Ranran Wang, Fan Zhang, Zhuran Hu, Feng Han, Bin Guo, Koichi Takaki , Kefeng Yu,Chengxia Miao, Qin Hou

Abstract

This study presents a simple method for treating NH3-N wastewater using bubble discharge plasma and introduces a wastewater treatment system. The impacts of pH, voltage, pulse frequency, and reaction time on the treatment of NH3-N wastewater were investigated using simulated wastewater samples. The concentrations of NH3-N, total N, and by-products were measured using ultraviolet spectrophotometry. Results indicate that NH3-N was more easily oxidised by the reactive species generated in an alkaline environment. The generated •OH were captured using salicylic acid. Increasing the voltage and discharge frequency promoted •OH generation, thereby facilitating the NH3-N removal through oxidation reactions. The effect of the plasma was verified by a quenching experiment, and the optimal reaction efficiency was achieved at a pH of 12, voltage of 12 kV, and pulse frequency of 160 Hz. The NH3-N removal rate reached 99.14 % after 50 min of treatment; hence, the wastewater treatment was successful.

Paper Linkage:https://authors.elsevier.com/c/1jUm37taLYXQOw