LOS ANGELES SELECTS BIO-TRICKLING/ACTIVATED CARBON FOR COLLECTION SYSTEM ODOR CONTROL

The City of Los Angeles is building two new large 12-feet diameter interceptor sewers across the northeastern and southern portions of Los Angeles. The interceptors are designed to relieve hydraulic overloading and address potential wet weather overflows. The new collection system requires odor control measures due to its numerous drop structures and siphons.Large scale pilot testing was undertaken to investigate a two stage air treatment approach. A 4,000 cfm biotrickling filter (BTF) was installed at the Hyperion Treatment Plant as first-stage of an air treatment pilot system. Second-stage treatment testing involved three types of biofilter media, and two types of activated carbon media.As a result of the pilot studies, the final collection system air treatment facility design concept involving BTF followed by two stages of virgin carbon.