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Municipal water supply

Ultraviolet disinfection has been officially recognized as a recommended process for municipal water supply disinfection design in the "Outdoor Water Supply Design Standard" GB 50013-2018 Ultraviolet Disinfection Technical Specification.

In drinking water treatment, disinfection is the final and core process for ensuring the biological safety of drinking water. Ultraviolet disinfection technology has become a key means of ensuring water quality safety in water supply systems of all sizes, with applications ranging from large-scale municipal projects to community-level water supply installations.

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Chlorine disinfection produces disinfection byproducts (DBPs), such as trihalomethanes (THMs) and haloacetic acids (HAAs). Some of these DBPs have been shown to pose carcinogenic, teratogenic, or mutagenic risks. Chlorine disinfection also has limited effectiveness against certain resistant microorganisms, such as Cryptosporidium and Giardia lamblia.

The most advanced drinking water disinfection process is a multi-barrier process: UV combined with chlorine/chloramine disinfection.

Combined UV and chlorine (or chloramine) disinfection is a widely used and mature multi-barrier disinfection process in municipal water supply. It leverages the characteristics of different disinfection technologies to form a synergistic application model, creating a dual-protection mechanism for microbial inactivation.

UV, as the first-level disinfection barrier, leverages its broad-spectrum bactericidal properties to effectively inactivate various pathogens in water, particularly chlorine-resistant microorganisms such as Cryptosporidium and Giardia lamblia, which are less resistant to chlorine disinfection.

Chlorine/chloramine acts as a secondary disinfection barrier, added after UV disinfection to provide sustained disinfection (residual chlorine or chloramine) within the pipe network. This inhibits secondary microbial growth during water distribution and ensures the biosafety of tap water. Research data shows that when UV is used as the core treatment process, the CT value (the product of concentration and contact time) required for subsequent chlorine disinfection can be significantly reduced.

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Advanced Treatment of Municipal Water

Due to the impact of source water pollution and rising water quality standards, most municipal water plants are implementing advanced treatment processes for drinking water.

Ozone pre-oxidation process
UV高級氧化(UV-AOPs)

Improvement of drinking water quality through deep treatment

Efficiently remove organic matter, degrade TOC, UV25φ and other comprehensive indicators of organic matter in water
Remove odor from water and improve water quality, taste and other sensory indicators
Improve the biological stability of effluent
Control and degrade the precursors of disinfectant appendages
Remove new pollutants and other trace organic matter that affects human health

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