CN117361772A - Wastewater treatment system and method - Google Patents
Wastewater treatment system and method Download PDFInfo
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- CN117361772A CN117361772A CN202311163059.8A CN202311163059A CN117361772A CN 117361772 A CN117361772 A CN 117361772A CN 202311163059 A CN202311163059 A CN 202311163059A CN 117361772 A CN117361772 A CN 117361772A
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000002351 wastewater Substances 0.000 claims abstract description 186
- 239000002910 solid waste Substances 0.000 claims abstract description 49
- 239000004566 building material Substances 0.000 claims abstract description 33
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 239000007787 solid Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000010808 liquid waste Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 238000009270 solid waste treatment Methods 0.000 claims abstract description 11
- 239000012141 concentrate Substances 0.000 claims abstract description 7
- 230000000379 polymerizing effect Effects 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims description 41
- 238000004062 sedimentation Methods 0.000 claims description 39
- 239000004576 sand Substances 0.000 claims description 26
- 239000012535 impurity Substances 0.000 claims description 25
- 238000005189 flocculation Methods 0.000 claims description 23
- 230000016615 flocculation Effects 0.000 claims description 23
- 238000005273 aeration Methods 0.000 claims description 20
- 238000007254 oxidation reaction Methods 0.000 claims description 16
- 238000004659 sterilization and disinfection Methods 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 12
- 238000001556 precipitation Methods 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 230000000593 degrading effect Effects 0.000 claims description 3
- 230000000249 desinfective effect Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000006116 polymerization reaction Methods 0.000 claims 1
- 239000010813 municipal solid waste Substances 0.000 abstract description 7
- 239000012298 atmosphere Substances 0.000 abstract description 5
- 239000002689 soil Substances 0.000 abstract description 5
- 239000002245 particle Substances 0.000 description 22
- 239000003344 environmental pollutant Substances 0.000 description 10
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- 229920000592 inorganic polymer Polymers 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 239000010419 fine particle Substances 0.000 description 5
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- 239000002002 slurry Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
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- 239000002699 waste material Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 238000005276 aerator Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 239000012985 polymerization agent Substances 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
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- 239000011469 building brick Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
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- 229910001385 heavy metal Inorganic materials 0.000 description 1
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- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 229920000573 polyethylene Polymers 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
Classifications
-
- 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
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to the technical field of wastewater treatment, and discloses a wastewater treatment system and a wastewater treatment method, wherein the wastewater treatment system comprises the following components: a liquid waste treatment subsystem capable of forming solid waste and fine waste water; and a solid waste treatment subsystem capable of forming a concentrate and a building material. Pretreating wastewater to form crude wastewater, concentrating one part of the crude wastewater to form concentrated solution, finely treating the other part of the crude wastewater to form solid wastewater and fine wastewater, mixing and polymerizing the concentrated solution and the solid wastewater to form a mixture, and molding the mixture to obtain the building material capable of being reused. The system and the method treat the solid waste in the wastewater to form building materials, so that the solid waste can be reused, the mode of disposing the solid waste as garbage is replaced, and the possibility of secondary pollution of the solid waste to the atmosphere, the water body and the soil is reduced.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment system and a wastewater treatment method.
Background
The water resource is a key resource affecting the development of human society, and in order to reduce the waste of the water resource, the waste water generated by industry, such as the waste water generated by coal-fired power plants, needs to be treated, and the purpose of the waste water treatment is to separate pollutants in the waste water in a certain way or decompose and convert the pollutants into harmless stable substances, so that the waste water is purified, and the requirements of preventing poison and germ infection and avoiding abnormal odor and bad feeling of visible matters are generally met.
In the prior art known by the inventor, a part of solid waste generated in the wastewater treatment process of the coal-fired power plant can be treated as garbage, namely, the garbage is treated in a land landfill, ash storage pool storage, open-air stockpiling and other modes, and the treatment mode is easy to produce secondary pollution to the atmosphere, water and soil.
Disclosure of Invention
The invention aims to solve the problem that solid waste is treated as garbage to produce secondary pollution in the wastewater treatment in the prior art, and provides a wastewater treatment system and a wastewater treatment method.
