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Method for removing biochemical process tail water organic matters in wastewater by ultraviolet combined with chlorine

A technology for organic matter and sewage, applied in chemical instruments and methods, water/sewage treatment, light water/sewage treatment, etc., can solve the problems of toxic and harmful disinfection by-products, non-sustainable sterilization ability, etc.

Inactive Publication Date: 2017-08-29
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ultraviolet light or chlorine has been widely used in the oxidation or disinfection of drinking water and wastewater. The combination of the two can effectively avoid their respective shortcomings, such as ultraviolet light has no continuous sterilization ability, and chlorine disinfection is prone to produce toxic and harmful disinfection by-products

Method used

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  • Method for removing biochemical process tail water organic matters in wastewater by ultraviolet combined with chlorine

Examples

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Embodiment 1

[0012] Example 1: The biochemical tail water is taken from the secondary sedimentation tank effluent (COD Cr 45 mg / L, TN 15 mg / L, chromaticity 30 times), chlorine dosage 105 mg / L (one-time dosage), pH 7.0, temperature 25 0 c. The reaction is carried out for 30 minutes according to the steps in the method for removing organic matter in sewage biochemical tail water by combining ultraviolet rays and chlorine in the present invention. COD in this embodiment Cr The removal rate is 56%, TN removal rate is 35%, and chroma removal rate is 96.5%.

Embodiment 2

[0013] Example 2: The biochemical tail water is taken from the secondary sedimentation tank effluent (COD Cr 60mg / L, TN 18 mg / L, chromaticity 25 times), dosage 142 mg / L (multiple dosage), pH 7.5, temperature 25 0 c. The reaction was carried out for 30 minutes according to the steps in the method for removing organic matter in sewage biochemical tail water with ultraviolet combined with chlorine of the present invention. COD in this embodiment Cr The removal rate is 65%, TN removal rate is 42%, and chroma removal rate is 98%.

Embodiment 3

[0014] Example 3: The biochemical tail water is taken from the secondary sedimentation tank effluent (COD Cr 150 mg / L, TN65 mg / L, chromaticity 150 times), dosage 300 mg / L (multiple dosage), pH 7.5, temperature 25 0 c. The reaction was carried out for 60 min according to the steps in a method for removing organic matter in sewage biochemical tail water with ultraviolet combined with chlorine of the present invention. COD in this embodiment Cr The removal rate is 68%, TN removal rate is 35%, and chroma removal rate is 95%.

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Abstract

The invention belongs to the field of deep treatment and reuse of biochemical process tail water and particularly relates to a method for removing biochemical process tail water organic matters in wastewater by ultraviolet combined with chlorine. According to the technical scheme, the method is characterized by comprising the steps of I, adding a chlorine oxidant to wastewater biochemical process secondary effluent that is subjected to coagulating sedimentation to remove suspended organic matters, and stirring, wherein 5-350 mg / L of active chlorine generated by the chlorine oxidant is added; II, irradiating with ultraviolet for 1-60 min. According to the above scheme, the method degrades and mineralizes EfOM (effluent organic matters) through strong oxidizing power of hydroxyl radicals (HO.) and active chlorine (Cl., Cl.<-> and ClO.) by the aid of their co-oxidizing effect.

Description

technical field [0001] The invention belongs to the field of advanced treatment and reuse of biochemical tail water, and in particular relates to a method for removing organic matter in sewage biochemical tail water by combining ultraviolet rays with chlorine. Background technique [0002] Sewage secondary effluent organic matter (Effluent Organic Matter, EfOM) is the refractory organic matter remaining after the primary and secondary biochemical treatment of sewage, which is divided into insoluble and dissolved organic matter. Among them, the dissolved part accounts for about 86% (calculated as COD), mainly including microbial metabolites (SMPs), natural organic matter (NOM) and trace toxic organic matters (such as PPCPs, EDCs, etc.), which are the main removal objects and objects of advanced sewage treatment. difficulty. [0003] At present, technologies such as coagulation sedimentation, filtration, adsorption separation, ion exchange adsorption, membrane separation and ...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/52C02F1/76C02F1/32
CPCC02F1/32C02F1/52C02F1/76C02F1/763C02F9/00C02F2209/08C02F2209/16
Inventor 黄先锋王义郑向勇金展张业健赵敏
Owner WENZHOU UNIVERSITY
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