H2S removal from wastewater treatment plants off-gases using activated sludge process

• Autores: G. R. Moosavi, K. Naddafi, A. Mesdaghinia, M. A. Deshusses
• 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, pág. 149
• Idioma: inglés
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• Resumen

  • The emission of H2S from POTWs is a serious problem so, collection and treatment of these emissions is essential. In this work, the performance of a bench scale activated sludge system in H2S removal and the effects of H2S concentrations in range of 5 to 50 ppmv on COD reduction and biomass settleability was studied. After biomass acclimation, reactor was operated in continues mode at HRT and MCRT of 5 h and 6 days, respectively. Results showed that the level of COD and H2S removal during trial course were in turn over 93.5 and 94.5%. Furthermore, H2S concentration up to 50 ppmv could not significantly affect the reactor performance in COD reduction. H2S loading rates of up to 7.5 mgH2S g-1MLSS d-1 that is lower than the toxicity threshold was handled very well. The only adverse observed effect of H2S diffusion the reactor performance was SVI increase at loading rates over 4.5 mgH2S g-1MLSS d-1, in which bulking sludge occurred. Overall, the results indicted that the H2S in concentrations emitted from wastewater treatment processes (lower than 50 ppmv), can be efficiently treated using activated sludge diffusion without compromising the performance of the process.