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Study of polluted soil remediation based on freezing and thawing cycles

Research in Cold and Arid Regions 2014年第4期6卷 322-330页

作者： DaHu Rui BaiYang Song Yuzuru Ito Li Wang School of Civil Engineering Henan Polytechnic University Dept. of Civil Engineering Setsunan University Neyagawa

It is generally known that soil pollution poses a terrible hazard to the environment, but the present techniques of contaminated soil remediation cannot control this growing threat. This paper compares the pollutant extraction efficiency of traditional pumping and treating, which is a typical washing technology for the remediation of contaminated soils, with methods that utilize freeze-thaw cycles. In the soil freezing process, water shifts from unfrozen soils to the freezing front, and the permeability of soil will be enhanced under certain temperature gradients and water conditions. Therefore, this paper discusses the purification of contaminated soil through freeze-thaw action. We conducted a cleansing experiment on clay and silica sand infused with NaCl（simulation of heavy metals） and found that the efficiency of purification was enhanced remarkably in the latter by the freeze-thaw action. To assess the effective extraction of DNAPLs in soil, we conducted an experiment on suction by freezing, predicated on the different freezing points of moisture and pollutants. We found that the permeability coefficient was significantly increased by the freezing-thawing action, enabling the DNAPL contaminants to be extracted selectively and effectively.

关键词： soil pollution remediation washing technology freezing process thawing process moisture migration

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Detection of Accidental Fish Defrosting Using Non-Destructive Ultrasonic Technique

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Journal of Food Science and Engineering 2011年第1期1卷 20-26页

作者： M. Malainine B. Faiz A. Moudden D. Decultot D. Izbaim G. Maze I. Aboudaoud Laboratory of Metrology and Information Treatment Faculty of Sciences University lbn Zohr Agadir 80000 Morocco Laboratory LMSTI Superior School of Technology University Ibn Zohr Agadir 80000 Morocco Laboratory LAUE University of Le Havre Le Havre 76063 France

A non invasive ultrasonic method is used to detect whether or not the frozen fish has suffered a partial or total accidental thawing. The time of flight and the peak to peak amplitude of the ultrasonic signals backscattered by fish are recorded during thawing. The comparison of the evolution curves and images corresponding to first and second thawing shows indicators of accidental thawing. The monitoring of thawing process showed that its assessment can be reduced to the measurement of the water content lost by fish. The attempt to replace the original water lost by fish in first thawing is analyzed. The influence of the transducer frequency on fish thawing evaluation is tested.

关键词： Ultrasound non-destructive evaluation fish defrosting thawing process

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