School of Environment and Architecture, University of Shanghai for Science and Technology, No. 516 Jungong Rd., Shanghai, 200093, PR China.
Department of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
Environ Res. 2020 Apr;183:109205. doi: 10.1016/j.envres.2020.109205. Epub 2020 Jan 31.
In this study, iron foam combined ozonation was employed as an advanced oxidation process to treat the organic contaminants in real pharmaceutical wastewater. It was found that this procedure worked well in a wide range of pH, the existence of iron foam in ozonation system markedly elevated the mineralization level of organic contaminants. Within the reaction time of 120 min, iron foam combined ozonation achieved 53% of DOC removal percentage, which was 21% higher than that of ozone alone. Meanwhile, the biodegradability of the pharmaceutical wastewater was improved, a large part of the organic pollutants containing benzene rings and amino groups were effectively degraded, and a certain amount of phosphate and nitrogen also get removed. In iron foam combined ozonation, zero valent iron played the role as an activator. It was oxidized into iron oxides and oxyhydroxides, the electrons transferring among different valences of iron stimulated the decomposition of ozone and the generation of hydroxyl radicals, which accounted for most of the organic contaminants degradation.
在这项研究中，铁泡沫联合臭氧氧化被用作一种高级氧化工艺来处理实际制药废水中的有机污染物。研究发现，该工艺在很宽的 pH 范围内都能很好地发挥作用，臭氧氧化体系中存在铁泡沫显著提高了有机污染物的矿化水平。在 120 分钟的反应时间内，铁泡沫联合臭氧氧化法对 DOC 的去除率达到了 53%，比单独臭氧氧化法高出 21%。同时，制药废水的可生化性得到了改善，含苯环和氨基的大部分有机污染物得到了有效降解，同时也去除了一定量的磷酸盐和氮。在铁泡沫联合臭氧氧化中，零价铁起到了活化剂的作用。它被氧化成铁的氧化物和氢氧化物，不同价态的铁之间的电子转移刺激了臭氧的分解和羟基自由基的生成，这两者是有机污染物降解的主要原因。
