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Tests were carried out on an immature municipal solid waste (MSW) and sewage sludge compost to determine the resistance to airflow through this material. The material was contained in a three-section, plywood column with a 0.36m2square cross section. Air was blown through the material using a 1.5 kW centrifugal fan at varying rates and the pressure drop across the material was measured with a simple u-tube manometer. Three depths of material were tested: 680mm, 1450mm, and 2200mm. At each depth, the pressure drop was a power function of flow rate and the coefficients and exponents varied linearly with depth of material.
R. Mu and J. Leonard 1999. MEASUREMENT OF AIR FLOW THROUGH MSW-SEWAGE SLUDGE COMPOST. Canadian Agricultural Engineering 41(2):93-97.
Canadian Society for Bioengineering