@book{1441,
	author = {Water Environment Federation.},
	title = {Activated sludge /},
	publisher = {Water Environment Federation,},
	year = {2002},
	series = {WEF manual of practice ;},
	address = {Alexandria, VA :},
	edition = {2nd ed.},
	url = {https://app.knovel.com/hotlink/toc/id:kpAS000041/activated-sludge-wef/activated-sludge-wef}
}