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The removal of OCPs in water by coagulation with poly ferric sulfate |
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Abstract Response surface methodology (RSM) was employed to optimize the various factors affecting the removal of organic chlorine pesticides (OCPs) pollutants in enhanced coagulation process with poly ferric sulfate (PFS) as the coagulant, such as pH value, turbidity, coagulant dosage and the initial concentration of OCPs. The optimization results show that the interactions of the factors were significant, the optimal conditions were: pH 5.0, the turbidity of raw water 150NTU, dosage 12mg/L and initial concentration of OCPs 200ng/L. Under these conditions, the OCPs in water could be removed effectively. The model validation experiment shows that the removal rate of α-HCH reached 82.23%, β-HCH 71.15%,γ-HCH 77.28%, δ-HCH 86.27%, p,p’-DDE 93.78%, respectively. Combined with fractal dimension and zeta potential measures, the analysis shows all factors reached the optimum.
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Received: 12 December 2014
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