Potential use of feedlot cattle manure for bioethanol production

Bioresource Technology
T VancovR Stuetz

Abstract

This paper reports on processing options for the conversion of feedlot cattle manures into composite sugars for ethanol fermentation. Small-scale anaerobic digestion trials revealed that the process significantly reduces the content of glucan and xylan (ca. 70%) without effecting lignin. Moreover, anaerobic digestate (AD) fibres were poor substrates for cellulase (Cellic® CTec 2) saccharification, generating a maximum combined sugar yield of ca. 12% per original dry weight. Dilute acid pretreatment and enzyme saccharification of raw manures significantly improved total sugar recoveries, totalling 264 mg/g (79% theoretical). This was attained when manures were pretreated with 2.5% H2SO4 for 90 min at 121°C and saccharified with 50 FPU CTec 2/g glucan. Saccharomyces cerevisiae efficiently fermented crude hydrolysates within 6 h, yielding 7.3 g/L ethanol, representing glucose to ethanol conversion rate of 70%. With further developments (i.e., fermentation of xylose), this process could deliver greater yields, reinforcing its potential as a biofuel feedstock.

References

Oct 31, 2003·Bioresource Technology·Zhiyou WenShulin Chen
Jun 3, 2005·Applied Biochemistry and Biotechnology·S ChenD J Stevens
Jun 3, 2005·Applied Biochemistry and Biotechnology·Wei LiaoShulin Chen
Mar 6, 2007·Biotechnology and Bioengineering·Tina JeohDavid K Johnson
Jun 10, 2010·Bioscience, Biotechnology, and Biochemistry·Svein J Horn, Vincent G H Eijsink
Aug 31, 2010·Applied and Environmental Microbiology·Marcus KleinDavid J Roser
Oct 26, 2010·Bioresource Technology·Charles TeaterWei Liao
May 7, 2011·Journal of Environmental Quality·Jim J MillerBarry M Olson
Nov 25, 2011·Enzyme and Microbial Technology·Youngmi KimMichael R Ladisch
Feb 22, 2012·Bioresource Technology·S McIntoshM Spain
Mar 8, 2013·Carbohydrate Polymers·Terhi K HakalaAnna Suurnäkki

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