CN113402095A - Waste-free recycling treatment process for printing ink wastewater - Google Patents
Waste-free recycling treatment process for printing ink wastewater Download PDFInfo
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- CN113402095A CN113402095A CN202110574653.0A CN202110574653A CN113402095A CN 113402095 A CN113402095 A CN 113402095A CN 202110574653 A CN202110574653 A CN 202110574653A CN 113402095 A CN113402095 A CN 113402095A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000004064 recycling Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000010802 sludge Substances 0.000 claims abstract description 51
- 239000006228 supernatant Substances 0.000 claims abstract description 48
- 230000003647 oxidation Effects 0.000 claims abstract description 40
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 40
- 239000013049 sediment Substances 0.000 claims abstract description 29
- 150000003839 salts Chemical class 0.000 claims abstract description 26
- 230000003197 catalytic effect Effects 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 21
- 238000004062 sedimentation Methods 0.000 claims abstract description 18
- 238000001556 precipitation Methods 0.000 claims abstract description 17
- 230000001112 coagulating effect Effects 0.000 claims abstract description 16
- 238000005189 flocculation Methods 0.000 claims abstract description 16
- 230000016615 flocculation Effects 0.000 claims abstract description 16
- 238000001704 evaporation Methods 0.000 claims abstract description 14
- 230000001699 photocatalysis Effects 0.000 claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 10
- 239000002244 precipitate Substances 0.000 claims abstract description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 20
- 239000000706 filtrate Substances 0.000 claims description 15
- 239000000701 coagulant Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 239000003245 coal Substances 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 239000012065 filter cake Substances 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 9
- 238000005345 coagulation Methods 0.000 claims description 6
- 230000015271 coagulation Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000003311 flocculating effect Effects 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 238000005286 illumination Methods 0.000 claims description 4
- 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 4
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
- 229910001448 ferrous ion Inorganic materials 0.000 claims description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 3
- 238000001471 micro-filtration Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 5
- 239000007787 solid Substances 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 239000000976 ink Substances 0.000 description 56
- 230000000694 effects Effects 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000005406 washing Methods 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000001276 controlling 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
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- 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
-
- 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
-
- 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
- C02F1/54—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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a waste-free recycling treatment process for printing ink wastewater, which is characterized by comprising the following steps of: (1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch; (2) sequentially carrying out catalytic oxidation and flocculation precipitation treatment on the supernatant A of the current batch, and obtaining a supernatant B of the current batch and a sludge precipitate B of the current batch; (3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained; (4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch; (5) and (4) sequentially circulating the steps (1) to (4) to treat all printing ink wastewater, and collecting all batches of recyclable salt and recyclable produced water. The process has simple flow and high treatment efficiency, can effectively reduce the chemical oxygen demand and the total soluble solid content in the waste water, and can realize the recycling of the ink waste water and the discharge of no waste.
Description
Technical Field
The invention belongs to the technical field of environmental engineering industrial wastewater treatment, and particularly relates to a waste-free recycling treatment process for printing ink wastewater.
Background
The printing ink waste water mainly comes from the working procedures of roller changing (ink changing), roller washing, tank washing, barrel washing and the like in the printing process; the waste water mainly contains water-based ink, resin, carbon black, alcohol and the like, and has the characteristics of complex waste water components, high organic matter content, more suspended matters, high chromaticity and the like, and contains a large amount of toxic and harmful components and substances.
According to the water quality characteristics of the printing ink wastewater, the printing ink wastewater treatment process is various at home and abroad. Mainly including physical, physicochemical, chemical, advanced oxidation, biological, membrane methods, etc. However, the single method has high treatment cost and the effluent effect is greatly influenced by the quality of the influent water. Therefore, the trend of research is to treat ink wastewater by a combined process of different methods. Because the concentration of the ink wastewater is as high as ten thousand and the chroma is very high, although the effects of a plurality of processes such as acid precipitation, advanced oxidation, ultrasonic oxidation, electrocatalysis and the like are good, the processes are only stopped in the research stage of a laboratory, and the current processes are less and really applied in engineering. Particularly, the recycling process of the ink wastewater is still the current technical difficulty.
