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Treatment method for controlling halogenated disinfection byproducts in drinking water

A technology for disinfection by-products and treatment methods, which is applied in water/sewage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., and can solve the problems of short service life, easy pollution, and high price of membrane separation technology. Achieve the effect of reducing the content of halogenated disinfection by-products, reducing teratogenic and toxic substances, and economical treatment process

Inactive Publication Date: 2018-04-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can remove disinfection by-products to a certain extent, they all have certain drawbacks.
For example, the aeration method cannot remove non-volatile disinfection by-products such as haloacetic acid, the activated carbon adsorption method is not effective and expensive for the removal of high-concentration organic matter in water, and the membrane separation technology has a short service life and is easy to pollute

Method used

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  • Treatment method for controlling halogenated disinfection byproducts in drinking water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A centrifugal pump is used to add pre-oxidant potassium permanganate at the outlet of the source water pipe, and the dosage is 2 mg / L; the water intake pump draws the pre-oxidized source water from the water collection well for coagulation, sedimentation, filtration and chlorination Conventional water treatment process for disinfection; the PH of the disinfected water is adjusted to 7, and then irradiated with ultraviolet light with a wavelength of 150nm to complete the water treatment process. In this embodiment, the irradiation time of ultraviolet light is 20 minutes, and the dose of ultraviolet light is 1000 joules / liter.

[0026] In this embodiment, the removal effect of trihalomethanes can reach more than 60%, which can effectively reduce the disinfection by-products of halogenated alkanes in water.

Embodiment 2

[0028] A centrifugal pump is used to add the pre-oxidant potassium permanganate at the outlet of the source water pipe, and the dosage is 0.5mg / L; Conventional water treatment process for amine disinfection; adjust the pH of the disinfected water to 9, and then irradiate with ultraviolet light with a wavelength of 280nm to complete the water treatment process. In this embodiment, the irradiation time of ultraviolet light is 30 minutes, and the dose of ultraviolet light is 500 joules / liter.

[0029] In this embodiment, the removal effect of haloacetonitrile can reach more than 40%, which can effectively reduce the content of nitrogen-containing disinfection by-products in water.

Embodiment 3

[0031] A centrifugal pump is used to add pre-oxidant potassium permanganate at the outlet of the source water pipe, and the dosage is 1mg / L; the water intake pump draws the pre-oxidized source water from the water collection well for coagulation, sedimentation, filtration, and chlorination Conventional water treatment process for disinfection; adjust the pH of the disinfected water to 10, and then irradiate with ultraviolet light with a wavelength of 230nm to complete the water treatment process. In this embodiment, the irradiation time of ultraviolet light is 60 minutes, and the dose of ultraviolet light is 15 joules / liter.

[0032] In this embodiment, the removal effect of haloacetic acid can reach more than 70%, which can effectively reduce the content of disinfection by-products of halogenated carboxylic acids in water.

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Abstract

The invention discloses a treatment method for controlling halogenated disinfection byproducts in drinking water. The treatment method comprises the following steps: (1) feeding source water into a water collection well through a source water tube, and adding potassium permanganate for preoxidation from the water outlet end of the source water tube, wherein the addition amount of the potassium permanganate is 0.5-2.0mg / L; (2) collecting water from the water collection wheel through a water collection pump room, coagulating with a coagulant, performing precipitation and filtration, and disinfecting the filtered water with chlorine or chloramines; and (3) adjusting the pH value of a disinfected water sample to 7-10, performing radiation treatment with ultraviolet light of which the wavelength is 150-280nm, and implementing light degradation by virtue of absorption properties of disinfection byproducts at the wave band. By adopting the treatment method disclosed by the invention, teratogenesis toxic substances in effluents are effectively reduced.

Description

technical field [0001] The invention relates to a drinking water treatment method, in particular to a treatment method for reducing the content of halogenated disinfection by-products in drinking water. Background technique [0002] Chlorination disinfection has the advantages of excellent disinfection effect, low price, sufficient supply, simple equipment, convenient operation, and subsequent disinfection of residual chlorine. It is still the most common drinking water disinfection method at home and abroad. More than 99.5% of the water supply The factory still adopts chlorine disinfection treatment process. my country's urban drinking water sources are mainly surface water, in which natural organic substances and other dissolved organic substances produced by human activities, as well as brominated and iodized organic substances in the water, are prone to react with chlorine disinfectants, resulting in a variety of halogenated disinfection side effects. product. Disinfect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/36
CPCC02F1/001C02F1/325C02F1/50C02F1/52C02F1/66C02F1/72C02F9/00C02F2001/007C02F2101/36
Inventor 杜蕾牛志广
Owner TIANJIN UNIV
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