Drinking Water

Our vast experience with drinking water applications allows atg UV to tailor a system that will be both cost effective and meet the disinfection requirements of various municipal applications world wide, including the latest DWI (Drinking Water Inspectorate) February 2010 UV Disinfection Guidelines.     

Flexible designs ensure atg UV can provide advanced technology solutions for both new installations and retrofits of existing systems.  atg UV can offer a range of UV systems that have been designed specifically for the drinking water industry and have been independently validated to demonstrate performance and full complience with regulations under a variety of operating conditions - US EPA Ultraviolet Disinfection Guidance Manual (UVDGM 2006 - The worlds strictest validation standard).

Above: 2 US EPA UVDGM Validated ECF 12 Lamp Medium Pressure Drinking Water System in South Africa.

In addition to third party validation, atg UV have invested in the latest CAD and CFD design software which simulates both the flow and radiation profiles of the chamber design.  Further testing includes trialing UV systems with a variety of surrogate organisms such as B. Subtilis, and T1, MS2 phage, to further increase accuracy and performance.

The UVDGM 2006 uses the mandate of the Safe Drinking Water Act to monitor emerging contaminants, under the Unregulated Contaminant Monitoring Regulation (UCMR2). Aimed at water supplies originating from lakes, reservoirs, ground water aquifers and rivers, the purpose of the UVDGM legislation is to ensure populations are kept safe from emerging pathogens such as Giardia and Cryptosporidium, which demonstrates enhanced resistance to conventional disinfectants such as chlorine.

Above:  atg UV SX Drinking Water UV System under going validation in New York, USA.  

atg UV can offer fully validated systems that deliver a 1 - 5 log reduction of Cryptosporidium for flows up to 2,500 M3/hr at 90% transmission within a single high output, small footprint, medium pressure system.  For larger flows, systems are offered as packages, utilising units placed in either series or parallel configurations.  Our UV applications include: -

• Surface Water Supplies
• Borehole Supplies
• Water Treatment Works
• Cryptosporidium Protection
• DWI Upgrade Programme
• Domestic Supplies
• Marine & Offshore Supplies
• Remote Location Supplies
• Service & Maintenance

As footprint is normally a key factor, due to limited space within pipe galleries, atg UV's market leading designs means UV systems can be installed either vertically, or horizontally. The degree of redundancy is determined by atg UV engineers working with plant designers, and a duty assist/ duty standby arrangement is typical of most major installations.

atg UV systems all use power switching to vary lamp power to optimise both power consumption and lamp life.  A leading robust mechanised wiper system keeps the optical path free from contamination to ensure continued optimum performance, and a third party monitor can be inserted to verify results. 

Once installed, the delivered dose is controlled by continuously measuring the inputs of flow, water transmittance and lamp intensity using a state-of-the-art SPECTRA Control panel which uses Microprocessor technology that can be easily integrated into existing systems communicating through MODBUS or PROFIBUS. SPECTRA's on board data logger also allows engineers to download performance data to a PC or laptop for review when needed.  Additionally atg UV can provide full PLC and HMI control option to suit a range of client specifications.