... - A STUDY ON SOLUBILIZATION OF EXCESS SLUDGE BY HIGH SPEED ROTARY DISK PROCESS T. Imai*, M. Fukagawa**, M. Ukita*, M. Sekine*, T. Higuchi*, and T. Kawamura*** Dept. of Civil Engineering, Yamaguchi ... 852-854.Standard Methods for the Examination of Water and Wastewater (1992). 18th edn, American Public HealthAssociation/American Water Works Association/Water Environment Federation, Washington DC, ... Tokiwadai, Ube, Yamaguchi 755-8611, JAPAN** Ube National College of Technology, Tokiwadai, Ube, Yamaguchi 755-8555, JAPANABSTRACTThis study describes the solubilization of excess sludge by high...