CN111348812A - Metal surface coating wastewater recycling system - Google Patents
Metal surface coating wastewater recycling system Download PDFInfo
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- CN111348812A CN111348812A CN202010336432.5A CN202010336432A CN111348812A CN 111348812 A CN111348812 A CN 111348812A CN 202010336432 A CN202010336432 A CN 202010336432A CN 111348812 A CN111348812 A CN 111348812A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 34
- 239000011248 coating agent Substances 0.000 title claims abstract description 27
- 238000000576 coating method Methods 0.000 title claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 27
- 239000002184 metal Substances 0.000 title claims abstract description 27
- 238000004064 recycling Methods 0.000 title claims abstract description 26
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 64
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000012528 membrane Substances 0.000 claims abstract description 32
- 230000007062 hydrolysis Effects 0.000 claims abstract description 28
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 28
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- 238000000746 purification Methods 0.000 claims abstract description 18
- 230000015556 catabolic process Effects 0.000 claims abstract description 6
- 238000006731 degradation reaction Methods 0.000 claims abstract description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000460 chlorine Substances 0.000 claims abstract description 5
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 5
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 5
- 150000002500 ions Chemical class 0.000 claims abstract description 5
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 3
- 239000010452 phosphate Substances 0.000 claims abstract description 3
- -1 phosphate radical ions Chemical class 0.000 claims abstract description 3
- 239000010802 sludge Substances 0.000 claims description 30
- 238000004062 sedimentation Methods 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 12
- 238000005345 coagulation Methods 0.000 claims description 10
- 230000015271 coagulation Effects 0.000 claims description 10
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- 230000016615 flocculation Effects 0.000 claims description 10
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- 238000005273 aeration Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 6
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- 239000003814 drug Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 4
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
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- 230000000694 effects Effects 0.000 description 5
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- 238000005406 washing Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
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- 238000001914 filtration Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
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- 229910052760 oxygen Inorganic materials 0.000 description 3
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- 241000894006 Bacteria Species 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
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- 231100000719 pollutant Toxicity 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000009303 advanced oxidation process reaction Methods 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/441—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
- C02F1/52—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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a metal surface coating wastewater recycling system which comprises a physicochemical treatment unit, a hydrolysis acidification tank, an MBR tank, a first biological aerated filter, an active carbon filter, a reverse osmosis system and a second biological aerated filter, wherein sewage is treated by the physicochemical treatment unit to remove heavy metal ions, phosphate radical ions and suspended matters in the wastewater, the effluent of the physicochemical treatment unit flows into the hydrolysis acidification tank for degradation treatment, the effluent of the hydrolysis acidification tank flows into the MBR tank for purification treatment, the effluent of the MBR tank flows into the first biological aerated filter for purification treatment, the effluent of the first biological aerated filter flows into the active carbon filter for removal of residual chlorine, the effluent of the active carbon filter flows into the reverse osmosis system for purification treatment, the produced water of the reverse osmosis system is recycled, and the concentrated solution of the reverse osmosis system flows into the second biological aerated filter for purification treatment. The method has the advantages of simple process, reduced medicament investment, prolonged service life of the RO membrane and reduced enterprise cost.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a metal surface coating wastewater recycling system.
