Optimized treatment of wastewater containing natural rubber latex by coagulation-flocculation process combined with Fenton oxidation

In this study,the effectiveness of combined coagulation-flocculation (cf) and fenton oxidation (fo) in the treatment of wastewater containing natural rubber latex (nrl) was evaluated. wastewater samples were collected from a rubber glove manufacturing factory with cod of 688 mg l-1. response surface methodology (rsm) with a two-variable,five-level central composite design (ccd) was employed to study and optimize the cf process using alum,ferric chloride,and poly aluminum chloride as the coagulants. the results showed that maximum cod reduction (56.06%) was obtained using alum at the optimal condition of 560 mg l-1 coagulant dose and ph 8.4. fenton oxidation process was applied to the wastewater after coagulation. the process was optimized by rsm using a three-variable,three-level box-behnken design (bbd). maximum cod reduction (78.26%) at this stage was obtained under treatment conditions of h2o2 1257 mg l-1,h2o2/ fe2+ ratio 2.31,and 76 min. final cod of the treated effluent was 68.6 mg l-1. the integrated technique consisted of cf and fo processes was proved to be efficient for the treatment of latex-containing wastewater with 90.03% cod reduction. the proposed method can be used to treat the nrl wastewater to a suitable quality for reuse in the manufacturing process. © 2017,university of mohammed premier oujda morocco.