PVA(Polyvinyl alcohol) gel is a porous hydrogel that is ideally suited for immobilization of microorganisms essential for the degradation of environment pollutants.
Example shows an existing wastewater plant which has 250m3 activated sludge tank and a 45m3 clarifier. The plant was first designed to treat 150m3/d with an influent BOD’s 1,000mg/L. Now the plant needs to upgrade to treat 300m3/d with same BOD, for which three designs options are shown. A conventional activated sludge system would require about twice the existing tank volume to treat the increased load.