Chinese patent (application No. 201310126028.5) discloses a water-based ink wastewater treatment process, which comprises a regulating tank, coagulation, air flotation, A/O biochemical treatment and the like. Chinese patent (application No. 201510313492.4) discloses a water-based ink treatment method, which comprises the steps of acid washing, coagulation, neutralization, biodegradation and the like; chinese patent (application No. 201510534696.0) discloses a treatment process of printing ink wastewater, which comprises the steps of natural sedimentation, acid precipitation, air flotation flocculation, catalytic reaction, alkali adjustment after the catalytic reaction and the like. However, the printing ink wastewater in the above technical scheme can reach a certain discharge standard after being treated, but the recycling of the printing ink wastewater cannot be completely realized.
Chinese patent (application No. 201510283258.1) discloses a zero discharge method of water-based ink waste liquid, which consists of a series of processes of regulating tank, advanced oxidation treatment, flocculation reaction treatment, solid-liquid separation treatment, electrocatalytic oxidation, anaerobic biochemical treatment, aerobic biochemical treatment, RO membrane treatment and multi-effect evaporation treatment. The treated RO produced water and the concentrated water treated by the RO membrane are subjected to multi-effect evaporation to be used as reuse water. But the general biochemical method has higher requirement on the stability of the water quality of the wastewater and is difficult to adapt to the water quality fluctuation.
Chinese patent (application No. 201410770232.5) discloses a method for recycling water-based ink wastewater, which comprises the steps of adding oxalic acid into the water-based ink wastewater, precipitating, filtering, and carrying out electrooxidation to obtain the water-based ink wastewater with COD (chemical oxygen demand) not higher than 500mg/L, chroma not higher than 20 and pH value of 6-8. The process has a good treatment effect on the water-based ink wastewater with low COD concentration (less than 10000mg/L), but has an unknown treatment effect on the high-concentration water-based ink wastewater, and waste residues are not recycled.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a method which has simple flow and high treatment efficiency, can effectively reduce the chemical oxygen demand and the total soluble solid content in the wastewater simultaneously so as to overcome the defects in the prior art and realize the recycling of the ink wastewater and no waste discharge.
The invention is realized by the following technical scheme.
A non-waste recycling treatment process for printing ink wastewater is characterized by comprising the following steps:
(1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch;
(2) sequentially carrying out catalytic oxidation and flocculation precipitation treatment on the supernatant A of the current batch, and obtaining a supernatant B of the current batch and a sludge precipitate B of the current batch;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained;
(4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to treat all printing ink wastewater, and collecting all batches of recyclable salt and recyclable produced water.
As a specific technical scheme, the non-waste recycling treatment process for printing ink wastewater comprises the following steps:
(1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch;
(2) sequentially carrying out catalytic oxidation and flocculation precipitation treatment on the supernatant A of the current batch, and obtaining a supernatant B of the current batch and a sludge precipitate B of the current batch;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained; combining the sludge sediment B of the current batch with the sludge sediment A of the current batch, then performing filter pressing treatment, collecting sludge filter cakes and performing coal blending combustion treatment;
(4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to collect all batches of recyclable salt and recyclable produced water after all printing ink wastewater is treated.
As a specific technical scheme, the non-waste recycling treatment process for printing ink wastewater comprises the following steps:
(1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch;
(2) mixing the previous batch of filtrate with the current batch of supernatant A, and then sequentially carrying out catalytic oxidation and flocculation precipitation treatment, wherein the current batch of supernatant B and the current batch of sludge precipitation B are obtained;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained; combining the sludge sediment B of the current batch with the sludge sediment A of the current batch, then performing filter pressing treatment, collecting sludge filter cakes and performing coal blending combustion treatment; meanwhile, collecting the filtrate of the current batch for later use, and merging the filtrate into the circulation treatment of the printing ink wastewater of the next batch;
(4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to collect all batches of recyclable salt and recyclable produced water after all printing ink wastewater is treated.
As a specific technical scheme, the coagulating sedimentation in the step (1) specifically comprises: and adjusting the pH value of the printing ink wastewater to 7-9, and then adding a coagulant and a coagulant aid for coagulation reaction.
As a specific technical scheme, the coagulant is polyferric sulfate.
