ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Employing electro-peroxone process for industrial wastewater treatment: a critical review

Aref Shokri and Mahdi Sanavi Fard

Jundi-Shapur Research Institute, Dezful, Iran

E-mail: aref.shokri3@gmail.com

Received: 14 February 2022  Accepted: 4 May 2022

Abstract:

Recently, the electro-peroxone process has advent rapidly as an efficient and new electrochemical advanced oxidation process (EAOP) to treat pollutants, which is operated through in situ generations of H₂O₂ from cathodic O₂ reduction during the ozonation process. The electro-generated hydrogen peroxide leads to the improvement in ozone transformation to hydroxyl radical; hence, the electro-peroxone can considerably improve the treatment performance, total organic carbon (TOC) mineralization, and reduction of ozone-resistant emerging pollutants compared with the traditional ozonation process. Moreover, the main disadvantage of the traditional ozonation process for water treatment is bromate generation during the treatment of bromide-containing water sources, which can be remarkably decreased by the application of this technology. Additionally, because of its enhanced kinetics of contaminant degradation, electro-peroxone offers a more secure, time-efficient, energy-saving, and effective alternative for the reduction of emerging pollutants, compared with different ozone-dependent AOPs including traditional UV/O₃ and peroxone (O₃/H₂O₂) methods. Hence, it can offer a suitable, eco-friendly, and cost-effective approach to markedly enhance the efficiency of the current ozonation process. This paper reviews the principles of the electro-peroxone process and compares its efficiency with other methods. The essential reaction mechanisms and experimental parameters that are crucial to the operation, realization, and design of the electro-peroxone, including ozone dosage, applied current, injected ozone flowrate, electrolyte type, electrode setup, solution pH, and type of cathode and anode on electro-peroxone efficiency, are investigated. Moreover, the application of electro-peroxone for water and wastewater treatment is explored. Finally, the challenges in wide-ranging application of electro-peroxone, the future research direction, and its incorporation in wastewater and water treatment systems for viable application are discussed.

Keywords: Electro-peroxone; Synergetic effect; Advanced oxidation processes (AOPs); Hydroxyl radical; Wastewater treatment; Emerging contaminants

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02269-y

Chemical Papers 76 (9) 5341–5367 (2022)