Thomas, John L. Activated sludge-bio-disc treatment of distillery wastewater Jhon l. Thomas and Lawrence G. Koehrsen - Washington : Office of Research and Development, 1974 - 93 p. : ills. ; 28 cm. - Water pollution control research series . Includes bibliographical references. Subjects--Topical Terms: Sewage--Purification--Activated sludge process. Dewey Class. No.: 628.354