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Method for reducing chlorite as disinfection by-product of drinking water

A disinfection by-product, chlorite technology, applied in chemical instruments and methods, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of large dosage and the content of by-product chlorite in water It is difficult to meet the standards stably, and the water plant is troubled, so as to achieve the effect of reducing the content of chlorite and improving the safety of water quality

Inactive Publication Date: 2010-07-14
SHENZHEN SHENSHUI BAOAN WATER
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Problems solved by technology

[0004] In addition, due to raw water quality factors, the dosage of chlorine dioxide is often relatively large. When water plants apply chlorine dioxide pre-oxidation and disinfection processes, the content of by-product chlorite in the water is often difficult to meet the standard in a stable way. Seeking a breakthrough to solve a common problem that has plagued water plants applying chlorine dioxide pre-oxidation and disinfection processes for many years

Method used

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  • Method for reducing chlorite as disinfection by-product of drinking water
  • Method for reducing chlorite as disinfection by-product of drinking water
  • Method for reducing chlorite as disinfection by-product of drinking water

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Embodiment 1

[0027] Embodiment 1 A water plant in Shenzhen City reduces the treatment method of disinfection by-product chlorite in the factory water

[0028] Raw water situation

[0029] The raw water is reservoir water, and the water source is subject to organic pollution. It belongs to Class III surface water quality, with an average turbidity of 14.03 NTU, a maximum manganese content of 0.46 mg / L, and an average of 37.2 million algae cells per liter. It has obvious high algae and low Features of turbidity and organic micro-pollution.

[0030] Chlorine Dioxide Preparation

[0031] Using the complete set of equipment from Shenzhen Suriman Company, the preparation method is as follows: sodium chlorate, sulfuric acid (70% concentration by mass) and hydrogen peroxide (50% concentration by mass) are mixed and reacted to prepare chlorine dioxide (gaseous state, purity 95%) %).

[0032] figure 1 For the present invention reduces the method flowchart of drinking water disinfection by-produc...

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Abstract

The invention relates to a method for processing drinking water, in particular to a method for reducing chlorite as the disinfection by-product of drinking water. In the method, chlorine dioxide gas is first used to preoxidate raw water, lime is then added to regulate the pH value, coagulant is then added, coagulation, sedimentation and filtration are carried out to remove turbidity, and sodium hypochlorite solution is added for disinfection. Under the premise of ensuring that drinking water can meet the disinfection effect, the method which adopts the chlorine dioxide for preoxidation and the sodium hypochlorite for disinfection can greatly reduce the content of the chlorite as the disinfection by-product and ensure that the content of the chlorite can absolutely meet the requirement of the national standard on drinking water, thus greatly enhancing the safety of water quality.

Description

technical field [0001] The invention relates to a drinking water treatment method, in particular to a method for reducing drinking water disinfection by-product chlorite. Background technique [0002] In the process of surface raw water treatment, the water plant must include the addition of disinfectants to disinfect the water body. Depending on the quality of the raw water, it usually also includes adding an oxidant to pre-oxidize the raw water to oxidize the organic matter and algae in the water. At present, it is common to use chlorine dioxide as a pre-oxidant and disinfectant in small and medium-sized water plants in China, and it is also used in a few large water plants. [0003] However, theory and practice show that about 70% of chlorine dioxide disinfection is directly converted into chlorite, a carcinogenic and mutagenic by-product of disinfection. "National Drinking Water Hygienic Standard" (GB5749-2006) stipulates that the maximum limit of chlorite by-product s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/66C02F1/52C02F1/50
Inventor 黄晓东汪义强文汉华陈鹰
Owner SHENZHEN SHENSHUI BAOAN WATER
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