Enhanced bioremediation of chlorate and chromium in groundwater

氯酸盐由化学工业大规模生产，用途广泛。**氯酸盐用于生产二氧化氯，用作纸浆和造纸工业的漂白剂，并用于饮用水消毒。目前，加拿大是世界上最大的氯酸钠生产国之一(Merchant Research&Consulting Ltd.，2017)。**氯酸盐和铬是纸浆和造纸厂以及氯酸钠制造厂地下水中常见的共同污染物。氯酸盐的一些修复方法可能对其他共同污染物(例如六价铬)无效，并可能导致其他金属(例如砷、钡)从天然土壤中被不良地动员。在设计和建造修复系统之前，重要的是量化这些金属可能释放到地下水和潜在的水环境中。**拟议的研究将评估由强化生物修复(例如，有机化合物与土壤混合)，然后是非生物转化(例如，石灰岩与土壤混合)组成的顺序处理系统是否为这些场地提供有效的补救方法，这些场地往往由于控制地下水污染的昂贵、低效的技术(例如抽水和处理)而得不到修复(例如棕地)。据申请者所知，这是第一次在这些类型的场地应用就地修复技术来处理这两种污染物，也是第一次针对寒冷地区的条件对这些修复方法进行评估，加拿大直接受益。该项目是马尼托巴大学(PiDr.Beata Gorczyca)、狄龙咨询公司和一个行业合作伙伴之间的合作。**

Chlorate is produced on a large scale by the chemical industry and used in a wide range of applications.**It is manufactured for the production of chlorine dioxide which is used as a bleaching agent in the pulp and paper industry, and in disinfection of drinking water. Currently, Canada is one of the largest sodium chlorate producers in the world (Merchant Research & Consulting Ltd., 2017).**Chlorate and chromium are common co-contaminants in groundwater at pulp and paper mills and sodium chlorate manufacturing facilities. Some remediation approaches for chlorate may not be effective for other co-contaminants (e.g. hexavalent chromium), and may result in the undesirable mobilization of other metals (e.g. arsenic, barium) from native soils. It is important to quantify the possible release of these metals into the groundwater, and potentially the aquatic environment, prior to design and construction of a remediation system.**The proposed research will evaluate whether sequential treatment systems consisting of enhanced bioremediation (e.g. organic compound mixed with soil), followed by abiotic transformation, (e.g. limestone mixed with soil), provide an effective remedial approach for these sites, which often go unremediated (e.g. brownfields) due to costly, inefficient techniques to control groundwater contamination (e.g. pump and treat). To the applicants best knowledge, it is the first time in-situ remediation techniques have been applied to treat both contaminants at these types of sites, and the first time these remediation approaches have been evaluated for cold region conditions, benefiting Canada, directly. The project is collaboration between the University of Manitoba (PI Dr.Beata Gorczyca), Dillon Consulting, and an industry partner.**