Test Equipment and Application of Gas Preferential Flow Characteristic of Municipal Solid Waste

Abstract

 In order to study the gas preferential flow characteristics of municipal solid waste (MSW), a set of test equipment was independently developed. The experimental equipment had the function of measuring gas permeability, porosity and gas preferential flow parameters of MSW. The composition and operation method of the equipment were introduced. What's more, the laboratory tests on gas permeation of MSW under the influence factors of initial pressure and moisture content were carried out. The experimental results showed that the peak value of gas breakthrough curve increased gradually with the increase of initial pressure, and increased with the increase of moisture content. In addition, a mathematical model for describing gas preferential flow in the macro-porous region and the fractured region was established. The whole process of gas passing through the MSW was simulated by the established model. The model simulation results showed that the peak value of gas breakthrough curve increases with the ratio of fissure to pore permeability, while the time of gas passing through the sample decreases with the ratio of fissure to pore permeability. The peak value of gas breakthrough curve decreases gradually with the decrease of the proportion of fracture area in pore space.