METHOD FOR CONSECUTIVE ADDITIONAL PURIFICATION OF USUAL AND INDUSTRIAL SEWAGE AFTER THEIR BIOLOGICAL PURIFICATION AGAINST SUSPENDED MATERIALS, ORGANIC IMPURITIES, AMMONIUM NITROGEN AND PHOSPHATE PHOSPHOROUS Russian patent published in 1998 - IPC

FIELD: additional purification of usual and industrial sewage after their biological purification against suspended materials, ammonium nitrogen, phosphate phosphorous and organic impurities. SUBSTANCE: biological purification of sewage is followed by its additional purification which takes place with the help of sorbents being used rigorously one after another. To extract suspended materials and organic impurities carbon-containing sorbent is used, to extract ammonium nitrogen cationite being used. For extraction of phosphate phosphorous is used filler, on its surface chemosorption takes place. Sewage being affected by additional purification comprises, mg/l: suspended materials, 2.5-4.5; ammonium nitrogen, 0.15-0.49; phosphate phosphorous, 0.03-0.18. EFFECT: improved efficiency of the method. 2 dwg