METHOD OF BIOLOGICAL PURIFICATION OF HOUSEHOLD-FECAL SEWAGES WITH SHARPLY CHANGING IN TIME CONSUMPTIONS AND COMPOSITIONS Russian patent published in 2013 - IPC C02F9/14 C02F3/30 C02F3/34 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of biological purification of household-fecal sewages and can be applied in community facilities for purification of municipal and industrial sewages. Method includes collation of water, settling, averaging its expenditure, processing sewages with communities of hydrobionts from bacteria to zooplankton, afterpurification of water and following disinfection of purified sewages. Air is supplied to stages of bioreactor of multi-sludge system of sewage purification by program, preliminarily formed on the basis of specified values of indicators: content of dissolved oxygen, suspensions, pH, Eh, oxidability and content of nitrogen ammonium and nitrate, which are updated daily. Value of Eh medium in wire-brush nozzle by impulse supply of air in bubblers is supported at level +50…+120 mV at the stage of denitrification and introduction of anammox process, and not less than +300 mV at stage of nitrification termination. Recirculation flow of nitrificated discharge return is assigned by ratio (N-NH₄ ⁺)"вх"/10. Discharge pH value at the stage of nitrification termination is supported not less than 7. Carrying out of suspensions from stages of sewage afterpurification is not allowed to be over 3 mg/l, with N-NH₄ ⁺ concentration being not higher than 0.4 mg/l.

EFFECT: invention makes it possible to increase stability of operation of purifying stations and regulate their exploitation.

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