CAREER: Engineered Humification Processes: An Innovative Approach to Remediate Hazardous Waste Sites

职业：工程腐殖化工艺：修复危险废物场地的创新方法

• 批准号: 9875241
• 负责人: Alok Bhandari
• 金额: $ 21万
• 依托单位: Kansas State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-04-01 至 2004-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9875241&HistoricalAwards=false
• 关键词: CAREER; Engineered; Humification; Processes; Innovative

The objective of this research is to evaluate the chemical and biochemical processes that result in the binding of select contaminants to soils and sediments. Such binding reactions can affect the fate and transport of pollutants by their in-situ humification with a significant impact on the chemicals' environmental mobility and ecotoxicity. Research will focus on studying the environmental fate of phenols and anilines in soils and sediments. Oxides of transition metals and enzymes can catalyze oxidative coupling reactions that polymerize select chemicals or bind them covalently to humic-acid type macromolecules. The proposed research will investigate the possibility of engineering similar humification processes in natural soils and sediments to permanently "trap" and detoxify phenols, anilines and hydroxylated polynuclear aromatic hydrocarbons. Ecotoxicology of the sequestered contaminants will be assessed by evaluating their leachability, bioavailablilty and toxicity. The overall results of this investigation will comprise the basis for a scientific understanding of the factors controlling enzyme and metal oxide mediated sequestration of aromatic acids and bases in soils and sediments, and provide information on the applicability of engineered humification processes to achieve health-risk based alternative remediation endpoints.

这项研究的目的是评估导致选定污染物与土壤和沉积物结合的化学和生化过程。这种结合反应可通过污染物的原位腐殖化作用影响污染物的去向和迁移，从而对化学品的环境流动性和生态毒性产生重大影响。研究的重点将是研究土壤和沉积物中酚和苯胺的环境命运。过渡金属和酶的氧化物可以催化氧化偶联反应，使选定的化学物质聚合或将它们共价结合到腐植酸型大分子上。这项拟议的研究将调查在天然土壤和沉积物中设计类似腐殖化过程的可能性，以永久地“捕获”酚、苯胺和羟基多核芳香烃并使其解毒。将通过评估其可浸出性、生物利用度和毒性来评估隔离污染物的生态毒理学。这项调查的总体结果将为科学理解控制酶和金属氧化物介导的土壤和沉积物中芳香酸和碱的固定的因素奠定基础，并提供关于工程腐殖化过程的适用性的信息，以实现基于健康风险的替代补救终点。