As a specific technical scheme, the coagulant aid is polyacrylamide and/or sodium polyacrylate.
As a specific technical scheme, the catalytic oxidation and flocculation precipitation in the step (2) are specifically as follows: firstly, adjusting the pH value of a solution to be treated to 2.8-3.5, then adding ferrous ions and hydrogen peroxide for catalytic oxidation, and after reacting for 30-60 min, adjusting the pH value of the solution to 10-12 to enable Fe in the solution to be in the range of2+And/or Fe3+And (4) flocculating and settling.
As a specific technical scheme, the photocatalytic oxidation in the step (4) is specifically as follows: adding hydrogen peroxide into the concentrated water to be treated, and carrying out ultraviolet illumination to catalytically oxidize organic matters in the concentrated water.
As a specific technical scheme, the reverse osmosis in the step (3) is disc tube type reverse osmosis.
As a specific technical scheme, the filtration pore diameter of the precision filtration in the step (3) is 5-10 μm.
The invention has the beneficial effects that:
(1) the invention combines the processes of coagulating sedimentation, catalytic oxidation, flocculating sedimentation treatment, reverse osmosis treatment, photocatalytic oxidation treatment and the like, is used for treating printing ink wastewater, can obtain recyclable salt and produced water, and can be directly recycled by a production system, thereby reducing the process treatment cost; in addition, the sludge sediment generated in the process is subjected to filter pressing, and the sludge filter cake is subjected to coal blending combustion treatment, so that heat can be provided for the boiler, the advantages of reduction, harmlessness and recycling are achieved, and reasonable utilization of resources is realized.
(2) The invention has higher economic, environmental and social benefits, can realize the recycling of the ink wastewater, simultaneously achieves the purposes of water recycling, salt recycling and sludge resource utilization, and has no waste discharge in the whole process.
Detailed Description
The present invention will be further described with reference to the following detailed description, which should be construed as illustrative only, and not limiting the scope of the invention, which is to be given the full breadth of the appended claims, and all changes that can be made by those skilled in the art and which are, therefore, intended to be embraced therein.
Example 1
A waste-free recycling treatment process for printing ink wastewater comprises the following steps:
(1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch;
(2) sequentially carrying out catalytic oxidation and flocculation precipitation treatment on the supernatant A of the current batch, and obtaining a supernatant B of the current batch and a sludge precipitate B of the current batch;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained;
(4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to treat all printing ink wastewater, and collecting all batches of recyclable salt and recyclable produced water.
Example 2
A waste-free recycling treatment process for printing ink wastewater comprises the following steps:
(1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch;
(2) sequentially carrying out catalytic oxidation and flocculation precipitation treatment on the supernatant A of the current batch, and obtaining a supernatant B of the current batch and a sludge precipitate B of the current batch;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained; combining the sludge sediment B of the current batch with the sludge sediment A of the current batch, then performing filter pressing treatment, collecting sludge filter cakes and performing coal blending combustion treatment;
(4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to collect all batches of recyclable salt and recyclable produced water after all printing ink wastewater is treated.
Example 3
A waste-free recycling treatment process for printing ink wastewater comprises the following steps:
(1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch;
(2) mixing the previous batch of filtrate with the current batch of supernatant A, and then sequentially carrying out catalytic oxidation and flocculation precipitation treatment, wherein the current batch of supernatant B and the current batch of sludge precipitation B are obtained;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained; combining the sludge sediment B of the current batch with the sludge sediment A of the current batch, then performing filter pressing treatment, collecting sludge filter cakes and performing coal blending combustion treatment; meanwhile, collecting the filtrate of the current batch for later use, and merging the filtrate into the circulation treatment of the printing ink wastewater of the next batch;
(4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to collect all batches of recyclable salt and recyclable produced water after all printing ink wastewater is treated.
