CN116375296A - Water paint wastewater treatment method and water paint wastewater treatment equipment - Google Patents
Water paint wastewater treatment method and water paint wastewater treatment equipment Download PDFInfo
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- CN116375296A CN116375296A CN202310588698.2A CN202310588698A CN116375296A CN 116375296 A CN116375296 A CN 116375296A CN 202310588698 A CN202310588698 A CN 202310588698A CN 116375296 A CN116375296 A CN 116375296A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 183
- 239000003973 paint Substances 0.000 title claims abstract description 100
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 22
- 239000002351 wastewater Substances 0.000 claims abstract description 98
- 238000005189 flocculation Methods 0.000 claims abstract description 66
- 230000016615 flocculation Effects 0.000 claims abstract description 66
- 238000001179 sorption measurement Methods 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 46
- 238000000926 separation method Methods 0.000 claims abstract description 39
- 239000007800 oxidant agent Substances 0.000 claims abstract description 38
- 230000001590 oxidative effect Effects 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 32
- 239000002734 clay mineral Substances 0.000 claims abstract description 30
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 239000003513 alkali Substances 0.000 claims abstract description 18
- 239000008394 flocculating agent Substances 0.000 claims abstract description 7
- 239000010802 sludge Substances 0.000 claims description 38
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000001556 precipitation Methods 0.000 claims description 28
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 22
- 229920002401 polyacrylamide Polymers 0.000 claims description 22
- 239000003814 drug Substances 0.000 claims description 19
- 239000000440 bentonite Substances 0.000 claims description 16
- 229910000278 bentonite Inorganic materials 0.000 claims description 16
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 16
- 125000002091 cationic group Chemical group 0.000 claims description 12
- 125000000129 anionic group Chemical group 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 150000002505 iron Chemical class 0.000 claims description 8
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 7
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- 239000002585 base Substances 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 3
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 claims description 3
- 229910000020 calcium bicarbonate Inorganic materials 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 16
- 238000010924 continuous production Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 25
- 238000004042 decolorization Methods 0.000 description 16
- 238000012360 testing method Methods 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 14
- 239000007788 liquid Substances 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
- 239000002245 particle Substances 0.000 description 12
- 239000006228 supernatant Substances 0.000 description 11
- 150000003839 salts Chemical class 0.000 description 9
- 238000006555 catalytic reaction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 8
- 239000002023 wood Substances 0.000 description 7
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 6
- 239000000975 dye Substances 0.000 description 6
- 150000001298 alcohols Chemical class 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- 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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- 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
- C02F2101/32—Hydrocarbons, e.g. oil
-
- 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
- C02F2101/34—Organic compounds containing oxygen
-
- 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
- C02F2103/14—Paint wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
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- 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 application discloses a water paint wastewater treatment method and water paint wastewater treatment equipment, wherein the treatment method comprises the following steps: pumping an adsorption precipitant into the water paint wastewater, and stirring for a first preset time, wherein the adsorption precipitant comprises 100 parts of water, 0.02-4.8 parts of alkali and 20-80 parts of clay minerals according to parts by weight; pumping an oxidant into the water paint wastewater, and stirring for a second preset time; and (3) pumping a flocculating agent into the water paint wastewater, stirring for a third preset time, and then carrying out separation treatment. The treatment method has simple process and high COD removal efficiency. The flocculation and decoloration of the water paint wastewater can be completed only by adding the chemical and stirring, the COD removal rate can reach more than 80%, the raw water does not need to be subjected to pH value adjustment in advance, the energy consumption is low, and the automatic continuous production can be realized.
Description
Technical Field
The application relates to the technical field of environmental protection, in particular to a water paint wastewater treatment method and water paint wastewater treatment equipment.
Background
The water paint has the advantages of good water solubility, low emission of volatile organic compounds and the like, and has become the main development direction of the coating industry. However, the wastewater generated in the production process of the water-based paint contains organic matters such as pigment, alcohols and the like, and can form stable suspended matters in water bodies, so that the Chemical Oxygen Demand (COD) of the wastewater is up to 60000mg/L or more, the wastewater is difficult to decolorize, and the wastewater has poor biodegradability and is difficult to treat high-concentration wastewater.
The existing treatment method adopts the methods of air floatation, electrode catalysis, ozone catalysis and biochemical treatment, and the treated spraying wastewater can be recycled, but the process is complex and the corresponding equipment cost is higher.
Disclosure of Invention
Aiming at the technical problems, the application provides a water paint wastewater treatment method and water paint wastewater treatment equipment, which can solve the problems of complex process and high cost of the existing treatment method.