Background
The metal surface coating wastewater contains a large amount of organic substances and other pollutants which are difficult to degrade, and the production process is recycled after treatment, so that water can be saved, the enterprise cost is reduced, more importantly, the environmental pollution is avoided, and the harm is brought to human beings. The existing treatment process comprises the following steps: firstly, performing solid-liquid separation through physical and chemical precipitation, then decomposing organic matters into water and carbon dioxide by utilizing the degradation effect of microorganisms in an aerobic tank, enabling effluent water of the aerobic tank to enter a biological precipitation tank, and adding a polymeric flocculant (PAM) into the biological precipitation tank to ensure the quality of the effluent water so as to realize solid-liquid separation; then filtering by an Ultrafiltration (UF) system, entering a Reverse Osmosis (RO) system, and allowing the produced water to permeate an RO membrane for recycling under the action of a reverse osmosis membrane; and (3) discharging the concentrated water into a concentrated water collecting tank, adjusting the pH value to be acidic, then feeding the concentrated water into an advanced oxidation system, adding ferrous iron and hydrogen peroxide for advanced oxidation, then adjusting the pH value to be neutral, feeding the concentrated water into a coagulating sedimentation tank, and discharging the concentrated water after solid-liquid separation. Because the wastewater needs to be recycled through the RO reverse osmosis system, the sludge concentration in the aerobic tank is lower, the biological treatment degradation is incomplete, and the effluent of the biological sedimentation tank contains higher organic matters and suspended matters, and can enter the RO reverse osmosis system only through the filtration treatment of an Ultrafiltration (UF) system, the process is complicated, the treatment flow is long, and the operation cost is high. Particularly, a polymeric flocculant (PAM) is added into the biological sedimentation tank, the residual polymeric organic matters in effluent are high, so that a UF membrane is frequently blocked, the drug washing is frequent, particularly, the PAM can cause the membrane to be permanently blocked, the UF effluent flux and effect are reduced, meanwhile, the RO membrane is blocked, the drug washing needs to be frequently carried out, and the service life of the RO membrane is usually only about 1 year and needs to be completely replaced; causing high operation cost of the reuse water system and frequent drug washing and maintenance. In addition, concentrated water generated by the RO system can be discharged after reaching the standard after being treated by a chemical advanced oxidation process, a large amount of medicament needs to be added, the treatment process is complex, a plurality of supporting equipment is provided, and the energy consumption is high.
Therefore, it is necessary to provide a system for recycling waste water from metal surface coating to solve the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a metal surface coating wastewater recycling system which is simple in process, reduces the medicament investment, prolongs the service life of an RO (reverse osmosis) membrane and reduces the enterprise cost.
In order to achieve the above object, the present invention discloses a metal surface coating wastewater recycling system, comprising: a physicochemical treatment unit, a hydrolysis acidification tank, an MBR tank, a first biological aerated filter, an activated carbon filter, a reverse osmosis system and a second biological aerated filter, wherein sewage is treated by the physicochemical treatment unit to remove heavy metal ions, phosphate radical ions and suspended matters in the wastewater, the effluent of the physicochemical treatment unit flows into the hydrolysis acidification tank for degradation treatment, the effluent of the hydrolysis acidification tank flows into the MBR tank for purification treatment, the effluent of the MBR tank flows into the first biological aerated filter for purification treatment, the effluent of the first biological aerated filter flows into the activated carbon filter for removing residual chlorine, the effluent of the activated carbon filter flows into the reverse osmosis system for purification treatment, the produced water of the reverse osmosis system is recycled, and the concentrated solution of the reverse osmosis system flows into the second biological aerated filter for purification treatment.
Compared with the prior art, the metal surface coating waste water recycling system of this application, according to the rivers direction, includes: the device comprises a physicochemical treatment unit, a hydrolysis acidification tank, an MBR tank, a first biological aerated filter, an activated carbon filter, a reverse osmosis system and a second biological aerated filter, wherein polymer organic matters entering the reverse osmosis system are removed by means of the combined use of the MBR tank, the first biological aerated filter and the activated carbon filter, while an aerobic tank, a biological sedimentation tank and an Ultrafiltration (UF) system adopted in the prior art cannot completely degrade the polymer organic matters, so that the blockage of an RO membrane is avoided, the times of drug washing and the maintenance cost are reduced, and the service life of the RO membrane is prolonged. The concentrated water of the reverse osmosis system is purified by the second biological aerated filter, reaches the discharge standard, does not need to use a large amount of medicaments, reduces energy consumption and has simple process.
Preferably, the physicochemical treatment unit comprises an oil removal tank, a first pH adjusting tank, a coagulation tank, a flocculation tank, a sedimentation tank and a second pH adjusting tank, wherein the sewage is subjected to grease removal in the oil removal tank, the effluent of the oil removal tank flows into the first pH adjusting tank and is adjusted to be alkaline, the effluent of the first pH adjusting tank sequentially passes through the coagulation tank, the flocculation tank and the sedimentation tank for treatment, and the effluent of the sedimentation tank flows into the second pH adjusting tank and is adjusted to be neutral.
