Monitoring moisture content of gas-phase biofilter based on impedance under different conditions

Zhonghua Zheng, Liangcheng Yang, Xinlei Wang

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

Abstract

The woodchips-based gas phase biofilter is capable of mitigating airborne ammonia efficiently. The ability to monitor real-time moisture content of biofilter media is preferred for maintaining the ammonia mitigation efficiency. The focus of this study is to enhance the understanding of impedance-based moisture content measurement and improve methodologies to monitor the moisture content of gas phase ammonia mitigation biofilters more accurately. A proposed sensor consisting of a sensing unit (three parallel plates) and a circuit generating DC voltage outputs was used in the study. The sensor readings changed with step-wise increase of moisture content as well as different particle size distribution and nitrogen (ammonia-nitrogen, nitrate-nitrogen) concentrations of biofilter media. The results showed the particle size distribution and nitrogen concentrations have significant impacts on impedance-based moisture sensing. A mathematical model was established to correlate the sensor reading of the impedance-based moisture sensor with moisture content, ammonia-nitrogen concentration, and nitrate-nitrogen concentration based on experimental results. Further studies are needed to improve the performance of the sensor considering other potential factors.

Original languageEnglish (US)
Title of host publication2016 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2016
PublisherAmerican Society of Agricultural and Biological Engineers
ISBN (Electronic)9781510828759
DOIs
StatePublished - Jan 1 2016
Event2016 ASABE Annual International Meeting - Orlando, United States
Duration: Jul 17 2016Jul 20 2016

Publication series

Name2016 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2016

Other

Other2016 ASABE Annual International Meeting
CountryUnited States
CityOrlando
Period7/17/167/20/16

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Keywords

  • Gas phase biofilter
  • Impedance
  • Moisture sensor
  • Nitrogen concentration
  • Particle size distribution

ASJC Scopus subject areas

  • Bioengineering
  • Agronomy and Crop Science

Cite this

Zheng, Z., Yang, L., & Wang, X. (2016). Monitoring moisture content of gas-phase biofilter based on impedance under different conditions. In 2016 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2016 (2016 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2016). American Society of Agricultural and Biological Engineers. https://doi.org/10.13031/aim.20162461021