected with a fan, and the air volume of the fan is 40Nm according to the air-water ratio3Designing the solution,/h;
when the nanofiltration device 8 is used, the recovery rate is set between 70 and 80 percent;
when the reverse osmosis device 9 is used, the recovery rate is set between 60 and 70 percent.
When the desulfurization wastewater resource recovery system of the embodiment is used, the system sequentially introduces desulfurization wastewater into the raw water regulation primary settling tank 1, the primary coagulation sedimentation system 2, the secondary coagulation sedimentation system 3, the PH readjustment reaction tank 4, the multi-media filter 5, the softener 6, the filtration water production tank 7, the nanofiltration device 8, the reverse osmosis device 9 and the concentration device 10 according to the order of desulfurization wastewater treatment, wherein the first precipitator 11 arranged in the raw water regulation primary settling tank 1, the second precipitator 21 arranged in the primary coagulation sedimentation system 2 and the third precipitator 31 arranged in the secondary coagulation sedimentation system 3 are used for physical purification for removing sludge with large molecular weight in wastewater, the lime milk reaction tank 22 and the polyaluminium chloride reaction tank 23 arranged in the primary coagulation sedimentation system 2, and the sodium hydroxide reaction tank 32 and the polyaluminium chloride reaction tank 23 arranged in the secondary coagulation sedimentation system 3, The sodium carbonate reaction tank 33 and the polyacrylamide reaction tank 34 are used for chemical purification, metal ions in alkali solution and wastewater are utilized to generate precipitates for filtration, meanwhile, the wastewater is further purified through the PH callback reaction tank 4, the multi-media filter 5, the softener 6 and the filtration water production tank 7, the treated wastewater is finally purified and recycled through the nanofiltration device 8, the reverse osmosis device 9 and the concentration device 10, the nanofiltration device 8 intercepts inorganic salts in the wastewater through the arranged nanofiltration membrane 81, the reverse osmosis device 9 separates other substances in the wastewater from water under the osmosis action of the arranged reverse osmosis membrane 91, thereby achieving good purification effect, avoiding ecological damage to the external discharge of desulfurization wastewater, and the concentration device 10 concentrates sodium hypochlorite solution from the wastewater through the sodium hypochlorite recovery tank 102, realizes resource recycling, generates direct economic benefit, has obvious purification effect of the whole desulfurization wastewater treatment system, can recycle the wastewater resource, changes waste into valuable, and is convenient for popularization and promotion.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a desulfurization waste water resource recovery system which characterized in that: the system comprises the following components in sequence according to the order of desulfurization wastewater treatment: the system comprises a raw water regulation primary settling tank (1), a primary coagulating sedimentation system (2), a secondary coagulating sedimentation system (3), a PH (potential of Hydrogen) callback reaction tank (4), a multi-medium filter (5), a softener (6), a filtering water production tank (7), a nanofiltration device (8), a reverse osmosis device (9) and a concentration device (10).
2. The desulfurization wastewater resource recovery system according to claim 1, characterized in that:
the raw water regulation primary settling tank (1) is used for carrying out primary settling on the desulfurization wastewater through a first precipitator (11);
the primary coagulating sedimentation system (2) comprises a second precipitator (21), a lime milk reaction tank (22) and a polyaluminium chloride reaction tank (23);
the secondary coagulating sedimentation system (3) comprises a third precipitator (31), a sodium hydroxide reaction tank (32), a sodium carbonate reaction tank (33) and a polyacrylamide reaction tank (34);
the PH callback reaction tank (4) is used for adjusting the PH value of the desulfurization wastewater;
the multi-medium filter (5) is a quartz sand filter;
the softener (6) is a weak acid resin ion exchanger;
a decarbonization tower is arranged on the filtering water production tank (7);
the nanofiltration device (8) adopts a two-section nanofiltration membrane (81), a water inlet and a concentrated water inlet of the nanofiltration device (8) are respectively communicated with the filtration water production tank (7) and the raw water regulation primary settling tank (1), and a water production port of the nanofiltration device (8) is communicated with a nanofiltration water production tank (82);
the reverse osmosis device (9) adopts a two-section reverse osmosis membrane (91), a water inlet of the reverse osmosis device (9) is communicated with the nanofiltration water production tank (82), a water production port of the reverse osmosis device (9) is connected with a reverse osmosis water production tank (92), and a concentrated water port of the reverse osmosis device (9) is communicated with a reverse osmosis concentrated water tank (93);
the concentration device (10) is a concentration reaction tank (101), a water inlet and a water producing port of the concentration reaction tank (101) are respectively communicated with the reverse osmosis concentrated water tank (93) and the nanofiltration water producing tank (82), and a concentrated water port of the concentration reaction tank (101) is communicated with a sodium hypochlorite recovery tank (102).
3. The desulfurization wastewater resource recovery system according to claim 1, characterized in that: the system is characterized by further comprising a plate and frame filter press (12), wherein the plate and frame filter press (12) is used for cleaning sludge generated by the raw water regulation primary settling tank (1), the primary coagulating sedimentation system (2) and the secondary coagulating sedimentation system (3), and clear liquid obtained after treatment of the plate and frame filter press (12) is recycled into the raw water regulation primary settling tank (1).
4. The desulfurization wastewater resource recovery system according to claim 2, characterized in that: and mud scrapers are arranged on the first precipitator (11), the second precipitator (21) and the third precipitator (31).
5. The desulfurization wastewater resource recovery system according to claim 2, characterized in that: and the PH callback reaction tank (4), the lime cream reaction tank (22), the polyaluminium chloride reaction tank (23), the sodium hydroxide reaction tank (32), the sodium carbonate reaction tank (33) and the polyacrylamide reaction tank (34) are respectively provided with a stirrer and a feeder.
6. The desulfurization wastewater resource recovery system according to claim 2, characterized in that: and the washing water generated after the treatment of the multi-medium filter (5), the regenerated water generated after the treatment of the softener (6) and the concentrated water generated after the treatment of the nanofiltration device (8) are all connected into the raw water regulation primary settling tank (1) for recycling.
7. The desulfurization wastewater resource recovery system according to claim 2, characterized in that: the reverse osmosis water production tank (92) pumps produced water out through a set water pump and is used for recycling.
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