Search Results       Your search for [author]Hnel, Klaus, 1939- returned 1 record.           Biological treatment of sewage by the activated sludge process /: Ellis Horwood series, water and wastewater technology _ Biologische Abwasserreinigung mit Belebtschlamm. English. by Hnel, Klaus, 1939-; Chichester, West Sussex, England: Halsted Press, 1988. Subject: Sewage--Purification--Activated sludge process.          Add to Book Cart Relevance: 27.28%