Ultraviolet light catalysis disinfection method by chlorine dioxide for water

Abstract

The invention discloses a UV light catalytic chlorine dioxide sterilization method for water. The water treatment method carries out water sterilization treatment by means of the combination of UV light and chlorine dioxide. The water sterilization treatment comprises the following steps that: after UV irradiation for sterilization is completed, the chlorine dioxide is added into water within 0 to 30 minutes so as to carry out the sterilization; or the chlorine dioxide is added into the water to carry out the sterilization and then UV irradiation for the sterilization is carried out within 0 to 30 minutes; or the chlorine dioxide is added into water to carry out the sterilization while carrying out the UV irradiation for the sterilization to water; or the chlorine dioxide is added in advance before carrying out water coagulation treatment, and the UV irradiation for the sterilization is adopted after treatments including coagulation, deposition and filtration; or after carrying out the treatments including the coagulation, the deposition and the filtration, etc. of a water sample, the method for the combination of the UV light and the chlorine dioxide is adopted to carry out water sample treatment. The UV light catalytic chlorine dioxide sterilization method ensures the biological safety and the chemical safety of the water sample.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a method for disinfecting water with ultraviolet photocatalytic chlorine dioxide. Background technique [0002] Disinfection is the most important and irreplaceable treatment unit in the conventional water treatment process. Chlorine disinfection is economical and efficient, and is widely used in various water treatment plants, water treatment facilities, and sewage reuse treatment processes. Its disadvantage is mainly that a variety of complex disinfection by-products are generated during the disinfection process, such as strong carcinogens such as trihalomethane haloacetic acid. [0003] In addition, simply controlling the amount of disinfection by-products cannot guarantee the safety of effluent water. Chlorine cannot effectively inactivate highly chlorine-resistant pathogenic microorganisms such as Cryptosporidium and Giardia lamblia. "Two worms" are two typical water-borne para...

AI Technical Summary

Problems solved by technology

[0004] For water treatment plants using single chlorine disinfection, it is almost impossible to ensure the inactivation effect of anti-chlorine pathogenic microorganisms and maintain a low level of chlorinated organic compounds in the effluent

At present, most surface water sources are polluted by organic substances. In this case, if a large amount of chlorine is used for disinfection, the content of disinfection by-products will increase significantly, forming a contradictory situation.

[0005] The disinfection effect of chlorine dioxide is better than chlorine disinfection, but it is still not guaranteed to kill highly resistant parasites such as "two worms" in actual production, and disinfection by-products such as perchloric acid may still be produced when the dosage is large