A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Lagring av torkad bark i ventilerad stack. (Storage of dried bark in ventilated pile)
In this report, the storage of dry bark from pine (Pinus sylvestris) in a covered ventilated pile was studied and compared with storage in covered and uncovered part of piles. The bark was dried in batches during the summer of 1992. In early November around 3000 m(sup 3) of crushed bark was built into two piles, each of which was 25 m long, 12 m wide and 5 m high. The test pile was ventilated by placing a 17 m long tunnel, with a central fan tower, under the pile. In order to allow air movement, a number of drainage pipes were placed on the surface of the pile before covering it with a tarpaulin. The average initial moisture content before storage was 37%. After three and half months of storage in the ventilated pile the moisture content was reduced by 10% units. In the control pile, the average reduction in moisture content was only 5% units in both covered and uncovered parts of the pile. The low temperatures prevailing during storage in the ventilated pile allowed limited growth of fungi. The average total count of microfungal spores declined considerably in both covered and uncovered parts of the control pile (2.5 and 5.0 x 10(sup 9) spore/kg d.wt). In the ventilated pile the total number of spores had also declined to 8.0 and 5.4 x 10(sup 9) spore/kg d.wt. in the 4 m and 7 m sections, respectively. The large number of viable spores on the material before storage was clearly reduced after storage, especially in the ventilated pile where many areas had extremely low contents of viable spores. The highest count of viable microspores (grown at 20 and 45 degrees C) was found in the covered part of the control pile (62 x 10(sup 7)) most of which had grown at 20 degrees C. The uncovered part of the pile contained 8 x 10(sup 7) spore/kg d.wt. Dry matter loss was relatively low in all the treatments. Heating value, size distribution and ash content changed marginally during storage in all the tested samples. 9 refs, 6 figs, 12 tabs
Lagring av torkad bark i ventilerad stack. (Storage of dried bark in ventilated pile)
In this report, the storage of dry bark from pine (Pinus sylvestris) in a covered ventilated pile was studied and compared with storage in covered and uncovered part of piles. The bark was dried in batches during the summer of 1992. In early November around 3000 m(sup 3) of crushed bark was built into two piles, each of which was 25 m long, 12 m wide and 5 m high. The test pile was ventilated by placing a 17 m long tunnel, with a central fan tower, under the pile. In order to allow air movement, a number of drainage pipes were placed on the surface of the pile before covering it with a tarpaulin. The average initial moisture content before storage was 37%. After three and half months of storage in the ventilated pile the moisture content was reduced by 10% units. In the control pile, the average reduction in moisture content was only 5% units in both covered and uncovered parts of the pile. The low temperatures prevailing during storage in the ventilated pile allowed limited growth of fungi. The average total count of microfungal spores declined considerably in both covered and uncovered parts of the control pile (2.5 and 5.0 x 10(sup 9) spore/kg d.wt). In the ventilated pile the total number of spores had also declined to 8.0 and 5.4 x 10(sup 9) spore/kg d.wt. in the 4 m and 7 m sections, respectively. The large number of viable spores on the material before storage was clearly reduced after storage, especially in the ventilated pile where many areas had extremely low contents of viable spores. The highest count of viable microspores (grown at 20 and 45 degrees C) was found in the covered part of the control pile (62 x 10(sup 7)) most of which had grown at 20 degrees C. The uncovered part of the pile contained 8 x 10(sup 7) spore/kg d.wt. Dry matter loss was relatively low in all the treatments. Heating value, size distribution and ash content changed marginally during storage in all the tested samples. 9 refs, 6 figs, 12 tabs
Lagring av torkad bark i ventilerad stack. (Storage of dried bark in ventilated pile)
R. Jirjis (author) / P. Lehtikangas (author)
1994
37 pages
Report
No indication
English
Solid Wastes Pollution & Control , Environmental Studies , Fuels , Bark , Storage , Wood wastes , Air Flow , Ash Content , Drying , Fungi , Losses , Moisture , Particle Size , Pines , Spores , Temperature Dependence , Ventilation , Wood Fuels , Foreign technology , EDB/094000
British Library Online Contents | 1999
British Library Online Contents | 2001