Mixed industrial wastewater treatment by combined electrochemical advanced oxidation and biological processes
Amishi Popat1, P V Nidheesh2, T S Anantha Singh3
1CSIR, National Environmental Engineering Research Institute, Nagpur, Maharashtra, India; Department of Civil Engineering, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, India.
Abstract:
Nowadays, because the quality and quantity of mixed industrial wastewater keep fluctuating in recent times, the treatment of mixed industrial wastewater has gained more attention. The main target of this study is to degrade the wastewater through a combination of electrochemical advanced oxidation processes (EAOPs) and biological treatment. To enhance the biodegradability of the wastewater, Electro-Fenton process, along with external persulphate addition, was applied before the biological treatment. The effect of voltage, catalyst concentration and persulphate dosage was studied. The optimized conditions selected for the experiments were pH-3, effective area-25 cm2, electrode spacing-1 cm while voltage-10 V, persulphate dosage-200 mg L-1, and catalyst dosage-10 mg L-1 were optimized during the experiments leading towards 60% of COD removal efficiency in course of 1 h of electrolysis. Addition of tert-butyl alcohol and ethanol revealed the existence of sulphate and hydroxyl radicals as the major oxidants that help in pollutant degradation by combining EAOPs and biological treatment. Overall 94% COD removal efficiency was achieved. Therefore, for the organic pollutant degradation, combined process serves to be an efficient and effective treatment option.
Related Concept Videos
What is an Electrochemical Gradient?
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
Oxidation Numbers
Pyruvate Oxidation
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
What is Conservation Biology?
Oxidation-Reduction Reactions
Microorganisms in Agriculture and Food industry


