Comparing semi-continuous air sampling versus 24-hour bag samples from two flat-bed biofilters with new woodchip media

Kevin A Janni, L. D. Jacobson, Brian Hetchler, J. P. Oliver, L. J. Johnston

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Efforts to manage gas emissions from animal feeding operations are expected to create a need for economical and effective methods to assess mitigation practices. The purpose of this project was to compare gas concentrations measured using semi-continuous sampling with dedicated gas analyzers versus concentrations obtained using a system that fills 50 L bags over 24-h periods. Sampling was done on two flat-bed biofilters with new media, 5 cm or 10 cm, treating air from swine nurseries. Concentration ratios and percent reductions were calculated and compared using concentrations from both sampling methods. The results indicate that 24-h bag concentrations and percent reductions tracked the semi-continuous concentrations and percent reductions well. Ratio means for NH3, CO2 and N2O were close to one indicating similar concentrations using the two methods. The H2S ratio mean was over 1.65 and CH4 ratio means were less than one. Mean percent reduction differences were mixed. CH4 and N2O mean percent reduction differences were near zero but H2S mean percent reduction differences were negative and NH3 mean percent reduction differences were inconsistent. The flat-bed biofilter with 10 cm media removed 61 to 73% of the NH3emitted while the flat-bed biofilter with 5 cm media removed between 6 and 15%. Both biofilters removed between 42 and 65% of the H 2S. The 10 cm media did not generate N2O.

Original languageEnglish (US)
Title of host publicationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012
PublisherAmerican Society of Agricultural and Biological Engineers
Pages2141-2160
Number of pages20
ISBN (Print)9781622762088
StatePublished - Jan 1 2012
EventAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012 - Dallas, TX, United States
Duration: Jul 29 2012Aug 1 2012

Publication series

NameAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012
Volume3

Other

OtherAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012
CountryUnited States
CityDallas, TX
Period7/29/128/1/12

Keywords

  • 24-h sampling
  • Ammonia
  • Biofilters
  • Flat-bed biofilter
  • Hydrogen sulfide
  • Nitrous oxide
  • Removal efficiency
  • Semi-continuous sampling

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