The central wastewater treatment plant for Kaiserslautern, Germany has a capacity of 210,000 PE (approx. 14 MGD). The plant contains three activated sludge tanks with a total of 22,500 m 3 (796,000 ft 3 ) for biological secondary wastewater treatment. Tasks and Requirements Due to the age of the existing fine bubble membrane diffusers, the system needed to be replaced in all three activated sludge tanks. In addition, significant energy sa

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