CN110818168A - Smoke washing wastewater zero-discharge technical treatment system and method - Google Patents
Smoke washing wastewater zero-discharge technical treatment system and method Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 113
- 238000005406 washing Methods 0.000 title claims abstract description 57
- 239000000779 smoke Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 80
- 238000001471 micro-filtration Methods 0.000 claims abstract description 70
- 239000012528 membrane Substances 0.000 claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000004062 sedimentation Methods 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 9
- 239000000498 cooling water Substances 0.000 claims abstract description 8
- 239000010802 sludge Substances 0.000 claims description 31
- 238000001556 precipitation Methods 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 239000000701 coagulant Substances 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 13
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000002425 crystallisation Methods 0.000 claims description 7
- 230000008025 crystallization Effects 0.000 claims description 7
- 239000003814 drug Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 5
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- 238000005273 aeration Methods 0.000 claims description 4
- 239000002738 chelating agent Substances 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 239000011777 magnesium Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 238000010612 desalination reaction Methods 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- 208000028659 discharge Diseases 0.000 claims 9
- 230000003750 conditioning effect Effects 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 description 12
- 231100000719 pollutant Toxicity 0.000 description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 6
- 238000001223 reverse osmosis Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
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- 230000016615 flocculation Effects 0.000 description 3
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- 238000004056 waste incineration Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- GFEGEDUIIYDMOX-YHARCJFQSA-N Thiamine disulfide Chemical compound C=1N=C(C)N=C(N)C=1CN(C=O)C(/C)=C(CCO)/SSC(\CCO)=C(/C)N(C=O)CC1=CN=C(C)N=C1N GFEGEDUIIYDMOX-YHARCJFQSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
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- 230000009897 systematic effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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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
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- 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
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- C02F1/5281—Installations for water purification using chemical agents
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- 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
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- 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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/14—NH3-N
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- C02F2209/16—Total nitrogen (tkN-N)
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a smoke-washing wastewater zero-discharge technical treatment system and a method, which comprises the following steps: the system comprises a heat exchanger, a waste water adjusting tank, a first reaction tank, a first sedimentation tank, a second reaction tank, a microfiltration concentration tank, a tubular microfiltration device, a pH neutralization tank, a microfiltration water producing tank, a high-pressure membrane device, a high-pressure membrane water producing tank, an RO device and a reuse water tank which are sequentially connected with smoke washing waste water; wherein the high-pressure membrane device is additionally provided with a pipeline connected with an evaporator, and the evaporative cooling water flows back to a reuse pool for reuse; a circulating pipeline is additionally arranged between the microfiltration concentration tank and the tubular microfiltration device through a circulating pump, wastewater in the microfiltration concentration tank is conveyed to the tubular microfiltration device through the circulating pump for solid-liquid separation, the wastewater circularly flows in the tubular microfiltration device, water produced by the filter membrane enters a next-stage unit, and concentrated water flows back to the microfiltration concentration tank; the invention reasonably integrates the prior art, realizes the aim of zero emission of the smoke washing wastewater and the resource utilization of the crystal salt, and simultaneously protects the environment.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment system which can be widely applied to treatment and recycling of smoke washing wastewater (deacidification wastewater) generated by wet desulphurization in industries such as waste incineration power plants and the like, and realizes zero discharge of the smoke washing wastewater.
Background
The smoke washing wastewater (deacidification wastewater) refers to smoke washing wastewater generated in the smoke purification (wet desulphurization) process of an incinerator in industries such as a waste incineration power plant and the like.
With the improvement of urbanization level and industrialization degree, water resource shortage and water pollution aggravation become global problems to be solved urgently, and the water resource shortage becomes an important restriction factor for economic and social development in China. The regeneration and reuse of industrial waste water are increasingly emphasized, and the national relevant departments restrict industrial water year by year so as to encourage the reuse and circulation. In the field of industrial wastewater recycling, ultrafiltration, microfiltration, reverse osmosis, nanofiltration technologies and combination technologies thereof are gradually popularized and applied in China due to the organic combination of high-efficiency turbidity removal and desalting capabilities and the advantages of small occupied area, less environmental pollution, high automation degree and wide application range.
