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Study on coagulation behavior of fly ash-silicon-ferric coagulant in treating lead wastewater
TAN Juan, YU Yan-zhen, CHENG Lei
(School of Civil Engineering and Architecture in University of Jinan, Jinan 250022, China)
Abstract:
Fly ash-silicon-ferric coagulant with various Si/FeO42-molar ratio (n(Si)/n(FeO42-)) was prepared by fly ash extract and K2FeO4. The influence of Si/FeO42-molar ratio on coagulation efficiency of lead wastewater treatment was investigated. The coagulation efficiency was compared using fly ash-silicon-ferric coagulant as coagulant in treating lead wastewater and that using poly ferric phosphate sulfate (PFPS) as coagulant. The results show that the removal of turbidity, color and Pb2+ for lead wastewater is over 90% when n(Si)/n(FeO42-) varies from 3.5 to 5.0. The flocs of fly ash-silicon-ferric coagulant have large diameter, high sedimentation rate and good performance to deal with the lead wastewater in comparison with that using PFPS. Fly ash-silicon-ferric coagulant gives more Pb2+ removal rate of 10%-20% than PFPS at given dose range in treating lead wastewater.
Key words:  water treatment  fly ash-silicon-ferric coagulant  lead wastewater  coagulation experiment