Hybrid hydrodynamic cavitation (HC) technique for the treatment and disinfection of lake water

Yogesh Patil; Shirish H Sonawane; Perugu Shyam; Xun Sun; Sivakumar Manickam

doi:10.1016/j.ultsonch.2023.106454

Hybrid hydrodynamic cavitation (HC) technique for the treatment and disinfection of lake water

Ultrason Sonochem. 2023 Jul:97:106454. doi: 10.1016/j.ultsonch.2023.106454. Epub 2023 May 30.

Authors

Yogesh Patil¹, Shirish H Sonawane², Perugu Shyam³, Xun Sun⁴, Sivakumar Manickam⁵

Affiliations

¹ Department of Chemical Engineering, National Institute of Technology Warangal, Telangana 506004, India.
² Department of Chemical Engineering, National Institute of Technology Warangal, Telangana 506004, India. Electronic address: shirish@nitw.ac.in.
³ Department of Biotechnology, National Institute of Technology Warangal, Telangana 506004, India.
⁴ Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China. Electronic address: xunsun@sdu.edu.cn.
⁵ Petroleum and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Bandar Seri Begawan BE1410, Brunei Darussalam.

Abstract

Water reclamation from lakes needs to be accomplished efficiently and affordably to ensure the availability of clean, disinfected water for society. Previous treatment techniques, such as coagulation, adsorption, photolysis, ultraviolet light, and ozonation, are not economically feasible on a large scale. This study investigated the effectiveness of standalone HC and hybrid HC + H₂O₂ treatment techniques for treating lake water. The effect of pH (3 to 9), inlet pressure (4 to 6 bar), and H₂O₂ loading (1 to 5 g/L) were examined. At pH = 3, inlet pressure of 5 bar and H₂O₂ loadings of 3 g/L, maximum COD and BOD removal were achieved·H₂O₂ was observed to significantly improve the performance of the HC when used as a chemical oxidant. In an optimal operating condition, a COD removal of 54.5 % and a BOD removal of 51.5 % using HC alone for 1 h is observed. HC combined with H₂O₂ removed 64 % of both COD and BOD. The hybrid HC + H₂O₂ treatment technique resulted in a nearly 100% removal of pathogens. The results of this study indicate that the HC-based technique is an effective method for removing contaminants and disinfection of the lake water.

Keywords: Advanced oxidation process; Disinfection; Hydrodynamic cavitation; Reactive oxygen species; Surface water.