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Enhancement of solubilization rate of cellulose in anaerobic digestion and its drawbacks

Paper ID Volume ID Publish Year Pages File Format Full-Text
34914 45059 2011 6 PDF Available
Title
Enhancement of solubilization rate of cellulose in anaerobic digestion and its drawbacks
Abstract

Hydrolysis is widely acknowledged as the rate-limiting step in anaerobic digestion of solid cellulose to biogas (methane), and pretreatment is generally considered to facilitate the process. However, few studies have investigated how such pretreatment may affect the rest of this complex process. The present study compared the solubilization rate in anaerobic digestion of cotton linter (high crystalline cellulose), with that of regenerated cellulose (amorphous cellulose), using pretreatment with NMMO. Batch digestions were performed, with the initial cellulose concentrations ranging between 5 and 40 g/l, and during 30 days of incubation, biogas and VFAs production as well as pH and COD changes were measured. The lag time before digestion started was longer for the high crystalline cellulose than for the amorphous one. The maximum solubilization rates of treated cellulose were 842 and 517 mg sCOD/g cCOD/day at the initial cellulose concentration of 5 and 30 g/l, respectively, while the solubilization rate of untreated cellulose never exceeded 417 mg sCOD/g cCOD/day. The difference between the two cellulose types was a direct result of the high rate of hydrolysis inhibiting the acetogenesis/methanogenesis microorganisms, a drawback to the rest of the process.

Keywords
COD, chemical oxygen demand; cCOD, equivalent COD of initial cellulose; sCOD, equivalent COD of dissolved cellulose; rDC, relative dissolved cellulose; Δt, time interval; k, first order hydrolysis rate; VFA, volatile fatty acid; NMMO, N-methylmorpholine-N
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 46, Issue 7, July 2011, Pages 1509–1514
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
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