In order to achieve the above object, a first aspect of the present invention provides a wastewater treatment system comprising: the liquid waste treatment subsystem comprises a filtering unit, a sand setting tank and a fine treatment unit which are communicated in sequence, wherein the filtering unit is arranged to be capable of filtering particle impurities in the wastewater, the sand setting tank is arranged to be capable of settling sand in the wastewater from the filtering unit and forming coarse wastewater, the sand setting tank is provided with a first outlet and a second outlet for discharging the coarse wastewater, the first outlet of the sand setting tank is communicated with the inlet of the fine treatment unit, and the fine treatment unit is arranged to be capable of treating the coarse wastewater entering the sand setting tank into solid wastewater and fine wastewater; and the solid waste treatment subsystem comprises a concentrator, a mixing mill and a forming machine which are communicated in sequence, wherein the inlet of the concentrator is communicated with the second outlet of the grit chamber, the concentrator is arranged to concentrate coarse wastewater entering the concentrator into concentrated solution, the mixing mill is arranged to mix and polymerize the concentrated solution from the concentrator with the solid waste from the fine treatment unit into a mixture, and the forming machine is arranged to solidify the mixture from the mixing mill into a building material capable of being reused.
Preferably, the solid waste treatment subsystem further comprises a curing chamber, wherein an inlet of the curing chamber is communicated with an outlet of the forming machine, and the curing chamber can store building materials.
Preferably, the filtering unit comprises a coarse grid pool and a fine grid pool which are sequentially communicated along the flowing direction of the wastewater, a coarse grid is arranged in the coarse grid pool, a fine grid is arranged in the fine grid pool, and grid gaps of the coarse grid are larger than those of the fine grid.
Preferably, the grid gap of the coarse grid is 16 mm-25 mm; and/or the grid gap of the fine grid is 1.5 mm-10 mm.
Preferably, the fine treatment unit comprises a primary sedimentation tank, an aeration tank, an oxidation reaction tank and a secondary sedimentation tank which are sequentially communicated, wherein the secondary sedimentation tank is provided with a solid waste outlet, and the solid waste outlet of the secondary sedimentation tank is communicated with a solid waste inlet of the mixing mill.
Preferably, the liquid waste treatment subsystem further comprises a flocculation tank, a filter and a disinfection tank which are communicated in sequence, the secondary sedimentation tank is further provided with a liquid waste outlet, an inlet of the flocculation tank is communicated with the liquid waste outlet of the secondary sedimentation tank, the flocculation tank can oxidatively degrade harmful substances in the fine waste water from the secondary sedimentation tank, the filter can filter the fine waste water from the flocculation tank, and the disinfection tank can disinfect the fine waste water from the filter and form qualified water which can be discharged.
The second aspect of the present invention provides a wastewater treatment method comprising the steps of: pretreating the wastewater to obtain crude wastewater; concentrating one part of the crude wastewater to obtain concentrated solution, and carrying out fine treatment on the other part of the crude wastewater to obtain solid wastewater and fine wastewater; mixing and polymerizing the concentrated solution and the solid waste to form a mixture; and molding the mixture to obtain the building material capable of being reused.
Preferably, the wastewater treatment method further comprises: and storing the building materials.
Preferably, the step of pre-treating the wastewater specifically comprises: after the wastewater is subjected to coarse filtration and fine filtration in sequence, sand and stone in the wastewater are precipitated, so that coarse wastewater is obtained; and/or the step of carrying out fine treatment on the other part of the coarse wastewater specifically comprises the following steps: and sequentially carrying out primary precipitation, aeration, oxidation and secondary precipitation on the other part of the crude wastewater to obtain solid wastewater and fine wastewater.
Preferably, the wastewater treatment method is performed using the wastewater treatment system described above.
Through the technical scheme, the wastewater is pretreated to form crude wastewater, a part of crude wastewater is concentrated to form concentrated solution, the other part of crude wastewater is finely treated to form solid wastewater and fine wastewater, the concentrated solution and the solid wastewater are mixed and polymerized to form a mixture, and the mixture is molded to obtain the building material capable of being reused. The system and the method treat the solid waste in the wastewater to form building materials, so that the solid waste can be reused, the mode of disposing the solid waste as garbage is replaced, and the possibility of secondary pollution of the solid waste to the atmosphere, the water body and the soil is reduced.
Drawings
FIG. 1 is a schematic diagram of a wastewater treatment system of the present invention; and
FIG. 2 is a schematic diagram of another form of wastewater treatment system of the present invention.
