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Simple biogas desulfurization by microaeration - Full scale experience.

P Jeníček1, J Horejš2, L Pokorná-Krayzelová1

  • 1Department of Water Technology and Environmental Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czechia.

Anaerobe
|January 10, 2017
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Summary

Microaeration, a cost-effective biochemical method, effectively removes hydrogen sulfide from biogas. This process, involving controlled air dosing, achieved over 90% desulfurization efficiency in wastewater treatment, also enhancing biodegradability.

Keywords:
Anaerobic digestionBiogasHydrogen sulfide removalMicroaerationSludge stabilization

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Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Wastewater Treatment

Background:

  • Hydrogen sulfide (H2S) is a common biogas contaminant in wastewater treatment, particularly from high-sulfate sources like breweries and distilleries.
  • H2S removal is crucial for biogas utilization and preventing equipment corrosion.
  • Physico-chemical H2S removal methods are often energy-intensive and costly compared to biochemical alternatives.

Purpose of the Study:

  • To evaluate the efficacy and benefits of microaeration for hydrogen sulfide removal in anaerobic wastewater treatment reactors.
  • To address the limited full-scale data on microaeration in wastewater treatment plants.

Main Methods:

  • Analysis of operational data from seven full-scale microaerobic digesters in Central Europe.
  • Assessment of desulfurization efficiency and impact on Chemical Oxygen Demand (COD) and volatile suspended solids (VSS) degradation.

Main Results:

  • Microaeration consistently achieved over 90% desulfurization efficiency in most evaluated cases.
  • The microaeration process demonstrated a positive impact on the biodegradability of COD and VSS.
  • Microaeration proved to be a cost-effective biochemical method for H2S removal.

Conclusions:

  • Microaeration is a highly efficient and cost-effective biochemical strategy for removing hydrogen sulfide from biogas in wastewater treatment.
  • This method offers additional benefits by improving the overall biodegradability of organic matter in anaerobic digesters.
  • The study provides valuable full-scale data supporting the wider adoption of microaeration in wastewater treatment plants.