The smoke washing wastewater component generated in the purification process of the incinerator flue gas of the waste incineration power plant is very complex, mainly contains toxic and harmful pollutants such as ammonia nitrogen, HCl, HF, SOx, heavy metals, suspended matters and residual organic matters, and has large water volume, if the smoke washing wastewater component is not thoroughly treated, the smoke washing wastewater component can cause serious influence on the surrounding environment. At present, the single precipitation method or filtration method is usually adopted to simply treat the smoke washing wastewater, the quality of treated effluent water often cannot meet the requirement of discharge standard, particularly, ammonia nitrogen and organic matters cannot reach the standard, and the generated sludge cannot be properly treated.
In order to save energy, reduce emission and save water resources, the invention integrates a set of systematic zero-discharge scheme aiming at the characteristics and the current treatment situation of the smoke washing wastewater, and leads the treated water quality to reach the production water standard of the factory and be reused in production by a process combining physicochemical pretreatment and membrane filtration. Not only avoids the discharge of pollutants, but also saves water resources.
The closest technical scheme of the invention is as follows: cooling the smoke washing wastewater by a cooler, introducing the smoke washing wastewater into an adjusting blow-off pool, and removing volatile pollutants by using a blow-off method; adding a chelating agent, hydrochloric acid, calcium chloride, ferric trichloride, caustic soda and a coagulant aid in sequence, introducing the wastewater into a first precipitation tank for precipitation, and collecting; sequentially adding aluminum sulfate, hydrochloric acid and an auxiliary flocculating agent, introducing the wastewater into a second precipitation tank for precipitation, and collecting particle impurities; introducing the wastewater into a neutralization tank, and then sequentially introducing the wastewater into a sand filter tower and a zeolite filter tower to further remove residual pollutants, reduce the turbidity of the wastewater and reduce ammonia nitrogen in the wastewater; and finally, introducing the wastewater into a catalytic oxidation tower, and removing organic matters in the wastewater by using a strong oxidant added into the catalytic oxidation tower.
The prior art has the following defects: as the prior art only uses a single flocculation precipitation and softening process, and the types of added medicaments are less, the method has better removal effect on partial pollutants in the smoke washing wastewater, still has a part of pollutants which can not be removed (such as chloride, sulfate, TDS and the like) along with the improvement of the discharge standard, and partially removes the pollutants (such as COD, ammonia nitrogen, total nitrogen and the like) incompletely. In addition, after the smoke washing wastewater is recycled for many times, the salinity of the water is higher and higher, and the smoke washing wastewater cannot be recycled in the alkaline washing tower at last.
Disclosure of Invention
Aiming at the defects of the existing smoke washing wastewater treatment method, the key point of the invention is that the existing processes are reasonably integrated together aiming at the quality of the smoke washing wastewater, and the process combining the physical and chemical pretreatment and the membrane filtration is adopted, namely, the pretreatment, the tubular microfiltration membrane filtration, the high-pressure membrane and the RO are adopted; the combined process of high-pressure membrane and evaporative crystallization makes the treated water reach the standard of the production water of the factory and be reused in production. Not only avoids the discharge of pollutants, but also saves water resources.
The technical means adopted by the invention are as follows.
A zero-emission technical treatment system for smoke washing wastewater comprises: the device comprises a heat exchanger, a wastewater adjusting tank, a first reaction tank, a first sedimentation tank, a second reaction tank, a microfiltration concentration tank, a tubular microfiltration device, a pH neutralization tank, a microfiltration production tank, a high-pressure membrane device, a high-pressure membrane production tank, an RO device and a reuse tank which are sequentially connected with the smoke washing wastewater, wherein a pipeline is additionally arranged in the first reaction tank and connected with a first dosing device, and a pipeline is additionally arranged in the second reaction tank and connected with a second dosing device.
Wherein, the high-pressure membrane device is additionally provided with a pipeline connected with an evaporator, solid miscellaneous salt is obtained by evaporation, and the evaporation cooling water flows back to a reuse pool for reuse; the circulating pipeline is additionally arranged between the microfiltration concentration tank and the tubular microfiltration device through the circulating pump, wastewater in the microfiltration concentration tank is conveyed to the tubular microfiltration device through the circulating pump for solid-liquid separation, the wastewater circularly flows in the tubular microfiltration device, water produced by the filter membrane enters the subordinate unit, and concentrated water flows back to the microfiltration concentration tank for continuous treatment.
