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Multistage photocatalytic treatment process for paint wastewater with ultraviolet visible light

A treatment process, photocatalytic technology, applied in water/sewage multi-stage treatment, energy wastewater treatment, water/sludge/sewage treatment, etc., to achieve obvious energy-saving effect, simple operation and less process flow

Active Publication Date: 2013-03-20
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are not many relevant literatures on the use of photocatalytic technology to treat pollutants produced in the paint production process. The one that can be found is the use of photocatalytic and The research on the treatment of paint waste gas by biotechnology combined process mainly uses photocatalysis combined with biotechnology to treat the harmful waste gas generated in the paint production process, and does not involve the treatment of paint waste water
So far, the direct application of photocatalytic technology to the treatment of high-concentration paint wastewater has not been reported.

Method used

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  • Multistage photocatalytic treatment process for paint wastewater with ultraviolet visible light

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0026] COD Cr About 240000mg / L, NH 3 -N is about 2200mg / L of high-concentration paint wastewater into the pretreatment pool, after rough treatment, adjust the pH=7.5, and add photocatalytic materials, introduce multi-stage photocatalytic equipment, after multiple cycles of reaction, the water COD Cr About 6400mg / L, NH 3 -N is about 500mg / L, the effluent is introduced into the bioremediation tank, aerobic sludge is added to it according to the mass ratio of sludge to water at 1:50, and intermittent aeration is performed, the COD of the water body after seven days Cr About 1400mg / L, NH 3 -N is about 50mg / L, and then chlorine dioxide is added to the water body at a ratio of 1:5000 by mass ratio of chlorine dioxide to water, and the COD of the final effluent Cr 95mg / L, NH 3 -N is 30mg / L, pH=7.1, chroma is less than 50. It has reached the secondary discharge standard of petrochemical industry in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

specific Embodiment 2

[0027] COD Cr About 390000mg / L, NH 3 -N is about 1400mg / L of high-concentration paint wastewater into the pretreatment pool, after rough treatment, adjust the pH=8.0 and add photocatalytic materials, introduce multi-stage photocatalytic equipment, after multiple cycles of reaction, the water COD Cr About 10489mg / L, NH 3-N is about 440mg / L, the effluent is introduced into the bioremediation tank, and activated sludge is added to it according to the mass ratio of sludge to water at a ratio of 1:40, and intermittent aeration, the COD of the water body after seven days Cr About 2700mg / L, NH 3 -N is about 40mg / L, and then chlorine dioxide is added to the water body at a ratio of 1:2000 by mass ratio of chlorine dioxide to water, and the COD of the final effluent Cr 140mg / L, NH 3 -N is 30mg / L, pH=6.7, chroma is less than 50. It has reached the secondary discharge standard of petrochemical industry in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

specific Embodiment 3

[0028] COD Cr About 310000mg / L, NH 3 -The high-concentration paint wastewater with N of about 1200mg / L is sent to the pretreatment tank, and after rough treatment, the pH is adjusted to 7.7. It can be discharged or recycled, and after adding photocatalytic materials, it is introduced into multi-stage photocatalytic equipment, and the water COD is produced after multiple cycles of reaction Cr About 8000mg / L, NH 3 -N is about 400mg / L, the effluent is introduced into the bioremediation tank, and activated sludge is added to it according to the mass ratio of sludge to water at a ratio of 1:50, and intermittent aeration, the COD of the water body after seven days Cr About 1700mg / L, NH 3 -N is about 35mg / L, and then chlorine dioxide is added to the water body at a ratio of 1:3000 by mass ratio of chlorine dioxide to water, and the COD of the final effluent Cr 125mg / L, NH 3 -N is 30mg / L, pH=6.9, chromaticity is less than 50, reaching the second-level discharge standard for petro...

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Abstract

The invention utilizes relates to a multistage photocatalytic treatment process for paint wastewater with ultraviolet visible light. The process utilizes ultraviolet visible light and combines a photocatalytic material to carry out the multistage photocatalytic treatment for the paint wastewater. The process is simple, has a low treatment cost and a high efficiency, and is easily operated. The treated residues are recovered or used as fuel, and the out-water is utilized or discharged. The harmless treatment of the paint wastewater is realized, and the process is suitable for the treatment of the paint wastewater.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a visible-ultraviolet multi-stage photocatalytic process for treating paint wastewater. Background technique [0002] In recent years, with the rapid development of my country's paint industry, a large amount of paint wastewater has been produced in the process of paint production and use. The waste water contains many types of pollutants in different states, COD Cr Up to 100,000-400,000 mg / L, NH 3 The -N content is as high as 800-2500 mg / L, and it also contains a large amount of various polymeric organic compounds used as thickeners and dispersants. Due to the small scale and variety of production in the coatings industry, it is usually produced intermittently and in batches. Its wastewater has the following characteristics: 1. Intermittent discharge, with relatively large fluctuations in water quality and water volume; 2. The wastewater produced by each production process varie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCY02W10/37
Inventor 王家强王义邵俊龙姜亮王福芝赵奂谢姣曾彦波高文宇
Owner YUNNAN UNIV
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