Research on the Dehydration Test of Dredged Sediment in Dian Lake

[Objective]The technological parameter suitable for the dewatering of dredged sediment in Dian Lake was studied.[Method]By means of the treatment method of sewage sludge in sewage treatment plant,flocculants including FeCl3,Al2(SO4)3 and PAM were taken as dewatering agents which were added in dredged sediment.[Result]The results showed that Al2(SO4)3 had better dewatering effect than FeCl3 and PAM,and the optimum dosing quantity of Al2(SO4)3 in dredged sediment was 170 mg/L,in addition,the supernatant could meet the first class B standard of GB18918-2002 and be discharged directly to nature water without pollution.[Conclusion]Our study could provide a simple and feasible way for the rapid dewatering of dredged sediment in Dian Lake,which would be convenient for the disposal and resource utilization of dredged sediment.