Method for disinfecting filtered water from water plant with cooperation between medium-pressure ultraviolet catalyzing peroxymonosulfate and chloramine

Abstract

The invention discloses a method for disinfecting filtered water from a water plant with cooperation between medium-pressure ultraviolet catalyzing peroxymonosulfate and chloramines. The method includes following steps: adding peroxymonosulfate to outlet water from a water plant filtering tank to obtain a mixed solution with a concentration being 0.2-0.4 mmol/L through a tubular mixer; performing disinfection to the mixed solution in a medium-pressure ultraviolet disinfecting reactor, wherein an addition dosage of the medium-pressure ultraviolet is 10-20 mj/cm<2> and a disinfection time in the reactor is 5-10 min; and adding 0.3-0.4 mg/L chloramines to an end of the ultraviolet disinfecting reactor to complete the disinfection with cooperation between medium-pressure ultraviolet catalyzing peroxymonosulfate and chloramines. By means of the method, a cooperative effect of medium-pressure ultraviolet, peroxymonosulfate and chloramines fully works so that bacteria and microorganisms can be controlled in high efficiency and a reagent addition dosage and disinfection by-product can be reduced. Sustainability of disinfection and sterilization of water in a following water supply network can be ensured and drinking water safety can be ensured.

Description

technical field [0001] The invention relates to a drinking water disinfection method, in particular to a medium-pressure ultraviolet disinfection method enhanced by persulfate and chloramine. Background technique [0002] In recent years, drinking water safety and sanitation issues have attracted global attention, and water quality safety has become a major global strategic issue. Microorganisms are an important cause of waterborne diseases, and the removal and control of pathogenic microorganisms in water is the basis for ensuring water quality safety. [0003] At present, drinking water disinfection mainly adopts methods such as chlorine and chloride disinfection, ozone disinfection, ultraviolet disinfection and some heavy metal ion disinfection. However, these traditional disinfection methods have great disadvantages in application. For example: after chlorine disinfection, disinfection by-products such as chloroform will be produced, and the chlorine disinfection proce...

AI Technical Summary

Problems solved by technology

However, these traditional disinfection methods have great disadvantages in application.

For example: after chlorine disinfection, disinfection by-products such as chloroform will be produced, and the chlorine disinfection process has poor removal effect on Giardia and Cryptosporidium

Ozone disinfection production equipment is complicated, the investment is large, and it is easy to produce carcinogens such as bromate

Because ultraviolet disinfection can effectively destroy the DNA structure of bacterial microorganisms, it can kill bacterial microorganisms and make them lose their self-reproduction ability. The traditional low-pressure ultraviolet disinfection effect is greatly affected by water quality, especially some particulate matter and organic substances that can absorb ultraviolet light greatly affect the mass transfer efficiency of ultraviolet photons in water, and the ultraviolet lamp required to achieve a good disinfection effect The number of tubes is large, and equipment maintenance and operation are troublesome

Traditional ultraviolet hydrogen peroxide and ultraviolet disinfection technologies cannot guarantee continuous sterilization in the pipe network, and need to add a large amount of chlorine or chloramine to ensure continuous disinfection in the pipe network, and the effect of controlling disinfection by-products is not optimal , and the excessive addition of hydrogen peroxide is useless consumption and remains in the water, failing to optimize energy saving and effectively connect each process section

In addition, when the amount of chloride ions in the natural water body is low, the Cl produced in situ by simply adding persulfate 2 The amount cannot guarantee the continuous disinfection effect of sufficient pipeline network

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