Ethanol production from spent sulfite liquor fortified by hydrolysis of pulp mill primary clarifier sludge
- Univ. of British Columbia, Vancouver (Canada)
Some low-yield sulfite pulping operations ferment spent sulfite liquor (SSL) to remove biochemical oxygen demand associated with dissolved sugars while at the same time generating ethanol as a salable product. Simultaneous saccharification and fermentation (SSF) of primary clarifier sludge in a medium of SSL was proposed as a means of reducing the amount of sludge to be disposed of while at the same time increasing ethanol productivity. In this article, the option of fortifying existing SSL fermenting processes with the sugars produced via in situ enzymatic hydrolysis of sulfite primary clarifier sludge (PCS) has been explored. In 100% SSL PCS hydrolysis rates as high as 3.4 g/(L{center_dot}h) were observed at an initial enzyme loading of 10 filter paper units (FPU)/g PCS. To reduce the deleterious effects of glucose inhibition, single-stage SSF was carried out using cellulose enzymes and Saccharomyces cerevisiae. The production rate of ethanol in SSL was increased by as much as 25% through the SSF process. 12 refs., 4 figs., 2 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 598236
- Report Number(s):
- CONF-950587-; ISSN 0273-2289; TRN: 98:001503-0019
- Journal Information:
- Applied Biochemistry and Biotechnology, Vol. 57-58; Conference: 17. symposium on biotechnology for fuels and chemicals, Vail, CO (United States), 7-11 May 1995; Other Information: PBD: Spr 1996
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
55 BIOLOGY AND MEDICINE
BASIC STUDIES
BIOCHEMICAL OXYGEN DEMAND
CELLULOSE
ENZYMATIC HYDROLYSIS
CHEMICAL FEEDSTOCKS
ENZYMES
ETHANOL FUELS
COST
FERMENTATION
GLUCOSE
PRODUCTION
PRODUCTIVITY
SACCHARIFICATION
SACCHAROMYCES CEREVISIAE
SPENT LIQUORS
SLUDGES
BIOMASS
RENEWABLE ENERGY SOURCES
BIOCONVERSION
WASTE PROCESSING
PAPER INDUSTRY
SUBSTRATES
TEMPERATURE DEPENDENCE