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This study was carried out to evaluate the variation in the static pressure of the air, when it is forced to pass through organic composite columns at both different maturation times and material heights. For accomplishing the experiment, a composting pile was set up with sugarcane bagasse and chicken bed, by preparing the mixture on such a way to obtaining an initial C/N relationship equal to 30/1.The material was revolved every three days during the first month, following the revolution at regular 5-day intervals for 2 months more. In the sugarcane bagasse under the same conditions it was used in the mixture, as well as in the material of the bagasse + chicken bed mixture under the conditions they were after 30, 60 and 90 days under composting process, the load loss was measured at 1m upwards the column height. The decrease in the values of the air static pressure was increased with either the increased air flow imposed by the fan and the biochemical degradation time of the material under composting process; such a decrease was proportional to the logarithm of the vertical column depth of the organic compost.

PERDA DE CARGA NO FLUXO DE AR FORÇADO EM COLUNAS DE MATERIAL ORGÂNICO COM DIFERENTES PROFUNDIDADES E ESTÁDIOS DE DEGRADAÇÃO BIOQUÍMICA