The elimination of odours resulting from a process of treatment of sewage sludge by biofiltration

• Autores: Gracy Séverine, Cécile Hort, Platel Vincent
• 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. 85-93
• Idioma: inglés
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• Resumen

  • Our study deals with the elimination of the odours resulting from a process of treatment of sewage sludge by biofiltration (composting is carried out at the factory site). The first phase consists of identifying the odorous compounds emitted at the time of the composting of these sewage sludges (GC-MS). After identification, the pollutants are directly eliminated, at the factory site, by biofiltration. A medium containing the compost of green waste and sewage sludge is tested. The physicochemical and bacteriological properties of the media packing have been determined and monitored during the process of biofiltration.

    Results show the efficiency of elimination of ammonia by the biofilter and the molar balance of sulphur was evaluated. Particular interest is given to the biological breakdown of sulphur compounds (H2S, DMDS, etc…), which are highly smelly, even at very weak concentrations. Removal of many reduced sulfur compounds is complete while others are higher outlet concentration than inlet of the biofilter. These compounds can be formed as an intermediate product in the degradation dimethylsulfide (DMS), dimethyldisulfide (DMDS) and/or methylmercaptan (Me-SH). Also, the phenomena of adsorption and desorption are important because the concentrations of sulphur compounds in the air are low and fluctuates periodically.

    One of the interests of this work is the use of a material resulting from composting which is directly available by the industrial and this process allows him to use produced waste. Moreover, this solution saves money since it allows one to obtain a process that is far from expensive, and which in addition offers the advantage of starting without any preliminary inoculation.