ELIMINATION OF PCBS BY SUPERCRITICAL EXTRACTION AND WET OXIDATION

拟议研究工作的具体目标是评估 超临界萃取法和超临界萃取法的技术可行性 湿式氧化(SCWO)工艺去除和销毁卤代芳烃 来自垃圾填埋场的碳氢化合物。超临界技术的优势 比传统废物处理方法更先进的工艺包括 有机物在超临界条件下的溶解度，完全氧化 有机物(在超临界水处理中)，污染物与 减少了溶剂流动，降低了加工过程中的能源成本。此外， 处理后的土壤不会受到任何有毒溶剂的污染 正在处理。 第一个资助期的努力将导致 超临界萃取器的设计、建造和调试 超临界水氧化实验装置。前者的运行温度为200度 100摄氏度和50 ATM到500 ATM，后者在100摄氏度到500 ATM 500摄氏度和50 ATM到600 ATM。这个设施有广泛的能力 对于这个允许获取热力学的研究活动， 在这些条件下的解吸速率和动力学数据在安全和 卫生的环境。关联溶解度数据的热力学模型， 用于鉴定二氧化碳/改性剂(甲醇、丙烷、甲苯)的筛选试验 含有2，4，5/2‘，4’，5‘-六氯联苯/合成土壤样品的体系，以及 选定的SCWO初步可行性实验将已完成。 拟议的研究集中在三个具体目标上。(1)均衡和 将使用以下方法获得Aroclor 1248的SCE的解吸率数据 合成土壤样品和实际的多氯联苯污染样品。分析 数据将确定工艺可行性，并允许进行初步设计。(2) 将进行动力学实验，以获得超临界水的速率数据 从污染物中提取2，4，5/2‘，4’，5‘-六氯联苯和萃取液 土壤。数据分析将确定工艺的可行性和许可 工艺设计估算。(3)实验室规模的单元实验 用合成和实际的土壤样本进行评估和改进 技术将对一个移动单元进行经济分析，以 现场救治。

The specific objectives of the proposed research work are to assess the technical feasibility of supercritical extraction (SCE) and supercritical wet oxidation (SCWO) processes to remove and destroy halogenated aromatic hydrocarbons from waste landfill sites. The advantages of supercritical processes over conventional waste treatment methods include enhanced solubility of organics at supercritical conditions, complete oxidation of organics (in the case of SCWO), simplicity of separation of pollutants from the solvent stream, and reduced energy costs in the processing. Further, the treated soil will not be contaminated with any toxic solvent after processing. The effort during the first funding period will have resulted in the design, construction and commission of supercritical extraction and supercritical water oxidation laboratory units. The former operates at 20o to 100 degrees C and 50 atm to 500 atm, and the latter at 100 degrees C to 500 degrees C and 50 atm to 600 atm. This facility has broad capabilities for this research activity permitting acquisition of thermo-dynamic, desorption rate, and kinetic data at these conditions in a safe and hygienic environment. Thermodynamic models to correlate solubility data, screening tests to identify CO2/modifier (methanol, propane, toluene) systems with 2,4,5/2',4',5'-hexachlorobiphenyl/synthetic soil samples, and selected SCWO preliminary feasibility experiments will have been completed. The proposed research focuses on three specific aims. (1) Equilibrium and desorption rate data will be obtained for SCE of Aroclor 1248 using synthetic soil samples and actual PCB contaminated samples. Analysis of data will determine process feasibility and permit preliminary design. (2) Kinetic experiments will be conducted to obtain SCWO rate data of 2,4,5/2',4',5'-hexachlorobiphenyl and extraction liquids from contaminates soils. Data analysis will determine the process feasibility and permit process design estimations. (3) Bench-scale unit experiments will be executed with synthetic and actual soil samples to evaluate and improve the technology. An economic analysis will be conducted for a mobile unit for on-site treatment.