Ethanol production from spent sulfite liquor fortified by hydrolysis of pulp mill primary clarifier sludge

Journal Article · Tue Dec 31 04:00:00 EST 1996 · Applied Biochemistry and Biotechnology

DOI:https://doi.org/10.1007/BF02941751· OSTI ID:598236

Moritz, J W; Duff, S J.B. ^[1]

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1. 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--
• Journal Information: Applied Biochemistry and Biotechnology, Journal Name: Applied Biochemistry and Biotechnology Vol. 57-58; ISSN ABIBDL; ISSN 0273-2289
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
55 BIOLOGY AND MEDICINE
BASIC STUDIES
BIOCHEMICAL OXYGEN DEMAND
BIOCONVERSION
BIOMASS
CELLULOSE
CHEMICAL FEEDSTOCKS
COST
ENZYMATIC HYDROLYSIS
ENZYMES
ETHANOL FUELS
FERMENTATION
GLUCOSE
PAPER INDUSTRY
PRODUCTION
PRODUCTIVITY
RENEWABLE ENERGY SOURCES
SACCHARIFICATION
SACCHAROMYCES CEREVISIAE
SLUDGES
SPENT LIQUORS
SUBSTRATES
TEMPERATURE DEPENDENCE
WASTE PROCESSING