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.

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 COD_CrThe 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, COD_Cr26000-30000 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.