Preferably, an aerobic tank is arranged between the hydrolysis acidification tank and the MBR tank.
Preferably, the sludge generated by the MBR tank can partially flow back to the hydrolysis acidification tank.
Preferably, a UV sterilizer is arranged between the activated carbon filter and the reverse osmosis system.
Preferably, a first aeration device is arranged in the oil removing tank.
Preferably, a first water producing tank is arranged between the first biological aerated filter and the activated carbon filter, a first liquid level meter is arranged in the first water producing tank, and when the first liquid level meter detects that the liquid level in the first water producing tank reaches a preset locus, the first conveying pump is driven to convey sewage to the activated carbon filter from the first water producing tank.
Preferably, the reverse osmosis system comprises a reverse osmosis membrane group, a high-pressure pump and a precision filter, and the effluent of the activated carbon filter sequentially flows into the precision filter, the high-pressure pump and the reverse osmosis membrane group for treatment.
Preferably, the metal surface coating wastewater recycling system further comprises a sludge concentration tank, and the sludge in the sedimentation tank and the sludge generated by the MBR tank are conveyed to the sludge concentration tank for treatment.
Drawings
FIG. 1 is a schematic structural view of a metal surface coating wastewater recycling system according to the present invention.
FIG. 2 is a schematic structural view of a sludge concentration tank shown in the system for recycling metal surface coating wastewater of the present invention.
Description of the symbols:
the metal surface coating wastewater recycling system 100 comprises a materialization treatment unit 10, an oil removal tank 11, a first aeration device 111, a first pH adjusting tank 12, a coagulation tank 13, a flocculation tank 14, a sedimentation tank 15, a second pH adjusting tank 16, a hydrolysis acidification tank 20, an aerobic tank 30, a first air blower 31, an MBR tank 40, a first biological aerated filter 50, a first water production tank 52, a first liquid level meter 521, a first delivery pump 53, an activated carbon filter 60, an UV sterilizer 62, a reverse osmosis system 70, a reverse osmosis membrane group 71, a high-pressure pump 73, a precision filter 75, a second biological aerated filter 80, a second water production tank 81, a sludge concentration tank 90, a compression pump 91 and a filter press 93.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the system 100 for recycling metal surface coating wastewater of the present application includes: the system comprises a materialization treatment unit 10, a hydrolysis acidification tank 20, an MBR tank 40, a first biological aerated filter 50, an active carbon filter 60, a reverse osmosis system 70 and a second biological aerated filter 80, wherein sewage is treated by the materialization treatment unit 10 to remove heavy metal ions, phosphate ions and suspended matters in the wastewater, the effluent of the materialization treatment unit 10 flows into the hydrolysis acidification tank 20 for degradation treatment, the effluent of the hydrolysis acidification tank 20 flows into the MBR tank 40 for purification treatment, the effluent of the MBR tank 40 flows into the first biological aerated filter 50 for purification treatment, the effluent of the first biological aerated filter 50 flows into the active carbon filter 60 for removal of residual chlorine, the effluent of the active carbon filter 60 flows into the reverse osmosis system 70 for purification treatment, the produced water of the reverse osmosis system 70 is recycled, and the concentrated solution of the reverse osmosis system 70 flows into the second biological aerated filter 80 for purification treatment.