To solve the above technical problems, in a first aspect, an embodiment of the present application provides a method for treating water paint wastewater, including:
pumping an adsorption precipitant into the water paint wastewater, and stirring for a first preset time, wherein the adsorption precipitant comprises 100 parts of water, 0.02-4.8 parts of alkali and 20-80 parts of clay minerals according to parts by weight;
pumping an oxidant into the water paint wastewater, and stirring for a second preset time;
and (3) pumping a flocculating agent into the water paint wastewater, stirring for a third preset time, and then carrying out separation treatment.
Optionally, the oxidant is a mixture aqueous solution of persulfate and ferric salt.
Optionally, the ratio of the adding amount of the persulfate to the adding amount of the iron salt is (1-1.6) by weight: 1.
optionally, the iron salt comprises one or more of ferric sulfate, ferrous sulfate, and polymeric ferric sulfate.
Optionally, the clay mineral comprises one or more of kaolin, montmorillonite and bentonite.
Optionally, the base includes one or more of sodium hydroxide, calcium hydroxide, sodium carbonate, sodium bicarbonate, and calcium bicarbonate.
Optionally, the flocculant is cationic polyacrylamide or anionic polyacrylamide.
In a second aspect, embodiments of the present application further provide an aqueous paint wastewater treatment apparatus, including:
the flocculation tank is used for carrying out flocculation reaction on the water paint wastewater to generate wastewater to be separated;
the first medicament tank is connected with the flocculation tank and is used for pumping an adsorption and precipitation agent into the flocculation tank, wherein the adsorption and precipitation agent comprises 100 parts of water, 0.02-4.8 parts of alkali and 20-80 parts of clay mineral according to parts by weight;
a second medicament tank connected with the flocculation tank for pumping an oxidant into the flocculation tank;
a third medicament tank connected with the flocculation tank and used for pumping flocculant into the flocculation tank;
and the separation device is connected with the flocculation tank and is used for separating the wastewater to be separated.
Optionally, the separation device includes:
the sludge collection assembly is used for collecting sludge;
a separation pipe, which is arranged in an inclined way and comprises a first end and a second end higher than the first end; the first end is connected with the flocculation tank, the second end is arranged above the sludge collection assembly, meshes are arranged at the bottom of the separation pipeline, and the wastewater to be separated is filtered out from the meshes after entering the separation pipeline;
the screw rod is sleeved in the separation pipeline, and pushes the sludge filtered out by the wastewater to be separated to the second end when the screw rod rotates so as to be discharged into the sludge collection assembly.
Optionally, the sludge collection assembly includes:
the collecting funnel is arranged right below the second end, and an outlet of the collecting funnel is provided with an openable cover plate;
and the sludge collecting tank is arranged right below the outlet of the collecting hopper and is used for storing sludge.
As described above, the method for treating the water-based paint wastewater comprises the steps of pumping an oxidant and an adsorption precipitant into the water-based paint wastewater, oxidizing long carbon chain organic matters into short carbon chain matters by the oxidant, adsorbing small molecular dyes, short carbon chain matters and the like in the water-based paint wastewater by the adsorption precipitant, pumping a flocculating agent, gathering and precipitating clay mineral particles adsorbed with the small molecular dyes, alcohol organic matters, short carbon chain matters and the like, and finally separating the precipitate from water, thereby completing the purification treatment of the water-based paint wastewater. Compared with the traditional method, the processing method of the embodiment has the following advantages: and (1) the process is simple, and the COD removal efficiency is high. The flocculation and decoloration can be completed in the water paint wastewater with COD of more than 60000mg/L only by adding medicine and stirring, and the COD removal rate can be more than 80%; the raw water (water paint wastewater) can be added with medicine to carry out flocculation decolorization process without adjusting the pH value of acid and alkali in advance. And (2) the energy consumption is low. Compared with the processes of electrolysis, ozone catalysis and the like, the process has the advantages of quick flocculation and decoloration reaction and low power consumption. (3) the process running cost is relatively low. Compared with the processes of electrolysis, ozone catalysis and the like, the process does not need to consider the problems of electrode or catalyst loss, and is simpler to operate and maintain. (4) can realize automatic continuous production. The clay mineral is prepared into the aqueous solution medicament with higher concentration by adding alkali, so that the automatic production of the aqueous paint wastewater treatment is realized, and the cost is lower.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a method for treating water paint wastewater provided in an embodiment of the application;
fig. 2 is a schematic structural diagram of an apparatus for treating water paint wastewater according to an embodiment of the present application;
FIG. 3 is a schematic structural view of another water paint wastewater treatment apparatus provided in an embodiment of the present application;
FIG. 4 is a schematic structural view of a separation device according to an embodiment of the present disclosure;
fig. 5 is a schematic structural view of a rotary brush according to an embodiment of the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings. Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.
