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Related Experiment Videos

Potential biogas scrubbing using a high rate pond.

G Mandeno1, R Craggs, C Tanner

  • 1School of Geography and Environmental Science, University of Auckland, Private Bag 92019, Auckland, New Zealand. geoffmandeno@hotmail.com

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|August 24, 2005
PubMed
Summary

A counter-current pit effectively scrubs carbon dioxide from biogas in high rate ponds (HRPs), reducing levels from 40% to below 5%. This purification method is safe and shows promise for wastewater treatment systems.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Biogas Purification

Background:

  • Biogas, a byproduct of anaerobic digestion, requires purification to remove components like carbon dioxide.
  • High rate ponds (HRPs) are advanced systems for wastewater treatment that can potentially integrate biogas scrubbing.
  • Efficient gas-liquid contact is crucial for effective biogas scrubbing.

Purpose of the Study:

  • To evaluate the potential of using a high rate pond (HRP) for biogas scrubbing.
  • To compare the efficacy of an "in-pond angled gutter" versus a simulated "counter-current pit" for carbon dioxide removal from synthetic biogas.
  • To assess the safety of biogas scrubbing in HRPs regarding oxygen transfer and potential explosive mixtures.

Main Methods:

  • Designed apparatus to maximize gas-liquid contact for biogas scrubbing experiments.

Related Experiment Videos

  • Compared carbon dioxide removal efficiency between an in-pond angled gutter and a counter-current pit using synthetic biogas.
  • Measured oxygen levels in scrubbed biogas to evaluate safety concerning methane/oxygen mixtures.
  • Performed theoretical calculations to predict the impact of biogas scrubbing on HRP performance.

    • Main Results:

    • The counter-current pit demonstrated significant potential, reducing synthetic biogas carbon dioxide from 40% to below 5%.
    • The in-pond angled gutter was less effective due to bubble coalescence, limiting gas transfer surface area.
    • Minimal oxygen transfer to the scrubbed biogas was observed, preventing the formation of explosive methane/oxygen mixtures.
    • Theoretical analysis suggested that biogas scrubbing in HRPs would have negligible effects on pH, algal growth, and overall treatment performance.

    Conclusions:

    • The counter-current pit is a promising technology for biogas purification within high rate pond systems.
    • Biogas scrubbing in HRPs appears to be a safe and viable method for purifying biogas from municipal wastewater treatment.
    • Further research is warranted to optimize and implement this biogas purification technique in full-scale advanced pond systems.