Removal of dissolved organic compounds
Dissolved organic compounds (DOC’s) or refractory organics, give the water a characteristic tea-coloured stain. DOC’s are non-biodegradable and accumulate according to feed input, water exchange rate and the rate of solids removal. High levels of DOC’s can stress fish and reduce nitrification efficiencies of the biofilter.
Ozone removes dissolved organics by:
oxidation into products that are more readily nitrified in the biofilter;
including precipitation, which enables removal of waste particles by conventional filtration or sedimentation.