THE CAUSE OF LOW UV TRANSMISSIVITY AFTER MEDIA FILTRATION

摘要

The Pimpama Coomera Class A+ recycled water scheme encountered an unexpected challenge when the transmissivity of the water at the ultra-violet reactors dropped below the critical limit. The ramifications were that the production of Class A+ recycled water was not possible and, due to regulatory restrictions, could not be released from site. A systematic approach was implemented to identify the cause of the low transmissivity. Investigations identified operation of the media filters as the main cause of the low transmissivity. Analysis of the media filters revealed a high level of solids retained on the media due to poor performance of the cleaning sequence. Soluble natural organic matter was being released from the dirty media filters.