PROCESS OF BIOLOGICAL TREATMENT OF WASTE WATERS Russian patent published in 2004 - IPC

FIELD: waste water treatment.

SUBSTANCE: process involves filtering waste water, settling, treatment with microorganisms and disinfecting treated effluents. Biological treatment is performed using three-sludge systems. First system, provided with settling-type sludge separator, functions with bacterial biocenosis and daily loadings on sludge at least 1 kg of biochemical oxygen demand per 1 kg of ashless substance of sludge. Second sludge system, provided with settling-type sludge separator, functions with nitrification-denitrification biocenosis, including association of heterotrophic and autotrophic bacteria, protozoa, and small organisms belonging to third trophic level, and daily loadings on sludge at least 200 g of biochemical oxygen demand per 1 kg ashless substance of sludge. Third system functions with nitrification and mineralization biocenosis preferably consisted of aquatic organisms belonging to third trophic level, animal plankton fixed in fibrous filler contained in construction space with daily loadings not superior to 1 kg dry substance of animal plankton, further provided with bubbler system, lines for removing faeces, pseudo-faeces, and died-off animal plankton toward waste water sediment treatment plants. Withdrawal of sediments is only effected from bioreactors of third sludge system.

EFFECT: increased efficiency of removal of biogenic elements from water, prepared high-ash non-decaying, rich in biogenic elements, waste water sediments, diminished volume of construction, and reduced power consumption.

2 cl, 1 dwg