A Comparative Study of Peroxi-coagulation and Peroxi- photo coagulation Methods for Treatment of Petrochemical RO Reject: Optimization and Kinetic Study

Abstract

This study elucidates a comparative study of peroxi-coagulation and peroxi- photo -coagulation methods for the reduction of total dissolved solids from petrochemical reverse osmosis (RO) reject. All experiments were done in a batch reactor incorporating an iron anode and a graphite cathode, whereas the solution was also irradiated with UV light during peroxi- photo-coagulation process. Independent parameters such as pH, current density, electrode gap, and electrolysis time were optimized by Central Composite Design of Design Expert Software was applied for peroxi coagulation process and optimum operating conditions obtained. Peroxi- photo-coagulation treatment was performed at the same optimum conditions obtained during peroxi coagulation treatment. The present study reveals that photo peroxi coagulation process was found more efficient than peroxi coagulation process in order to get maximum removal of total dissolved solids from RO reject. Maximum removal of total dissolved solids was attained 63.19% during photo peroxi coagulation treatment and 52.78% during peroxi coagulation treatment at optimum operating conditions. Kinetic study was performed at optimum operating conditions and 2nd order kinetic model was best fitted to describe the removal rate.