Description of the reference numerals
1. A coarse grille pool; 2. a fine grid pool; 3. a sand setting tank; 4. a primary sedimentation tank; 5. an aeration tank; 6. an oxidation reaction tank; 7. a secondary sedimentation tank; 8. a flocculation tank; 9. a filter; 10. a sterilizing pool; 11. a concentrator; 12. a mixer; 13. a molding machine; 14. a curing room; 100. a liquid waste treatment subsystem; 101. a filtering unit; 102. a fine processing unit; 200. and a solid waste treatment subsystem.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Referring to fig. 1 and 2, the present invention provides a wastewater treatment system comprising: a liquid waste treatment subsystem 100, the liquid waste treatment subsystem 100 comprising a filtration unit 101, a grit chamber 3 and a fine treatment unit 102 which are sequentially communicated, the filtration unit 101 being configured to be capable of filtering particulate impurities in the wastewater, the grit chamber 3 being configured to be capable of settling sand in the wastewater from the filtration unit 101 and forming coarse wastewater, the grit chamber 3 having a first outlet and a second outlet for the coarse wastewater to be discharged, the first outlet of the grit chamber 3 being in communication with an inlet of the fine treatment unit 102, the fine treatment unit 102 being configured to be capable of treating the coarse wastewater entering therein to form solid waste and fine wastewater; and a solid waste treatment subsystem 200, the solid waste treatment subsystem 200 comprising a thickener 11, a mixer 12 and a forming machine 13 which are communicated in this order, an inlet of the thickener 11 being communicated with a second outlet of the grit chamber 3, the thickener 11 being arranged to be capable of concentrating coarse wastewater entering therein to form a concentrate, the mixer 12 being arranged to be capable of mixing and polymerizing the concentrate from the thickener 11 with solid waste from the fine treatment unit 102 to form a mixture, the forming machine 13 being arranged to be capable of solidifying the mixture from the mixer 12 to form a building material capable of being reused.
In the embodiment, the wastewater is pretreated by the filtering unit 101 and the grit chamber 3 to form coarse wastewater, and the filtering unit 101 and the grit chamber 3 remove the particle impurities and sand in the wastewater by a physical filtering mode; the coarse waste water is divided into two parts, one part of the coarse waste water enters the fine treatment unit 102, the other part of the coarse waste water enters the concentrator 11 of the solid waste treatment subsystem 200, the coarse waste water entering the fine treatment unit 102 is continuously treated to form solid waste and fine waste water, the solid waste is mainly slurry and precipitated suspended matters, the coarse waste water entering the concentrator 11 is concentrated and mainly used for forming concentrated solution, the concentrated solution and the solid waste water enter the mixing mill 12 together, an inorganic polymerizer (indicated by a broken line arrow on the right side of the mixing mill 12 in fig. 1 or 2) is added into the mixing mill 12, the chemical combination and adsorption of the inorganic polymerizer on pollutants and salts and the physical blocking effect of an inorganic polymer cage structure are utilized to generate low-permeation high-strength inorganic polymer solids, so that the pollutants and the salts are directly solidified and packaged, the inorganic polymer solids are the mixture formed by the solid waste and the concentrated solution, and the mixture ratio of different components is utilized to form various environment-acceptable temporary bricks such as curbstones and road bricks, or production and filling bricks of the road bricks or as road bricks, building bricks, and the waste bricks are utilized, and waste resources are utilized. The solid waste is combined with the concentrated solution to form a building material capable of being reused, the system enables the solid waste to be reused through treatment, replaces a mode of disposing the solid waste as garbage in the prior art, and reduces the possibility of secondary pollution of the solid waste to the atmosphere, the water body and the soil.
Specifically, the wastewater treated by the wastewater treatment system is wastewater generated by a coal-fired power plant, and the wastewater has high salt content and also contains chlorine, calcium, magnesium, heavy metals and the like. The solid waste contains substances such as pulverized coal ash, slag and the like.
Before the building material is put into use, the building material needs to be detected, and when the building material meets the condition that secondary pollution is not formed any more, the building material is reused.
Referring to fig. 1 and 2, in one embodiment of the present invention, the solid waste treatment subsystem 200 further includes a curing chamber 14, an inlet of the curing chamber 14 is communicated with an outlet of the forming machine 13, and the curing chamber 14 is capable of storing building materials.
