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Le Mans, France

Anet B.,Atemax France | Anet B.,National Graduate School of Chemistry, Rennes | Anet B.,University of Southern Brittany | Lemasle M.,National Graduate School of Chemistry, Rennes | And 16 more authors.
Journal of Environmental Management | Year: 2013

This research focuses on the identification and quantification of odorous components in rendering plant emissions by GC/MS and other analytical methods, as well as the description of phenomena occurring in biofilter in order to improve the removal efficiency of industrial biofilters.Among the 36 compounds quantified in the process air stream, methanethiol, isopentanal and hydrogen sulfide, presented the major odorous contributions according to their high concentrations, generally higher than 10mgm-3, and their low odorous detection thresholds. The elimination of such component mixtures by biofiltration (Peat packing material, EBRT: 113s) was investigated and revealed that more than 83% of hydrogen sulfide and isopentanal were removed by biofilter. Nevertheless, the incomplete degradation of such easily degradable pollutants suggested inappropriate conditions as lack of nutrients and acidic pH. These inadequate conditions could explain the lack of performance, especially observed on methanethiol (53% of RE) and the production of oxygenated and sulfur by-products by the biofilter itself. © 2013. Source

Akiolis Group | Date: 2013-10-25

Foodstuffs for animals; edible oils and fats for animals.

Akiolis Group | Date: 2013-10-25

Foodstuffs for animals.

Aneta B.,Atemax Ouest | Aneta B.,National Graduate School of Chemistry, Rennes | Couriol C.,Akiolis Group | Couriol C.,CNRS Chemistry Institute of Rennes | And 8 more authors.
Chemical Engineering Transactions | Year: 2012

In this paper, the performances of three industrial biofilters treating rendering odorous emissions and the packing material evolution are presented and discussed. The biofilters were packed with a mixture of peat and heather, treating about 50 000 m3.h-1 of rendering gases which presented typical odorous concentrations ranging from 1 350 to 22 000 OU.m -3 for ambient air from industrial facilities, and from 13 000 to 184 000 for processes gas (mixture of non-condensable and air from fat presses). During the two first months of running, the packing material has shown a rapid compaction of 30 to 40 cm, representing a 20 to 26.7 % reduction of the volume. pH of biofilters were compared to new material, showing a drastic acidification in the deeper part. The bacterial count on PCA medium showed that bacterial density depends on the packing pH, which also induces a selection of micro-organism species. The low colonization (inferior to 9.4x104 CFU.g-1) can be explained by the lack of inoculation at biofilter start-up, the lack of nutrients supply and by acidic pH. Copyright © 2012, AIDIC Servizi S.r.l. Source

Jaber M.B.,National Graduate School of Chemistry, Rennes | Jaber M.B.,European University of Brittany | Anet B.,Akiolis Group | Amrane A.,National Graduate School of Chemistry, Rennes | And 8 more authors.
Chemical Engineering Journal | Year: 2014

The treatment of sulfur odorous compounds in mixture, hydrogen sulfide (H2S), dimethyl disulfide (DMDS) and ethanethiol (EtSH), by biofiltration was examined. A significant effort was focused on the impact of nutrients supply, without forgetting the effect of other parameters such as the pH, on the process performances. Removal efficiencies of three biofilters packed with pine bark and composted wood mulch and sprinkled by different nutritive solutions were compared.Owing to the biodegradability of H2S, its removal was not affected by the lack of nutrients in the biofilter. However, for EtSH and DMDS, considered as more recalcitrant, the influence of nutrients on biodegradation was clearly observed; it was enhanced when the supplementation in the watering solution was increased. Furthermore, EtSH removal yield increased from 80% in the absence of supplementation to an almost total removal in the presence of nutrients in the watering solution. The degradation of the three compounds decreased as follows: H2S>DMDS>EtSH. The impact of the pH of the packing materials was also underlined. The decrease in pH caused by the accumulation of sulfuric acid in the packing material, the most abundant product of the biological oxidation of sulfur compounds, led to a reduction of the elimination efficiencies of EtSH and DMDS; while the microorganisms involved in H2S degradation appeared active in a large pH range, from less than 3 to close to 9. © 2014 Elsevier B.V. Source

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