Activated sludge treatment to eliminate phosphates - by mixing with sludge and aerating

摘要

An activated sludge treatment eliminates phosphates from sewage by mixing with sludge and serrating until the microorganisms have absorbed phosphates. The phosphate are released in a settling zone containing an anaerobic sludge layr. When the soluble phosphates have migrated into the upper part of sludge to form a liquid layer, this layer with its phosphate content is removed and the low-phosphate sludge is recycled. The phosphates are released and the high - phosphate aqueous phase is separated from a low - phosphate sludge directly in the settling zone. This saves the time and the apparatus for the separate treatment of a high-phosphate sludge.