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Municipal Wastewater

Application of Ultraviolet Disinfection Technology in Municipal Wastewater Treatment

Disinfection is the final, essential process in municipal wastewater treatment plants. It effectively kills pathogenic microorganisms (such as bacteria, viruses, and parasites) in wastewater, preventing the spread of disease, avoiding contamination of natural water bodies and soil, and safeguarding public health and ecological safety. It is an indispensable step in the wastewater treatment process. By the time wastewater enters the disinfection process, most organic matter and suspended solids have been removed, creating excellent water quality conditions for UV disinfection. UV disinfection processes have low investment and operating costs per unit of water volume, and UV disinfection ensures that the final discharged wastewater meets the various microbiological requirements of the receiving water.

There are two main types of UV disinfection systems used in municipal wastewater treatment plants:

Open-channel UV systems feature UV lamp modules installed horizontally or vertically in an open concrete channel, irradiating wastewater as it flows through the channel. Open-channel UV disinfection systems are the most commonly used disinfection method in wastewater treatment plants and are relatively easy to install and maintain.

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Closed-Vessel UV System: This system places UV lamps inside a closed reactor (usually a stainless steel cylinder), through which wastewater flows under pressure for disinfection. Its advantages include a small footprint and the ability to operate under pressure. It is suitable for applications with relatively small treatment volumes, MBR process effluent, and underground wastewater treatment plants.

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