Detailed Description
The water paint has the advantages of good water solubility, low emission of volatile organic compounds and the like, and has become the main development direction of the coating industry. However, the wastewater generated in the production process of the water-based paint contains organic matters such as pigment, alcohols and the like, and can form stable suspended matters in water bodies, so that the Chemical Oxygen Demand (COD) of the wastewater is up to 60000mg/L or more, the wastewater is difficult to decolorize, and the wastewater has poor biodegradability and is difficult to treat high-concentration wastewater. The existing treatment method adopts the methods of air floatation, electrode catalysis, ozone catalysis and biochemical treatment, and the treated spraying wastewater can be recycled, but the process is complex and the corresponding equipment cost is higher. Based on the above, the application provides a treatment method of water paint wastewater and water paint wastewater treatment equipment.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for treating water paint wastewater according to an embodiment of the present application, where the method includes:
s101, pumping an adsorption precipitant into the water paint wastewater, and stirring for a first preset time, wherein the adsorption precipitant comprises 100 parts of water, 0.02-4.8 parts of alkali and 20-80 parts of clay minerals according to parts by weight.
S102, pumping an oxidant into the water paint wastewater, and stirring for a second preset time.
In this embodiment, step S102 may be performed first, and then step S101 may be performed. The aqueous paint wastewater contains long carbon chain organic matters, alcohols and other organic matters, an oxidant and an adsorption precipitant are sequentially pumped into the aqueous paint wastewater and are respectively stirred, the oxidant can oxidize the long carbon chain organic matters into short carbon chain matters, and the adsorption precipitant can adsorb small molecular dyes, alcohols and short carbon chain matters in the aqueous paint wastewater.
It should be noted that, the adsorption precipitant may be clay mineral conventional in the art, such as kaolin, and may be manually operated to directly add clay mineral into the aqueous paint wastewater, but for industrial production, the manual operation efficiency is low and the cost is high. Because clay minerals have larger viscosity, have smaller solubility in water and are difficult to disperse, a large amount of water is needed for dissolution when the pump is quantitatively pumped in the step S101, and water resources are wasted.
The embodiment provides a better scheme, the adsorption precipitant comprises 100 parts of water, 0.02-4.8 parts of alkali and 20-80 parts of clay mineral according to parts by weight, wherein the clay mineral plays a role in adsorption, and the applicant finds that the viscosity of the clay mineral can be effectively reduced and the dispersibility/solubility of the clay mineral in water can be improved by about 10 times due to the fact that the solubility of the clay mineral in water is lower.
In the embodiment, the clay mineral is prepared into corresponding medicament, and the pumping amount of the adsorption precipitant can be controlled by a pump so as to carry out automatic production.
The oxidizing agent may be any agent conventionally used in the art, such as aluminum chloride, polyaluminum chloride, or the like. The embodiment of the present application is not particularly limited.
As one example, the base may include one or more of sodium hydroxide, calcium hydroxide, sodium carbonate, sodium bicarbonate, and calcium bicarbonate.
As one example, clay minerals include one or more of kaolin, montmorillonite, and bentonite.
As an example, the aqueous paint wastewater may be stirred for 10 to 60 seconds after the adsorption precipitant is pumped.
As an example, after the oxidant is pumped into the aqueous paint wastewater, the mixture may be stirred for 10 to 60 seconds.
S103, pumping a flocculating agent into the water paint wastewater, stirring for a third preset time, and then performing separation treatment.
Flocculant is also known as coagulant and refers to a chemical substance that can cause minute particles suspended in water to aggregate and precipitate rapidly. Are commonly used to treat suspended matter in water and sewage, to aggregate and agglomerate suspended particles in water to form larger clots or precipitates, thereby facilitating suspended matter separation and removal. These suspended particles are typically tiny particles that cannot be effectively removed by filters or other processing facilities. For example, chemical substances in the flocculant can interact with clay mineral particles in water, wherein small molecular dyes, alcohol organic matters and short carbon chain substances are adsorbed on the clay mineral particles, and the clay mineral particles are adsorbed on the surfaces of the clay mineral particles to form charged clay mineral particles. These charged clay mineral particles will attract each other and form larger agglomerates, eventually forming a precipitate. In this example, the flocculant may be an inorganic flocculant such as ferric chloride, aluminate, sulfate, etc., or an organic flocculant such as polyacrylamide (pam), etc., which are conventional in the art.
For example, the flocculant may be a cationic polyacrylamide or an anionic polyacrylamide. Compared with anionic polyacrylamide, the cationic polyacrylamide has better decoloring effect, but the selling price of the cationic polyacrylamide with the same molecular weight is 1.6-1.7 times that of the anionic polyacrylamide. Thus, the flocculant can be comprehensively selected according to the requirements of cost and decolorizing effect. As an example, an anionic polyacrylamide solution with a mass concentration of 0.1% to 0.5% may be selected as the flocculant.