In this embodiment, the curing chamber 14 is used for storing the formed building material, and provides a receiving space for the building material, so as to avoid the building material from being influenced by external environment and being unable to be reused. When building material is needed, the building material is taken out of the curing chamber 14.
Referring to fig. 1 and 2, in one embodiment of the present invention, the filtering unit 101 includes a coarse grating tank 1 and a fine grating tank 2 which are sequentially connected in a flow direction of wastewater, a coarse grating is provided in the coarse grating tank 1, a fine grating is provided in the fine grating tank 2, and grating gaps of the coarse grating are larger than those of the fine grating.
In the embodiment, the wastewater enters the coarse grid tank 1, passes through the coarse grid, large-particle-size particle impurities in the wastewater are intercepted by the coarse grid, remain in the coarse grid tank 1 for subsequent cleaning, continue to enter the fine grid tank 2, pass through the fine grid, small-particle-size particle impurities in the wastewater are intercepted by the fine grid, remain in the fine grid tank 2 for subsequent cleaning, continue to enter the sand settling tank 3, sand in the wastewater is settled and remain in the sand settling tank 3, water on the upper layer in the sand settling tank 3 forms coarse wastewater, and the particle size of the sand is smaller than that of the small-particle-size particle impurities. The coarse grille pool 1 and the fine grille pool 2 are different in grating strip gaps through the gratings, filter particle impurities with different particle diameters, and are combined with the grit chamber 3 to realize gradient physical filtration of wastewater, so that the particle impurities and sand in the wastewater are removed as much as possible.
Referring to fig. 1 and 2, in one embodiment of the present invention, the grating gaps of the coarse grating are 16 mm-25 mm; the grid gap of the fine grid is 1.5 mm-10 mm.
In the embodiment, the particle impurities with the smallest size larger than 16-25 mm in the wastewater are classified as large-particle-diameter impurities, the coarse grille is specially used for filtering the large-particle-diameter particle impurities, the number of the large-particle-diameter particle impurities intercepted by the coarse grille is moderate, the particle impurities with the smallest size larger than 1.5-10 mm are classified as small-particle-diameter impurities, the fine grille is specially used for filtering the small-particle-diameter particle impurities, the number of the small-particle-diameter particle impurities intercepted by the fine grille is also moderate, the combination of the coarse grille pool 1 and the fine grille pool 2 is realized, gradient physical filtration is realized, and grid blockage caused by excessive number of the singly filtered particle impurities is avoided, so that the influence on the filtration efficiency is avoided.
Referring to fig. 1 and 2, in one embodiment of the present invention, the fine treatment unit 102 includes a primary sedimentation tank 4, an aeration tank 5, an oxidation reaction tank 6, and a secondary sedimentation tank 7 which are sequentially communicated, the secondary sedimentation tank 7 having a solid waste outlet, the solid waste outlet of the secondary sedimentation tank 7 being communicated with a solid waste inlet of a mixer 12.
In this embodiment, the primary sedimentation tank 4 removes fine suspended matters in the crude wastewater entering the primary sedimentation tank through overflow; the aeration tank 5 carries out aeration treatment on the crude wastewater treated by the primary sedimentation tank 4, an aerator is arranged in the aeration tank 5, and the aerator stirs the crude wastewater in the aeration tank 5 to decompose organic matters which can cause pollution in the crude wastewater and reduce the concentration of the organic matters in the crude wastewater; the oxidation reaction tank 6 is used for carrying out oxidation treatment on the crude wastewater treated by the aeration tank 5, and absorbing fine particles in the crude wastewater, namely removing the fine particles in the crude wastewater; the secondary sedimentation tank 7 is used for redeposition of the crude wastewater treated by the oxidation reaction tank 6, so that solid-liquid separation is carried out on the crude wastewater, substances such as slurry and active mud in the crude wastewater are removed, mud-water separation treatment of the secondary sedimentation tank 7 is combined with contact oxidation aeration treatment of the crude wastewater by the aeration tank 5 and the oxidation reaction tank 6, so that the toxicity of the crude wastewater is effectively reduced, fine wastewater and solid wastewater are formed after the solid-liquid separation of the secondary sedimentation tank 7, and the fine wastewater continues to enter subsequent treatment equipment for treatment. The solid waste after passing through the fine treatment unit 102 does not contain pollutants or the content of the pollutants meets the requirement, and the solid waste is treated at the moment, so that the finally formed building material cannot cause secondary pollution.
