Enhanced bioremediation of nutrient contaminated groundwater

营养物污染地下水的强化生物修复

基本信息

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

项目摘要

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.

在曼尼托巴省，大约25％的浅层农村水井含有硝酸盐，超过了饮用水标准（Frost 2006）。可以解决营养污染的土壤和地下水的补救技术对于农村地区的健康饮用水至关重要。一种这样的技术，即增强的生物修复，包括添加碳源，电子受体和/或宏观或微营养素，以促进天然微生物种群的硝酸盐降解（ITRC 2000）。增强生物修复的好处包括促进自然微生物种群，土地有限的干扰以及可持续的绿色解决方案。曼尼托巴大学和AMEC Foster Wheeler之间的这项研究合作将乙醇视为提高硝酸盐反硝化能力的碳源。乙醇表现出对较冷气候中高反硝化率的有望，土壤柱在几周内降低了95％（Martin等，2009； Edwards等，2007）。作为这项研究的一部分，将使用养分污染的肥料存储设施中的土壤和地下水来创建缩影以评估寒冷气候条件下的硝酸盐去除率。将在不同治疗方法之间评估微生物种群，以确定注射乙醇对微生物生长/代谢的影响。实验室土壤柱测试将检查乙醇的运动以了解和预测含水层的运动。这些结果将构成该站点的数值流模型的基础，以未来实施现场尺度的修复治疗计划。这项研究对于了解对乙醇添加的微生物和含水层材料的反应至关重要，并有助于开发硝酸盐修复的成本效益和及时解决方案。