Immobilization of activated sludge by PVA-boric acid method.
A new method (polyvinyl alcohol-boric acid method) for an inexpensive and effective immobilization of activated sludge was developed. Using activated sludge immobilized by this PVA-boric acid method, synthetic waste-water was treated at a high loading rate of 0.5-2.35 kg TOC/m(3) day. Total organic carbon and total nitrogen were removed at efficiencies of 93 and 30-40%, respectively. The kinetic constants Y and b for this immobilized activated-sludge process were determined to be 0.594g mixed liquor suspended solids (MLSS)/g TOC and 0.0219 day(-1), respectively. The cost calculation of chemicals required for the immobilization of activated sludge by this PVA-boric acid method was proved to be extremely inexpensive for the immobilization of activated sludge.
Hashimoto
S
S
Department of Environmental Engineering, Faculty of Engineering, Osaka University, 2-1 Yamada Oka Suita-shi, Osaka 565, Japan.
Furukawa
K
K