As an example, after a flocculant is pumped into the aqueous paint wastewater, the wastewater may be stirred for 10 to 60 seconds and then subjected to a separation treatment.
In the embodiment, the oxidant and the adsorption precipitant are pumped into the water paint wastewater, the oxidant oxidizes the long carbon chain organic matters into short carbon chain substances, the adsorption precipitant can adsorb small molecular dyes, alcohol organic matters, short carbon chain substances and the like in the water paint wastewater, then the flocculant is pumped, clay mineral particles adsorbed with the small molecular dyes, the alcohol organic matters, the short carbon chain substances and the like are aggregated and precipitated, and finally the precipitate and water are separated, so that the purification treatment of the water paint wastewater is completed. Compared with the traditional method, the processing method of the embodiment has the following advantages:
(1) The process is simple, and the COD removal efficiency is high. The flocculation and decoloration can be completed in the water paint wastewater with COD of more than 60000mg/L only by adding medicine and stirring, and the COD removal rate can be more than 80%; the raw water (water paint wastewater) can be added with medicine to carry out flocculation decolorization process without adjusting the pH value of acid and alkali in advance.
(2) The energy consumption is low. Compared with the processes of electrolysis, ozone catalysis and the like, the process has the advantages of quick flocculation and decoloration reaction and low power consumption.
(3) The process running cost is relatively low. Compared with the processes of electrolysis, ozone catalysis and the like, the process does not need to consider the problems of electrode or catalyst loss, and is simpler to operate and maintain.
(4) Can realize automatic continuous production. The clay mineral is prepared into the aqueous solution medicament with higher concentration by adding alkali, so that the automatic production of the aqueous paint wastewater treatment is realized, and the cost is lower.
In one embodiment, the oxidizing agent may be an aqueous mixture of persulfate and iron salt. As some examples, the iron salt may include one or more of ferric sulfate, ferrous sulfate, and polymeric ferric sulfate. Fe (Fe) 2+ 、Fe 3+ The ion can activate persulfate in the water body under the condition of room temperature, and can be converted into sulfate radical with extremely strong oxidizing ability, so that organic matters are degraded. The adsorption precipitant in the water body not only can adsorb organic matters such as pigment and alcohols in the wastewater, but also can adsorb fine particles formed by products after oxidative degradation, and the fine particles are agglomerated into flocculates under the further action of a flocculating agent, so that flocculation and decolorization processes are completed.
In one embodiment, the ratio of the added amount of persulfate to iron salt is (1 to 1.6) by weight: 1. the persulfate is expensive, so the proportion of persulfate is reduced as much as possible. The ratio of the addition amount of persulfate to ferric salt is 1 at minimum: 1, so as to prevent the oxidation efficiency from being influenced by too little persulfate.
The embodiment of the application also provides an apparatus for treating water paint wastewater, referring to fig. 2, the apparatus for treating water paint wastewater may include a flocculation tank 10, a first chemical tank 20, a second chemical tank 30, a third chemical tank 40, and a separation device 50.
The first chemical tank 20, the second chemical tank 30, the third chemical tank 40, and the separation device 50 are connected to the flocculation tank 10, respectively. The first medicament tank 20 is used for pumping an adsorption precipitant into the flocculation tank 10, wherein the adsorption precipitant comprises 100 parts of water, 0.02-4.8 parts of alkali and 20-80 parts of clay mineral according to parts by weight; the second medicament tank 30 is used for pumping an oxidizing agent into the flocculation tank 10; the third agent tank 40 is used for pumping a flocculant into the flocculation tank 10; the flocculation tank 10 is used for carrying out flocculation reaction on water paint wastewater to generate wastewater to be separated, and a stirrer 11 can be arranged in the flocculation tank 10 to stir the liquid in the flocculation tank 10; the separating device 50 is used for separating the wastewater to be separated.
For example, aqueous paint wastewater may be added to flocculation tank 10 and an adsorption precipitant may be pumped into flocculation tank 10 through first reagent tank 20 and stirred for 40 seconds; then pumping an oxidant into the flocculation tank 10 through the second medicament tank 30, and stirring for 35s; pumping a flocculating agent into the flocculation tank 10 through a third medicament tank 40, and stirring for 40s to form wastewater to be separated; finally, the wastewater to be separated in the flocculation tank 10 is pumped into the separation device 50, and the precipitate in the wastewater is separated to finish the treatment of the water-based paint wastewater. According to the water paint wastewater treatment equipment, as clay minerals are prepared into a medicament with higher concentration through alkali, the adding amount of the adsorption precipitant can be controlled by adopting the pump, so that the water paint wastewater treatment equipment can perform automatic treatment.
