Activated sludge / 
prepared by Activated Sludge Task Force of the Water Environment Federation under the direction of the Municipal Subcommittee of the Technical Practice Committee 
 - 2nd ed. 
 - Alexandria, VA :  Water Environment Federation,  2002 
 - 1 online resource (xviii, 211 pages) :  illustrations 
 - WEF manual of practice ;  no. OM-9 .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781523102860 1523102861 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage--Purification--Activated sludge process--Handbooks, manuals, etc.