BIOSORPTION FILTER FOR PURIFICATION OF SEWAGE Russian patent published in 2002 - IPC

FIELD: environmental control; method of purification of sewage formed at areas of burial of solid domestic wastes. SUBSTANCE: filter has housing with supply branch pipe fitted with injectors for smooth distribution of sewage over area of filter and drainage system discharging purified water. Layers of filter medium are located inside biofilter in the following sequence in way of water flow: fir and asp bark of 5-year storage, slag, saving, sorbent H, gravel, 50-100 mm in size. Filter works in natural aeration mode. EFFECT: enhanced efficiency of purification of sewage. 4 cl, 1 dwg, 1 tbl