Biodegradation of leather solid waste and manipulation of methanogens and chromium-resistant microorganisms / Caroline Borges Agustini in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 1 (01/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 1 (01/2017) . - p. 7-15 Titre : Biodegradation of leather solid waste and manipulation of methanogens and chromium-resistant microorganisms Type de document : texte imprimé Auteurs : Caroline Borges Agustini, Auteur ; Wolmir Lourenço Neto, Auteur ; Guilherme P. S. Priebe, Auteur ; Marisa Costa, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2017 Article en page(s) : p. 7-15 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biogaz Cuirs et peaux -- Biodégradation Cuirs et peaux -- Déchets -- Recyclage Déchets -- Valorisation Déchets industriels -- Recyclage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The final solid wastes generated by tanneries are usually separately disposed of in hazardous industrial landfills, which are characterized as places of waste confinement where the residues undergo undesired and uncontrolled biological treatment. The storage and corresponding evolution of the sludge has not yet focalized the attention of the scientific community. Apart from developing knowledge of the ecology and function of the microbial community in anaerobic digestion processes, it is necessary to control this biological process. The manipulation of strict anaerobic microorganisms is the limiting factor in their isolation due to their high sensitivity to oxygen; therefore, cultivation under anaerobic conditions is essential. This work presents an evaluation of biogas generation and quality. In addition, microbial biodegradation is carried out in bench bioreactors containing two main solid wastes from tanneries: wet-blue shavings and sludge from a tannery wastewater treatment plant (WWTP). We analyzed two storage conditions of the sludge: storage under ambient conditions and under refrigeration. Sludge kept at ambient conditions showed a significantly higher methane production; methane was only detected in vials containing high concentrations of microorganisms. The manipulation of microorganisms did not interrupt biodegradation. The isolation technique with vials proved to be appropriate for the quantification of methanogenic microorganisms in biodegradation tests, although it was not fully elucidated for their isolation. Note de contenu : - MATERIALS AND METHODS : Bioreactor assembling - Biogas composition monitoring - Statistical analysis - Microbial collection and analysis - RESULTS AND DISCUSSION : Biogas and methane production - Statistical results - Microbiological results En ligne : https://drive.google.com/file/d/1sceXbIkeqzbHiY58k_0kIs9K846GK9kC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27564 [article]

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Lack of inhibitory effect of chromium on anaerobic co-digestion of tannery solid wastes / Caroline Borges Agustini in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 6 (11-12/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 6 (11-12/2017) . - p. 303-307 Titre : Lack of inhibitory effect of chromium on anaerobic co-digestion of tannery solid wastes Type de document : texte imprimé Auteurs : Caroline Borges Agustini, Auteur ; Amanda L. Jasper, Auteur ; Marisa Costa, Auteur ; Mariliz Gutterres, Auteur Année de publication : 2017 Article en page(s) : p. 303-307 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biogaz Boues d'épuration -- Recyclage Déchets industriels -- Recyclage Digestion anaérobie Recyclage (déchets, etc.) Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Large amounts of shavings and sludge are generated from wastewater treatment plants of tanneries and are of great concern since their must common destination is their disposal in landfills. ln tanning processes chromium salts are the main tanning agents used. The tannery solid residues characteristics suggest that anaerobic digestion is a potential treatment alternative. Therefore this study aimed to analyze the influence of the presence of chromium in the co-digestion of these two leather industry solid residues of major concern both before and after the tanning stage. The presence of chromium in sludge proved to be more suitable than its absence, producing more biogas — 30.34mI/g of VSS (volatile suspended solids) on average — and a greater reduction of organic load 67.7% on average. This may be due to the low concentration of chromium in essays (up to 15mg/L.) being appropriate for rnany enzymes and co-enzymes in addition to the possible toxicity of the reagents used in the beamhouse process, such as acids and bases, which inhibited the final steps of the anaerobic digestion. The presence of chromium in shavings did not show significant influence probably due to their small proportion in essays. Note de contenu : - Table 1. Essays of 22 factorial design performed in duplicate - Table 2. Chromium concentration in wastes. Waste chromium concentration - Table 3. Final methane percentage by biodigestion essays - Fig. 1 Concentration of chromium in essays before and after biodegradation - Fig. 2. Biogas cumulative generation in the biodegradation essays of mixtures of the tannery wastes : sludge and shavings - Fig. 3. Biological oxygen demand in essays before and after biodegradation En ligne : https://drive.google.com/file/d/19QwjKz4SxPiODVJZesv2Pb8CKONqilE6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29669 [article]

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