NITRATE REMOVAL FROM AQUARIUM WATER Russian patent published in 2009 - IPC C02F3/02 C02F3/10 C02F1/28 C02F1/70 

FIELD: chemistry.

SUBSTANCE: invention concerns medium for removal or reduction of non-organic nitrogen compounds, particularly nitrates, from biological aquaculture water, represented by biodegradable polycaprolactone (PCL) polymer, and direct application of the medium in aquariums for plant and fish cultivation in aerobic environment. In preferable version, polycaprolactone is added to bottom ground in pellet form in amount from 20 g to 200 g per 100 litres of aquaculture water in aerobic conditions. Bottom ground consists of gravel with particle size from 1 to 8 mm, while poly caprolactone is added to aquaculture water in powder, powder suspension, paste composition or large-scale coating form. Biodegradable PCL polymer is added to aquaculture water in amount of 5 to 20 mg per litre of water. Filtering medium for biological aquaculture water applied directly in aquariums under aerobic conditions contains PCL. Filtering medium is preferably used in the form of homogeneous mix of filtering material, such as gravel with particle size from 2 to 5 mm, and PCL in amount from 25 to 75 volume %.

EFFECT: application of polycaprolactone in biological aquaculture water under aerobic conditions ensures almost continuous denitrification.

23 cl