Referring to fig. 1 and 2, in one embodiment of the present invention, the liquid waste treatment subsystem 100 further includes a flocculation tank 8, a filter 9 and a disinfection tank 10 which are sequentially communicated, the secondary sedimentation tank 7 further has a liquid waste outlet, an inlet of the flocculation tank 8 is communicated with the liquid waste outlet of the secondary sedimentation tank 7, the flocculation tank 8 is capable of oxidatively degrading harmful substances in the fine waste water from the secondary sedimentation tank 7, the filter 9 is capable of filtering the fine waste water from the flocculation tank 8, and the disinfection tank 10 is capable of disinfecting the fine waste water from the filter 9 and forming qualified water which can be discharged.
In this embodiment, the fine wastewater treated by the secondary sedimentation tank 7 enters a flocculation tank 8, a flocculating agent (indicated by a vertically downward arrow between the secondary sedimentation tank 7 and the flocculation tank 8 in fig. 1 or 2) is added into the flocculation tank 8, and harmful substances such as colloid and fine suspended matters in the fine wastewater are degraded, and after re-coagulation and sedimentation, cement separation is performed; the filter 9 is used for carrying out adsorption filtration on the fine wastewater treated by the flocculation tank 8 and intercepting fine solids in the fine wastewater in a physical filtration mode; the disinfection tank 10 disinfects the fine wastewater treated by the filter 9 to kill bacteria and other toxic substances in the fine wastewater to form qualified water which meets the discharge standard, does not pollute and harm the environment, and can be used as production reuse water. The flocculation tank 8, the filter 9 and the disinfection tank 10 are used for continuously treating the fine wastewater, so that the fine wastewater can form qualified water meeting the discharge requirement, and the pollution of solid waste to the environment is avoided, and meanwhile the pollution of liquid waste to the environment is avoided. The system has low cost, high efficiency and stable performance for wastewater treatment.
Specifically, the filter 9 is a porous carbon filter 9; the disinfection tank 10 is an ultraviolet disinfection tank 10. The flocculant is a composite flocculant.
The second aspect of the present invention provides a wastewater treatment method comprising the steps of: pretreating the wastewater to obtain crude wastewater; concentrating one part of the crude wastewater to obtain concentrated solution, and carrying out fine treatment on the other part of the crude wastewater to obtain solid wastewater and fine wastewater; mixing and polymerizing the concentrated solution and the solid waste to form a mixture; and molding the mixture to obtain the building material capable of being reused.
In the embodiment, the pretreatment is carried out by a physical filtration mode to remove the particle impurities and sand in the wastewater to obtain crude wastewater; the coarse waste water is divided into two parts, one part is concentrated to form concentrated solution for forming a mixture with the solid waste, and the other part of the coarse waste water is subjected to fine treatment continuously to obtain fine waste water and solid waste. The mixture can be processed to form building materials, so that the solid waste can be reused, a mode of disposing the solid waste as garbage in the prior art is replaced, and the possibility of secondary pollution of the solid waste to the atmosphere, the water body and the soil is reduced.
In one embodiment of the invention, the wastewater treatment method further comprises: and storing the building materials.
In this embodiment, the stored building material is isolated from the outside, and the influence of the outside environment on the building material is avoided.
In one embodiment of the present invention, the step of pretreating the wastewater specifically includes: and (3) after the wastewater is subjected to coarse filtration and fine filtration in sequence, precipitating sand in the wastewater to obtain coarse wastewater.
In the embodiment, the wastewater is subjected to gradient physical filtration, and the large-particle-size particle impurities, the small-particle-size particle impurities and the smaller-particle-size sand in the wastewater are sequentially removed by filtration, and on one hand, the particle impurities and the sand in the wastewater are removed as completely as possible in a gradient filtration mode; on the other hand, the influence on the filtering efficiency due to excessive amounts of the granular impurities and sand removed at one time is avoided.
In one embodiment of the invention, the step of carrying out fine treatment on the other part of the coarse wastewater specifically comprises the following steps: and sequentially carrying out primary precipitation, aeration, oxidation and secondary precipitation on the other part of the crude wastewater to obtain solid wastewater and fine wastewater.
