METHOD FOR COMPLEX DISINFECTION OF HOUSEHOLD EFFLUENT Russian patent published in 2011 - IPC C02F3/02 C02F9/14 

FIELD: chemistry.

SUBSTANCE: invention relates to waste water treatment and can be used to biologically disinfect domestic waste water. The disinfection process is carried out in aerated containers in three steps. At the first step, household effluent is mixed with active sludge in a bioreactor 1 under the following conditions: active sludge volume from 20 to 60%, contact time 90 minutes, oxygen concentration not less than 3 mg/l. At the second step, the stream of household effluent and active sludge are mixed with fresh active sludge and industrial effluent in ratio 45:10:45 in a mixer 2. At the third step, new portions of active sludge and industrial effluent act on the treated stream of household effluent in an aerotank 3 such that, the volume of the active sludge in the aerotank 3 is kept not less than 60%.

EFFECT: invention enables to disinfect household effluent and achieve degree of purity which meets sanitary-hygienic and environmental requirements for discharge into water bodies.

5 tbl, 1 ex, 1 dwg