PROCESS OF CLEANING WASTE WATERS TO REMOVE AMMONIUM SALTS, NITRATES, AND NITRITES Russian patent published in 2008 - IPC C02F3/32 C02F101/16 

FIELD: waste water treatment.

SUBSTANCE: process comprises treatment of water with activated sludge in air tanks and secondary settlers and post-treatment of water by contacting it with higher aquatic plant, in particular water-immersed Vallisneria spirlis. Post-treatment is carried out simultaneously with treatment in secondary settlers. Density of plant growth is 7-14 kg in 1 m³ of structure volume. At waste water intake 11 m³ per 1 m³ of piscine, 1 m³ of plant daily absorbs 2.71 g nitrogenous substances.

EFFECT: enhanced waste water treatment efficiency.

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