https://hdl.handle.net/10680/1323 2022-12-23T12：05：24Z https://hdl.handle.net/10680/1326 在加拿大曼尼托巴省大马拉斯的建造湿地的性能：从市政废水安德森（Julie C。卡尔森，朱尔斯c。Low，Jennifer E。;Challis，Jonathan K。；黄，查尔斯纳普，查尔斯·W。Hanson，Mark L.背景：从处理的市政废水中将营养物质，有机微量污染物和抗生素耐药性基因的复杂混合物排放到淡水系统中，这是人类健康和水生生物的全球关注点。抗生素耐药性基因（ARGS）是具有对抗生素抗药性并降低抗生素抗性能力的能力的基因。在加拿大曼尼托巴省的大马莱亚愽娱乐app的农村社区中，废水在通过治疗湿地并随后释放到地表水中之前，在污水泻湖中被动处理。将此设施用作加拿大大草原的模型系统，这项研究的两个目的是评估：（a）养分，微污染物（即农药，药品）和泻湖产量中的存在，以及（b）它们的存在 potential removal by the treatment wetland prior to release to surface waters in 2012. RESULTS: As expected, concentrations of nitrogen and phosphorus species were greatest in the lagoon and declined with movement through the wetland treatment system. Pharmaceutical and agricultural chemicals were detected at concentrations in the ng/L range. Concentrations of these compounds spiked downstream of the lagoon following discharge and attenuation was observed as the effluent migrated through the wetland system. Hazard quotients calculated for micropollutants of interest indicated minimal toxicological risk to aquatic biota, and results suggest that the wetland attenuated atrazine and carbamazepine significantly. There was no significant targeted removal of ARGs in the wetland and our data suggest that the bacterial population in this system may have genes imparting antibiotic resistance. CONCLUSIONS: The results of this study indicate that while the treatment wetland may effectively attenuate excess nutrients and remove some micropollutants and bacteria, it does not specifically target ARGs for removal. Additional studies would be beneficial to determine whether upgrades to extend retention time or alter plant community structure within the wetland would optimize removal of micropollutants and ARGs to fully characterize the utility of these systems on the Canadian Prairies. 2013-01-01T00：00：00z https://hdl.handle.net/10680/1325 多种细菌菌株具有不同的诱导化合物Andrew C.。黄，查尔斯Crowley，David E.通过研究表明，PCB对映体在环境样品中的发生差异（包括河流和河岸生物群和沉积物）中，已经提出了多氯联苯（PCB）的对映选择性生物转化。然而，迄今为止，文献中只有一项研究通过PCB降解的微生物检查了对映选择性。 2002-11-01T00：00：00z https://hdl.handle.net/10680/1324 在沉积物 - 水界面stolzenbach，Keith d。的细颗粒聚集。纽曼，凯瑟琳A。Wong，Charles S.通过机械搅拌或常驻有机体（Tubificid寡聚体）搅拌的底部沉积物层的存在显着提高了从实验室柱中的悬浮液中除去罚款（1 µm）内粘性颗粒的速率。测得的颗粒去除速率等效于从每天0.23 m到每天0.41 m的沉积速度。这些速率是通过在实验对照中观察到的水柱中的重力沉降或与较大颗粒的重力沉降或与较大的颗粒凝结快的数量级。假设增加的去除率是在床 - 水界面处沉积物层聚集的结果，其特征是松散结合（蓬松的）多孔材料流体动力学与水柱耦合。根据这种假设的去除，就会发生颗粒或有机体活动的运动导致悬浮的细颗粒与碰撞并粘在界面沉积物上时。这一新假设得到了在沿海地区和界面聚集率的理论估计中回收的芯和沉积物陷阱中回收的示踪剂颗粒的质量和尺寸分布。 1992-11-15T00：00：00z