Biofilter performance of pine nuggets and lava rock as media

Neslihan Akdeniz, Kevin A. Janni, Ilya A. Salnikov

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


Wood chips and bark mulch are commonly used biofilter media because they are generally locally available and inexpensive. Nevertheless, these organic materials degrade and require replacement every 2-5. years. In this study, airflow characteristics and gas reduction efficiencies of two alternative biofilter media (pine nuggets and lava rock) with high porosity and potentially longer service lives were evaluated at three empty bed contact times (1, 3, and 5. s) and two moisture levels (82% and 90% relative humidity). The lava rock had a lower pressure drop across the media and maintained higher media depth. Gas reduction efficiencies were highest for lava rock at 5. s empty bed contact time and 90% humidity. The reduction efficiencies at these conditions were 56%, 88%, 87%, 25%, and 0.7% for ammonia, hydrogen sulfide, total reduced sulfur, methane and nitrous oxide, respectively. Odor reduction up to 48% was observed but was not consistent.

Original languageEnglish (US)
Pages (from-to)4974-4980
Number of pages7
JournalBioresource Technology
Issue number8
StatePublished - Apr 2011

Bibliographical note

Funding Information:
This project was funded by Minnesota Pork Board . The authors acknowledge junior scientist Troy A. Schaar for his assistance in experiment design and set-up. The authors also acknowledge Dr. Aaron Rendahl for his assistance in statistical analysis.


  • Biofilter
  • Greenhouse gas
  • Lava rock
  • Odor
  • Pine nuggets


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