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零价铁同时去除半导体酸性废水中的硝酸盐、过氧化氢和磷酸盐

Simultaneous removal of nitrate, hydrogen peroxide and phosphate in semiconductor acidic wastewater by zero-valent iron.

作者信息

Yoshino Hiroyuki, Tokumura Masahiro, Kawase Yoshinori

机构信息

a Research Center for Biochemical and Environmental Engineering, Department of Applied Chemistry , Toyo University , Kawagoe , Saitama , Japan.

出版信息

J Environ Sci Health A Tox Hazard Subst Environ Eng. 2014;49(9):998-1006. doi: 10.1080/10934529.2014.894841.

Abstract

The zero-valent iron (ZVI) wastewater treatment has been applied to simultaneous removal of nitrate, hydrogen peroxide and phosphate in semiconductor acidic wastewaters. The simultaneous removal occurs by the reactions performed due to the sequential transformation of ZVI under the acidic condition. Fortunately the solution pH of semiconductor acidic wastewaters is low which is effective for the sequential transformation of ZVI. Firstly the reduction of nitrate is taken place by electrons generated by the corrosion of ZVI under acidic conditions. Secondly the ferrous ion generated by the corrosion of ZVI reacts with hydrogen peroxide and generates ·OH radical (Fenton reaction). The Fenton reaction consists of the degradation of hydrogen peroxide and the generation of ferric ion. Finally phosphate precipitates out with iron ions. In the simultaneous removal process, 1.6 mM nitrate, 9.0 mM hydrogen peroxide and 1.0 mM phosphate were completely removed by ZVI within 100, 15 and 15 min, respectively. The synergy among the reactions for the removal of nitrate, hydrogen peroxide and phosphate was found. In the individual pollutant removal experiment, the removal of phosphate by ZVI was limited to 80% after 300 min. Its removal rate was considerably improved in the presence of hydrogen peroxide and the complete removal of phosphate was achieved after 15 min.

摘要

零价铁(ZVI)废水处理已应用于半导体酸性废水中硝酸盐、过氧化氢和磷酸盐的同步去除。在酸性条件下,由于ZVI的连续转化而发生的反应实现了同步去除。幸运的是,半导体酸性废水的溶液pH值较低,这对ZVI的连续转化是有效的。首先,在酸性条件下,ZVI腐蚀产生的电子使硝酸盐发生还原反应。其次,ZVI腐蚀产生的亚铁离子与过氧化氢反应生成·OH自由基(芬顿反应)。芬顿反应包括过氧化氢的降解和铁离子的生成。最后,磷酸盐与铁离子沉淀出来。在同步去除过程中,1.6 mM硝酸盐、9.0 mM过氧化氢和1.0 mM磷酸盐分别在100、15和15分钟内被ZVI完全去除。发现了去除硝酸盐、过氧化氢和磷酸盐的反应之间的协同作用。在单独的污染物去除实验中,ZVI对磷酸盐的去除在300分钟后限制在80%。在过氧化氢存在下,其去除率显著提高,15分钟后实现了磷酸盐的完全去除。

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