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Aqueous ink waste water disposal process

A technology for water-based ink and wastewater treatment, applied in water/sewage treatment, illuminated water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of no patent disclosure, no literature report on water-based ink wastewater treatment, etc., and reach the standard The effect of emissions

Inactive Publication Date: 2007-09-19
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In our country, there are only relevant reports on the treatment of oily ink wastewater, but there are neither literature reports nor patent publications on the treatment of water-based ink wastewater.

Method used

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  • Aqueous ink waste water disposal process

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Add 100kg polyaluminum chloride to 200000L water-based ink wastewater (COD=3484mg / L, light transmittance 0), stir at a speed of 150rpm for 3min; then add 100kg of ferrous sulfate, stir at a speed of 50rpm for 5min, and let stand After precipitation, the supernatant is pumped into the oxidation tank, and the sludge is dehydrated and compressed. The light transmittance of the supernatant after flocculation treatment was 95.5%, COD=319mg / L, and the COD removal rate reached 90.8%. Use dilute hydrochloric acid to adjust the pH value of the supernatant to 3, add 40kg of ferrous sulfate and 220L of 30% hydrogen peroxide solution, under aeration conditions, after UV-Fenton oxidation for 5 hours, adjust the pH with sodium hydroxide solution After the iron ions are completely precipitated, take the supernatant to measure the light transmittance and COD value. After oxidation treatment, the light transmittance of the water sample is close to 100%, and the COD is 169mg / L. The tot...

example 2

[0021] Add 120kg polyaluminum chloride to 300000L water-based ink wastewater (COD=2571mg / L, light transmittance 0), stir at a speed of 150rpm for 5min; then add 90kg of ferrous sulfate, stir at a speed of 50rpm for 4min, and let stand After precipitation, the supernatant is pumped into the oxidation tank, and the sludge is dehydrated and compressed. The light transmittance of the supernatant after flocculation treatment was 96.5%, COD=319mg / L, and the COD removal rate reached 87.6%. Adjust the pH of the supernatant to 3 with dilute hydrochloric acid, add 60kg of ferrous sulfate and 240L of 30% hydrogen peroxide solution, and adjust the pH with sodium hydroxide solution after UV-Fenton oxidation for 6 hours under aeration conditions After the iron ions are completely precipitated, take the supernatant to measure the light transmittance and COD value. After oxidation treatment, the light transmittance of the water sample is close to 100%, and the COD is 175mg / L. The total remo...

example 3

[0023] Add 75kg polyaluminum chloride to 100000L water-based ink wastewater (COD=6968mg / L, light transmittance 0), stir at a speed of 150rpm for 4min; then add 60kg of ferrous sulfate, stir at a speed of 50rpm for 6min, and let stand After precipitation, the supernatant is pumped into the oxidation tank, and the sludge is dehydrated and compressed. The light transmittance of the supernatant after flocculation treatment was 97%, COD=463mg / L, and the COD removal rate reached 93%. Use dilute hydrochloric acid to adjust the pH value of the supernatant to 3, add 25kg of ferrous sulfate and 110L of 30% hydrogen peroxide solution, under aeration conditions, after UV-Fenton oxidation for 5 hours, adjust the pH with sodium hydroxide solution After the iron ions are completely precipitated, take the supernatant to measure the light transmittance and COD value. After oxidation treatment, the light transmittance of the water sample is close to 100%, and the COD is 254mg / L. The total rem...

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Abstract

The invention discloses a treatment for ink sewage, which comprises: adding proper PAC as flocculant in sewage, mixing round quickly, and adding proper ferrous sulfate as coagulant aid; mixing, depositing; using the supernatant for UV / Fenton oxidation under ultraviolet light; before oxidation, using hydrochloric acid to regulate solution pH value to optimal, adding given superoxol and ferrous sulfate; after reaction, adjusting solution to neutrality with superoxol and get rid of iron ion; depositing, and separating out water. The treated water has 97-100% transmittance with total removal rate to COD more than 93% that are between highest limit of second and third class discharge standard (GB 8978-1996).

Description

technical field [0001] The invention belongs to the waste water treatment technology of environmental science, and relates to a treatment process of water-based ink waste water. Background technique [0002] Water-based ink uses water as the main solvent or dispersion medium to replace 30% to 70% of toxic organic solvents in traditional inks, which can greatly reduce the amount of organic solvents used in the production process and reduce the amount of volatile organic compounds released into the air. At the same time, the equipment is easy to clean and meets the requirements of environmental protection. The demand for water-based inks at home and abroad is increasing. In the United States, 95% of flexographic printings and 80% of gravure printings use water-based inks. The annual domestic demand for water-based inks is more than 100,000 tons. Since the water-based ink does not contain volatile organic solvents, it can reduce the residual toxicity on the surface of the prin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F9/02C02F1/52C02F1/66C02F1/32C02F1/72C02F1/64
Inventor 马香娟夏会龙
Owner ZHEJIANG GONGSHANG UNIVERSITY
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