Example 4
A waste-free recycling treatment process for printing ink wastewater comprises the following steps:
(1) performing coagulation sedimentation treatment on the current batch of printing ink wastewater, namely adjusting the pH of the printing ink wastewater to 7-9, and then adding a coagulant and a coagulant aid for coagulation reaction to obtain a current batch of supernatant A and a current batch of sludge sediment A; wherein the coagulant is polymeric ferric sulfate, and the coagulant aid is polyacrylamide and/or sodium polyacrylate;
(2) mixing the previous batch of filtrate with the current batch of supernatant A, then sequentially carrying out catalytic oxidation and flocculation precipitation treatment, namely firstly adjusting the pH of the solution to be treated to 2.8-3.5, then adding ferrous ions and hydrogen peroxide for catalytic oxidation, and after reacting for 30-60 min, adjusting the pH of the solution to 10-12 to enable Fe in the solution2+And/or Fe3+Flocculating and precipitating, namely supernatant B of the current batch and sludge precipitate B of the current batch;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained; combining the sludge sediment B of the current batch with the sludge sediment A of the current batch, then performing filter pressing treatment, collecting sludge filter cakes and performing coal blending combustion treatment; meanwhile, collecting the filtrate of the current batch for later use, and merging the filtrate into the circulation treatment of the printing ink wastewater of the next batch; wherein the filtration pore diameter of the precision filtration is 5-10 μm, and the reverse osmosis is disc tube reverse osmosis;
(4) adding hydrogen peroxide into the concentrated water of the current batch, carrying out ultraviolet illumination, carrying out catalytic oxidation on organic matters in the concentrated water, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to collect all batches of recyclable salt and recyclable produced water after all printing ink wastewater is treated.
Example 5
This example illustrates CODCrThe printing ink wastewater (dichromate index) is 26000-30000 mg/L, TDS (total soluble solid) is 18000mg/LThe treatment process and the effect of the technology are as follows:
(1) performing coagulating sedimentation treatment on the current batch of printing ink wastewater, namely adding sodium hydroxide to adjust the pH value of the printing ink wastewater to 7-9, then adding polymeric ferric sulfate serving as a coagulant and cationic polyacrylamide serving as a coagulant aid, and controlling the concentration of the polymeric ferric sulfate to be 0.5-4.0 g/L and the concentration of the cationic polyacrylamide to be 5-15 mg/L in a coagulating sedimentation tank to perform coagulating reaction to obtain a current batch of supernatant A and a current batch of sludge sediment A;
(2) combining the previous batch of filtrate with the current batch of supernatant A, and then sequentially carrying out catalytic oxidation and flocculation precipitation treatment, namely firstly adding sulfuric acid to adjust the pH of the solution to be treated to 2.8-3.5, then adding ferrous sulfate heptahydrate and hydrogen peroxide to carry out catalytic oxidation so that the concentration of the ferrous sulfate heptahydrate in a catalytic oxidation pond is 8-14 g/L and the concentration of the hydrogen peroxide is 18-24 g/L, reacting for 30-60 min, then adding sodium hydroxide to adjust the pH of the solution to 10-12 so that Fe in the solution is adjusted to 10-122+And/or Fe3+Flocculating and precipitating, namely supernatant B of the current batch and sludge precipitate B of the current batch;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained; combining the sludge sediment B of the current batch with the sludge sediment A of the current batch, then performing filter pressing treatment, collecting sludge filter cakes, performing coal blending combustion treatment, supplying heat to a boiler, and realizing resource utilization; meanwhile, collecting the filtrate of the current batch for later use, and merging the filtrate into the circulation treatment of the printing ink wastewater of the next batch; wherein the filtration pore diameter of the precision filtration is 5-10 μm, and the reverse osmosis is disc tube reverse osmosis;
(4) adding hydrogen peroxide into the concentrated water of the current batch to enable the concentration of the hydrogen peroxide in the photocatalytic oxidation pond to be 10g/L, simultaneously carrying out ultraviolet illumination to catalytically oxidize organic matters in the concentrated water, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch which accord with recycling standards;
(5) sequentially circulating the steps (1) to (4), after all printing ink wastewater is treated, collecting all batches of recyclable salt and recyclable water; one part of the recyclable produced water is connected into the precision filtration process for backwashing the precision filter, and the other part of the recyclable produced water is connected into the production for use.
In this example, the effect after each process step is shown in table 1.
