排序方式: 共有4条查询结果,搜索用时 15 毫秒
1
1.
Bioconversion of lignocellulosic waste from selected dumping sites in Dar es Salaam,Tanzania 总被引:2,自引:0,他引:2
The poor management of solid wastes in Tanzania urban centers is a chronic problem that has increasingly become a source of environmental pollution. Bioconversion offers a cheap and safe method of not only disposing these wastes, but also it has the potential to convert lignocellulosic wastes into usable forms such as reducing sugars that could be used as food. This paper reports a preliminary study on the physical characteristics, acid pretreatment, saccharification by cellulase from Trichoderma reesei and fermentation by Saccharomyces cerevisiae of the lignocellulosic component of the solid wastes collected from various dumping sites located in Kinondoni Municipality, Dar es Salaam city. The results showed that overall, the lignocellulosic component constitute about 50% of solid wastes dumped in the study areas. Maximum production of reducing sugars was obtained after 6 h of saccharification while highest concentrations of bioethanol were achieved after 48 h of fermentation. Microbial bioconversion of lignocellulose component yielded up to 21% bioethanol. 相似文献
2.
Continuous production of lignin-degrading enzymes by Bjerkandera adusta immobilized on polyurethane foam 总被引:1,自引:1,他引:0
Continuous production of lignin-degrading enzymes by Bjerkandera adusta immobilized on polyurethane foam gave maximum activities of 220 U lignin peroxidase ml–1, 150 U manganese peroxidase ml–1, 50 U laccase ml–1 and 6.2 U protease ml–1 at the retention time of 24 h for 60 days. Protease secretion destabilized the produced lignin peroxidase, manganese peroxidase and laccase. 相似文献
3.
Anaerobic fermentation was attempted to produce methane from the wood chip (Eucalyptus globulus). By the pretreatment of the wood chip using hot water with high temperature, NaOH, and steam explosion, the production of
methane gas was enhanced. The pretreatment using steam explosion resulted in more amount of methane gas produced than the
treatment using either hot water or 1% (w/w) NaOH with high temperature, and the steam explosion at a steam pressure of 25
atm and a steaming time of 3 min was the most effective for the methane production. The amount of methane gas produced depended
on the ratio of weight of Klason lignin, a high molecular weight lignin, in the treated wood chip. 相似文献
4.
Yoshitoshi?NakamuraEmail author Godliving?Mtui 《Biotechnology and Bioprocess Engineering》2003,8(5):294-298
Endocrine-disrupting phenolic compounds in the water were degraded by laccase fromTrametes sp. followed by activated sludge treatment. The effect of temperature on the degradation of phenolic compounds and the production
of organic compounds were investigated using endocrine-disrupting chemicals such as bisphenol A, 2,4-dichlorophenol, and diethyl
phthalate. Bisphenol A and 2,4-dichlorophenol disappeared completely after the laccase treatment, but no disappearance of
diethyl phthalate was observed. The Michaelis-Menten type equation was proposed to represent the degradation rate of bisphenol
A by the lacasse under various temperatures. After the laccase treatment of endocrine-disrupting chemicals, the activated
sludge treatment was attempted and it could convert about 85 and 75% of organic compounds produced from bisphenol A and 2,4-dichlorophenol
into H2O and CO2, respectively. 相似文献
1