| Summary: | 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.
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