Referring to fig. 1, the physical and chemical treatment unit 10 includes an oil removal tank 11, a first pH adjustment tank 12, a coagulation tank 13, a flocculation tank 14, a sedimentation tank 15, and a second pH adjustment tank 16, wherein the sewage is degreased in the oil removal tank 11, the effluent of the oil removal tank 11 flows into the first pH adjustment tank 12 and is adjusted to be alkaline by using sodium hydroxide, the effluent of the first pH adjustment tank 12 is sequentially treated by the coagulation tank 13, the flocculation tank 14, and the sedimentation tank 15, and the effluent of the sedimentation tank 15 flows into the second pH adjustment tank 16 and is adjusted to be neutral. Specifically, grease in the sewage is removed through the oil removal tank 11, then the sewage is adjusted to be alkaline in the first pH adjusting tank 12, a coagulant and a flocculant are respectively added into the coagulation tank 13 and the flocculation tank 14 to react to generate a precipitate, the precipitate is removed in the sedimentation tank 15, and heavy metal ions in the wastewater and phosphate ions and suspended matters in the water are removed through the above treatment. The effluent from the sedimentation tank 15 flows into a second pH adjusting tank 16 and is adjusted to be neutral by sulfuric acid. Further, be equipped with first aeration equipment 111 in the deoiling pond 11, start first aeration equipment 111 and carry out the aeration with the homogeneous mixing sewage for the play water quality of water of deoiling pond 11 is even stable, avoids the adjusting error of pH value in the first pH equalizing basin 12.
Referring to fig. 1, an aerobic tank 30 is disposed between the hydrolysis acidification tank 20 and the MBR tank 40, that is, the effluent of the hydrolysis acidification tank 20 flows into the aerobic tank 30 for purification treatment, and the effluent of the aerobic tank 30 flows into the MBR tank 40 for purification treatment, so that the water quality is purified by the microorganisms in the aerobic tank 30. In this embodiment, the aerobic tank 30 is supplied with oxygen by a first blower 31. The sludge generated by the MBR tank 40 can partially flow back to the hydrolysis acidification tank 20, so that the treatment effect of the hydrolysis acidification tank 20 is improved.
Referring to fig. 1, the reverse osmosis system 70 includes a reverse osmosis membrane module 71, a high pressure pump 73, and a precision filter 75, and the effluent of the activated carbon filter 60 flows into the precision filter 75, the high pressure pump 73, and the reverse osmosis membrane module 71 in sequence for treatment. The precision filter 75 can filter sewage, prevent micro particles in the water from entering the reverse osmosis membrane group 71, and prolong the service life of the reverse osmosis membrane group 71. The high-pressure pump 73 can be used for quickly and effectively conveying the sewage to the reverse osmosis membrane group 71, so that the treatment efficiency is improved. Inorganic salts, organic matters, microorganisms, bacteria and the like in the water body are removed by the reverse osmosis membrane group 71. The produced water treated by the reverse osmosis membrane group 71 flows into a water production tank 77 to be reused in a workshop, and the concentrated solution treated by the reverse osmosis membrane group 71 flows into a second biological aerated filter 80. Further, a UV sterilizer 62 is arranged between the activated carbon filter 60 and the reverse osmosis system 70, the outlet water of the activated carbon filter 60 flows into the UV sterilizer 62, the outlet water of the UV sterilizer 62 flows into the reverse osmosis membrane group 71, and the UV sterilizer 62 sterilizes the sewage, so that the service life of the reverse osmosis membrane group 71 is prolonged.
Referring to fig. 1, the metal surface coating wastewater recycling system 100 further includes a sludge concentration tank 90, and the sludge in the sedimentation tank 15 and the sludge generated by the MBR tank 40 are delivered to the sludge concentration tank 90 for treatment. Specifically, the sludge in the sludge concentration tank 90 is sequentially treated by the compression pump 91 and the filter press 93 to obtain a sludge cake.
The working principle of the metal surface coating wastewater recycling system 100 of the present application is explained with reference to fig. 1:
the metal surface coating wastewater is conveyed to an oil removal tank 11, grease is removed from the oil removal tank 11, a first aeration device 111 is started to aerate to uniformly mix sewage, the effluent of the oil removal tank 11 is driven by a lift pump to flow into a first pH adjusting tank 12, the first pH adjusting tank 12 is adjusted to be alkaline by sodium hydroxide, the effluent of the first pH adjusting tank 12 flows into a coagulation tank 13 to be combined with a coagulant, the effluent of the coagulation tank 13 flows into a flocculation tank 14 to be combined with a flocculant, the effluent of the flocculation tank 14 flows into a sedimentation tank 15 for treatment, and the sludge in the sedimentation tank 15 is conveyed to a sludge concentration tank 90 to be treated by a compression pump 91 and a filter press 93 to obtain sludge cakes. The effluent of the sedimentation tank 15 flows into a second pH adjusting tank 16 to be adjusted to be neutral.