Furthermore, the first sedimentation tank and the microfiltration concentration tank are connected with the wastewater adjusting tank through the sludge concentration tank.
Further, the sludge concentration tank is also connected with a sludge storage tank and a sludge dewatering machine in sequence, and filtrate in the sludge dewatering machine flows into the wastewater adjusting tank after passing through the water collecting tank.
Furthermore, a bypass pipeline is additionally arranged between the outlet of the upper unit of the heat exchanger and the outlet of the heat exchanger.
Furthermore, the RO device is additionally provided with a pipeline which is connected with a microfiltration production water tank in a return way.
Further, a basket filter (not shown) is arranged in front of the tubular microfiltration device.
Further, an aeration device (not shown) is arranged in the wastewater adjusting tank and is used for oxidizing the reducing substances and stirring.
Further, the zero discharge technical treatment method of the smoke washing wastewater comprises the following steps.
a. The smoke washing wastewater is subjected to heat exchange by the heat exchanger and then is pumped to a wastewater adjusting tank.
b. Pumping the wastewater in the wastewater adjusting tank to a first reaction tank, adding liquid alkali, a chelating agent, a coagulant and a coagulant aid into the first reaction tank through the first dosing device for precipitation separation, and then introducing the wastewater into the first precipitation tank for precipitation.
c. And the wastewater in the first sedimentation tank overflows into a second reaction tank, liquid caustic soda, a magnesium agent, sodium carbonate and a coagulant are sequentially added into the second reaction tank by the second dosing device for sedimentation separation, and then the wastewater is subjected to solid-liquid separation by a microfiltration concentration tank and a tubular microfiltration device in sequence.
d. And (3) introducing the wastewater obtained in the step into a pH neutralization tank, adding a neutralization reagent to adjust the pH value, then flowing through a microfiltration production water tank 7, and pumping to a high-pressure membrane device.
e. After the smoke washing wastewater is filtered by the high-pressure membrane device, concentrated water enters an evaporator for evaporation and crystallization treatment to obtain solid miscellaneous salt, evaporation cooling water is recycled, and high-pressure membrane produced water flows into an RO device for deep desalination; wherein, the produced water of the RO device enters a reuse water tank for reuse, and the concentrated water flows back to the microfiltration water producing tank.
Preferably, the coagulant in step b and step c is ferric chloride.
Preferably, the neutralizing agent added in step d is hydrochloric acid.
According to the above technical means, the technical effects produced by the present invention are as follows.
(1) The smoke washing wastewater is pretreated by the cooling system, the chemical reaction system, the precipitation system, the high-pressure membrane system and the reverse osmosis system, most pollutants are removed, and the water quality meets the water quality requirement of the discharged water.
(2) The pretreated smoke washing wastewater sequentially passes through a high-pressure membrane device and a reverse osmosis device, the removal rate of pollutants in water can reach more than 99.9%, the removal rate of the total salt content can reach more than 99.8%, the removal rate of ammonia nitrogen can reach more than 97%, and the water quality can reach the water quality of production water.
(3) The device has the advantages of small floor area, good and stable effluent quality, almost no pollution to the environment, water resource saving, high automation degree and the like.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
FIG. 1 shows a flow chart of the present invention. The invention discloses a smoke-washing wastewater zero-discharge technical treatment system and a method, wherein each part is the existing mature equipment or device. It mainly comprises: the device comprises a heat exchanger 1, a wastewater adjusting tank 2, a first reaction tank 31, a first sedimentation tank 4, a second reaction tank 32, a microfiltration concentration tank 51, a tubular microfiltration device 52, a pH neutralization tank 6, a microfiltration water production tank 7, a high-pressure membrane device 8, a high-pressure membrane water production tank 9, an RO device 10 and a reuse water tank 11 which are sequentially connected with the smoke washing wastewater.
Wherein, the high pressure membrane device 8 is additionally provided with a pipeline connected with an evaporator 12, solid miscellaneous salt is obtained by evaporation, and the evaporation cooling water flows back to a reuse water pool 11 for reuse; a circulating pipeline is additionally arranged between the microfiltration concentration tank 51 and the tubular microfiltration device 52 through a circulating pump, wastewater in the microfiltration concentration tank 51 is conveyed to the tubular microfiltration device 52 through the circulating pump for solid-liquid separation, the wastewater circularly flows in the tubular microfiltration device 52, water produced by the filter membrane enters a lower-level unit, and concentrated water flows back to the microfiltration concentration tank 51 for continuous treatment.
