BALLASTED ACTIVATED SLUDGE TREATMENT COMBINED WITH HIGH-RATE LIQUIDS/SOLIDS SEPARATION SYSTEMS

摘要

Described is a method of treating wastewater. The method includes receiving the wastewater at a ballasted activated sludge secondary treatment aeration basin. The method also includes adding a ballast material to the wastewater, treating the wastewater in the ballasted activated sludge secondary treatment aeration basin to produce a ballasted mixed liquor effluent, receiving the ballasted mixed liquor effluent at a high-rate heavy solids removal zone that includes one or more high-rate heavy solids removal units, and removing ballasted heavy solids from the ballasted mixed liquor effluent using the one or more high-rate heavy solids removal units to produce a concentrated ballasted heavy solids effluent and a clarified liquid effluent. Also described is a system for treating wastewater including a ballasted activated sludge secondary treatment aeration basin and a high-rate heavy solids removal zone for treating a ballasted mixed liquor effluent.