Title of article :
Chemical coagulation of combined sewer overflow: Heavy metal removal and treatment optimization
Author/Authors :
A.G. El Samrani، نويسنده , , B.S. Lartiges، نويسنده , , F. Villieras، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
10
From page :
951
To page :
960
Abstract :
The coagulation of combined sewer overflow (CSO) was investigated by jar-testing with two commercial coagulants, a ferric chloride solution (CLARFER) and a polyaluminium chloride (WAC HB). CSO samples were collected as a function of time during various wet-weather events from the inlet of Boudonville retention basin, Nancy, France. Jar-tests showed that an efficient turbidity removal can be achieved with both coagulants, though lower optimum dosages and higher re-stabilization concentrations were obtained with the aluminum-based coagulant. Optimum turbidity removal also yielded effective heavy metal elimination. However, the evolution with coagulant dosage of Cu, Zn, Pb, Cr, soluble and suspended solids contents followed various patterns. The removal behaviors can be explained by a selective aggregation of heavy metal carriers present in CSO and a specific interaction between hydrolyzed coagulant species and soluble metals. Stoichiometric relationships were established between optimal coagulant concentration, range of optimal dosing, and CSO conductivity, thus providing useful guidelines to adjust the coagulant demand during the course of CSO events.
Keywords :
Combined sewer overflowHeavy metal removalCoagulationFerric chloridePACAlkalinity
Journal title :
Water Research
Serial Year :
2008
Journal title :
Water Research
Record number :
764769
Link To Document :
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