Electro-peroxone treatment of rice grain based distillery biodigester effluent: COD and color removal

This work attempts to treat biodigester effluent (BDE) using electro-peroxone processes with respect to COD and color removal. During the process aluminium is used as anode and carbon-PTFE (polytetrafluoroethylene) is used as cathode with the combination of ozone. Experiments are performed at different conditions such as changing cathode material and electrolytes. At the optimum condition COD and color removal efficiency achieved was 99.9% and 91.3%, respectively with 3.8 kWh/m3 of energy consumption, current density of 32 A/m2, initial COD concentration of 6000 mg/dm3, initial pH of 6, O3 concentration of 135 mg/dm3, Na2SO4 concentration of 0.15 M, stirring speed of 100 rpm, and electrolysis time of 50 min in the electro-peroxone process. Finally, potential of electro-peroxone process, sludge analysis and cost optimization are also described in the present article. [Display omitted] •Electro-peroxone process is effectively reduced the organics content from the rice grain based distillery waste water.•Mechanism and cost analysis of environment friendly electro-peroxone process are detailed.•Design parameters of electro-peroxone process are also detailed.