In this example, fine suspended matters in the crude wastewater are removed by one-time precipitation; stirring the crude wastewater through aeration, decomposing organic matters which can cause pollution in the crude wastewater, and reducing the concentration of the organic matters which can cause pollution in the crude wastewater; oxidizing the crude wastewater to adsorb fine particles in the crude wastewater by oxidization, namely removing the fine particles in the crude wastewater; and (3) separating solid from liquid in the crude wastewater through secondary precipitation, and removing substances such as slurry, active mud and the like in the crude wastewater.
Specifically, the fine wastewater is subjected to flocculation, filtration and disinfection to obtain qualified water meeting the discharge requirement. The method has the advantages that the solid waste is treated, so that the pollution of the solid waste to the environment is avoided, the pollution of the liquid waste to the environment is also avoided, and the qualified water can be used as the production reuse water.
Referring to fig. 1 and 2, in another embodiment of the present invention, a wastewater treatment method is performed by using the wastewater treatment system, and specifically includes the following steps:
s1, sequentially filtering and removing large-particle-size particle impurities and small-particle-size particle impurities in wastewater through a coarse grid pool 1 and a fine grid pool 2;
s2, introducing the wastewater treated by the coarse grid tank 1 and the fine grid tank 2 into a sand setting tank 3, and removing sand sediment in the wastewater through the sand setting tank 3 to obtain coarse wastewater;
s3, introducing a part of the crude wastewater into a concentrator 11, concentrating the crude wastewater through the concentrator 11 to obtain concentrated solution, and introducing the concentrated solution into a mixing roll 12; introducing the other part of the crude wastewater into a primary sedimentation tank 4, removing fine suspended matters in the crude wastewater through the overflow effect of the primary sedimentation tank 4, introducing the crude wastewater treated by the primary sedimentation tank 4 into an aeration tank 5, aerating the crude wastewater in the aeration tank 5 for 50min, standing for 40min, decomposing pollutants in the crude wastewater through the aeration and stirring effects of the aeration tank 5, reducing the concentration of pollutants in the crude wastewater, introducing the crude wastewater treated by the aeration tank 5 into an oxidation reaction tank 6, adsorbing fine particles in the crude wastewater through the maintenance effect of the oxidation reaction tank 6, introducing the crude wastewater treated by the oxidation reaction tank 6 into a secondary sedimentation tank 7, enabling the crude wastewater to stay in the secondary sedimentation tank 7 for 0.5-2 h, performing solid-liquid separation on the crude wastewater through the sedimentation effect of the secondary sedimentation tank 7, removing substances such as slurry, active mud and the like in the crude wastewater, obtaining fine wastewater and solid wastewater, introducing the fine wastewater into a flocculation tank 8, and introducing the solid wastewater into a mixing mill 12;
s4, adding an inorganic polymerization agent into a mixing mill 12, mixing and polymerizing the concentrated solution and the solid waste through the mixing mill 12, generating low-permeability and high-strength inorganic polymer solids by utilizing the chemical combination and adsorption of the inorganic polymerization agent on pollutants and salt and the physical barrier effect of an inorganic polymer cage structure, directly curing and encapsulating the pollutants and the salt, wherein the inorganic polymer solids are the mixture, introducing the mixture into a forming machine 13 to form a building material capable of being reused, and storing the building material into a curing chamber 14;
s5, adding a composite flocculant into the flocculation tank 8, wherein the addition amount of the flocculant accounts for 0.01% -0.05% of the amount of wastewater entering the flocculation tank 8, degrading colloid, fine suspended matters and other harmful substances in the fine wastewater, performing cement separation after coagulating and precipitating, introducing the fine wastewater treated by the flocculation tank 8 into a filter 9, adsorbing and intercepting fine solids in the fine wastewater through the adsorption and filtration effect of the filter 9, introducing the fine wastewater treated by the filter 9 into a disinfection tank 10, and sterilizing bacteria and other toxic substances in the fine wastewater through the disinfection effect of the disinfection tank 10 to form qualified water meeting the discharge requirements.
The above steps S4 and S5 can be performed simultaneously.
In the prior art, for example, patent application No. 201710912221.X discloses a spray paint wastewater treatment process, in the wastewater treatment process, various agents such as neutralizing agent, demulsifier, anaerobic bacteria, potassium permanganate, polyethylene solution and the like are required to be added.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of individual specific technical features in any suitable way. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.
