School of Chemistry and Biochemistry, University of Western Australia, Crawley, Australia; CSIRO Land and Water Flagship, Private Bag 5, Wembley, 6913, WA, Australia; Department of Plant Protection, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia.
School of Chemistry and Biochemistry, University of Western Australia, Crawley, Australia; CSIRO Land and Water Flagship, Private Bag 5, Wembley, 6913, WA, Australia.
Water Res. 2015 Mar 1;70:184-95. doi: 10.1016/j.watres.2014.11.040. Epub 2014 Dec 4.
The fate of benzotriazole (BTri) and 5-methylbenzotriazole (5-MeBT) was investigated under anaerobic conditions at nano gram per litre concentrations in large-scale laboratory columns to mimic a managed aquifer recharge replenishment strategy in Western Australia. Investigations of BTri and 5-MeBT sorption behaviour demonstrated mobility of the compounds with retardation coefficients of 2.0 and 2.2, respectively. Degradation processes over a period of 220 days indicated first order biodegradation of the BTri and 5-MeBT under anaerobic aquifer conditions after a biological lag-time of approximately 30-60 days. Biodegradation half-lives of 29 ± 2 and 26 ± 1 days for BTri and 5-MeBT were respectively observed, with no threshold effect to biodegradation observed at the 200 ng L(-1). The detection of degradation products provided further evidence of BTri and 5-MeBT biodegradation. These results suggested that if BTri and 5-MeBT were present in recycled water recharged to the Leederville aquifer, biodegradation during aquifer passage is likely given sufficient aquifer residence times or travel distances between recycled water injection and groundwater extraction.
在大型实验室柱中，以纳克/升浓度模拟西澳大利亚管理的含水层补给补充策略，研究了苯并三唑（BTri）和 5-甲基苯并三唑（5-MeBT）在厌氧条件下的命运。BTri 和 5-MeBT 吸附行为的研究表明，这些化合物具有移动性，其迟滞系数分别为 2.0 和 2.2。在 220 天的时间内，降解过程表明，BTri 和 5-MeBT 在厌氧含水层条件下具有一级生物降解，在大约 30-60 天的生物滞后期后。BTri 和 5-MeBT 的生物降解半衰期分别为 29 ± 2 和 26 ± 1 天，在 200ng/L 时未观察到生物降解的阈值效应。降解产物的检测进一步证明了 BTri 和 5-MeBT 的生物降解。这些结果表明，如果 BTri 和 5-MeBT 存在于回收到利德维尔含水层的再生水中，那么在含水层通过期间进行生物降解是可能的，前提是含水层停留时间或再生水注入和地下水抽取之间的旅行距离足够长。