As some examples, a sewage tank 100 may be provided to store the aqueous paint wastewater, and the sewage tank 100 is connected to the flocculation tank 10, so as to continuously add the aqueous paint wastewater to the flocculation tank 10, thereby realizing continuous automatic production. In addition, in order to prolong the reaction time of the liquid medicine and the water paint wastewater, and buffer the reacted water paint wastewater to realize continuous automatic production, please refer to fig. 3, fig. 3 is a schematic structural diagram of another water paint wastewater treatment device provided in this embodiment, and a first water storage tank 60 may be further disposed between the flocculation tank 10 and the separation device 50, that is, the separation device 50 is indirectly connected with the flocculation tank 10 through the first water storage tank 60.
In one embodiment, the present application provides a separation device, referring to fig. 4, fig. 4 is a schematic structural diagram of a separation device provided in an embodiment of the present application, and the separation device 50 may include a sludge collection assembly 51, a separation pipe 52, and a screw 53. The sludge collection assembly 51 is used for collecting sludge; the separation pipe 52 is disposed obliquely. The separation conduit 52 may include a first end 521 and a second end 522, and the second end 522 is higher than the first end 521, e.g., the separation conduit 52 may be disposed at an angle of 30 ° relative to horizontal; the first end 521 is connected to the flocculation tank 10, the second end 522 is arranged above the sludge collection assembly 51, and the bottom of the separation pipe 52 is provided with meshes (not shown in the figure), from which the wastewater to be separated is filtered out after entering the separation pipe 52. As an example, a second water storage tank 54 may be provided under the mesh of the separation pipe 52 to collect filtered water. The screw 53 is sleeved in the separation pipeline 52, the screw 53 can be driven by the motor 55, and the screw 53 pushes the sludge filtered out by the wastewater to be separated to the second end 522 when rotating so as to be discharged into the sludge collection assembly 51, so that dry-wet separation is realized.
In one embodiment, the present application provides a sludge collection assembly, with continued reference to fig. 4, the sludge collection assembly 51 may include a collection funnel 511, a sludge collection tank 512, and a cover plate 513. The collection funnel 511 is disposed directly under the second end 522, and the cover plate 513 is openably disposed at the outlet of the collection funnel 511, and the sludge collection tank 512 is disposed directly under the outlet of the collection funnel 511 for storing sludge. For example, the cover 513 may be coupled in a flip-type manner, but this solution requires a large operation space. Preferably, the cover 513 is rotatably connected to the outlet of the collection funnel 511.
In operation, the cover 513 is kept open and the sludge is continually forced by the screw 53 to fall from the second end 522 of the separation conduit 52 into the collection hopper 511 and eventually into the sludge collection tank 512. When it is desired to clean the sludge collection tank 512, the lid 513 may be closed, the collection hopper 511 may be used as a temporary reservoir for sludge, and the lid 513 may be opened after a new sludge collection tank 512 is placed under the collection hopper 511. The sludge collection assembly of the present embodiment can ensure continuous production, and can improve the treatment efficiency, avoiding the stop of production due to the cleaning of the sludge collection tank 512.
In one embodiment, please continue to refer to fig. 4 and 5, fig. 5 is a schematic structural diagram of a rotary brush according to an embodiment of the present application. The sludge collection assembly 51 may also include a rotating brush 514 for cleaning the residual sludge on the inner wall of the collection funnel 511. As one example, the rotating brush 514 may include a rotating shaft 5141, a connecting rod 5142, and two brush plates 5143. The rotation shaft 5141 is disposed at the center of the collection funnel 511, the rotation shaft 5141 is connected to the middle point of the connection rod 5142, the two brush plates 5143 are disposed at both ends of the connection rod 5142, respectively, and the brush plates 5143 are disposed in parallel with the inner wall of the collection funnel 511 at a spacing, for example, the two brush plates 5143 are substantially V-shaped. The rotation shaft 5141 may be driven to rotate by a motor, and the brush plate 5143 cleans the inner wall of the collecting hopper 511 by the driving of the connection rod 5142.
As some examples, the working surface of the brush plate 5143 may be provided with bristles, but the bristles are softer for cleaning sludge. Preferably, a plurality of protrusions may be provided at a side of the brush plate 5143 facing the inner wall of the collecting hopper 511 to increase the cleaning force of the brush plate 5143 against the sludge. The plurality of protrusions are preferably uniformly distributed on the surface of the brush plate 5143. In addition, the surface of the protrusion is preferably rounded to avoid scratching the inner wall of the collection funnel 511 when the protrusion contacts the inner wall of the collection funnel 511.
