Treatment of ammonia in pilot-scale constructed wetland systems with clinoptilolite
Treatment of ammonia in pilot-scale constructed wetland systems with clinoptilolite
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用斜发沸石处理中试规模的人工湿地系统中的氨
DOI：
10.1016/j.jece.2013.08.034
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
J. Rodgers
中科院分区：
文献类型：
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作者：
D. A. Beebe;J. W. Castle;J. Rodgers
基于斜发沸石对氨的亲和力和附着附生生物膜的高表面积，研究了斜发沸石作为用于人工湿地处理系统（CWTS）的吸附介质。批量吸附实验的结果表明，所研究的斜发沸石对氨具有亲和力，如 Freundlich 方程 q= 0.72 C e 0. 57 所示，平衡氨氮浓度为 0.07 至 30.1 mg/L。在 10 天的采样期内，种植有加州鲽鱼并含有 1000 g 斜发沸石的中试规模 CWTS 比不含斜发沸石的对照系统（平均流出量 8.6 mg/L，标准差 = 2.7）。使用硝化细菌活性反应测试 (n-BART) 在来自处理过的 CWTS 的斜发沸石样品中检测硝化作用。在种植大叶香蒲的中试规模的 CWTS 中添加斜发沸石不会影响氨去除，并且在斜发沸石样品中未检测到硝化活性。这些数据表明，当提供支持硝化作用（包括水土氧化还原）所需的条件时，斜发沸石可以增加接受氨浓度等于或大于〜6-10 mg/L的CWTS中的氨去除和硝化活性。
Clinoptilolite was investigated as a sorptive medium for use in constructed wetland treatment systems (CWTSs) based on its affinity for ammonia and high surface area for attachment of periphytic biofilms. Results from a batch sorption experiment indicate that the clinoptilolite studied has an affinity for ammonia described by the Freundlich equation q= 0.72 C e 0. 57 for equilibrium ammonia-N concentrations from 0.07 to 30.1 mg/L. During a 10-day sampling period, a pilot-scale CWTS planted with Schoenoplectus californicus and containing 1000 g clinoptilolite removed significantly more (p-value= 8.8× 10− 3) ammonia-N (mean outflow 4.5 mg/L, standard deviation= 4.1) than a control system containing no clinoptilolite (mean outflow 8.6 mg/L, standard deviation= 2.7). Nitrification was detected in samples of clinoptilolite from the treated CWTS using nitrifying bacteria activity reaction tests (n-BARTs). Ammonia removal was not affected by addition of clinoptilolite to a pilot-scale CWTS planted with Typha latifolia, and nitrification activity was not detected in samples of clinoptilolite. These data illustrate that clinoptilolite can increase ammonia removal and nitrifying activity in CWTSs receiving ammonia concentrations equal to or greater than∼ 6–10 mg/L when conditions required to support nitrification including hydrosoil redox are provided.