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首页> 外文期刊>Separation and Purification Technology >Separation of polyaromatic hydrocarbons from contaminated soils using microwave heating
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Separation of polyaromatic hydrocarbons from contaminated soils using microwave heating

机译：使用微波加热从污染土壤中分离多芳烃

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摘要

The microwave treatment of soils contaminated with heavy- and light-hydrocarbons was investigated. The soils were characterised to determine the total organic liquid content and PAH contents, and the dielectric properties of the soils were measured across a range of temperatures. The heavy- and light-contaminated soils behaved very differently in a microwave environment, with bulk soil temperatures limited to 100°C for the light-contaminated soil. Microwave treatment is shown to remove PAHs from both the heavy- and light-contaminated soils, and it is demonstrated that 95%+ PAH removal can be achieved under moderate processing conditions. Complete remediation of the soils is possible at high microwave powers or long residence times. It is shown that PAH removal can take place at bulk temperatures well below the boiling point of those compounds and a number of explanations are proposed for this behaviour. The mechanisms of PAH removal are investigated for both the heavy- and light-contaminated soils and thermal desorption, selective heating and entrainment mechanisms can all be exploited.This is the first step in the development of a continuous microwave treatment process for the removal of PAHs from contaminated soil on an industrial scale.
机译：研究了用微波处理土壤中重烃和轻烃的污染情况。表征土壤以确定总有机液体含量和PAH含量，并在一定温度范围内测量土壤的介电性能。在微波环境中，重度污染和轻度污染的土壤的行为有很大不同，对于轻度污染的土壤，散装土壤的温度限制在100°C以内。微波处理显示可以从重度和轻度污染的土壤中去除PAHs，并且证明在中等加工条件下可以实现95％+的PAHs去除。在高微波功率或长停留时间的情况下，可以对土壤进行完全修复。结果表明，PAH的去除可以在远低于这些化合物沸点的整体温度下进行，并且对此行为提出了许多解释。对重污染和轻污染土壤的PAH去除机理进行了研究，并且可以进行热脱附，选择性加热和夹带机理。这是开发连续微波处理工艺以去除PAH的第一步从工业规模的污染土壤中提取。

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