Development of advanced reduction process (ARP) of nitrate / nitrite by electrolysis with metallic iron

开发金属铁电解硝酸盐/亚硝酸盐的高级还原工艺（ARP）

• 批准号: 12480161
• 负责人: FUJIE Koichi
• 金额: $ 6.4万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12480161/
• 关键词: Inorganic wastewater; Metallic iron; Nitrate; Nitrite; Platinum electrode; Iron electrode; Nitrate reduction rate; Transformation ratio; Advanced reduction process; 硝酸・亜硝酸; 転換率

Nitrate is a common pollutant in closed surface water systems and ground water, and it usually cause serious eutrophication problem in surface water systems and health threats to human. Current technologies to remove nitrate from water include biological denitrification, separation with ion exchange or reverse osmosis and reduction by chemical reductants. In recent years, the chemical reduction of nitrate has received a lot of attention. It is considered that chemical reduction processes of nitrate can achieve a higher removal rate of nitrate than biological denitrification processes. Furthermore, chemical reduction processes have a relatively higher selectivity for nitrate than the separating methods. The purpose of this study was to develop an electrolytic method to remove nitrate from water as nitrogen gas by electrolysis.In this study, metallic iron was used as a reductant for nitrate removal from water. The effect of pH on the reduction rate and products of nitrate under acidic an … More d aerobic conditions was experimentally studied. Our study clearly showed that nitrate in water can be completely reduced by metallic iron under acidic and aerobic conditions. Selecting an optimal pH value may control the reduction rate and products of nitrate.The effect of the co-existences of ferrous and chloride ions on electrolytic reduction of nitrate using platinum plate as the electrodes was investigated. The experimental results showed that the electrolytic reduction of nitrate was remarkably enhanced by the addition of ferrous ion in the reaction solution. Nitrate can be completely transformed to nitrogen gas with the additions of ferrous and chloride ions in reaction solution.In addition, effect of copper and iron ions on nitrate reduction with electrochemical method was investigated. Copper ion and ferrous ion can promote nitrate reduction. Copper ion is much more effective to nitrate reduction than ferrous ion. Initial copper ion concentration and current density have great influence on nitrate reduction. Less

硝酸盐是封闭地表水系统和地下水中常见的污染物，常引起地表水系统严重的富营养化问题，威胁人类健康。目前去除水中硝酸盐的技术包括生物脱氮、离子交换或反渗透分离和化学还原剂还原。近年来，硝酸盐的化学还原受到了广泛的关注。认为化学还原法对硝酸盐的去除率高于生物反硝化法。此外，化学还原法对硝酸盐的选择性比分离法高。本研究以金属铁为还原剂，以氮气为电解气体，以电解法去除水中硝酸盐。研究了pH值对酸性条件下硝酸盐还原速率及产物的影响， ...更多信息 d好氧条件进行了试验研究。我们的研究清楚地表明，在酸性和有氧条件下，水中的硝酸盐可以被金属铁完全还原。选择合适的pH值可以控制硝酸盐的还原速率和产物，以铂片为电极，研究了亚铁离子和氯离子共存对硝酸盐电解还原的影响。实验结果表明，亚铁离子的加入对硝酸盐的电解还原有明显的促进作用。在反应液中加入亚铁离子和氯离子可以使硝酸盐完全转化为氮气，并采用电化学方法研究了铜离子和铁离子对硝酸盐还原的影响。铜离子和亚铁离子对硝酸盐还原有促进作用。铜离子对硝酸盐的还原作用比亚铁离子强得多。初始铜离子浓度和电流密度对硝酸盐还原影响较大。少

项目成果

Hong-Ying Hu: "Effect of pH on the reduction of nitrite in water by metalic iron"Water Research. (in press).

胡红英：“pH值对金属铁还原水中亚硝酸盐的影响”水研究。

Dongbin Wei, Hong-Ying Hu, Kosei Hiramoto, Koichi Fujie: "Quantitative prediction of electrochemical reduction characteristics for chlorinated aromatics based on their molecular structures"Chemistry Letters. 2002(4). 456-457 (2002)

魏东斌、胡红英、平本浩生、藤杰浩一：“基于氯化芳烃分子结构的电化学还原特性的定量预测”化学快报。

Dongbin Wei, Hong-Ying Hu, Kosei Hiramoto and Koichi Fujie: "Quantitative prediction of electrochemical reduction characteristics for chlorinated aromatics based on their molecular structures"Chemistry Letters. 2002(4). 456-457 (2002)

Dongbin Wei、Hong-Ying Hu、Kosei Hiramoto 和 Koichi Fujie：“基于氯化芳烃分子结构的电化学还原特性的定量预测”化学快报。

Hong-Ying Hu, Naohiro Goto, Koichi Fujie: "Effect of pH on the reduction of nitrate in water by metallic iron"Water Research. 35(11). 2789-2793 (2001)

Hong-Ying Hu、Naohiro Goto、Koichi Fujie：“pH 对金属铁还原水中硝酸盐的影响”水研究。

奥田直史, 胡 洪営, 林 炳蘭, 後藤尚弘, 藤江幸一: "硝酸性窒素の電解処理における操作条件の検討"化学工学学会第34回秋季大会研究発表講演要旨集. O107 (2001)

Naofumi Okuda、Hongying Hu、Binglan Hayashi、Naohiro Goto、Koichi Fujie：“硝态氮电解处理操作条件的研究”第 34 届化学工程师学会秋季会议 O107 研究报告摘要集（2001 年）。