Pretreatment of landfill leachate by using the composite of poly ferric sulfate and bioflocculant MBFR10543

In this study, considering humic acids (HA) removal as well as some traditional indexes such as COD, color, and turbidity removals from landfill leachate, potential of the composite of alkaline-thermal-treated sludge (as a bioflocculant) and poly ferric sulfate (PFS) was studied in leachate pretreatment. Results showed that this composite could remove COD, HAs, color, and turbidity from the leachate by 72.6, 79.3, 64.9, and 85.1%, respectively, under the condition of bioflocculant of 19.3 mg L−1, PFS of 12.7 g L−1, pH 6.9, and agitation speed of 202 rpm, which was optimized by response surface methodology. The appreciable removal of COD and HA indicated that the coagulation–flocculation process as a pretreatment could effectively remove recalcitrant compounds from landfill leachate.