Ozonation products of carbamazepine and their removal from secondary effluents by soil aquifer treatment - Indications from column experiments
Ozonation products of carbamazepine and their removal from secondary effluents by soil aquifer treatment - Indications from column experiments
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DOI：
10.1016/j.watres.2013.11.016
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发表时间：
2014-02-01
期刊：
影响因子：
12.8
通讯作者：
Jekel, M.
中科院分区：
文献类型：
--
作者：
Huebner, U.;Seiwert, B.;Jekel, M.
臭氧化被认为是一种有效的处理方法，可以降低污水处理厂流出物中许多痕量有机化合物的浓度，但必须考虑未知的和可能持久的有毒转化产物的形成。本文研究了臭氧与土壤含水层处理相结合的废水三级处理方法对抗癫痫药物卡马西平（CBZ，10 μ g/L）及其转化产物的去除效果。批式试验和中试实验证实了臭氧对二级出水中卡马西平的有效去除。典型的臭氧消耗量为0.7 mg O-3/mg DOC 0，约转化产物中约50%为1-（2-苯甲醛）-4-氢-（1H，3 H）-喹唑啉-2-酮（BQM）。对CBZ的13种臭氧化产物的结构和生成途径进行了初步探讨。在随后的生物处理BQM被证明是更有效的生物降解比CBZ。其醛基迅速氧化成羧酸（BaQM），在砂柱实验中将其除去。在砂柱实验中，CBZ的大部分次要臭氧化产物持续存在，停留时间为5-6天。柱流出物的非目标筛选显示没有形成持久性生物转化产物。(C)2013爱思唯尔有限公司保留所有权利。
Ozonation is known as an efficient treatment to reduce the concentration of many trace organic compounds from WWTP effluents, but the formation of unknown and possibly persistent and toxic transformation products has to be considered. In this paper tertiary treatment of wastewater by the combination of ozone and soil aquifer treatment was investigated with respect to the removal of the antiepileptic drug carbamazepine (CBZ, 10 mu g/L) and its transformation products. Batch tests and pilot experiments confirmed efficient removal of carbamazepine from secondary effluent by ozone. With typical ozone consumption of 0.7 mg O-3/mg DOC0, approx. 50% of the transformed CBZ was detected as its primary product 1-(2-benzaldehyde)-4-hydro-(1H,3H)-quinazoline-2-one (BQM). Structure proposals and a formation pathway were elaborated for a total of 13 ozonation products of CBZ. In subsequent biological treatment BQM turned out to be more effectively biodegraded than CBZ. Its aldehyde group was quickly oxidized to a carboxylic acid (BaQM which was removed in sand column experiments. Most of the minor ozonation products of CBZ persisted in sand column experiments with residence times of 5-6 days. Non-target screening of column effluent revealed no formation of persistent biotransformation products. (C) 2013 Elsevier Ltd. All rights reserved.