Method for cooperatively controlling effluent microorganisms and disinfection byproducts of sewage treatment plant

Abstract

The invention relates to a method for cooperatively controlling effluent microorganisms and disinfection byproducts of a sewage treatment plant, which comprises the steps of (1) adding a pypocholoride disinfectant into pretreated effluent of a secondary sedimentation tank of the sewage treatment plant, and uniformly stirring to obtain primarily treated sewage; (2) carrying out ultraviolet radiation treatment on the primarily treated sewage; and (3) continuously adding a hypochlorite disinfectant into the sewage subjected to ultraviolet radiation treatment in the step (2), and uniformly mixing for reaction, thereby completing the process. Compared with the prior art, the method provided by the invention does not need a complex and lengthy operation process, and can realize improvement of the microbial inactivation efficiency and effective reduction of the generation amount of DBPs by changing the combination sequence of conventional sodium hypochlorite disinfection and ultraviolet disinfection processes.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a method for synergistically controlling microorganisms and disinfection by-products in the effluent of a sewage treatment plant. Background technique [0002] In recent years, the increase in wastewater discharge has posed a serious threat to the drinking water supply, due to the presence of various substances highly reactive with chlorine in the treated wastewater, such as organic carbon, organic nitrogen and bromide, etc., which can be formed during chlorination Various DBPs, so sewage treatment becomes particularly important. At present, domestic and foreign treatment methods for sewage disinfection mainly include ultraviolet disinfection, free chlorine disinfection, ozone disinfection, combined disinfection and so on. The commonly used disinfection method in sewage treatment is free chlorine disinfection, which has the advantages of convenient use, good bactericidal ...

AI Technical Summary

Problems solved by technology

However, the currently commonly used sequential combination processes of "UV first, then chlorine" and "chlorine first, then UV" have certain defects in the process of sewage disinfection.

Since the current sewage disinfection usually does not set up a separate chlorine contact pool, the contact reaction time of chlorine disinfectant is short

When using "UV first and then chlorine" for disinfection, once the front-end UV dose is insufficient, the high-dose chlorine disinfectant added later will be discharged into the receiving water body before the contact reaction, there is a high risk of incomplete sterilization, and a large amount of disinfectant Directly discharged into the water body will have adverse effects on the water ecological environment; and when "chlorine first and then ultraviolet light" is used, although the contact time of chlorine disinfection increases, the high-dose free chlorine disinfectant added will accelerate consumption under subsequent ultraviolet light And produce active chlorine free radicals, not only the consumption of chlorine is large, but also the reaction between active chlorine free radicals and organic matter will increase the risk of generation of halogenated DBPs

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