Partial biofiltration of exhaust air from a hybrid ventillated deep-pit swine finisher barn

Steven J. Hoff, Jay D. Harmon, Lide Chen, Kevin A. Janni, David R. Schmidt, Richard E. Nicolai, Larry D. Jacobson

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


A strategy for providing partial biofiltration of a critical minimum amount of ventilation air (CMVR) from a hybrid ventilated swine finishing facility was developed and tested. The CMVR, defined as the minimum treated exhaust air that suppressed nighttime curtain opening movement, was set at 81 m3 h-1 pig-1 with the intention of providing enough fan ventilation to suppress inlet curtain movement during stable atmospheres, providing biofiltering for a high percentage of exhaust air. Two side-by-side 300-head hybrid ventilated deep-pit swine finishing rooms were used for this research, one room as the control (CTL) with the other treatment (TRT). The TRT room was fitted with a wood-chip based biofilter for scrubbing the CMVR. In terms of total room emissions, the TRT room had an average odor emission 37% less than the CTL room. Ammonia emission was 58% lower for the TRT room as compared to the CTL room. The results presented indicate that a strategy of partial biofiltration can result in significant reductions in odor and ammonia emissions when applied to hybrid ventilated swine finishing barns.

Original languageEnglish (US)
Pages (from-to)269-280
Number of pages12
JournalApplied Engineering in Agriculture
Issue number2
StatePublished - 2009


  • Ammonia
  • Biofilters
  • Emissions
  • Odor
  • Partial biofiltration


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