Two case studies present performance results of externally mounted mixing systems installed at anaerobic digestion plants in California…Chopper pumps by ABC member Landia at a food waste-to-energy facility have helped boost gas production from two anaerobic digesters. The Chino-based facility, 40 miles east of Los Angeles, is capable of converting up to 200,000 gallons of liquid food waste per day to renewable energy. It has four 15,000-gallon tanks that receive macerated commercial food waste from various sources. For the past 10 years, each tank has been served by a stainless steel Landia chopper pump that continuously reduces particle sizes and recirculates the tanks. The biogas plant began operating with top-mounted propeller mixers on the digesters; however, this mixing system was proving insufficient. More >>