METHOD AND AGGREGATE FOR DEEP BIOCHEMICAL SEWAGE PURIFICATION Russian patent published in 1996 - IPC

FIELD: middle size and small towns and separate building sewage deep biochemical purification. SUBSTANCE: initial sewage water during its feeding for primary settling is treated by ozone in amount of 6.0 - 60.0 mg/land then it is fed for aeration into aerotank 8, that causes destruction of complex organic molecules in initial water and breaks aggregating stability of its dispersion system. That results in intensification of suspensions settling processes in primary settler 1 and in additional settler 19 an also bioprocesses in aerotank 8. Sludge mixture in biofilter 10 made in the form of thin layer settling module is separated and biofilm gets into section 11, from which it is fed for recirculation aerator 9 made in the form of water-air ejector. Clarified in secondary settler 12 water is passing through micro filter 13 and collect into tank 14 and reservoir 15 for purified water. In the latter purified water is also subjected to treatment by ozone using ejector 16 and ozonizer 17 in amount of 2.0 - 20.0 mg/l for disinfection and removal of residuals of difficultly oxidizing impurities. Dimensions of aggregate are 1.5 -2.0 times less than dimensions of known such aggregates, power usage is minimum for volumes of less than 10000 m³/ day. EFFECT: significantly decreased dimensions of aggregate and power consumption.