The Long Term 2 Extended Surface Water Treatment Rule (LT2) is aimed at water supplies originating from lakes, reservoirs, ground water aquifers, and rivers. The purpose of the legislation is to ensure that populations are kept safe from emerging pathogens such as Giardia and Cryptosporidium which demonstrate enhanced resistance to conventional disinfectants such as chlorine.
The Stage 2 Disinfectants & Disinfection Byproducts Rule (DBP) is designed to limit the formation of several byproducts of conventional disinfection, such as Total-trihalomethane (TTHM), Haloacetic Acid (HAA5), Chlorite, and Bromate. Several of these byproducts are either known to be or are suspected to be a carcinogenic.
The EPA uses the mandate of the Safe Drinking Water Act to monitor emerging contaminants, under the Unregulated Contaminant Monitoring Regulation (UMCR2). UV light is used successfully to remove Methyl-t-butyl ether (MTBE), a fuel oxygenate that causes unpleasant taste in water. Likewise, N-Nitrosodimethylamine (NDMA) is removed using UV light. NDMA is toxic and is suspected to be a carcinogen.
UV is used as a primary disinfectant for all waterborne organisms. UV is used to photolyze contaminants. As the number of emerging pathogens increases, and as more contaminants need to be controlled, the demand for UV will grow.
ETS-UV disinfection systems used in conjunction with an Advanced Oxidation Process (AOP) will remove Compounds of Emerging Concerns (CEC'S), Synthetic Organics (SO's), Endocrine Disruptor Compounds (EDC's) and Personal and Pharmaceutical Care Products (PPCP's), as well as various taste and odor compounds from water.
The degree of redundancy is determined by ETS-UV product specialists working with consulting engineers, typical number of reactors plus one for redundancy (n+1). The delivered dose is controlled by continuously measuring the inputs of flow, water transmittance, and lamp intensity. ETS-UV systems use power switching to vary the lamp power to optimize both power consumption and lamp life. Automatic wipers keep the optical paths free from contamination and a third party monitor can be inserted to verify the performance of the ETS-UV system.
Performance & Design Advantage
- Validated Performance - Validated by an independent 3rd party for performance to USEPA UVDGM and NSF/ANSI Standard 61 for drinking water
- Energy Efficient - Variable power delivers dose with precision
- Superior Design - Chambers are designed using emulation models to achieve the lowest head loss
- Quality Materials - Chambers are constructed of material that will withstand the powerful effects of the UV process and will not produce harmful carcinogenic byproducts
- Flexible Design - Chambers are compact and can be installed vertically or horizontally, systems can be incorporated as retrofit solutions or new construction
- Automatic Wiper - Wipers keep the optical path free from fouling lamps
Maintenance & Operational Advantage
- Quick Replacement - Wiper rings can be replaced without removing wiping carriage from chamber
- Small Maintenance Space Required - Single sided access for lamp replacement
- Safety - Plug and play connections, lamps utilize a twist lock plug connection that automatically centers the lamp, UV light and electricity are isolated with a water tight connection
We believe that good design should make products safe, understandable, innovative and useful. Through the continued relationship of service, we examine wear throughout the product lifecycle and rely on Field Service Technician feedback on product improvement. We also utilize a variety of design tools that provide emulation of system performance. This has led to many of the innovative features that have been a source of advantage.
- Emulate the performance of UV systems by using advanced software tools
- Use Finite Element Analysis (FEA) to understand how the UV chambers will become stressed under hydraulic pressure
- Predict weakness in design with Computational Fluid Dynamics (CFD)
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