| Summary: | 碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 94 === The idea of using acoustic wave as a ground water remediation method has recently received attention. In many research results showed that the acoustic wave effect of groundwater remediation is very good, however there is not much study about its mechanism. In this research will focus on the pollution removable mechanism of acoustic wave in ground water remediation. The mechanisms consider the acoustic wave effect on the change of viscosity and the change of water pressure in the pore.
The experiment contains two parts: Glass tank test and Column test. Glass tank test contains three parts: Only has TCE in the glass tank, TCE in the glass tank packed with glass beads and TCE in the glass tank packed with sands. Column test contains two parts: TCE in the water saturated column packed with glass beads and TCE in the water saturated column packed with sands.
The results of Glass tank test experimental showed that there is no viscosity change in stimulation of acoustic wave on test of TCE. For TCE in porous media, acoustic wave stimulation in the frequency range between 120 to 300Hz, and High-Level pressure amplitudes can reduce the viscosity of TCE. These experimental results provide a strong evidence for the mechanism of the acoustic wave increasing pollution removable in porous media.
The results of Column test experimental showed that acoustic wave stimulation with High-Level pressure amplitudes and frequency with 240Hz was observed to increase the effluent TCE concentration. However, the acoustic wave pressure applying in our experimental is not enough causing the obvious effect of increase the effluent TCE concentration, also therefore it have no significant change of water pressure in the pore.
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