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The energy balance in farm scale anaerobic digestion of crop residues at 11–37 °C

Paper ID Volume ID Publish Year Pages File Format Full-Text
36315 45128 2007 8 PDF Available
Title
The energy balance in farm scale anaerobic digestion of crop residues at 11–37 °C
Abstract

Crop residues can be used for biogas production in farm scale reactors. Use of a process temperature below mesophilic conditions reduces the need for heating as well as investment and operating costs, although it may also reduce the methane yield. In the present study the effect of temperature on net energy output was studied using sugar beet tops and straw as substrates for two pilot-scale reactors. Digestion was found to be stable down to 11 °C and optimal methane yield was obtained at 30 °C. The methane yield and process performance was studied at 15 °C and 30 °C as organic loading rates were increased. It was found that the highest net energy production would be achieved at 30 °C with a loading rate of 3.3 kg VS m−3 day−1. Running a low-cost process at ambient temperatures would give a net energy output of 60% of that obtained at 30 °C.

Keywords
Anaerobic digestion; Crop residues; Energy balance; Farm-scale; Low temperature; Pilot-scale
First Page Preview
The energy balance in farm scale anaerobic digestion of crop residues at 11–37 °C
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 42, Issue 1, January 2007, Pages 57–64
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering