Effect of dielectric barrier discharge plasma on persulfate activation for rapid degradation of atrazine: Optimization, mechanism and energy consumption

Tianyao Shen; Xiaojing Wang; Peng Xu; Chunyan Yang; Jiaqin Li; Peng Wang; Guangshan Zhang

doi:10.1016/j.envres.2022.113287

Effect of dielectric barrier discharge plasma on persulfate activation for rapid degradation of atrazine: Optimization, mechanism and energy consumption

Environ Res. 2022 Sep;212(Pt B):113287. doi: 10.1016/j.envres.2022.113287. Epub 2022 Apr 26.

Authors

Tianyao Shen¹, Xiaojing Wang¹, Peng Xu¹, Chunyan Yang¹, Jiaqin Li¹, Peng Wang², Guangshan Zhang³

Affiliations

¹ State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
² State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China. Electronic address: pwang73@hit.edu.cn.
³ Qingdao Engineering Research Center for Rural Environment, College of Resource and Environment, Qingdao Agricultural University, Qingdao, 266109, PR China.

PMID: 35483407
DOI: 10.1016/j.envres.2022.113287

Abstract

Dielectric barrier discharge plasma (DBDP) is an emerging and promising advanced oxidation process (AOP) for wastewater treatment. After investigating the effect of input voltage, O₃ (generated by dielectric barrier discharge), and peroxydisulfate (PDS) dosage, the DBDP_O3/PDS system was established. With the assistance of PDS, the atrazine (ATZ) removal efficiency increased from 69.67% to 82.46% within 25 min. Synergistic effect calculation suggests that there were markedly synergies between DBDP, O₃_, and PDS. Under the effect of SO₄^-•, the total organic carbon (TOC) removal and dechlorination efficiency were significantly improved. In addition, the DBDP_O3/PDS system maintained the ATZ removal efficiency at a high level over a wide range of initial pH values. According to quenching experiments and electron paramagnetic resonance (EPR) detection, the dominant radical for ATZ degradation in the DBDP_O3/PDS system was HO^•. A possible degradation pathway of ATZ was proposed based on density functional theory (DFT) analysis, quadrupole-time of flight-liquid chromatography/mass spectrometry (Q-TOF-LC/MS) results, and related literature. The acute toxicity to aquatic minnows and the developmental toxicity of intermediate products prediction confirmed that the DBDP_O3/PDS system could effectively reduce ATZ toxicity. The electrical energy per order (E_EO) was 7.10 kWh m^-3 order^-1 illustrating that the DBDP_O3/PDS was a more energy-economic system than other energy-intensive processing technologies.

Keywords: Atrazine degradation; DBDP; DFT; PDS.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Atrazine* / analysis
Atrazine* / toxicity
Chromatography, Liquid
Oxidation-Reduction
Water Pollutants, Chemical* / analysis
Water Purification* / methods

Substances

Water Pollutants, Chemical
Atrazine