an environmentally sound approach for managing sewage treatment plant sludge : an introductory guide for decision-makers United Nations University International Network on Water, Environment and Health text series technical report ja Osaka, Japan United Nations Environment Programme, Division of Technology, Industry and Economics, International Environmental Technology Centre 2002 continuing eng 14 p. : ill. United Nations University and International Network on Water, Environment and Health Sewage sludge Sewage disposal plants TD170 U536 no.1 UNEP International Environmental Technology Centre. 9280721666 050405 20260817171547.0