The effluent of the second pH adjusting tank 16 flows into a hydrolysis acidification tank 20, and the substances which are difficult to be biochemically degraded are degraded into substances which are easy to be biochemically degraded in the hydrolysis acidification tank 20. The effluent of the hydrolysis acidification tank 20 flows into the aerobic tank 30, and the water quality is purified by the microorganisms in the aerobic tank 30, specifically, the aerobic tank 30 is supplied with oxygen by the first blower 31. The effluent of the aerobic tank 30 flows into an MBR tank 40, and the activated sludge containing microbial flora in the MBR tank 40 adsorbs organic pollutants in the water body, so that the organic pollutants in the water body are decomposed to purify the water quality, a secondary sedimentation tank 15 is not needed, the equipment is simple, the occupied space of the structure is small, the sludge yield is low, and the effluent quality is stable; wherein the MBR tank 40 is supplied with oxygen by a second blower. The sludge generated by the MBR tank 40 can partially flow back to the hydrolysis acidification tank 20, so that the treatment effect of the hydrolysis acidification tank 20 is improved, and meanwhile, the sludge generated by the MBR tank 40 can also be conveyed to the sludge concentration tank 90 to be treated by a compression pump 91 and a filter press 93 to obtain a sludge cake. The effluent of the MBR tank 40 flows into the first biological aerated filter 50, and the first biological aerated filter 50 adsorbs, oxidizes and decomposes organic matters which are difficult to degrade by a conventional biological method through a biological membrane formed on the surface of a filter material by organisms, and has a filtering function. The effluent of the first biological aerated filter 50 flows into the first water producing tank 52, when the first liquid level meter 521 detects that the liquid level in the first water producing tank 52 reaches a preset point, the first conveying pump 53 is driven to convey the sewage from the first water producing tank 52 to the activated carbon filter 60, and the activated carbon filter 60 adsorbs and removes pollutants such as organic matters remaining in the water and simultaneously removes residual chlorine in the sewage. The effluent of the activated carbon filter 60 flows into the UV sterilizer 62, the UV sterilizer 62 sterilizes the sewage, the effluent of the UV sterilizer 62 flows into the precision filter 75 for filtration, the effluent of the precision filter 75 flows into the high-pressure pump 73, the sewage can be quickly and effectively conveyed to the reverse osmosis membrane group 71 by virtue of the high-pressure pump 73, and inorganic salts, organic matters, microorganisms, bacteria and the like in the water body are removed by virtue of the reverse osmosis membrane group 71. The produced water treated by the reverse osmosis membrane group 71 flows into a water production tank 77 to be reused in a workshop, and the concentrated solution treated by the reverse osmosis membrane group 71 flows into the second biological aerated filter 80 to be purified. The effluent of the second biological aerated filter 80 flows into a second water production tank 81, and the wastewater is discharged after reaching the standard through monitoring.
