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Process for photocatalytic treatment of industrial waste water

A technology of industrial wastewater and photocatalysis, which is applied in the direction of light water/sewage treatment, oxidized water/sewage treatment, energy wastewater treatment, etc., can solve the problems of non-reporting, etc., and achieve the effect of cost reduction and low cost

Inactive Publication Date: 2009-10-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current photocatalytic technology is mainly on the preparation and structural characterization of photocatalysts, but there is no report on the actual process of degrading actual wastewater.

Method used

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  • Process for photocatalytic treatment of industrial waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Industrial wastewater to be treated: acrylic acid wastewater

[0018] 1) Pretreatment: After removing the solid pollutants in the circulating wastewater by filtration, add HCl to adjust the pH=2 to 3;

[0019] 2) After the pretreated wastewater (COD fluctuates between 25 000 and 30 000ppm) is introduced into the main reactor, the photocatalyst non-supported TiO is added at a ratio of 12kg / ton of wastewater 2 , H 2 o 2 The content is 0-10kg / ton of wastewater, and air is blown into the wastewater at the same time. The light source is irradiated by low-pressure mercury lamp and sunlight at the same time, and the wastewater in the reaction system is always in a stirring state;

[0020] 3) After the degradation is completed, the regenerated water flows out from the upper part of the main reactor, and the regenerated water takes out the catalyst and separates it through natural sedimentation in the sedimentation tank.

[0021] The COD of the degraded recycled water is lowe...

Embodiment 2

[0023] Industrial wastewater to be treated: acrylic acid wastewater

[0024] 1) Pretreatment: After removing the solid pollutants in the wastewater by filtration, add HCl to adjust the pH=1 to 2;

[0025] 2) Introduce the pretreated wastewater (COD fluctuates between 25,000 to 30,000ppm) into the main reactor, and add non-supported metal-doped TiO at a ratio of 20 to 30kg / ton of wastewater 2 and non-supported non-metal doped TiO 2 , and at the same time add H at a ratio of 1 to 5kg / ton of wastewater 2 o 2 and 20-45kg of FeCl 3 Forming Fenton’s reagent, blowing air into the wastewater, the light source is irradiated by low-pressure mercury lamp and sunlight at the same time, and the wastewater in the reaction system is always in a stirring state;

[0026] 3) After the degradation is completed, the regenerated water flows out from the upper part of the main reactor, and the regenerated water takes out the catalyst and separates it through natural sedimentation in the sedimen...

Embodiment 3

[0029] Industrial wastewater to be treated: starch wastewater

[0030] 1) Pretreatment: settle the suspended solids in the wastewater by sedimentation, then add sulfuric acid to adjust the pH of the wastewater to 4-5;

[0031] 2) Introduce the pretreated wastewater (COD fluctuates between 7000-15000ppm) into the reaction system, and add photocatalyst-loaded metal-doped TiO at a ratio of 5kg / ton of wastewater 2 , air is blown into the wastewater, the light source is irradiated by sunlight, and the wastewater in the reaction system is always in a stirring state;

[0032] 3) After the degradation is completed, the regenerated water flows out from the upper part of the main reactor, and the regenerated water takes out the catalyst and separates it through natural sedimentation in the sedimentation tank.

[0033] The COD of the degraded recycled water is lower than 100ppm, meeting the national discharge standard. Compared with the technology, chemical flocculation and precipitati...

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Abstract

The invention provides a process for photocatalytic treatment of industrial waste water, and belongs to the field of waste water treatment. The invention aims to solve the problem of the lack of the process for the effective photocatalytic treatment of the industrial waste water. The process comprises the following steps that: 1), the waste water is pre-treated, and the pH value of the waste water is adjusted to be 1 to 13; 2), effluent is led into a main reactor, a photocatalyst, an auxiliary oxidant and an oxygen source are added to degrade the pollutants in the effluent under a lighting condition, wherein the addition of the photocatalyst is 0.1 to 100kg per ton of waste water, the addition of the auxiliary oxidant is 0 to 50Kg per ton of waste water, and the addition of the oxygen source is 0 to 50Kg per ton of waste water; and 3), the effluent is led into a sedimentation basin to separate the photocatalyst and regenerated water by natural settlement. The process has the advantages of low cost, easy maintenance, strong applicability, easy operation, high efficiency, complete degradation, no toxin and harmlessness, greenness and environmental protection, and the like.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a process for treating waste water by using a photocatalyst. Background technique [0002] The development of industry has caused more and more serious environmental pollution, and a large number of pollutants in water seriously threaten the health of human beings themselves. According to the evaluation of 109,700 kilometers of rivers in my country in 1998, 70.6% of the length of rivers in our country is polluted, so wastewater treatment is the top priority of environmental protection work. The rapid development of modern new industries and the continuous improvement of people's living standards have led to a sharp increase in the discharge of refractory organic wastewater, and the limited water resources have been seriously polluted. The problem of water pollution worldwide has attracted more and more attention. Therefore, the governments of various countries ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/72
CPCY02W10/37
Inventor 张敬畅张国良曹维良
Owner BEIJING UNIV OF CHEM TECH
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