As some examples, with continued reference to fig. 3, the aqueous paint wastewater treatment apparatus may further include a third water storage tank 70 and an advanced oxidation device 80 connected in series with the separation device 50. The advanced oxidation device 80 is used for performing oxidation treatment on the water separated by the separation device 50 to further purify the water separated by the separation device 50.
The present application is further illustrated by the following examples. Before each example of the water paint wastewater (raw water) experiment, firstly detecting the pH value, COD value and turbidity of the raw water; after the reaction is finished, standing for 5 minutes, and taking supernatant to measure the pH value, the COD value and the turbidity; the purification and decolorization effect is to measure COD in the wastewater according to HJ 828-2017 'determination of water quality chemical oxygen demand dichromate method' and to measure turbidity in the wastewater according to GB 13200-91 'determination of water quality turbidity'.
Example 1
(1) 500ml of raw water of automobile water paint production wastewater of a certain coating company is taken, an adsorption and precipitation agent which is 0.02 times of the raw water volume (namely 10 ml) is added into the raw water, and the mixture is stirred for 1 minute, wherein the adsorption and precipitation agent comprises the following components in parts by weight: 100 parts of water, 1.6 parts of sodium hydroxide and 40 parts of bentonite.
(2) Adding an oxidant with the mass concentration of 20% which is 0.02 times of the volume of raw water (namely 10 ml) into the raw water, and stirring for 1 minute, wherein the weight ratio of persulfate to ferric salt in the oxidant is 1:1.
(3) An anionic polyacrylamide solution with the mass concentration of 0.5 percent and the volume (namely 5 ml) of the raw water which is 0.01 times that of the raw water is added into the raw water, the mixture is stirred for 1 minute to generate flocculation precipitation and decoloration, the supernatant liquid is colorless transparent liquid, and the test results are shown in table 1.
Table 1 example 1 data of test before and after flocculation and decolorization of aqueous paint wastewater
Example 2
(1) 500ml of raw water of the wood water paint production wastewater generated in a paint production workshop is taken, an adsorption and precipitation agent which is 0.11 times the volume of the raw water (namely 55 ml) is added into the raw water, and the raw water is stirred for 1 minute, wherein the adsorption and precipitation agent comprises the following components in parts by weight: 100 parts of water, 1.6 parts of sodium hydroxide and 40 parts of bentonite.
(2) Adding an oxidant with the mass concentration of 20% which is 0.03 times of the volume of raw water (namely 15 ml) into the raw water, and stirring for 1 minute, wherein the weight ratio of persulfate to ferric salt in the oxidant is 1:1.
(3) To the raw water was added an anionic polyacrylamide solution having a mass concentration of 0.5% which was 0.02 times the volume of the raw water (i.e., 10 ml), and after stirring for 1 minute, flocculation precipitation and decolorization occurred, and the supernatant was colorless transparent liquid, and the test results are shown in Table 2.
Table 2 example 2 data of test of water paint wastewater before and after flocculation decolorization
Example 3 (first oxidant and then adsorption precipitant)
(1) 500ml of raw water of the wood water paint production wastewater generated in a paint production workshop is taken, an oxidant with the mass concentration of 20% which is 0.03 times of the volume of the raw water (namely 15 ml) is added into the raw water, and the mixture is stirred for 1 minute, wherein the weight ratio of persulfate to ferric salt in the oxidant is 1:1.
(2) Adding an adsorption and precipitation agent which is 0.1 times of the volume of raw water (namely 50 ml) into the raw water, and stirring for 1 minute, wherein the adsorption and precipitation agent comprises the following components in parts by weight: 100 parts of water, 1.6 parts of sodium hydroxide and 40 parts of bentonite.
(3) To the raw water was added an anionic polyacrylamide solution having a mass concentration of 0.1% which was 0.1 times the volume of the raw water (i.e., 50 ml), and after stirring for 1 minute, flocculation precipitation and decolorization occurred, and the supernatant was colorless transparent liquid, and the test results are shown in Table 3.
Table 3 example 3 data of test before and after flocculation decolorization of aqueous paint wastewater
Example 4 (cationic Polyacrylamide)
(1) 500ml of raw water of the wood water paint production wastewater generated in a paint production workshop is taken, an adsorption and precipitation agent which is 0.14 times the volume of the raw water (namely 70 ml) is added into the raw water, and the raw water is stirred for 1 minute, wherein the adsorption and precipitation agent comprises the following components in parts by weight: 100 parts of water, 1.6 parts of sodium hydroxide and 40 parts of bentonite.
(2) Adding an oxidant with the mass concentration of 20% which is 0.04 times that of the raw water (namely 20 ml) into the raw water, and stirring for 1 minute, wherein the weight ratio of persulfate to ferric salt in the oxidant is 1:1.
