Device for removing disinfection by-products from water

Abstract

The invention relates to a device for removing disinfection byproducts in water. The device comprises an enhanced coagulation tank, an ultrafiltration membrane component, a nanofiltration membrane component, a pervaporation membrane component and a collection device, wherein a to-be-treated water sample sequentially flows through the enhanced coagulation tank, the ultrafiltration membrane component, the nanofiltration membrane component and the pervaporation membrane component for treatment and then flows to the collection device for collection. In the device for removing disinfection byproducts in water, provided by the invention, the enhanced coagulation tank and a three-level integrated membrane device composed of the ultrafiltration membrane component, the nanofiltration membrane component and the pervaporation membrane component are combined to remove the disinfection byproducts in water; and through organic combination of the devices, the removal rate of the disinfection byproducts exceeds 90%, the disinfection byproducts in water can be effectively reduced, the water quality requirements on safe water are met, and the device is of important significance to purifying the swimming pool water, the drinking water and the like after chlorination disinfection.

Description

technical field [0001] The invention relates to a water treatment device, in particular to a device for removing disinfection by-products in water. Background technique [0002] Chlorination disinfection is the most widely used disinfection method in drinking water processing and has a history of hundreds of years. However, the chlorination disinfection method will inevitably produce chlorination disinfection by-products (DBPs). As early as 1974, studies have found that DBPs have strong carcinogenic, teratogenic, and mutagenic effects, which seriously endanger human health. [0003] In order to ensure the safety of human water use, the control of DBPs in water has been highly valued by countries all over the world. At present, the United States reduces the maximum allowable concentration of THMs in drinking water in two stages: in the first stage, THMs are reduced from 100 μg / L to 80 μg / L; in the second stage, THMs are further reduced to 40 μg / L. my country has also made ...

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Problems solved by technology

[0006] At present, the disinfectants and methods that replace chlorination disinfection mainly include chloramine, ozone and ultraviolet light, etc.: studies have found that reducing the ratio of chlorine to ammonia nitrogen to 5 can reduce the DBPs generated by chlorine disinfection alone by 89%; The amination process not only achieves some of the efficacy of pre-oxidation processes, but also prolongs the contact time of chloramine disinfection and improves the microbial safety of drinking water, but Plewa J, a genetic toxicologist in the Department of Food Science at the University of Illinois Michael's research found that a chloramine disinfection by-product is the most toxic found so far; as a strong oxidant, ozone's bactericidal and oxidizing capabilities are higher than chlorine, and it is the most effective disinfectant in the current dosing disinfection method. Its advantages It does not produce disinfection by-products such as THMs, but the instability of ozone in water makes it difficult to use it as a disinfectant alone for disinfection of drinking water, and ozone disinfection may produce by-products such as bromate; ultraviolet rays The broad-spectrum of sterilization is the highest among all disinfection technologies at present. It can effectively kill a variety of parasites that cannot be killed by chlorine and ozone, such as recessive cysts and Giardia, and there is no DBPs However, the penetration ability of ultraviolet rays in water and the power and life of ultraviolet lamps restrict the application of ultraviolet disinfection methods in drinking water disinfection.

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