Compared with the prior art, the metal surface coating waste water recycling system 100 of the application includes according to the rivers direction: the physicochemical treatment unit 10, the hydrolysis acidification tank 20, the MBR tank 40, the first biological aerated filter 50, the activated carbon filter 60, the reverse osmosis system 70 and the second biological aerated filter 80 remove the high molecular organic matters entering the reverse osmosis system 70 by means of the combined use of the MBR tank 40, the first biological aerated filter 50 and the activated carbon filter 60, but the aerobic tank 30, the biological sedimentation tank 15 and the Ultrafiltration (UF) system adopted by the prior art can not completely degrade the high molecular organic matters, so that the blockage of an RO membrane is avoided, the drug washing times and the maintenance cost are reduced, and the service life of the RO membrane is prolonged. The concentrated water of the reverse osmosis system 70 is purified by the second biological aerated filter 80, and is discharged after reaching the standard, a large amount of medicaments are not needed, the energy consumption is reduced, and the process is simple.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (9)
1. A metal surface coating wastewater recycling system is characterized by comprising: a physicochemical treatment unit, a hydrolysis acidification tank, an MBR tank, a first biological aerated filter, an activated carbon filter, a reverse osmosis system and a second biological aerated filter, wherein sewage is treated by the physicochemical treatment unit to remove heavy metal ions, phosphate radical ions and suspended matters in the wastewater, the effluent of the physicochemical treatment unit flows into the hydrolysis acidification tank for degradation treatment, the effluent of the hydrolysis acidification tank flows into the MBR tank for purification treatment, the effluent of the MBR tank flows into the first biological aerated filter for purification treatment, the effluent of the first biological aerated filter flows into the activated carbon filter for removing residual chlorine, the effluent of the activated carbon filter flows into the reverse osmosis system for purification treatment, the produced water of the reverse osmosis system is recycled, and the concentrated solution of the reverse osmosis system flows into the second biological aerated filter for purification treatment.
2. The metal surface coating wastewater recycling system according to claim 1, wherein the physical and chemical treatment unit comprises an oil removal tank, a first pH adjustment tank, a coagulation tank, a flocculation tank, a sedimentation tank and a second pH adjustment tank, wherein the oil removal tank removes grease from sewage, the effluent of the oil removal tank flows into the first pH adjustment tank and is adjusted to be alkaline, the effluent of the first pH adjustment tank sequentially passes through the coagulation tank, the flocculation tank and the sedimentation tank for treatment, and the effluent of the sedimentation tank flows into the second pH adjustment tank and is adjusted to be neutral.
3. The metal surface coating wastewater recycling system of claim 1, wherein an aerobic tank is provided between the hydrolysis acidification tank and the MBR tank.
4. The metal surface coating wastewater recycling system of claim 1, wherein the sludge generated by the MBR tank can partially flow back to the hydrolysis acidification tank.
5. The system for recycling metal surface coating wastewater according to claim 1, wherein a UV sterilizer is provided between the activated carbon filter and the reverse osmosis system.
6. The system for recycling metal surface coating wastewater according to claim 2, wherein a first aeration device is provided in the oil removal tank.
7. The metal surface coating wastewater recycling system according to claim 1, wherein a first water generating tank is provided between the first biological aerated filter and the activated carbon filter, a first liquid level meter is provided in the first water generating tank, and when the first liquid level meter detects that the liquid level in the first water generating tank reaches a preset point, the first conveying pump is driven to convey sewage from the first water generating tank to the activated carbon filter.
8. The recycling system of metal surface coating wastewater as claimed in claim 1, wherein the reverse osmosis system comprises a reverse osmosis membrane module, a high pressure pump and a precision filter, and effluent of the activated carbon filter sequentially flows into the precision filter, the high pressure pump and the reverse osmosis membrane module for treatment.
9. The metal surface coating wastewater recycling system of claim 2, further comprising a sludge concentration tank, wherein the sludge in the sedimentation tank and the sludge generated by the MBR tank are conveyed to the sludge concentration tank for treatment.
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| CN202010336432.5A CN111348812A (en) | 2020-04-24 | 2020-04-24 | Metal surface coating wastewater recycling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113072261A (en) * | 2021-04-22 | 2021-07-06 | 广东瑞星环境科技有限公司 | Advanced treatment method for textile printing and dyeing wastewater |
| CN114506979A (en) * | 2022-02-24 | 2022-05-17 | 合肥凯华环保科技有限公司 | Zero-discharge integrated equipment for coating wastewater |
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2020
- 2020-04-24 CN CN202010336432.5A patent/CN111348812A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113072261A (en) * | 2021-04-22 | 2021-07-06 | 广东瑞星环境科技有限公司 | Advanced treatment method for textile printing and dyeing wastewater |
| CN114506979A (en) * | 2022-02-24 | 2022-05-17 | 合肥凯华环保科技有限公司 | Zero-discharge integrated equipment for coating wastewater |
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