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How effective is the disinfection equipment for secondary water supply?

2022-10-17

How effective is the disinfection equipment for secondary water supply?

　　Chlorination is essential in municipal water treatment and water supply systems. However, in industrial production processes, it is often necessary to remove residual chlorine from water as a pretreatment step to avoid adverse effects on the product. The primary methods for eliminating residual chlorine are activated carbon beds and chemical treatments. The requirements for secondary water disinfection are as follows: Secondary water disinfection in urban areas must effectively inactivate bacteria, and the byproducts generated after disinfection must have no adverse impact on water quality or human health. Secondary water supply disinfection equipment Economically reasonable, easy to manage, and the secondary water supply meets both domestic and drinking water quality standards. Drinking water quality and hygienic requirements for secondary water supply.

　　The main methods for secondary water disinfection equipment include ultraviolet disinfection, electronic disinfection, chlorine-based disinfectant disinfection, and ozone disinfection.

　　The aforementioned disinfection methods—such as ultraviolet light and electronic ozone—do not offer particularly effective results, and these devices tend to be unstable. Chlorine-based disinfectants, on the other hand, are highly effective and can kill a wide variety of bacteria. Compared with other methods, they also provide good continuous efficacy. However, storing and transporting chemical disinfectants can be inconvenient, and if generators are used, the raw materials may be toxic or less effective. Currently, there is a hypochlorous acid generator that can produce the disinfectant on-site, and its raw materials are both safe and simple. Such a unit gives users peace of mind and is easy to operate.

　　The drawbacks of activated carbon treatment include the need for continuous regeneration and frequent issues with bacterial growth. Ultraviolet light at wavelengths of 185 nm and 254 nm has been shown to effectively break the chemical bonds of residual chlorine and chloramines. Although this method requires substantial ultraviolet energy to function, its advantages lie in the fact that it does not necessitate adding any chemicals to the water, eliminates the need for chemical storage, is easy to maintain, and also possesses disinfecting and sterilizing properties while simultaneously removing organic substances.

　　The use of ultraviolet light for air disinfection in secondary water supply systems is just as old as its use for water disinfection. Air disinfection devices have been employed in hospitals, clinics, and cleanrooms for many years. Today, factories, offices, and even homes are also beginning to adopt air disinfection equipment. The principle behind air disinfection is the same as that used for water disinfection.

　　Typically, UV lamps can be installed in air ducts, at the front of coil units, or on wall-mounted racks. As air passes through, microorganisms in the air are killed and rendered harmless. Surface disinfection works in a similar way. In the food and beverage production industry, products on conveyor belts are disinfected using surface disinfection equipment. To reduce the costs associated with biocides—such as purchasing, storage, and insurance—as well as the health risks posed by chemical treatments, UV systems can be installed in cooling tower water circulation systems to provide disinfection and sterilization. When used in conjunction with filters, UV radiation can effectively control microbial growth in cooling towers. Although a certain concentration of biocide still needs to be maintained in cooling towers, the use of UV lamps can significantly reduce the amount of biocide required.


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