Pulsed corona discharge: an advanced treatment method for antibiotic-contaminated water

IF 3.1 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Physics D: Applied Physics Pub Date : 2024-08-06 DOI:10.1088/1361-6463/ad6882
Florin Bilea, Corina Bradu, Andrei V Medvedovici, Dunpin Hong and Monica Magureanu
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Abstract

Water pollution is one of the most significant problems of the current century. With the increase in medicine availability and use, pharmaceutical pollutants such as antibiotics become more prevalent in natural environments with potentially negative impact. In this study, a pulsed corona discharge was investigated as a possible treatment method of water contaminated with amoxicillin (AMX). Two system configurations were used: plasma and plasma-ozonation. In order to better grasp the effect of system and water matrix on degradation, different pulse widths, solutions pH and conductivity values, as well as the nature of the dissolved salts were investigated. Decreasing the pulse width from 300 ns to 106 ns (full width at half maximum) led to almost a two-fold increase in energy yield at 50% pollutant removal, and the addition of the ozonation reactor resulted six times enhancement in efficiency. While the water matrix had little impact on AMX degradation, the buffering capacity of carbonates has proven beneficial by preventing pH decrease during treatment. Under optimum conditions, the energy yield was 57 g kWh−1 at 93% removal of AMX in tap water. A number of 26 potential degradation products have been identified, resulting from hydroxylation of the benzene ring, oxidation of the thioester and amine groups, hydrolysis, and cleavage of the benzene, β-lactam and thiazole rings, along with fragmentation of the resulting compounds. All but seven degradation intermediates are completely removed by extending treatment duration to 60 min and the persistent ones are less toxic than the parent compound.
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脉冲电晕放电:抗生素污染水的先进处理方法
水污染是本世纪最重要的问题之一。随着药品供应和使用的增加,抗生素等药物污染物在自然环境中变得越来越普遍,并可能产生负面影响。本研究将脉冲电晕放电作为处理受阿莫西林(AMX)污染的水的一种可能方法进行了研究。采用了两种系统配置:等离子和等离子-臭氧。为了更好地掌握系统和水基质对降解的影响,研究了不同的脉冲宽度、溶液 pH 值和电导率以及溶解盐的性质。将脉冲宽度从 300 毫微秒降低到 106 毫微秒(半最大全宽),在污染物去除率为 50%的情况下,能量产量几乎增加了两倍,而增加臭氧反应器则使效率提高了六倍。虽然水基质对 AMX 降解的影响很小,但碳酸盐的缓冲能力可防止处理过程中 pH 值下降,因此证明是有益的。在最佳条件下,自来水中 AMX 的去除率为 93%,能量产量为 57 g kWh-1。通过苯环的羟基化、硫酯基和胺基的氧化、水解、苯环、β-内酰胺环和噻唑环的裂解以及由此产生的化合物的碎片化,确定了 26 种潜在降解产物。将处理时间延长至 60 分钟后,除七种降解中间体外,所有降解中间体都会被完全去除,而且持续存在的降解中间体的毒性低于母体化合物。
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来源期刊
Journal of Physics D: Applied Physics
Journal of Physics D: Applied Physics 物理-物理:应用
CiteScore
6.80
自引率
8.80%
发文量
835
审稿时长
2.1 months
期刊介绍: This journal is concerned with all aspects of applied physics research, from biophysics, magnetism, plasmas and semiconductors to the structure and properties of matter.
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