Evaluating the influences of mixing strategies on the Biochemical Methane Potential test

Research output: Contribution to journalArticle

Abstract

Mixing plays an important role in the Biochemical Methane Potential (BMP) test, but only limited efforts have been put into it. In this study, various mixing strategies were applied to evaluate the influences on the BMP test, i.e., no mixing, shaking in water bath, shake manually once per day (SKM), automated unidirectional and bidirectional mixing. The results show that the effects of mixing are prominent for the most viscous substrate investigated, as both the highest methane production and highest maximal daily methane production were obtained at the highest mixing intensity. However, the organic removal efficiencies were not affected, which might offer evidence that mixing helps the release of gases trapped in digester liquid. Moreover, mixing is required for improved methane production when the digester content is viscous, conversely, mixing is unnecessary or SKM might be sufficient for the BMP test if the digester content is quite dilute or the substrate is easily degraded.

Details

Authors
  • Bing Wang
  • Annika Björn
  • Sten Strömberg
  • Nges Ivo Achu
  • Mihaela Nistor
  • Jing Liu
Organisations
External organisations
  • Linköping University
  • Bioprocess Control AB
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Environmental Biotechnology

Keywords

  • Anaerobic digestion, Biochemical methane potential, Degradation kinetics, Mixing, Viscosity
Original languageEnglish
Pages (from-to)54-59
Number of pages6
JournalJournal of Environmental Management
Volume185
Publication statusPublished - 2017 Jan 1
Publication categoryResearch
Peer-reviewedYes