TABLE 1 Effect of the treatment Process of the present invention
As can be seen from Table 1, CODCr26000-30000 mg/L, TDS (total soluble solids) 18000mg/L printing ink wastewater is treated by the process, and the BOD of the finally discharged recyclable water is discharged5Is 25 mg.L-1SS is 0 mg. L-1TDS of 100 mg. L-1All meet the recycling standard.
Claims (10)
1. A non-waste recycling treatment process for printing ink wastewater is characterized by comprising the following steps:
(1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch;
(2) sequentially carrying out catalytic oxidation and flocculation precipitation treatment on the supernatant A of the current batch, and obtaining a supernatant B of the current batch and a sludge precipitate B of the current batch;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained;
(4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to treat all printing ink wastewater, and collecting all batches of recyclable salt and recyclable produced water.
2. The waste-free recycling treatment process of printing ink waste water as claimed in claim 1, characterized by comprising the following steps:
(1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch;
(2) sequentially carrying out catalytic oxidation and flocculation precipitation treatment on the supernatant A of the current batch, and obtaining a supernatant B of the current batch and a sludge precipitate B of the current batch;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained; combining the sludge sediment B of the current batch with the sludge sediment A of the current batch, then performing filter pressing treatment, collecting sludge filter cakes and performing coal blending combustion treatment;
(4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to collect all batches of recyclable salt and recyclable produced water after all printing ink wastewater is treated.
3. The printing ink wastewater non-waste recycling treatment process as claimed in claim 2, characterized by comprising the following steps:
(1) performing coagulating sedimentation treatment on the printing ink wastewater of the current batch to obtain a supernatant A of the current batch and a sludge sediment A of the current batch;
(2) mixing the previous batch of filtrate with the current batch of supernatant A, and then sequentially carrying out catalytic oxidation and flocculation precipitation treatment, wherein the current batch of supernatant B and the current batch of sludge precipitation B are obtained;
(3) performing reverse osmosis treatment after precisely filtering the supernatant B of the current batch, wherein the concentrated water of the current batch and the recycled produced water of the current batch can be obtained; combining the sludge sediment B of the current batch with the sludge sediment A of the current batch, then performing filter pressing treatment, collecting sludge filter cakes and performing coal blending combustion treatment; meanwhile, collecting the filtrate of the current batch for later use, and merging the filtrate into the circulation treatment of the printing ink wastewater of the next batch;
(4) carrying out photocatalytic oxidation treatment on the concentrated water of the current batch, and then evaporating to obtain recyclable salt of the current batch and recyclable produced water of the current batch;
(5) and (4) sequentially circulating the steps (1) to (4) to collect all batches of recyclable salt and recyclable produced water after all printing ink wastewater is treated.
4. The printing ink wastewater recycling treatment process according to any one of claims 1 to 3, wherein the coagulating sedimentation in the step (1) is specifically as follows: and adjusting the pH value of the printing ink wastewater to 7-9, and then adding a coagulant and a coagulant aid for coagulation reaction.
5. The process of claim 4, wherein the coagulant is polymeric ferric sulfate.
6. The process of claim 4, wherein the coagulant aid is polyacrylamide and/or sodium polyacrylate.
7. The printing ink wastewater recycling treatment process according to any one of claims 1 to 3, wherein the catalytic oxidation and flocculation precipitation in the step (2) are specifically as follows: firstly, adjusting the pH value of a solution to be treated to 2.8-3.5, then adding ferrous ions and hydrogen peroxide for catalytic oxidation, and after reacting for 30-60 min, adjusting the pH value of the solution to 10-12 to enable Fe in the solution to be in the range of2+And/or Fe3+And (4) flocculating and settling.
8. The printing ink wastewater recycling treatment process according to any one of claims 1 to 3, wherein the photocatalytic oxidation in the step (4) is specifically: adding hydrogen peroxide into the concentrated water to be treated, and carrying out ultraviolet illumination to catalytically oxidize organic matters in the concentrated water.
9. The process for recycling printing ink wastewater as claimed in any one of claims 1 to 3, wherein the reverse osmosis in the step (3) is a disc tube reverse osmosis.
10. The process for recycling printing ink wastewater as claimed in any one of claims 1 to 3, wherein the filtration pore size of the microfiltration in the step (3) is 5 to 10 μm.
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