Claims (10)
1. A wastewater treatment system, comprising:
a liquid waste treatment subsystem (100), the liquid waste treatment subsystem (100) comprising a filtration unit (101), a grit chamber (3) and a fine treatment unit (102) in communication in sequence, the filtration unit (101) being arranged to be able to filter particulate impurities in the wastewater, the grit chamber (3) being arranged to be able to sediment sand in the wastewater from the filtration unit (101) and form a raw wastewater, the grit chamber (3) having a first outlet and a second outlet for the raw wastewater to drain, the first outlet of the grit chamber (3) being in communication with the inlet of the fine treatment unit (102), the fine treatment unit (102) being arranged to be able to treat the raw wastewater entering therein to form solid wastewater and fine wastewater; and
the solid waste treatment subsystem (200), solid waste treatment subsystem (200) is including concentrator (11), mixer (12) and make-up machine (13) that communicate in proper order, the entry of concentrator (11) with the second export intercommunication of grit chamber (3), concentrator (11) set up to can get into wherein coarse waste water concentration forms concentrate, mixer (12) set up to can come from concentrate of concentrator (11) with come from the solid waste mixture of polymerization formation mixture of fine processing unit (102), make-up machine (13) set up to be able to solidify the mixture that comes from mixer (12) and form the building materials that can reuse.
2. The wastewater treatment system of claim 1, wherein the solid waste treatment subsystem (200) further comprises a curing chamber (14), an inlet of the curing chamber (14) being in communication with an outlet of the forming machine (13), the curing chamber (14) being capable of storing the building material.
3. The wastewater treatment system according to claim 1, characterized in that the filtering unit (101) comprises a coarse grid cell (1) and a fine grid cell (2) which are sequentially communicated along the wastewater flow direction, wherein a coarse grid is arranged in the coarse grid cell (1), a fine grid is arranged in the fine grid cell (2), and grid gaps of the coarse grid are larger than grid gaps of the fine grid.
4. A wastewater treatment system according to claim 3, wherein the coarse grid has a grid gap of 16mm to 25mm; and/or the grid gap of the fine grid is 1.5 mm-10 mm.
5. The wastewater treatment system according to any one of claims 1 to 4, characterized in that the fine treatment unit (102) comprises a primary sedimentation tank (4), an aeration tank (5), an oxidation reaction tank (6) and a secondary sedimentation tank (7) which are communicated in this order, the secondary sedimentation tank (7) having a solid waste outlet, the solid waste outlet of the secondary sedimentation tank (7) being communicated with a solid waste inlet of the mixer (12).
6. The wastewater treatment system of claim 5, wherein the liquid waste treatment subsystem (100) further comprises a flocculation basin (8), a filter (9) and a disinfection basin (10) which are sequentially communicated, the secondary sedimentation basin (7) further has a liquid waste outlet, an inlet of the flocculation basin (8) is communicated with the liquid waste outlet of the secondary sedimentation basin (7), the flocculation basin (8) is capable of oxidatively degrading harmful substances in the fine wastewater from the secondary sedimentation basin (7), the filter (9) is capable of filtering the fine wastewater from the flocculation basin (8), and the disinfection basin (10) is capable of disinfecting the fine wastewater from the filter (9) and forming acceptable water which can be discharged.
7. A wastewater treatment method, comprising the steps of:
pretreating the wastewater to obtain crude wastewater;
concentrating one part of the crude wastewater to obtain concentrated solution, and carrying out fine treatment on the other part of the crude wastewater to obtain solid waste and fine wastewater;
mixing and polymerizing the concentrate and the solid waste to form a mixture;
and molding the mixture to obtain the building material capable of being reused.
8. The wastewater treatment method according to claim 7, characterized in that the wastewater treatment method further comprises: and storing the building material.
9. The method for wastewater treatment according to claim 7, wherein the step of pretreating wastewater specifically comprises: after the wastewater is subjected to coarse filtration and fine filtration in sequence, sand and stone in the wastewater are precipitated, so that coarse wastewater is obtained; and/or the number of the groups of groups,
the step of carrying out fine treatment on the other part of the crude wastewater specifically comprises the following steps: and sequentially carrying out primary precipitation, aeration, oxidation and secondary precipitation on the other part of the crude wastewater to obtain solid waste and fine wastewater.
10. The wastewater treatment method according to claim 7, wherein the wastewater treatment method is performed using the wastewater treatment system according to any one of claims 1 to 6.
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| CN202311163059.8A CN117361772A (en) | 2023-09-08 | 2023-09-08 | Wastewater treatment system and method |
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