Enhanced bioremediation of nutrient contaminated groundwater

营养物污染地下水的强化生物修复

• 批准号: 492827-2016
• 负责人: SriRanjan, Ramanathan
• 金额: $ 1.82万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=602212
• 关键词: Enhanced; bioremediation; nutrient; contaminated; groundwater

In Manitoba approximately 25% of shallow rural domestic water wells contained nitrate exceeding the drinking water standards (Frost 2006). Remediation techniques that can address nutrient contaminated soil and groundwater beneath bulk fertilizer and nutrient storage facilities are crucial for healthy drinking water in rural areas. One such technique, enhanced bioremediation, includes the addition of a carbon source, electron acceptors, and/or macro or micro nutrients to promote nitrate degradation by native microbial populations (ITRC 2000). The benefit of enhanced bioremediation includes the promotion of the natural microbial population, limited disturbance of the land, and a sustainable green solution to remediation. This research collaboration between the University of Manitoba and Amec Foster Wheeler examines ethanol as a carbon source for improving nitrate denitrification capacity. Ethanol has shown promise for high denitrification rates in colder climates, with soil columns showing 95% reduction within weeks (Martin et al. 2009; Edwards et al. 2007). As part of this research, soil and groundwater from a nutrient contaminated fertilizer storage facility will be used to create microcosms to evaluate the nitrate removal rates under cold climate conditions. Microbial populations will be evaluated between the different treatments to determine the effect of the ethanol injections on microbial growth/metabolism. A laboratory soil column test will examine the movement of ethanol to understand and predict the movement through the aquifer. These results will form the basis for a numerical flow model of the site for the future implementation of a field-scale remediation treatment plan. This research is critical to understand the microbial and aquifer material response to ethanol addition and help develop cost effective and timely solution for nitrate remediation.

在马尼托巴省，大约 25% 的农村生活浅水井的硝酸盐含量超过了饮用水标准（Frost 2006）。可以解决散装肥料和养分储存设施下方养分污染的土壤和地下水的修复技术对于农村地区的健康饮用水至关重要。其中一种技术是增强生物修复，包括添加碳源、电子受体和/或大量或微量营养素，以促进天然微生物种群对硝酸盐的降解（ITRC 2000）。加强生物修复的好处包括促进自然微生物种群、减少对土地的干扰以及可持续的绿色修复解决方案。马尼托巴大学和 Amec Foster Wheeler 之间的这项研究合作研究了乙醇作为提高硝酸盐反硝化能力的碳源。乙醇在寒冷气候下有望实现高反硝化率，数周内土壤柱减少 95%（Martin 等人，2009 年；Edwards 等人，2007 年）。作为这项研究的一部分，来自营养物污染的肥料储存设施的土壤和地下水将用于创建微观世界，以评估寒冷气候条件下的硝酸盐去除率。将评估不同处理之间的微生物种群，以确定乙醇注射对微生物生长/代谢的影响。实验室土柱测试将检查乙醇的运动，以了解和预测通过含水层的运动。这些结果将构成该场地数值流量模型的基础，以便将来实施现场规模的修复处理计划。这项研究对于了解微生物和含水层材料对乙醇添加的反应至关重要，并有助于开发具有成本效益且及时的硝酸盐修复解决方案。