Disinfection and Clarification of Treated Sewage by Advanced Microfiltration

Abstract

A study was conducted to investigate the use of an advanced membrane microfiltration system to disinfect and clarify secondary and primary treated sewage. The membrane microfiltration system tested incorporated a patented gas backwashing technique which significantly reduces fouling. A comprehensive microbiological testing program established that all indicator bacteria and viruses were removed by this system. Testing for chemical quality showed significant reductions in BOD, suspended solids, turbidity, phosphorus, oil/grease and heavy metals. Consistent filtration rates over several months were achieved without significant biological fouling. The study conclusively showed the capability of the microfiltration system to disinfect and clarify treated sewage.