LO-CAT ® PROCESS FOR WASTE WATER TREATMENT PLANTS In 1980, Los Angeles began exploring alternatives to control the H 2 S concentration in the digester gas produced at the Hyperion Waste Water Treatment Plant (WWTP), which treats nearly 420 MGD, wastewater generating over 475 tons of raw sludge per day. The digester gas H 2 S concentration had to be controlled so that the SO X emissions from the on-site combustion of the gas could be kept

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