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Related Experiment Videos

Effect of substrate Henry's constant on biofilter performance.

Xueqing Zhu1, Makram T Suidan, Amy Pruden

  • 1Department of Civil and Environmental Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA.

Journal of the Air & Waste Management Association (1995)
|April 30, 2004
PubMed
Summary

Biofiltration of volatile organic compounds (VOCs) shows removal efficiency is linked to Henry

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Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Chemical Engineering

Background:

  • Volatile organic compounds (VOCs) pose environmental and health risks, necessitating effective removal strategies.
  • Trickle-bed biofilters are a common technology for treating VOCs, but their efficiency depends on various factors.
  • Understanding the relationship between VOC properties, such as Henry's constant, and biofilter performance is crucial.

Purpose of the Study:

  • To investigate the impact of substrate solubility (Henry's constant) on the removal of different VOCs in trickle-bed biofilters.
  • To identify potential rate-limiting steps in VOC biofiltration based on Henry's constant values.
  • To explore the role of oxygen and denitrification in biofilter performance for various VOCs.

Main Methods:

Related Experiment Videos

  • Experimental study using trickle-bed biofilters with four VOCs (butanol, ether, toluene, hexane) exhibiting a range of Henry's constants.
  • Analysis of VOC removal efficiency and identification of rate-limiting steps (mass transfer, oxygen transfer).
  • Microbial community analysis using denaturing gradient gel electrophoresis (DGGE) to assess the impact of oxygen limitation and denitrification.

    • Main Results:

    • VOC removal generally increases as Henry's constant decreases, but an optimal range for biofiltration may exist.
    • For high Henry's constant VOCs (hexane, toluene), interphase mass transfer is rate-limiting.
    • For low Henry's constant VOCs (butanol), oxygen transfer can become rate-limiting, especially at high loadings; nitrate supports growth and respiration.

    Conclusions:

    • Henry's constant is a critical parameter influencing VOC biofiltration efficiency and rate-limiting steps.
    • Optimizing biofilter design and operation requires considering the specific Henry's constant of the target VOC.
    • Nitrate can be effectively utilized in aerobic biofilters for treating low Henry's constant VOCs, impacting microbial community structure and performance.