CN211284050U - Zero-discharge technical treatment system for smoke washing wastewater - Google Patents
Zero-discharge technical treatment system for smoke washing wastewater Download PDFInfo
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- CN211284050U CN211284050U CN201922261686.0U CN201922261686U CN211284050U CN 211284050 U CN211284050 U CN 211284050U CN 201922261686 U CN201922261686 U CN 201922261686U CN 211284050 U CN211284050 U CN 211284050U
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Abstract
The utility model discloses a smoke washing wastewater zero discharge technical treatment system, which 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 water production tank, a high-pressure membrane device, a high-pressure membrane water production tank, an RO device and a reuse water tank which are sequentially connected with the smoke washing wastewater; 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 pumped to the tubular microfiltration device 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; this is novel with current technology reasonable integration, has realized the target of the zero release of smoke waste water and the resource utilization of crystal salt, has also protected the environment simultaneously.
Description
Technical Field
The utility model belongs to the technical field of waste water treatment, concretely relates to can extensively be applicable to the processing and the recycle of the smoke cleaning waste water (deacidification waste water) that trade wet flue gas desulfurization such as waste incineration power plant produced, realize smoke cleaning waste water zero release technical treatment system.
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 energy saving and emission reduction, the water economy resource, the utility model discloses characteristics and the processing current situation to washing cigarette waste water have integrated the zero row scheme of one set of system, through the technology that materialization method preliminary treatment and membrane filtration combined together, make the quality of water after handling reach this factory's production water standard and recycle in the production. Not only avoids the discharge of pollutants, but also saves water resources.
With the utility model discloses closest technical scheme: 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.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the existing smoke washing wastewater treatment method, the key point of the utility model is that the existing process is 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 utility model 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 disposed in front of the tubular microfiltration device 52.
Further, an aeration device (not shown) is arranged in the wastewater adjusting tank and is used for oxidizing the reducing substances and stirring.
According to the above technical means, the technical effects of 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 schematic view of the flow structure of the present invention.
Detailed Description
Referring to fig. 1, the flow structure of the present invention is schematically illustrated, and as shown in the figure, each component of the system for treating zero discharge of waste water from flue gas cleaning is a mature device or apparatus. As shown in the figure the system of the utility model 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, a reuse water tank 11 and an evaporator 12 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.
In addition, processing system still includes catch basin 104 and sludge thickening tank 101, first sedimentation tank 4 with microfiltration concentration tank 51 connects back waste water equalizing basin 2 through sludge thickening tank 101, sludge thickening tank 101 still is connected with sludge storage tank 102, sludge dewaterer 103 in order, the filtrating in sludge dewaterer 103 flows into waste water equalizing basin 2 behind the catch basin.
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 first reaction tank 31 is further provided with a pipeline connected with the first chemical adding device 301, and the second reaction tank 32 is further provided with a pipeline connected with the second chemical adding device 302.
The utility model discloses when the in-service use, wash the cigarette waste water and collect the back through the factory, the higher cigarette waste water that washes of some temperature is earlier through 1 heat transfer cooling of heat exchanger, generally cools down through recirculated 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.
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 dosage of the medicament are freely selected by those skilled in the art according to the wastewater condition, wherein the coagulant is preferably ferric chloride
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.
In the filterable cigarette washing waste water of managerial formula microfiltration membrane flowed into pH neutralization pond 6, add medicine control, preferred through pH on-line monitoring detector or other detection device the utility model discloses well neutralizing agent of throwing is hydrochloric acid, and waste water flows through behind the pH value that accords with the technological condition behind the microfiltration product pond 7 and enters high pressure membrane device 8. Preferably, the high pressure membrane device may be a DTRO device or a STRO device.
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.
Further, the sludge in the sludge storage tank 102 is treated by the sludge dewatering machine 103 to generate sludge to be transported outside, and the filter-pressing clear liquid is returned to the smoke-washing wastewater adjusting tank 104.
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 mentioning that the evaporative crystallization process of the present invention generally comprises two processes: firstly, evaporation refers to a process of separating a solvent from a solute in a solution in a heating mode; crystallization is the process of solute polymerization into a solid (crystals); aiming at the problems existing in the prior art and the water quality characteristics of the smoke washing wastewater, the utility model pretreats 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 creatively provides 'pretreatment + tubular micro-filtration membrane filtration + high-pressure membrane + RO'; the combined process of high pressure film + evaporative crystallization "provides the following effects 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 (7)
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 chemical adding device (301), the second reaction tank (32) is additionally provided with a pipeline to be connected with a second chemical adding device (302), the high-pressure membrane device (8) is additionally provided with a pipeline to be connected with an evaporator (12), and the evaporative 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 2, 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).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922261686.0U CN211284050U (en) | 2019-12-16 | 2019-12-16 | Zero-discharge technical treatment system for smoke washing wastewater |
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| CN201922261686.0U CN211284050U (en) | 2019-12-16 | 2019-12-16 | Zero-discharge technical treatment system for smoke washing wastewater |
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| CN211284050U true CN211284050U (en) | 2020-08-18 |
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| CN201922261686.0U Active CN211284050U (en) | 2019-12-16 | 2019-12-16 | Zero-discharge technical treatment system for smoke washing wastewater |
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