Further, the first sedimentation tank 4 and the microfiltration concentration tank 51 are connected back to the wastewater adjusting tank 2 through the sludge concentration tank 101.
Further, the sludge concentration tank 101 is connected with a sludge storage tank 102 and a sludge dewatering machine 103 in sequence, and filtrate in the sludge dewatering machine 103 flows into the wastewater adjusting tank 2 after passing through a water collecting tank 104.
Furthermore, a bypass pipeline is additionally arranged between the outlet of the upper unit of the heat exchanger 1 and the outlet of the heat exchanger.
Furthermore, the RO device 10 is additionally provided with a pipeline connected back to the microfiltration production water tank 7.
Further, in order to protect the filter membrane from damage, a basket filter (not shown) is disposed in front of the tubular microfiltration device 52.
Further, an aeration device (not shown) is provided in the wastewater adjusting tank 2 for oxidizing the reducing substances and for stirring.
Further, the zero discharge technical treatment method of the smoke washing wastewater comprises the following steps.
a. A part of the smoke washing wastewater with higher temperature is firstly subjected to heat exchange and temperature reduction through the heat exchanger 1, and is generally subjected to temperature reduction through circulating cooling water. The rest waste water directly flows through the bypass pipeline, is mixed with the waste water after heat exchange and then is pumped into the waste water regulating tank 2.
b. An aeration device (not shown in the figure) is arranged in the wastewater adjusting tank 2 and used for oxidizing reducing substances and performing a stirring function, then the wastewater in the wastewater adjusting tank 2 is pumped to a first reaction tank 31 (namely a first-stage reaction tank) for first-stage flocculation and precipitation treatment, liquid caustic soda, a chelating agent, a coagulant and a coagulant aid are added into the first reaction tank 31 through the first medicine adding device 301, the chemicals and most heavy metal ions in the smoke washing wastewater perform chemical reaction to generate precipitation, and then the precipitation enters a first precipitation tank 4 (namely a first-stage precipitation tank). The type and amount of the agent to be administered are freely selected by those skilled in the art according to the wastewater condition, wherein the coagulant is preferably ferric chloride.
c. The smoke washing wastewater overflows into a second reaction tank 32 (namely a second-stage reaction tank) after being settled to continue to carry out second-stage flocculation precipitation treatment, liquid caustic soda, a magnesium agent, sodium carbonate and a coagulant are sequentially added into the second reaction tank 32 through a second medicine adding device 302 to remove most of silicon, calcium and magnesium hardness and the like, and then the wastewater is sequentially subjected to solid-liquid separation through a microfiltration concentration tank 51 and a tubular microfiltration device 52. The type and amount of the agent to be administered are freely selected by those skilled in the art according to the wastewater condition, wherein the coagulant is preferably ferric chloride.
In order to further control the water quality turbidity of the smoke washing wastewater before entering a reverse osmosis membrane system, a tubular microfiltration device (internally provided with a tubular microfiltration membrane) is adopted for filtration treatment; conveying the wastewater in the microfiltration concentration tank to a tubular microfiltration membrane by using a circulating pump for solid-liquid separation; waste water flows in the inner circulation of the tubular microfiltration device, water produced by the filter membrane enters a lower-level unit, concentrated water flows back to the inside of the microfiltration concentration tank, and sludge is discharged when the sludge concentration in the microfiltration concentration tank reaches the design upper limit value. Meanwhile, a basket filter is arranged in front of the tubular microfiltration membrane for filtering hard particles and preventing the filtration membrane from being damaged.
d. The smoke washing wastewater filtered by the tubular microfiltration membrane flows into a pH neutralization tank 6, and is subjected to dosing control by a pH online monitoring detector or other detection devices, preferably, the neutralization reagent added in the invention is hydrochloric acid, and the wastewater flows through a microfiltration production tank 7 after being adjusted to a pH value meeting process conditions and then enters a high-pressure membrane device 8. Preferably, the high pressure membrane device may be a DTRO device or a STRO device.
