Experiment Study on the Flocculent Deposition of Dredged Sediment in Tongji Bridge Reservoir

摘要

This test explored suitable flocculating settling technological parameter for dredge d sediment in Tongji Bridge Reservoir. It referred to sewage treatment plant's sludge treatm ent methods, and used PAM, PAC, FeCl_3, MgCl_2, Na_2CO_3, Ca(OH)_2 and KMnO_4 as floccula nts to improve water quality. Through single and mixed experiments, this paper studied floc culants' influence on sludge setting rate and supernatant liquor. The result shows that anioni c PAM's setting rate is faster than other flocculants, but its supernatant turbidity is high. T he effect of FeCl_3, PAC, KMnO_4 is poorer than PAM, however they have better water purif ication effect. In view of sedimentation, argillaceous improvement and clarification, this pap er chooses three groups of flocculants, which are group two PAM+PAC+MgCl_2, group three PAM+PAC+Ca(OH)_2, and group four PAM+PAC+Na_2CO_3+Ca(OH)_2. Therefore, this paper c an provide a simple and feasible way for the rapid dewatering of dredged sediment, which is convenient for sediment's disposal and resource utilization.