(3) To the raw water, 0.12 times of the cationic polyacrylamide solution with the volume (namely 60 ml) of the raw water and the mass concentration of 0.5% was added, and after stirring for 1 minute, flocculation precipitation and decoloration occurred, the supernatant liquid was colorless transparent liquid, and the test results are shown in Table 4.
Table 4 example 4 data of test of the water paint wastewater before and after flocculation decolorization
Comparative example 1 (no persulfate in the oxidizer)
(1) 500ml of raw water of the wood water paint production wastewater generated in a paint production workshop is taken, an adsorption and precipitation agent which is 0.14 times the volume of the raw water (namely 70 ml) is added into the raw water, and the raw water is stirred for 1 minute, wherein the adsorption and precipitation agent comprises the following components in parts by weight: 100 parts of water, 1.6 parts of sodium hydroxide and 40 parts of bentonite.
(2) To the raw water was added a 10% strength by mass solution of polymeric ferric sulfate in an amount of 0.08 times the raw water volume (i.e., 40 ml), and stirred for 1 minute.
(3) To the raw water was added a cationic polyacrylamide solution having a mass concentration of 0.5% which was 0.12 times the volume of the raw water (i.e., 60 ml), and after stirring for 1 minute, it was allowed to stand still, the supernatant was a dark purple turbid liquid, and a small amount of precipitate was present at the bottom, and the test results are shown in Table 5.
Table 5 comparative example 1 data of test before and after flocculation decolorization of aqueous paint wastewater
Comparative example 2 (persulfate excess in oxidant)
(1) 500ml of raw water of the wood water paint production wastewater generated in a paint production workshop is taken, an adsorption and precipitation agent which is 0.14 times the volume of the raw water (namely 70 ml) is added into the raw water, and the raw water is stirred for 1 minute, wherein the adsorption and precipitation agent comprises the following components in parts by weight: 100 parts of water, 1.6 parts of sodium hydroxide and 40 parts of bentonite.
(2) Adding an oxidant with the mass concentration of 10% which is 0.04 times of the volume of raw water (namely 20 ml) into the raw water, and stirring for 1 minute, wherein the weight ratio of persulfate to ferric salt in the oxidant is 3:1.
(3) To the raw water, 0.12 times of the cationic polyacrylamide solution with the volume (60 ml) of the raw water and the mass concentration of 0.5% was added, and after stirring for 1 minute, flocculation precipitation and decoloration occurred, the supernatant was colorless transparent liquid, and a small amount of precipitate was present at the bottom, and the test results are shown in Table 6.
Table 6 comparative example 2 data of test before and after flocculation decolorization of aqueous paint wastewater
Comparative example 3 (adsorption precipitant without alkali)
(1) 500ml of raw water of the wood water paint production wastewater generated in a paint production workshop is taken, an adsorption and precipitation agent which is 0.6 times of the raw water volume (namely 300 ml) is added into the raw water, and the mixture is stirred for 1 minute, wherein the adsorption and precipitation agent comprises the following components in parts by weight: 100 parts of water and 5 parts of bentonite.
(2) Adding an oxidant with the mass concentration of 20% which is 0.04 times that of the raw water (namely 20 ml) into the raw water, and stirring for 1 minute, wherein the weight ratio of persulfate to ferric salt in the oxidant is 1:1.
(3) To the raw water was added a cationic polyacrylamide solution having a mass concentration of 0.5% which was 0.13 times the volume of the raw water (i.e., 65 ml), and after stirring for 1 minute, flocculation precipitation and decolorization occurred, and the supernatant was colorless transparent liquid, and the test results are shown in Table 7.
Table 7 comparative example 3 data of test before and after flocculation decolorization of aqueous paint wastewater
Comparative example 4 (adsorption of excess alkali in precipitant)
(1) 500ml of raw water of the wood water paint production wastewater generated in a paint production workshop is taken, an adsorption and precipitation agent which is 0.08 times the volume of the raw water (namely 40 ml) is added into the raw water, and the raw water is stirred for 1 minute, wherein the adsorption and precipitation agent comprises the following components in parts by weight: 100 parts of water, 2.4 parts of sodium hydroxide and 40 parts of bentonite.
(2) Adding an oxidant with the mass concentration of 10% which is 0.04 times of the volume of raw water (namely 20 ml) into the raw water, and stirring for 1 minute, wherein the weight ratio of persulfate to ferric salt in the oxidant is 1:1.
(3) Cationic polyacrylamide solution with 0.13 times of the raw water volume (namely 65 ml) and 0.5% of mass concentration is added into the raw water, flocculation precipitation and decoloration occur after stirring for 1 minute, the supernatant is colorless transparent liquid, but the decoloration effect is poor, and the test result is shown in Table 8.
