Abstract Degradation of triclosan and triclocarban and formation of transformation products in activated sludge using benchtop bioreactors
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental research >Degradation of triclosan and triclocarban and formation of transformation products in activated sludge using benchtop bioreactors
【24h】

Degradation of triclosan and triclocarban and formation of transformation products in activated sludge using benchtop bioreactors

机译：使用台式生物反应器降解活性污泥中的三氯生和三氯卡班并形成转化产物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

AbstractBenchtop bioreactors were run aerobically with activated sludge samples collected from a large municipal wastewater treatment plant (WWTP) to understand how increased hydraulic retention time (HRT), sludge retention time (SRT), and varying treatment temperatures (21°C and 30°C) impact concentrations of the endocrine disrupting antimicrobials triclosan (TCS), triclocarban (TCC), and their transformation products. Samples from the reactors were collected periodically over a 122–196h period and the solid and liquid fraction were separately quantitated for TCS, TCC, and methyltriclosan (MeTCS) and scanned qualitatively for six other transformation products. Results indicated that TCS, TCC and MeTCS were predominately associated with the solids fraction of the activated sludge with only nominal concentrations in the liquids fraction. TCS was degraded in the solids fraction, with increased rates at 30°C (−0.0224 ± 0.007h−1) when compared to reactors run at 21°C (− 0.0170 ± 0.003h−1). Conversely, TCC concentrations did not significantly change in solids samples from reactors run at 21°C, while an increase in reactor temperature to 30°C resulted in TCC degradation at an average rate of − 0.0158 ± 0.012h−1. Additionally, MeTCS formation in the solids fraction was observed in three out of four reactors run - indicating a notable transformation of TCS. Qualitative appearance of 2,4-dichlorophenol and 4-chloroanaline was observed in the liquids fraction of all reactor samples. The remaining four qualitatively scanned compounds were not detected. These experiments demonstrate that increased HRT, SRT, and temperature result in enhanced removal of TCS and TCC from wastewater during the activated sludge process. Furthermore, a substantial formation of TCS into MeTCS was observed.Highlights•Benchtop bioreactors were run with activated sludge for 122 – 196h.•Extended HRT and SRT and increased temperatures on TCS, TCC, and their byproducts were studied.•Prolonged HRT and SRT resulted in more efficient TCS and TCC removal.•Increases in reactor temperature improved TCS and TCC degradation.•Significant MeTCS formation was observed.
机译： 摘要 对台式生物反应器进行有氧操作，该反应器是从大型市政废水处理厂（WWTP）收集的活性污泥样品中进行操作的，以了解如何增加水力停留时间（HRT），污泥停留时间（ SRT）和变化的处理温度（21°C和30°C）会影响破坏内分泌的抗微生物剂三氯生（TCS），三氯卡班（TCC）及其转化产物的浓度。在122-196h的时间内定期收集反应堆的样品，并分别定量分析固相和液相部分的TCS，TCC和甲基三氯甲烷（MeTCS），并定性扫描其他六种转化产物。结果表明，TCS，TCC和MeTCS主要与活性污泥的固体部分相关，而液体部分中仅标称浓度。与在21°C下运行的反应器相比，TCS在30°C下的降解率有所提高（−0.0224±0.007h -1 ） − 0.0170±0.003h -1 ）。相反，在21°C下运行的反应器中，固体样品中的TCC浓度没有显着变化，而将反应器温度提高到30°C导致TCC的平均降解率为-0.0158±0.012h − 1 。另外，在运行的四个反应器中，有三个反应器中观察到了固体部分中的MeTCS形成-表明TCS发生了明显的转变。在所有反应器样品的液体部分中观察到2,4-二氯苯酚和4-氯苯胺的定性外观。未检测到其余四个定性扫描的化合物。这些实验表明，增加的HRT，SRT和温度会导致活性污泥过程中废水中TCS和TCC的去除率提高。此外，还观察到TCS大量形成了MeTCS。 突出显示 • 台式生物反应器与活性污泥一起运行122 – 196h。 • 研究了延长的HRT和SRT以及TCS，TCC及其副产物的温度升高。 • 延长的HRT和SRT可以更有效地去除TCS和TCC。< / ce：para> < ce：label>• 反应堆温度升高可改善TCS和TCC降解。 • 观察到明显的MeTCS形成。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号