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This study was carried out to develop the biochemical pulping method to enhance energy saving and decrease the capital cost through the soda pulping under atmospheric ressure(100℃). Nonwood substrates, rice straw, were pretreated by white-rot fungi, Ganoderma lucidum. It has acquired several basic data that can be applied in bio-soda pulping. The results of this study were as follow.
Without any nutrients or with glucose, N and glucose+N the weight losses of rice straws inoculated by Genoderma lucidum were 8.5~29.8%, 9.3~32.1%, 11.8~30.1% and 11.8~24.4% respectively for 5, 10, 15, 20, 25 and 30 days incubation. The more extending incubation periods, the more increasing weight losses. The yield of untreated rice straw was 54.8% after pulping. When any nutrients was not added or glucose, N and glucose+N were added for the pretreatment, the total yields were ranged 50.6~38.5%, 48.6~34.4%, 47.2~38.4% and 49.5~42.6% respectively for 5, 10, 15, 20, 25 and 30 days incubation. The yields were gradually decreased based on extending of incubation.
The physical properties of rice straw soda pulps without fungal treatment, the density, breaking length, burst index, tear index and folding endurance were 0.24 g/㎠, 2.32km, 0.91kPa·㎡/g, 56.7mN·㎡/g and 35 times, respectively. After pretreatment without any nutrients or with glucose, N and glucose+N as nutrients, the density was 0.27~0.30 g/㎠, the breaking length 3.14~5.25 km, burst index 1.42~2.78 kPa·㎡/g, tear index 45.8~64.5mN·㎡/g and folding endurance 47~288 times at all incubating periods when pulping was done.
The physical properties were increased with the increasing incubation periods. However, when glucose+N was added, the physical properties were shown superior results each incubating duration.
Without any nutrients or with glucose, N and glucose+N the weight losses of rice straws inoculated by Genoderma lucidum were 8.5~29.8%, 9.3~32.1%, 11.8~30.1% and 11.8~24.4% respectively for 5, 10, 15, 20, 25 and 30 days incubation. The more extending incubation periods, the more increasing weight losses. The yield of untreated rice straw was 54.8% after pulping. When any nutrients was not added or glucose, N and glucose+N were added for the pretreatment, the total yields were ranged 50.6~38.5%, 48.6~34.4%, 47.2~38.4% and 49.5~42.6% respectively for 5, 10, 15, 20, 25 and 30 days incubation. The yields were gradually decreased based on extending of incubation.
The physical properties of rice straw soda pulps without fungal treatment, the density, breaking length, burst index, tear index and folding endurance were 0.24 g/㎠, 2.32km, 0.91kPa·㎡/g, 56.7mN·㎡/g and 35 times, respectively. After pretreatment without any nutrients or with glucose, N and glucose+N as nutrients, the density was 0.27~0.30 g/㎠, the breaking length 3.14~5.25 km, burst index 1.42~2.78 kPa·㎡/g, tear index 45.8~64.5mN·㎡/g and folding endurance 47~288 times at all incubating periods when pulping was done.
The physical properties were increased with the increasing incubation periods. However, when glucose+N was added, the physical properties were shown superior results each incubating duration.
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