Zhao, Y.Q.Y.Q.ZhaoAllen, StephenStephenAllenSun, GuangzhiGuangzhiSun2011-10-282011-10-282004Journal of Guangzhou University (Natural Science Edition)1671-4229http://hdl.handle.net/10197/3269Problems concerning the management and utilization of sludge derived from water treatment processes are still not fully solved. A common approach is direct discharge to a landfill site. This study provides experimental data to demonstrate the effectiveness of a combination of gypsum (CaSO4x2H2O) and an organic polymer in alum sludge conditioning and dewatering. Experimental results demonstrated that the filterability of dually conditioned alum sludge was significantly improved by the addition of gypsum at a 1:1 ratio (WT/WT) to original sludge solids. Dewatering tests showed that a further decrease of almost seven percentage of sludge cake equilibrium moisture content was achieved by the involvement of gypsum compared to the situation of single polymer conditioning. The importance of this study lies in the possible application of dewatered alum sludge to land use or as a filter medium in constructed wetland for wastewater treatment, providing a positive solution to the problem of alum sludge disposal.183926 bytesapplication/pdfenAlum sludgeConditioningDewateringGypsumPolymerSettlingSkeleton builderWater treatment plant residualsSewage sludge--ConditioningGypsumPolymersJournal Article32137142https://creativecommons.org/licenses/by-nc-sa/1.0/