Removal of ammonium-nitrogen from groundwater using a fully passive permeable reactive barrier with oxygen-releasing compound and clinoptilolite.
Removal of ammonium-nitrogen from groundwater using a fully passive permeable reactive barrier with oxygen-releasing compound and clinoptilolite.
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DOI：
10.1016/j.jenvman.2015.02.012
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发表时间：
2015-05
影响因子：
8.7
通讯作者：
Guoxin Huang;Fei Liu;Yingzhao Yang;Wei Deng;Shengpin Li;Yuanying Huang;Xiangke Kong
中科院分区：
文献类型：
--
作者：
Guoxin Huang;Fei Liu;Yingzhao Yang;Wei Deng;Shengpin Li;Yuanying Huang;Xiangke Kong
提出了一种以释氧化合物（ORC）和斜发沸石为填料的全被动渗透反应墙（PRB）去除地下水中氨氮的新工艺。PRB涉及氧释放、生物硝化、离子交换和生物再生的组合。中试规模的性能比较实验进行了采用三个平行的列，以评估拟议的PRB。结果表明，PRB对NH 4+-N几乎完全去除（> 99%）. NH 4+-N去除率为5.23- 10.88mg/L，NO2--N <1.93mg/L，NO3--N为2.03- 19.67mg/L。离子交换和生物硝化均对NH 4+-N的去除有贡献，在供氧充足的条件下，后者起主导作用。生物硝化有利于延迟吸附饱和和释放交换网站。ORC可以充分、有效地为大约120个孔体积提供氧气。在生物活性暂时不足的情况下，斜发沸石对NH 4+-N的去除效果较好.没有外部的碱度来源，必须提供和有氧代谢没有抑制发生。陶粒对生物量增长的影响可以忽略不计。根据研究结果，2012年在中国沈阳安装了全尺寸连续墙PRB。
A novel fully passive permeable reactive barrier (PRB) with oxygen-releasing compound (ORC) and clinoptilolite was proposed for the removal of ammonium-nitrogen from groundwater. The PRB involves a combination of oxygen release, biological nitrification, ion exchange, and bioregeneration. A pilot-scale performance comparison experiment was carried out employing three parallel columns to assess the proposed PRB. The results showed that the PRB achieved nearly complete NH 4+-N depletion (> 99%). NH 4+-N of 5.23–10.88 mg/L was removed, and NO 2−-N of< 1.93 mg/L and NO 3−-N of 2.03–19.67 mg/L were generated. Ion exchange and biological nitrification both contributed to NH 4+-N removal, and the latter played a dominant role under the condition of sufficient oxygen. Biological nitrification favored a delay in sorption saturation and a release of exchange sites. The ORC could sufficiently, efficiently supply oxygen for approximately 120 pore volumes. The clinoptilolite ensured a robust NH 4+-N removal in case of temporary insufficient biological activities. No external alkalinity sources had to be supplied and no inhibition of aerobic metabolism occurred. The ceramicite had a negligible effect on the biomass growth. Based on the research findings, a full-scale continuous wall PRB was installed in Shenyang, China in 2012.