difference between primary and secondary utility treatment plants
In conventional secondary treatment processes, most of the electricity is used for aeration, pumping systems and equipment for the dewatering and drying of sewage sludge. Advanced wastewater treatment plants, e.g. for nutrient removal, require more energy than plants that only achieve primary or secondary treatment.
Primary wastewater treatment. The first step in modern wastewater treatment, primary treatment removes solids that are suspended in the wastewater. First the waste is screened to remove larger objects, then grit is removed, and finally the rest of the solids are extracted using gravity in large sedimentation tanks. Contents.