MICROSCOPIC RESEARCH ON AIR SPARGING I-NETWORK MODEL DEVELOPMENT

摘要

Air sparging is an accepted technology for remediation of soils contaminated with volatile organic compounds (VOCs). The air sparging technology relies on air bubble movement below water-table for soil remediation. To understand the mechanism of bubble migration during air sparging a microscopic network model is proposed. The proposed network captures both the geometrical information including pore size and throat size distributions with their correlation and the topological information including the distribution of coordination number. Methods for estimating or acquiring the geometrical and topological information of soil structure are also suggested. The Biconical abscissa Asymmetric CONcentric (BACON) bond was introduced to modify the traditional method of directly assigning pore throat sizes without additional information on shape of the bond and position of the throat. To match the distribution of the coordination number, four algorithms were suggested for diluting the fully connected network with a coordination number of 26. The compression of the sparse connection matrix and algorithm by searching for isolated nodes and clusters are also proposed. Finally, the approaches for microscopic research on effect of shape and size of pore body and bond on bubble flow are presented. This paper lays basis for further microscopic research on air sparging by network model.