Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7482348 | Journal of Environmental Management | 2015 | 7 Pages |
Abstract
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 NH4+-N depletion (>99%). NH4+-N of 5.23-10.88Â mg/L was removed, and NO2â-N of <1.93Â mg/L and NO3â-N of 2.03-19.67Â mg/L were generated. Ion exchange and biological nitrification both contributed to NH4+-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 NH4+-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.
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Authors
Guoxin Huang, Fei Liu, Yingzhao Yang, Wei Deng, Shengpin Li, Yuanying Huang, Xiangke Kong,