Performance evaluation of biofiltration in the removal of hydrogen sulfide from gas flue

• Autores: Babak Roshani, Ayoob Torkian, Reza Dehghanzadeh, Mohammad Reza Shahmansori
• Localización: Biotechniques for air pollution control: proceedings of the international congress Biotechniques for Air Pollution Control : A Coruña, Spain, October 5-7, 2005 / Christian Kennes (dir. congr.), María C. Veiga (dir. congr.), 2005, ISBN 84-9749-163-7, págs. 119-126
• Idioma: inglés
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• Resumen

  • Hydrogen sulfide, the most common odorous reduced sulfur compound, has an odour threshold of 1-2 ppb and is emitted from variety of industrial air emissions. Many traditional technologies for H2S treatment have already been developed. However, these technologies are expensive for treating dilute streams and consume more energy and generate secondary pollution. Biofiltration is a low-cost and highly effective air pollution control technology and an environmental amicable method. Performance of biofiltration for removal of hydrogen sulfide from waste gas stream was studied in a bench scale biofilter constructed from galvanized iron with inner diameter of 8 cm and height of 1.20 m. Bed material consisted mixture of municipal solid waste compost and PVC bits (1.0×1.5 cm) as a bulking agent in 1:1 volumetric ratio. Parameters that were evaluated included; elimination capacity, removal efficiency, effects of sulfate accumulation, gas retention time, pressure drop, bed water content and pH. Average removal efficiency of 98% obtained with retention time of 1.0 min. Accumulation of sulfate in the bed material showed reverse effect on biofilter efficiency and resulted increasing of pressure drop along biofilter column to the maximum level of 18 mm H2O. Maximum elimination capacity of the biofilter was obtained about 22 g-s/m3.hr during the experiment.