[WATER] Management and Control of Taste and Odour Problems associated with Geosmin and 2-MIB in Drinking Water Supplies

在这个案例奖学金博士项目中，我们的目标是了解威塞克斯集水区饮用水水库中VOC产量升高的驱动因素（Geosmin和2-MIB）。Geosmin和2-MIB的偶发性爆发偶尔（尽管并非总是）与韦塞克斯水库浮游蓝藻菌的大量繁殖有关，但最近，底栖生物群落已被确定为挥发性有机化合物的潜在和重要来源（韦塞克斯水，未发表的数据）。我们将以三个水库及其相关的集水区为重点，分析这些挥发性有机化合物的分布、运输和命运，以及它们对水处理过程的反应。具体目标是：i)从三个水塘的底栖和上层区域（以及邻近的集水区）分离可能产生挥发性有机化合物的微生物；ii)在一系列实验制度下检查土臭素和2-MIB产生的种内和种间变异；iii)确定挥发性有机化合物的溶解部分和颗粒部分的区隔程度；iv)确定导致挥发性有机化合物渗出的条件，特别关注病毒裂解、原生动物和甲壳类食草动物的作用，使用分离的底栖和远洋产生挥发性有机化合物的微生物。

In this CASE Studentship PhD project we aim to understand the drivers of elevated VOC production (Geosmin and 2-MIB) in drinking water reservoirs within the Wessex Water catchment. Episodic outbreaks of Geosmin and 2-MIB have occasionally, though not always, been associated with planktonic cyanobacterial blooms in Wessex reservoirs, but more recently, benthic communities have been identified as potential and significant sources of the VOCs, (Wessex Water, unpublished data). Focussing on three reservoirs and their associated catchments, we will analyse the distribution, transport and fate of these VOCs and their response to water treatment processes. The specific aims are: i) to isolate potential VOC producing microorganisms from the benthic and pelagic regions of the three reservoirs (and from the immediate catchment); ii) to examine intra-and interspecific variability in Geosmin and 2-MIB production under a range of experimental regimes; iii) to determine the degree of compartmentalisation between dissolved and particulate fractions of VOCs; iv) identify conditions that lead to the exudation of VOCs with a specific focus on the role(s) of viral lysis, protozoan and crustacean grazers, using isolated benthic and pelagic VOC-producing microorganisms.