Saesongslagring av Bark fran Vatlagrade Stockar (Seasonal Storage of Bark from Wet Stored Logs)

摘要

The aim of the study was to investigate the possibility of reducing moisture content in bark, removed from wet saw logs, by long term storage. For this purpose, a total of 2350 cu m (loose volume) of bark was built into 4 sections, two were set indoors and the other two were outdoors. The piles were constructed at a chipping site in Boksholm, Vaxjo in August 1986 and demolished in February 1987. Two sections, 8 m wide by 4 m high and 14 m by 7 m respectively were set outdoor in one pile. Identical pile was set indoors. The gross calorific value (W sub k) of the stored bark increased in all the four sections, but the net calorific value (W sub eff) remained unchanged or declined after storage. Due to the high dry matter loss the average energy content of the stored bark was reduced by 20 percent while the percentage of ash content increased. The study shows that storage of bark which was removed from saw logs stored in water, is not economically worth while because of the high matter losses and the reduction in the energy content of the material. In addition the presence of high number of spores on the material could be a health risk.