Drinking Water
ETS has developed a range of drinking water UV systems that comply with the requirements of the US EPA Guidance manual, and have been independently validated to demonstrate performance envelopes under a variety of operating conditions. The systems are modeled using CFD emulation tools, which are continuously and iteratively improved following bioassay, routinely undertaken with a variety of surrogate organisms such as B. Subtilis , T1 , and MS2 phage.
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 suspected as 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), an fuel oxygenate that causes unpleasant taste in water. Likewise N-Nitrosodimethylamine (NDMA) is removed using UV light. NDMA is toxic and a suspected carcinogen.
UV is used as a primary disinfectant for all water-borne 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.
Systems are installed in line either vertically or horizontally. Footprint is normally a key factor, as pipe galleries are usually very tight and cramped. The degree of redundancy is determined by ETS engineers working with plant designers, typical number of reactors plus one for redundancy (n+1) is typical. The delivered dose is controlled by continuously measuring the inputs of flow, water transmittance, and lamp intensity. The ETS systems all use power switching to vary lamp power to optimize both power consumption and lamp life. Wipers keep the optical paths free from contamination, and a third party monitor can be inserted to verify the performance of the ETS system.
Ultraviolet disinfection is suited for the following drinking water applications:
WELL WATER| Traditionally well water supplies are of high quality, meaning an ETS disinfection system is the perfect technology choice to provide an effective and efficient barrier against harmful microorganisms within a small footprint.
SURFACE WATER | ETS has a vast knowledge of drinking water applications and understands the variable quality and challenges associated with surface water. With a vast range of products, ETS can provide systems for any specification.
DOMESTIC SUPPLIES | ETS has provided UV disinfection systems for the treatment of drinking water for individual properties and small village supplies around the world, typically treating between 10 and 70 gpm in a single high output low footprint system.
WATER TREATMENT PLANTS| ETS has supplied drinking water systems capable of treating up to 20 MGD in a single unit, with the treatment of larger flows attained by installing parallel UV chambers, ETS can provide effective solutions for specifications of any size.
MICROORGANISMS | Ultraviolet protection provides an effective barrier against harmful microorganisms including chlorine resistant pathogenic organisms such as Cryptosporidium, where recent outbreaks have seen an increased demand for UV protection.
INTEGRATION & TECHNOLOGY| ETS designs systems with ease of integration into existing space. ETS's leading technology allows for product flexibility across a range of specifications vastly reducing the complexity of installing UV protection.
SERVICE & SPARES | ETS offers a dedicated spares and service division to ensure your unit is running at optimum levels. Service options include: 24hr assistance, enhanced warranty coverage, spares and annual preventative maintenance.
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