It has been shown in the literature that the introduction of Fats, Oils, and Grease (FOG) into Anaerobic Digesters holds many benefits, namely the increase in efficiency of the digester, an increase in digester gas production, and the diversion of organic matter from landfills (Wimmer 2010). Several municipalities in Southern California, such as in Riverside, Rialto, and Oxnard have been involved in FOG digestion. As a result, the City of Los Angeles' Hyperion Treatment Plant started its own FOG digestion pilot project in 2010. The pilot injected FOG into one 2.5 million gallon thermophilic digester. The plant partnered with Baker Commodities, a grease rendering company, to bring 5,000 gallons of FOG initially and ramped up after that. Most critical digester parameters were monitored and results were analyzed. Although the digester was loaded 15% in Volatile Solids the effect was 30% increase in gas production, which demonstrated a "supercharging" or increase in efficiency effect in the digester.

Anaerobic digestion of high-strength organic wastes, such as Fats, Oils, and Grease (FOG) has become increasingly popular among wastewater treatment facilities in Southern California [1]. In 2010, the City of Los Angeles’ Hyperion Treatment Plant started running its own FOG Digestion Pilot Project. The project injects processed grease trap wastewater (FOG) into one of 16 anaerobic digesters at the facility. A partnership was formed between the Hyperion Treatment Plant (HTP) and Baker Commodities, Inc., a Grease rendering company located in the City of Vernon. They provide processed grease trap wastewater (FOG) to the pilot project. The plan was to load the digester with increasing amounts of FOG and observe the impact. The parameters monitored in the digester during the test are volatile acids, pH, alkalinity, temperature, and gas production in the digester. The pilot project’s objective was to obtain a 10 to 20% increase in gas production. So far those expectations have been exceeded.