Our previous studies have shown that better productivity can be obtained with centrate than
with primary influent or secondary effluent [8, 9]. This study was conducted at the Metro
Plant where centrate was made available to us. MCES operates seven wastewater treatment
facilities and treats an average of approximately 250 MGD wastewater. The St. Paul Metro
Plant is the largest facility in the system with a 185-MGD treatment capacity. The Metro
plant utilizes a biological phosphorus removal system to meet its discharge limit of 1 mg/L
total phosphorus on a 12-month rolling average. The sludge generated at the Metro plant
are dewatered using centrifuges and then combusted in fluid bed incinerators equipped with
heat recovery boilers. This process requires no additional inputs of fuel and creates heat and
electricity for the buildings.
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