Secondary & Tertiary Effluent UV Disinfection
The vast majority of wastewater treatment plants around the world provide secondary treatment through conventional activated sludge processes. Some plants have tertiary treatment processes that use an additional filtration process to further improve water quality. The resulting effluent typically requires a disinfection step before discharge back to the environment.
Municipal wastewater generally requires disinfection to meet specific bacterial limits before discharge to surface waters. The main objective of disinfection is to reduce the number of waterborne pathogens to safe levels, and thereby lowering the risk of exposing the public to infectious diseases. The persistence of some pathogens in receiving waters and soils indicate that disinfection of wastewater effluents provide the first line of defense for drinking water from surface water or groundwater.
Typical disinfection standards for secondary and tertiary wastewater, such as 200 Fecal Coliforms per 100 mL on a 30 day geometric mean, are easily achieved with a suitably sized UV system. These conventional wastewater treatment plants typically discharge effluent to water bodies such as lakes, rivers and streams. The addition of filtration upstream of UV in a tertiary treatment process, while not necessary in most cases, does improve water quality by removing more particles and allows the wastewater treatment plants to meet even more stringent permit requirements – in some cases for water reclamation.
UV is an ideal disinfectant for wastewater since it does not alter the water quality – except for inactivating microorganisms. UV is a chemical-free process that can completely replace an existing chlorination system and also inactivate chlorine-resistant microorganisms like Cryptosporidium and Giardia. Unlike other chemical disinfectants, UV does not produce any carcinogenic disinfection by-products that could adversely affect the water quality. There is also an added benefit of reducing the carbon footprint of the disinfection system when a plant switches to UV since the carbon dioxide emissions from chemical transportation is eliminated.
Other TrojanUV Wastewater Applications
- Chlorine Conversion to UV Disinfection
- Water Reuse with UV Disinfection
- Low Quality Water Disinfection
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TrojanUV4000PlusThe TrojanUV4000Plus™ is the first commercially-successful, medium-pressure UV lamp system that’s specifically designed for handling high volume and lower quality wastewater.
TrojanUV3000PlusThe TrojanUV3000Plus was designed for medium to large wastewater treatment plants and features the patented ActiClean Cleaning System, an automatic chemical/mechanical wiping system.
Designed for small wastewater treatment plants that require a simple in-channel disinfection solution without chemicals.
A cost-effective, off-the-shelf solution for UV disinfection at small wastewater plants. It's simple to install and operate, and provides a hassle-free, dependable UV solution.
TrojanUVSignaChlorine is not the only disinfection option for mid- and large-scale applications. With the TrojanUVSigna™, operators and engineers can confidently choose UV and benefit from its inherent safety features, cost-saving advantages and disinfection performance.