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The energy balance in farm scale anaerobic digestion of crop residues at 11-37 degrees C

Författare

Summary, in English

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 degrees C and optimal methane yield was obtained at 30 degrees C. The methane yield and process performance was studied at 15 degrees C and 30 'C as organic loading rates were increased. It was found that the highest net energy production would be achieved at 30 degrees 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 degrees C. (c) 2006 Elsevier Ltd. All rights reserved.

Publiceringsår

2007

Språk

Engelska

Sidor

57-64

Publikation/Tidskrift/Serie

Process Biochemistry

Volym

42

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Industrial Biotechnology

Nyckelord

  • pilot-scale
  • temperature
  • low
  • farm-scale
  • energy balance
  • anaerobic digestion
  • crop residues

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1873-3298