Bioavailability & remediation of complex DNAPLs

描述：(取自应用)拟议研究的目标是加强对地下系统中复杂的、多组分的、稠密的非水相不混溶有机液体(DNAPL)的溶解、生物利用度和修复的了解。具体目标是：(1)考察DNAPL的组成和传质约束对复杂(多组分)DNAPL的溶出的影响；(2)考察复合DNAPL的生物利用度和生物降解性；(3)考察增溶剂对复杂DNAPL的溶解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、生物降解和传输的高级数学模型。这些目标是通过采取多步骤方法来实现的，在这种方法中，这些因素首先将被单独描述，然后通过组合使用“多因素”实验和数学建模来整合。我们已经开发了能够同时表征NAPL溶解、污染物传输和生物降解以及微生物活性的系统。例如，选定的实验将使用配备了多个传感器和检测器的流动池/光纤检测系统。研究结果将加深我们对DNAPL混合物在地下系统中的溶解和生物利用度的了解。这些结果将大大提高对受污染场地对人类健康的潜在影响进行准确风险评估的能力。此外，研究结果将有助于研究受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。结果还将与替代的、基于风险的清理标准的问题有关。

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.