Biogas production from wheat straw in batch and UASB reactors: The roles of pretreatment and seaweed hydrolysate as a co-substrate.

Research output: Contribution to journalArticle

Abstract

This research evaluated biogas production in batch and UASB reactors from pilot-scale acid catalysed steam pretreated and enzymatic hydrolysed wheat straw. The results showed that the pretreatment was efficient and, a sugar yield of 95% was obtained. The pretreatment improved the methane yield (0.28m(3)/kg VS(added)) by 57% compared to untreated straw. Treatment of the straw hydrolysate with nutrient supplementation in a UASB reactor resulted in a high methane production rate, 2.70m(3)/m(3).d at a sustainable OLR of 10.4kg COD/m(3).d and with a COD reduction of 94%. Alternatively, co-digestion of the straw and seaweed hydrolysates in a UASB reactor also maintained a stable anaerobic process and can thus reduce the cost of nutrients addition. We have shown that biogas production from wheat straw can be competitive by pretreatment, high methane production rate in UASB reactors and also by co-digestion with seaweed hydrolysate.

Details

Authors
  • Valentine Nkemka
  • Marika Murto
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Industrial Biotechnology
Original languageEnglish
Pages (from-to)164-172
JournalBioresource Technology
Volume128
Publication statusPublished - 2013
Publication categoryResearch
Peer-reviewedYes