00309nam a2200121Ia 4500008004100000041000800041082001400049100001500063245003200078250001400110260003900124650002400163230711s9999||||xx |||||||||||||| ||und||  aENG  a621bCH-B  aChambers.B 0aBulking of activated sludge  a1st . Ed.  c1982aNew YorkbEllis Horwood Ltd  aGENERAL ENGINEERING