PROCESS FOR BIOLOGICAL TREATMENT OF SEWAGE Russian patent published in 1995 - IPC

FIELD: sewage treatment. SUBSTANCE: process involves successive treatment of sewage jointly with sediment of water supply stations in the amount of 70-80 g/m³ in primary settler, aerotank and in secondary settler; mixture of sediments is aerated before compaction by successive introduction of cation flocculant and nonionogenic flocculant, mole weight (5-6)·10⁶ in equal proportion in the amount 1-1.5 kg/t; the compacted sediment is additionally treated with 1-1.5 kg/t and centrifuged; dehydrated sediment is further treated and utilized and the silt fluid is delivered from the sediment compaction and dehydration stage into sewage before primary settlers. EFFECT: higher degree of sewage treatment from biogenic elements and simultaneous simplification of the process. 4 cl, 4 tbl