Abstract
This paper explores the effect of equivalent initial water content (wei) on the dredged sludge treated by the vacuum preloading-flocculation-solidification combined method (VP-FSCM). The effects of different wei on the deposition, dehydration, strength characteristics, and after-curing water content (wac) of the sludge were studied by the indoor VP-FSCM experiment. The treatment efficiencies of VP-FSCM and curing agent solidified sludge method were compared. The results showed that the deposition and dehydration of the sample were evident in the early and middle stages of VP-FSCM treatment. As wei increased, the deposition, dehydration, and undrained shear strength of the sample gradually increased, and wac decreased first and then increased. After VP-FSCM treatment, the sample exhibited a better curing result than those treated with blast furnace slag (GGBS) and ordinary Portland cement (OPC) solidified sludge method (GCSM). In addition, the curing effect was significantly enhanced as wei increased from 150% to 250%. This study is expected to provide references for the application of the physical consolidation-chemical solidification combined disposal technology, thus facilitating the utilization of the sludge resources.
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