引用本文:董磊,林莉,李青云,吴敏,郦超,等.改性凹凸棒土/纳米铁复合材料与微生物耦合去除地下水硝酸盐氮的研究[J].环境科学研究,2017,30(7):1112-1119.
DONG Lei,LIN Li,LI Qingyun,WU Min,LI Chao,et al.Removal of Nitrate from Groundwater by Coupling System Composed with Modified Attapulgite/Fe Nano Composites and Microorganisms[J].Reserrch of Environmental Science,2017,30(7):1112-1119.]
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改性凹凸棒土/纳米铁复合材料与微生物耦合去除地下水硝酸盐氮的研究
董 磊1,2, 林 莉1,2, 李青云1,2, 吴 敏1,2, 郦 超1,2
1.长江水利委员会长江科学院流域水环境研究所, 湖北 武汉 430010 ;2.长江水利委员会长江科学院, 流域水资源与生态环境科学湖北省重点实验室, 湖北 武汉 430010
摘要:
地下水是我国重要的饮用水源之一,国内部分地区地下水NO3--N含量超标,对人体健康造成潜在威胁. 采用模拟装置考察改性凹凸棒土/纳米铁复合材料、反硝化细菌及其耦合体系对地下水NO3--N去除效果及脱氮产物的变化特征. 结果表明,在模拟地下水溶解氧〔ρ(DO)为0.3 mg/L〕、温度(15 ℃)和黑暗环境下,50 mg改性凹凸棒土/纳米铁复合材料与50 mg/L NO3--N反应,7 d后NO3--N去除率为43.7%,其中63.6%的还原产物转化为NH4+-N,几乎无NO2--N生成,TN去除率为15.9%;反硝化细菌体系中,7 d后NO3--N去除率仅为9.7%,其中NO2--N占4.1%,几乎无NH4+-N生成,TN去除率为5.3%;在改性凹凸棒土/纳米铁复合材料-反硝化细菌耦合体系中,7 d后NO3--N去除率为80.6%,其中NH4+-N占33.2%、NO2--N占12.1%,TN去除率为35.2%. 研究显示,模拟地下水环境下,改性凹凸棒土/纳米铁复合材料-反硝化细菌耦合体系对NO3--N去除效果最好,TN去除率高.
关键词:  地下水  硝酸盐氮  改性凹凸棒土/纳米铁复合材料  微生物
DOI:
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基金项目:国家自然科学基金项目(41302204);中央级公益性科研院所基本科研业务费(CKSF2016025/SH);水利技术示范类项目(SF-201602)
Removal of Nitrate from Groundwater by Coupling System Composed with Modified Attapulgite/Fe Nano Composites and Microorganisms
DONG Lei1,2, LIN Li1,2, LI Qingyun1,2, WU Min1,2, LI Chao1,2
1.Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Changjiang Water Resources Commission, Wuhan 430010, China ;2.Key Laboratory of Basin Water Resource and Eco-Environmental Science in Hubei Province, Changjiang River Scientific Research Institute, Changjiang Water Resources Commission, Wuhan 430010, China
Abstract:
Abstract: Groundwater is an important source of drinking water in China. However, nitrate levels are above the limits in some areas, posing a serious threat to human health. NO3--N removal efficiency and characteristics of reaction products in groundwater by modified attapulgite/Fe nano composites, denitrifying bacteria and its coupling system were studied using simulation experiments. The results showed that the NO3--N removal ratio of modified attapulgite/Fe nano composites was 43.7% after 7 d (experimental conditions:15 °C, DO 0.3 mg/L, dark). 63.6% of the product was NH4+-N, while few NO2--N was generated; 15.9% TN was removed. As for denitrifying bacteria system, the removal rate of NO3--N was only 9.7% after 7 days, and the product of NO2--N was 4.1% with almost no NH4+-N generated; only 5.3% TN was removed. NO3--N removal efficiency was 80.6% after 7 days in the coupling system, and the product included 33.2% NH4+-N and 12.1% NO2--N; TN removal efficiency achieved 35.2%. Therefore, the coupling system was the best method with the highest TN removal efficiency for NO3--N among these three methods.
Key words:  groundwater  nitrate nitrogen  modified attapulgite/Fe nano composites  microorganism