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plastic Mbbr bio filter media Feb 02, 2018 The so-called primary sewage is the urban direct discharge of untreated life or industrial waste water, at this stage of the use of raw sewage directly into the sewage source heat pump system for heat transfer, in the case of a small amount of electricity consumption for urban buildings indoor refrigeration heating. There are several technical difficulties to be overcome in wastewater reuse: blockage, corrosion, heat transfer efficiency. Municipal sewage directly into the sewage heat exchanger for heat transfer, in exchange for heat from the sewage source heat pump internal heat pump work to pass into the room.