Journal
JOURNAL OF ENVIRONMENTAL ENGINEERING AND SCIENCE
Volume 7, Issue 5, Pages 543-552Publisher
NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS
DOI: 10.1139/S08-023
Keywords
anaerobic; anoxic; biofiltration; biogas; biotrickling filter; denitrification; hydrogen sulphide
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Funding
- Natural Resources Canada's Decentralized Energy Production Initiative, Environment Canada
- Natural Sciences and Engineering Research Council of Canada
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A biological process for the removal of hydrogen sulphide (H2S) in digester biogas was investigated using nitrified municipal wastewater as a nutrient solution under anoxic conditions. Biogas was continuously fed into a 0.012am(3) biotrickling filter at an H2S loading rate of approximately 1.50ag/d, counter-current to the nutrient solution. A zero-order macro-kinetic process was established on the basis of the degradation and formation rates for N and S species. The process performance was dependent on the presence of nitrate at low concentrations (in the order of 20amg N-NO3-/L) found to be sufficient to maintain maximum H2S removal efficiency (> 99%) under steady-state conditions where nitrate degradation rate was constant. The developed process has the potential to be adopted as an attractive alternative for biogas cleaning and, in some cases, with simultaneous wastewater denitrification. The information contained within this paper may be used as a basis for further research and (or) in the design of a scaled-up process.
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