Experimental study of the porosity and permeability of municipal solid waste

Abstract

Permeability is a very important parameter to evaluate the landfill gas (LFG) transport properties of municipal solid waste (MSW). Waste permeability is largely dependent on pore structure, which is affected directly by compression stress and degradation. In this article, laboratory tests were conducted to determine the permeability of MSW under different stresses and degradation phases. Test results showed that porosity and permeability values were in the range of 0.11–0.65 and 8.7 × 10−14–7.29 × 10−12 m2, respectively. The porosity of waste samples declined exponentially with the increase of compacted density and linearly with the increase in water content. Permeability decreased significantly with stress and degradation because of the increase in compacted density and finer particles of the waste, which led to low porosity of the samples. The influence of stress on permeability was in the scope of 1.6 × 10−12–3.7 × 10−12 m2, whereas porosity was 0.23–0.34. However, the effect of coupled stress and degradation on permeability was reduced to more than an order of magnitude. The power model was found to be suitable for fresh and degradation wastes, whereas Kozeny–Carman model was only suitable for old wastes. This study provides theoretical and practical significance for environmental pollution control and resource utilization of LFG in landfills. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1694–1699, 2017

Engineered MoSe2‐Based Heterostructures for Efficient Electrochemical Hydrogen Evolution Reaction

“…[88,89] The values obtained for SWCNTs/MoSe 2 are comparable to those reported for MoSe 2 flake/SWCNT compounds (in the order of 10 2 µA cm -2 ). [89] Notably, the highest j 0 value is measured for graphene/MoSe 2, which is a bilayer-like heterostructure consisting of a graphene flake film covered by an homogeneous layer of MoSe 2 flakes (see an overpotential less than 0.2 V), [180,181] thus overcoming the mass loading-related limit of the HER-performance in the single heterostructure.…”

Geotechnical Properties of Fresh and Degraded MSW In the Foothill of Shivalik Range Una, Himachal Pradesh

“…The dry densities of waste exhibit variation in permeability of waste which decreases with a higher degree of compaction [7,32]. The permeability of fresh waste ranges from 10 -8 m/s to 10 -4 m/s and for landfilled sample (degraded sample) it ranges from10 -6 m/s to 10 -14 m/s [33][34][35]. There are few studies existing on analyzing the properties of degradation of waste for landfill stability [20,36].…”

Study on landfill gas migration in landfilled municipal solid waste based on gas–solid coupling model

“…Landfill is generally believed to be the most essential and economic method for the disposal of municipal solid waste (MSW) in most countries . Landfill gas (LFG) is the by‐product generated by anaerobic decomposition of organic waste in sanitary landfills . The composition of LFG is mainly methane and carbon dioxide, and other trace gases .…”

“…[1][2][3] Landfill gas (LFG) is the by-product generated by anaerobic decomposition of organic waste in sanitary landfills. 4,5 The composition of LFG is mainly methane and carbon dioxide, and other trace gases. 6 LFG has great contribution to greenhouse effect, explosion, and other hazards, but it is a better source of clean energy.…”