e. After the smoke washing wastewater is filtered by the high-pressure membrane device 8, concentrated water enters the evaporator 12 for evaporation and crystallization treatment to obtain solid miscellaneous salt, the evaporation cooling water flows through the reuse water tank 11 for reuse, the high-pressure membrane produced water enters the high-pressure membrane produced water tank 9, and then flows into the RO device 10 (namely an RO membrane system) through the RO water pump for deep desalination; wherein, the produced water of the RO device enters a reuse water pool 11 for reuse and is reused for replenishing water of the circulating cooling tower; the RO concentrated water flows back to the microfiltration production water tank 7, so that the cyclic utilization and zero discharge of the smoke washing wastewater are realized.
And (4) carrying out outward treatment on sludge generated after the sludge in the sludge storage tank is treated by the dehydrator, and returning the filter-pressing clear liquid to the smoke washing wastewater regulating tank.
In addition, the sludge in the first sedimentation tank and the microfiltration concentration tank is collected and then is conveyed into a sludge concentration tank for concentration, the concentrated sludge is lifted to a sludge storage tank for temporary storage, the sludge in the sludge storage tank is periodically pumped into a sludge dewatering machine for sludge dewatering, the dewatered dry sludge is subjected to subsequent treatment, such as sludge transportation treatment, and the like, and the filter pressing clear liquid flows back to a wastewater adjusting tank for continuous treatment after passing through a water collecting tank.
It is worth to be noted that the evaporative crystallization treatment in the invention generally comprises two processes, wherein ① evaporation refers to a process of removing a solvent from a solute by heating the solvent in a solution, ② crystallization refers to a process of polymerizing the solute into a solid (crystal), and aiming at the problems in the prior art and the water quality characteristics of the smoke washing wastewater, the invention creatively provides a combined process of ' pretreatment + tubular microfiltration membrane filtration + high pressure membrane + RO ', and high pressure membrane + evaporative crystallization ' by pretreating the smoke washing wastewater through a cooling system, a chemical reaction system, a precipitation system, a high pressure membrane system and a reverse osmosis system, and the following effects are obtained according to the treatment process.
(1) Most pollutants in the smoke washing wastewater are removed, and the water quality meets the water quality requirement of the discharged water.
(2) The pretreated smoke washing wastewater sequentially passes through a high-pressure membrane device and a reverse osmosis device, the removal rate of pollutants in water can reach more than 99.9%, the removal rate of the total salt content can reach more than 99.8%, the removal rate of ammonia nitrogen can reach more than 97%, and the water quality can reach the water quality of production water.
(3) The device has the advantages of small floor area, good and stable effluent quality, almost no pollution to the environment, water resource saving, high automation degree and the like, and is worthy of wide popularization.
Claims (10)
1. The utility model provides a smoke washing waste water zero release technical treatment system which characterized in that contains:
the device comprises a heat exchanger (1), a waste water adjusting tank (2), a first reaction tank (31), a first sedimentation tank (4), a second reaction tank (32), a microfiltration concentration tank (51), a tubular microfiltration device (52), a pH neutralization tank (6), a microfiltration water producing tank (7), a high-pressure membrane device (8), a high-pressure membrane water producing tank (9), an RO device (10) and a reuse water tank (11), which are sequentially connected with the smoke washing waste water;
wherein the first reaction tank (31) is additionally provided with a pipeline to be connected with a first medicine adding device (301), the second reaction tank (32) is additionally provided with a pipeline to be connected with a second medicine adding device (302), the high-pressure membrane device (8) is additionally provided with a pipeline to be connected with an evaporator (12), solid miscellaneous salt is obtained by evaporation, and the evaporation cooling water flows back to a reuse water tank (11) to be reused;
a circulating pipeline is additionally arranged between the microfiltration concentration tank (51) and the tubular microfiltration device (52) through a circulating pump, wastewater in the microfiltration concentration tank (51) is conveyed to the tubular microfiltration device (52) through the circulating pump to be subjected to solid-liquid separation, the wastewater circularly flows in the tubular microfiltration device (52), water produced by the filter membrane enters a lower-level unit, and concentrated water flows back to the microfiltration concentration tank (51) to be continuously treated.
