Performance Study of Infrared Thermal Desorption System to Remediate Contaminated Soil with BTEX

• Main Authors: Kuo, Shenn-Shyan, 郭慎賢
• Other Authors: Kuo-Ching Chang
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/36644561027063818607

碩士 === 國立屏東技術學院 === 環境工程技術研究所 === 85 === This study is intended to investigate the remediation feasibility of a newly developed infrared thermal desorption system. From the viewpoint of energy saving, the major parameters are the system temperature, soil retension time, sweep gas flow rate, BTEX content, and soil water content. The correlations between major parameters and system performance are persued. Batch thermal desorption experiments are performed by spiking fixed amount neat Tay-Kang soil with BTEX solvent to emulate organics-contaminated soil for different polluted conditions. The results show sweep gas flow rate is an auxiliary parameter, and a moderate value of 50 L/min was kept based on performance and energy saving. System temperature is a key parameter for BTEX removal in thermal desorption process and a showed strong energy dependance. The removal efficiencies of BTEX can easily achieve 99.9% by controlling soil retension time adequately. The residue of benzene is 24 mg/kg after 3 minutes at 150℃, but to achieve the same low value for ethylbenzene, system temperature has to be evelated to 200℃ and retension time elongated to 9 minutes. For the high contents of BTEX and soil water, the system must input more energy to overcome the heat transfer resistance and energy loss within contaminated soil. The residue of BTEX in treated soil shows a power law relationship with input energy. The infrared thermal desorption system can resolve the deficiency of commercial thermal desorption technologies, and achieve the goal of high treatment performance. In prospective of practical application for on-site remediation, the newly developed infrared thermal desorption system used in this study shows a promisimg potential.