Wastewater leftovers power electricity/steam generator Johnson Controls has developed a combined heat and power plant in Baltimore that uses the residual of treated wastewater as fuel. The plant will generate more than 2.4 megawatts of electricity per year, provide steam to offset process heating requirements and produce hot water for boilers. As an added bene? t, the digester gas cogeneration plant at Baltimore’s Back River Wastewater Tre

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