Control method for chlorine-resistant bacteria in drinking water

Abstract

The invention belongs to the technical field of disinfection of drinking water, and relates to a control method for chlorine-resistant bacteria in drinking water. The control method comprises the following main steps: (1) controlling a pH value of a bacterial liquid sample to be 6.5 to 8.5; (2) adding a peroxymonosulfate, a peroxydisulfate or a mixed chemical of the monosulfate and the peroxodisulfate according to a ratio of 1: 1 into the sample; (3) carrying out treatment with a medium-pressure ultraviolet lamp tube commonly used in actual water treatment; and (4) adding sodium hypochlorite or chlorine dioxide as a disinfectant into outgoing water obtained by treatment, wherein the time of disinfection and the remaining amount of a disinfectant meet the requirements of the Sanitary Standard for Drinking Water (GB5749-2006). The method provided by the invention adopts a combined disinfection form of a persulfate, UV and sodium hypochlorite / chlorine dioxide to form advanced oxidation, can effectively cope with the problem of propagation of the chlorine-resistant bacteria in source water, can maintain the remaining amount of the disinfectant in pipe network water up to standards, andcan comprehensively guarantee the microbiological safety of the drinking water.

Description

technical field [0001] The invention belongs to the technical field of drinking water disinfection and relates to a method for controlling chlorine-resistant bacteria in drinking water. Background technique [0002] Ensuring the microbial safety of drinking water is the primary goal in drinking water treatment. As the main form of drinking water disinfection, chlorine disinfection has many advantages such as sterilization spectrum, economy, and convenience, and has made a huge contribution to the protection of drinking water microbial safety. contribute. However, some microorganisms have high chlorine resistance or have gradually formed high chlorine resistance during the long-term use of chlorine disinfection, called chlorine-resistant bacteria, which are difficult to kill by chlorine disinfection. Therefore, it is necessary to seek more advanced disinfection methods to ensure the safety of drinking water quality in an all-round way. [0003] The main technical problem th...

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Problems solved by technology

This method first carries out ultraviolet disinfection, then adds potassium monopersulfate, also has the problem of aforementioned prior art, can kill a small part of chlorine-resistant bacteria, is unfavorable for the guarantee of chlorine product disinfection effect, and potassium monopersulfate is not in In the sanitation standard for drinking water (GB5749-2006) list of disinfectants, it cannot be applied industrially

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