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Communicated by William A. Jury, University of California, Riverside, CA, April 1, 2003 (received for review November 1, 2002)
Abstract
Biological treatment is a promising alternative to conventional air-pollution control methods, but thus far biotreatment processes for odor control have always required much larger reactor volumes than chemical scrubbers. We converted an existing full-scale chemical scrubber to a biological trickling filter and showed that effective treatment of hydrogen sulfide (H2S) in the converted scrubber was possible even at gas contact times as low as 1.6 s. That is 8–20 times shorter than previous biotrickling filtration reports and comparable to usual contact times in chemical scrubbers. Significant removal of reduced sulfur compounds, ammonia, and volatile organic compounds present in traces in the air was also observed. Continuous operation for >8 months showed stable performance and robust behavior for H2S treatment, with pollutant-removal performance comparable to that achieved by using a chemical scrubber. Our study demonstrates that biotrickling filters can replace chemical scrubbers and be a safer, more economical technique for odor control.
Footnotes
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↵† To whom correspondence should be addressed. E-mail: mdeshuss{at}engr.ucr.edu.
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↵* Present address: Escola Tècnica Superior d'Enginyeria, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain.
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Abbreviations: RSC, reduced sulfur compound; ppbv, parts per billion by volume; ppmv, parts per million by volume; OCSD, Orange County Sanitation District.
- Received November 1, 2002.
- Copyright © 2003, The National Academy of Sciences
Retrofitting existing chemical scrubbers to biotrickling filters for H2S emission control
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