Sequestration Mechanisms and Bioavailability of Tetrachloroethene and Toluene in Solid Waste

固体废物中四氯乙烯和甲苯的封存机制和生物利用度

• 批准号: 0001700
• 负责人: Morton Barlaz
• 金额: $ 56.66万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2006-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0001700&HistoricalAwards=false
• 关键词: Sequestration; Mechanisms; Bioavailability; Tetrachloroethene; Toluene

0001700 Barlaz The objective of this research is to study factors that control the fate and bioavailability of tetrachloroethene (PCE) and toluene in landfills with a specific focus on contaminant sequestration and biodegradation as influenced by the presence of humic substances in solid matrices, and acidogenic and methanogenic leachate. The specific objectives are to: (1) estimate the distribution of sorbed contaminants in solid waste by measuring the sorptive capacity of the dominant organic waste components in both fresh and biodegraded form, (2) determine whether contaminant sorption is reduced as a result of contaminant binding by dissolved organic macromolecules in landfill leachate, (3) determine the impacts of aging and leachate composition on contaminant desorption rates, (4) identify relationships between chemical and physical changes in the decomposing sorbent matrix and the bioavailability and sequestration of PCE and toluene, (5) compare rates of desorption and biodegradation of fresh and aged contaminants to determine whether desorption limits bioavailability, and (6) identify whether covalent and/or noncovalent associations with humic materials are important for the sequestration of PCE and toluene in the solid waste. This research will provide information on how contaminants may be expected to behave in landfills over long periods of time and will support the development of models to predict contaminant fate in landfills. ***

0001700 Barlaz本研究的目的是研究控制四氯乙烯（PCE）和甲苯在垃圾填埋场的命运和生物利用度的因素，特别关注污染物的封存和生物降解的影响，在固体基质中的腐殖物质的存在下，产酸和产甲烷渗滤液。 具体目标是：（1）通过测量新鲜和生物降解形式的主要有机废物组分的吸附能力来估计固体废物中吸附污染物的分布，（2）确定污染物吸附是否由于垃圾渗滤液中溶解的有机大分子与污染物结合而减少，（3）确定老化和渗滤液组成对污染物解吸速率的影响，（4）确定分解吸附剂基质中的化学和物理变化与PCE和甲苯的生物利用度和隔离之间的关系，（5）比较新鲜和老化污染物的解吸和生物降解速率，以确定解吸是否限制生物利用度，以及（6）确定与腐殖物质的共价和/或非共价缔合对于固体废物中PCE和甲苯的螯合是否重要。 这项研究将提供关于污染物在垃圾填埋场中长期行为的信息，并将支持开发模型来预测垃圾填埋场中污染物的命运。***