2. The technical treatment system for zero discharge of smoke-washing wastewater as claimed in claim 1, wherein the first sedimentation tank (4) and the microfiltration concentration tank (51) are connected back to the wastewater conditioning tank (2) through a sludge concentration tank (101).
3. The technical treatment system for zero discharge of smoke-washing wastewater as defined in claim 1, wherein the sludge concentration tank (101) is further connected with a sludge storage tank (102) and a sludge dewatering machine (103) in sequence, and filtrate in the sludge dewatering machine (103) flows into the wastewater adjusting tank (2) after passing through a water collecting tank (104).
4. The zero discharge technical treatment system for waste water from smoke washing according to claim 3, characterized in that a bypass pipeline is additionally arranged between the outlet of the upper unit of the heat exchanger (1) and the outlet of the heat exchanger.
5. The zero discharge treatment system for waste water from smoke washing in accordance with claim 4, wherein the RO device (10) is further provided with a pipeline connected back to the microfiltration production tank (7).
6. The zero discharge technical treatment system for smoke-washing wastewater as defined in any one of claims 1 to 5, wherein a basket filter is arranged in front of the tubular micro-filtration device (52).
7. The zero discharge technical treatment system for waste water from smoke washing as claimed in any one of claims 1 to 5, wherein an aeration device is arranged in the waste water adjusting tank (2).
8. A smoke-washing wastewater zero-discharge technical treatment method is characterized by comprising the following steps:
a. the smoke washing wastewater is subjected to heat exchange through the heat exchanger (1) and then is pumped to the wastewater adjusting tank (2);
b. pumping the wastewater in the wastewater adjusting tank (2) to a first reaction tank (31), adding liquid caustic soda, a chelating agent, a coagulant and a coagulant aid into the first reaction tank (31) through a first medicine adding device (301) for precipitation and separation, and then introducing the wastewater into a first precipitation tank (4) for precipitation;
c. the wastewater in the first sedimentation tank (4) overflows into a second reaction tank (32), liquid caustic soda, a magnesium agent, sodium carbonate and a coagulant are sequentially added into the second reaction tank (32) through a second medicine adding device (302) for sedimentation and separation, and then the wastewater is sequentially subjected to solid-liquid separation through a microfiltration concentration tank (51) and a tubular microfiltration device (52);
d. introducing the wastewater in the step into a pH neutralization tank (6), adding a neutralization reagent to adjust the pH value, then flowing through a microfiltration production tank (7), and pumping to a high-pressure membrane device (8);
e. after the smoke washing wastewater is filtered by the high-pressure membrane device (8), concentrated water enters the evaporator (12) for evaporation and crystallization treatment to obtain solid miscellaneous salt, evaporation cooling water is recycled, and high-pressure membrane produced water flows into the RO device (10) for deep desalination; wherein, the produced water of the RO device enters a reuse water tank (11) for reuse, and the concentrated water flows back to the microfiltration water producing tank (7).
9. The method for treating zero discharge of waste water from smoke washing according to claim 8, wherein said coagulant in step b and step c is ferric chloride.
10. The method for treating zero discharge of waste water from smoke washing according to claim 8, wherein the neutralizing agent added in step d is hydrochloric acid.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112723652A (en) * | 2020-12-03 | 2021-04-30 | 上海东石塘再生能源有限公司 | High-salinity sewage treatment device and method |
| CN114920404A (en) * | 2022-04-08 | 2022-08-19 | 成都瀚川环境科技有限公司 | Evaporation wastewater pretreatment process |
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| CN110510780A (en) * | 2019-09-23 | 2019-11-29 | 上海双昊环保科技有限公司 | It is a kind of that cigarette waste water recycling processing unit and method are washed using STRO device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017133511A1 (en) * | 2016-02-05 | 2017-08-10 | 大唐环境产业集团股份有限公司 | Treatment apparatus and method for zero liquid discharge of desulfurization wastewater |
| CN110510780A (en) * | 2019-09-23 | 2019-11-29 | 上海双昊环保科技有限公司 | It is a kind of that cigarette waste water recycling processing unit and method are washed using STRO device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112723652A (en) * | 2020-12-03 | 2021-04-30 | 上海东石塘再生能源有限公司 | High-salinity sewage treatment device and method |
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