Improved electroflotation for the removal of suspended solids from algal pond effluents

Experiments with a patented modification of an electroflotation cell showed that the power requirements for the treatment of pond effluents were less than for other electroflotation methods. The relationship between current densities and removal efficiencies of algae in suspension was found in laboratory and pilot-scale experiments. It was found that simultaneous flocculation-electroflotation gives better results than consecutive operation. The results obtained with electroflotation even with low current densities were almost equal to dissolved air flotation. It is believed that better adherence of electrolytically produced gases to the floc is responsible for the superiority of electroflotation.