The operators of a wastewater treatment plant (WWTP) in Richmond, B.C. have opted to replace the existing low pressure UV disinfection system with a high output medium pressure UV system from Aquionics. The facility decided to switch to medium pressure UV because cleaning the low pressure system was very difficult. Each of the two low pressure units contained 24 lamps; automatic wiping is not an option with that number of lamps, so cleaning had to be done either manually or with chemicals. The two Aquionics units, however, each contain just two medium pressure lamps, each of which is fitted with an automatic wiper that keeps the quartz sleeves clean during normal operation. The Aquionics units are installed after a Sequencing Batch Reactor (SBR) and can treat a combined flow of up to 600 gallons per minute (2,271 litres per minute) of wastewater from the adjacent sports complex and residential areas. Each of the UV units is fitted with a monitor which measures actual UV intensity and dose from the two lamps, providing real time information which can be downloaded for record keeping. Operating the UV system is simple.
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