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Method for removing haloacetic acids from water

A haloacetic acid, water removal technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve problems such as human health threats, carcinogenicity, teratogenicity and mutagenicity, and achieve investment Low cost and operating cost, short hydraulic retention time, small temperature effect

Inactive Publication Date: 2012-07-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, disinfectants can react with dissolved organic matter in water to form disinfection by-products
Many disinfection by-products are carcinogenic, teratogenic and mutagenic, posing a threat to human health

Method used

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  • Method for removing haloacetic acids from water
  • Method for removing haloacetic acids from water
  • Method for removing haloacetic acids from water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The average concentration of trichloroacetic acid in the raw water tank is about 185 μg / L; the EBCT of Fe-column and BAC-column is 2.5 minutes; the reaction temperature is 19°C. The average removal effect of nine samples of haloacetic acid under this condition is as follows image 3 .

[0051] image 3 It shows that TCAA in the raw water bucket becomes DCAA and MCAA after passing through the Fe-column, and the concentration of DCAA and MCAA decreases after passing through the BAC-column. Biodegradation occurs in the column. It shows that this method can effectively reduce the concentration of haloacetic acid in water.

Embodiment 2

[0053] The average concentration of trichloroacetic acid in the raw water tank is about 175 μg / L; the EBCT of Fe-column and BAC-column is 4 minutes; the reaction temperature is 15°C. The average removal effect of nine samples of haloacetic acid under this condition is as follows Figure 5 shown.

[0054] Figure 4 It shows that when the EBCT is 4 minutes, most of the TCAA in the raw water bucket is transformed into DCAA and MCAA after passing through the Fe-column. EBCT is beneficial to improve the dehalogenation efficiency of Fe-column to polyhaloacetic acid and the biodegradation effect of BAC-column to low-haloacetic acid, indicating that this method can efficiently treat haloacetic acid in water.

Embodiment 3

[0056] The average concentration of trichloroacetic acid in the raw water tank is about 165 μg / L; the EBCT of Fe-column and BAC-column is 10 minutes; the reaction temperature is 25°C.

[0057] Figure 5 It shows that TCAA in the raw water bucket is almost completely transformed into DCAA and MCAA after passing through the Fe-column, and no haloacetic acid is detected in the effluent after passing through the BAC-column. It can be seen that polyhaloacetic acid is almost completely dehalogenated into less haloacetic acid in the Fe-column , less haloacetic acids are fully biodegraded in the BAC-column. It shows that the method of the present invention can completely and rapidly remove haloacetic acid in water.

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Abstract

The invention relates to a method for removing haloacetic acids from water. The water containing the haloacetic acids flows through a reduction column / bed and an oxidation column / bed in turn; a filler in the reduction column / bed at least contains zero-valent iron; a filler in the oxidation column / bed at least contains a filler suitable for the growth of a biological film; the shape of the filler containing the zero-valent iron is one or more of a granular shape, a strip shape and a net shape; the filler is one or more of pure iron, cast iron and rusted iron; and the filler suitable for the growth of the biological film is one or more of activated carbon, ceramsite, anthracite, rubber and plastic. By the method, the treated water can meet the requirement of the drinking water quality standard on the concentration of the haloacetic acids; and the method has the characteristics of simplicity, reliability and high efficiency.

Description

technical field [0001] The invention relates to the technical field of treatment of disinfection by-products in water, in particular to a method for removing haloacetic acid in water. Background technique [0002] Disinfection is an integral part of the drinking water treatment process. The main purpose of disinfection is to eliminate pathogenic microorganisms and viruses in water, and to control the growth and reproduction of microorganisms in municipal pipe networks. However, disinfectants can react with dissolved organic matter in water to form disinfection by-products. Many disinfection by-products are carcinogenic, teratogenic and mutagenic, posing a threat to human health. [0003] At present, the drinking water quality standards of all countries in the world have stipulated the maximum concentration of two main disinfection by-products, namely haloacetic acid and trihalomethane, in drinking water. Among them, haloacetic acid is the general name of trihaloacetic aci...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/34C02F101/36
Inventor 解跃峰杨宏伟王小毛唐顺王小凤
Owner TSINGHUA UNIV
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