8Verrelli D I, Dixon D R, Scales P J. Assessing dewatering per- formance of drinking water treatment sludges [ J ]. Water Re- search ,2010,44 (5) : 1542-1552.
9Zhao Y Q. Enhancement of alum sludge dewatering capacity by using gypsum as skeleton builder [ J ]. Colloids and Surfaces a- Physicochemical and Engineering Aspects, 2002,211 ( 2 -3 ) : 205-212.