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首页> 外文期刊>African Journal of Biotechnology >Electrochemical removal of nitrite in simulated aquaculture wastewater
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Electrochemical removal of nitrite in simulated aquaculture wastewater

机译：电化学去除模拟水产养殖废水中的亚硝酸盐

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摘要

Electrochemical removal of nitrite at a concentration of 10 mg l-1?from synthetic aquaculture wastewater was investigated in this?study?using a batch reactor. The effects of important operating parameters such as electrode material and applied current density?were?studied. The highest nitrite removal is achieved with nickel as compared to stainless steel and other electrode materials.?Optimum nitrite removal is achieved at a current density of 3.75 mA cm-2?and an initial pH of 5. Basic pH tends to inhibit nitrite oxidation, which is consistent with the literature. An optimum anode to cathode surface area ratio of 1 and an inter-electrode spacing of 2 cm gave best results, respectively.?Nitrite concentrations are reduced to match USEPA’s discharge limit of 1 mg l-1?within 5 min of experimental runs.?This is much better than previously reported results. Nitrate concentrations generated remained within USEPA’s discharge limit of 10 mg l-1.?Further experiments are recommended for?theconversion of nitrate to nitrogen.?Using operating parameters determined here, it?wasenvisaged that real aquaculture wastewater can also be treated efficiently for the removal of nitrite in both batch and continuous scales of operation.
机译：在这项研究中，使用间歇式反应器研究了从合成水产养殖废水中电化学去除亚硝酸盐浓度为10 mg l-1？的情况。研究了重要操作参数如电极材料和施加的电流密度的影响。与不锈钢和其他电极材料相比，镍可实现最高的亚硝酸盐去除。在电流密度为3.75 mA cm-2且初始pH值为5时，亚硝酸盐的去除达到最佳。碱性pH倾向于抑制亚硝酸盐的氧化，这与文献一致。最佳的阳极与阴极表面积之比为1且电极间间距为2 cm分别提供了最佳结果。亚硝酸盐浓度在实验运行的5分钟内降低到与USEPA 1 mg l-1？的排放极限相匹配。这比以前报告的结果要好得多。产生的硝酸盐浓度仍保持在USEPA排放限值10 mg l-1之内。建议进一步进行实验，以将硝酸盐转化为氮。使用此处确定的操作参数，可以认为也可以有效处理水产养殖废水以进行去除分批和连续操作规模的亚硝酸盐。

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