Abstract
A study was carried out to examine the variability, over a two-week period, of municipal solid waste (MSW) at the Baltimore County Resource Recovery Facility in Cockeysville, Haryland. Samples of municipal solid waste which had been processed through a primary shredder were collected daily for two weeks. After the total moisture content was determined, the samples were reduced in particle size to 2mm or less. A total of 40 samples were prepared for measurements. Testing was carried out for residual moisture, furnace ash, bomb ash, and calorific or higher heating value. The daily variability (i.e., excluding the within bag variability) of MSW is 36 % and 37 % for moisture and ash, respectively. The combustible fraction of MSW is directly related to the moisture and bomb-ash free higher heating value (HHV3-B) which has a daily variability (i.e., excluding the within bag variability) of only 4%. Statistical analysis of the data suggests that the day to day variability of MSW constitutes 70 to 30% of the overall variability, with the other variables being errors in sampling, size reduction procedures, and measurement techniques.
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