FIELD: wastewater purification.
SUBSTANCE: invention relates to the biological purification of household wastewater and wastewater close to them in composition; it can be used to purify wastewater of individual residential buildings, cottages, recreation centers, health resorts, shift settlements. A method for deep biological purification of household wastewater is characterized by that wastewater is fed into a facility that includes a wastewater reception zone, in which wastewater is averaged, a zone of hydrolysis and fermentation of sediments for the extraction of easily oxidized organic matter, in which processing is carried out for three days, zones of denitrification, dephosphatization and nitrification processes in one compartment without partitions or in one compartment with partitions, while the denitrification stage is carried out before the nitrification stage, denitrification and dephosphatization processes are provided by precipitation and sludge formed during the purification process with a decrease in the amount of precipitation formed during wastewater purification, wherein water processing is carried out using activated sludge being suspended or using attached sludge, a zone of separating activated sludge and purified water, followed by recycling of sludge into the denitrification zone, zones of post-purification and disinfection of wastewater. A purification installation includes an averager, a primary settling tank, an aerotank with anaerobic-aerobic purification zones for denitrification, dephosphatization and nitrification processes, a secondary settling tank for separation of activated sludge and purified water, devices for recycling activated sludge into the denitrification zone, units for post-purification and disinfection of wastewater.
EFFECT: reduction in sediment and excess activated sludge formed during wastewater purification, ensuring high efficiency of removal of pollutants, reliable wastewater purification.
13 cl, 2 dwg
