Geotechnical Engineering Journal of the SEAGS & AGSSEA ISSN 0046-5828
Vol. 55 No. 2 June 2024
Test Equipment and Application of Gas Permeation Characteristic of MSW
Gang Zeng and Dan Hu
ABSTRACT: In order to study the gas permeation characteristics of municipal solid waste (MSW), a set of test equipment is independently developed. The experimental equipment has the function of measuring gas permeability, porosity and gas preferential flow parameters of MSW. The composition and operation method of the equipment are introduced. What’s more, the laboratory tests on gas permeation of MSW under the influence factors of initial pressure and moisture content are carried outby the self-developed equipment. Test application results show that the equipment can realize all pre-designed functions. 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. When the moisture content is 54.6%, 70.6% and 86.6%as the initial pressure is 0.05 MPa, the gas permeability of MSW is 1.096×10-12 m2, 0.937×10-12 m2, and 0.787×10-12 m2, respectively, and the porosity is 0.573, 0.501 and 0.358, respectively. When the initial pressure of 0.02 MPa, 0.05 MPa and 0.1 MPa as the moisture content is 54.6%, the peak value of gas flow rate at the outlet of MSW is 0.006 L/s, 0.012 L/s and 0.02 L/s, respectively, and the time of gas passing through the sample is 47s, 58s and 65s, respectively. The research results enrich the experimental equipment for studying the gas permeation characteristics of MSW, and provide data support for the subsequent research on migration model of landfill gas.
KEYWORDS: Municipal solid waste, Gas permeability, Porosity, Gas preferential flow, and Laboratory test.