Table 8 comparative example 4 data of test before and after flocculation decolorization of aqueous paint wastewater
Analysis of results
The flocculation and decoloration of the water paint wastewater can be completed in the examples 1-4, the COD removal rate can reach more than 80%, and in the treatment process, the raw water does not need to be subjected to acid-base regulation, and the flocculation and decoloration process can be performed by adding the agent.
In comparative example 1, since the oxidizing agent does not contain persulfate, the oxidizing ability is lowered, and the decomposition of long carbon chain organic matters is insufficient, so that the flocculation decoloring effect is poor, the supernatant liquid is still cloudy, and deep purple is exhibited.
In comparative example 2, the excessive persulfate causes small flocs and poor precipitation effect, which is unfavorable for separating supernatant from the flocs.
In comparative example 3, the adsorption precipitant had been thick and sticky when no alkali was added to the adsorption precipitant, resulting in bentonite of 5% relative to water (40% in examples 1-4), which would seriously affect the performance of the dosing pump and would be detrimental to automated production. The flocculation decolorization effect is hardly affected by the addition of alkali, mainly affecting the configuration of bentonite agents and further affecting the automatic production.
In comparative example 4, the added alkali is excessive, and the mass ratio of sodium hydroxide to bentonite reaches 0.06:1, resulting in too high pH of the mixture after dosing. In the case of the same addition amount of the oxidizing agent and the cationic polyacrylamide solution, the decoloring effect of comparative example 4 was inferior to that of comparative example 3. Experiments prove that the mass ratio of the sodium hydroxide to the bentonite is 0.04:1, the bentonite can obtain better solubility.
The method and equipment for treating the water paint wastewater provided by the application are described in detail, and specific examples are used for illustrating the principles and the implementation modes of the application. In this application, the descriptions of the embodiments are focused on, and the details or descriptions of one embodiment may be referred to as related descriptions of other embodiments.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (10)
1. The method for treating the water paint wastewater is characterized by comprising the following steps of:
pumping an adsorption precipitant into the water paint wastewater, and stirring for a first preset time, wherein the adsorption precipitant comprises 100 parts of water, 0.02-4.8 parts of alkali and 20-80 parts of clay minerals according to parts by weight;
pumping an oxidant into the water paint wastewater, and stirring for a second preset time;
and (3) pumping a flocculating agent into the water paint wastewater, stirring for a third preset time, and then carrying out separation treatment.
2. The process of claim 1, wherein the oxidizing agent is an aqueous mixture of persulfate and iron salt.
3. The method according to claim 2, wherein the ratio of the added amounts of persulfate and iron salt is (1 to 1.6) by weight: 1.
4. the process of claim 2, wherein the iron salt comprises one or more of ferric sulfate, ferrous sulfate, and polymeric ferric sulfate.
5. The process of claim 1, wherein the clay mineral comprises one or more of kaolin, montmorillonite, and bentonite.
6. The process of claim 1, wherein the base comprises one or more of sodium hydroxide, calcium hydroxide, sodium carbonate, sodium bicarbonate, and calcium bicarbonate.
7. The process of claim 1, wherein the flocculant is a cationic polyacrylamide or an anionic polyacrylamide.
8. An aqueous paint wastewater treatment apparatus, comprising:
the flocculation tank is used for carrying out flocculation reaction on the water paint wastewater to generate wastewater to be separated;
the first medicament tank is connected with the flocculation tank and is used for pumping an adsorption and precipitation agent into the flocculation tank, wherein the adsorption and precipitation agent comprises 100 parts of water, 0.02-4.8 parts of alkali and 20-80 parts of clay mineral according to parts by weight;
a second medicament tank connected with the flocculation tank for pumping an oxidant into the flocculation tank;
a third medicament tank connected with the flocculation tank and used for pumping flocculant into the flocculation tank;
and the separation device is connected with the flocculation tank and is used for separating the wastewater to be separated.
9. The water paint wastewater treatment apparatus as claimed in claim 8, wherein the separating means comprises:
the sludge collection assembly is used for collecting sludge;
a separation pipe, which is arranged in an inclined way and comprises a first end and a second end higher than the first end; the first end is connected with the flocculation tank, the second end is arranged above the sludge collection assembly, meshes are arranged at the bottom of the separation pipeline, and the wastewater to be separated is filtered out from the meshes after entering the separation pipeline;
the screw rod is sleeved in the separation pipeline, and pushes the sludge filtered out by the wastewater to be separated to the second end when the screw rod rotates so as to be discharged into the sludge collection assembly.
10. The water paint wastewater treatment apparatus of claim 9 wherein the sludge collection assembly comprises:
the collecting funnel is arranged right below the second end, and an outlet of the collecting funnel is provided with an openable cover plate;
and the sludge collecting tank is arranged right below the outlet of the collecting hopper and is used for storing sludge.
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