Bioavailability & remediation of complex DNAPLs

生物利用度

• 批准号: 6577209
• 负责人: MARK BRUSSEAU
• 金额: $ 14.22万
• 依托单位: UNIVERSITY OF ARIZONA
• 依托单位国家: 美国
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-04-01 至 2003-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6577209
• 关键词: biotransformation; environmental contamination; environmental toxicology; environmental transport; hazardous substances; mathematical model; microorganism metabolism; model design /development; phase change; soil pollution

DESCRIPTION: (Taken from application) The goal of the proposed research is to enhance the understanding of the dissolution bioavailability, and remediation of complex, multi- component, dense non-aqueous-phase immiscible organic liquids (DNAPLs) in sub-surface system. The specific objectives are: (1) investigate the effects of DNAPL composition and mass-transfer constrains on the dissolution of complex (multi-component) DNAPL; (2) investigate the bioavailability and biodegradation of complex DNAPLs; (3) investigate the effect of solubilization agents on the dissolution and bioavailability of complex DNAPLs; (4) develop and evaluate advanced mathematical models capable of simulating the dissolution, biodegradation, and transport of DNAPL constituents in heterogeneous porous media. These objectives are addressed by taking a multi-step approach where these factors will first be characterized separately, and then integrated by the combined use of "multiple-factor" experiments and mathematical modeling. We have developed systems that allow the simultaneous characterization of NAPL dissolution, contaminant transport and biodegradation, and microbial activity. For example, selected experiments will use a flow cell/fiber optic detection system that has been equipped with multiple sensors and detectors. The results of the proposed research will enhance our understanding of the dissolution and bioavailability of DNAPL mixtures in subsurface system. These results would significantly improve the ability to conduct accurate risk assessments of the potential human-health-related impacts of contaminated sites. Furthermore, the results will assist in related impacts of contaminated sites. Furthermore, the results will assist in the design and implementation of more effective remediation systems. The results will also be pertinent to the issue of alternative, risk-based clean-up standards.

产品说明：（摘自应用）本研究的目的是提高对地下系统中复杂、多组分、致密非水相不混溶有机液体（DNAPLs）的溶解生物利用度和修复的认识。具体目标是：（1）考察了DNAPL组成和传质约束对络合物溶解的影响（2）考察了复合DNAPLs的生物利用度和生物降解性，（3）考察了增溶剂对复合DNAPLs溶出度和生物利用度的影响;（4）开发和评估能够模拟DNAPL组分在非均质多孔介质中的溶解、生物降解和迁移的先进数学模型。这些目标是通过采取一个多步骤的方法，这些因素将首先被单独表征，然后通过结合使用“多因素”实验和数学建模集成。我们已经开发出系统，允许同时表征NAPL溶解，污染物传输和生物降解，以及微生物活性。例如，选定的实验将使用配备有多个传感器和检测器的流动池/光纤检测系统。该研究结果将有助于加深我们对DNAPL混合物在地下系统中的溶解和生物利用度的理解。这些结果将大大提高对受污染场地可能对人类健康产生的影响进行准确风险评估的能力。此外，研究结果将有助于污染场地的相关影响。此外，研究结果将有助于设计和实施更有效的补救制度。研究结果还将涉及基于风险的替代性清理标准问题。