Anaerobic-aerobic treatment of vegetable tanning waste / Michael H. Tunick in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXX (Année 1985)

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXX (Année 1985) . - p. 101-105 Titre : Anaerobic-aerobic treatment of vegetable tanning waste Type de document : texte imprimé Auteurs : Michael H. Tunick, Auteur ; David G. Bailey, Auteur ; Joanna H. Moore, Auteur ; Joseph E. Cooper, Auteur Année de publication : 1985 Article en page(s) : p. 101-105 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Vegetable tanning waste can be treated effectively on a laboratory scale by a combination of an anaerobic contact reactor followed by a complete-mix aerobic reactor. The 28.7 liter anaerobic reactor is constantly stirred and maintened at 37°C. A settling tank follows to permit sludge recycling. The aerobic reactor contains 22.6 liters of microorganisms, which are suspended by the flow of air. Waste aerobic sludge is recycled back to the anaerobic reactor for digestion. With a hydraulic retention time of 58 hr. and a loading of 2.5-5.0 g TCOD/day, an average TCDO removal of 90 percent was obtained (corrected for S). The anaerobes produced an average of 0.161 liters CH4/g TCOD removed. The CH4 can potentially be recovered and used to maintain the temperature of the anaerobic reactor. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9250 [article]

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Treatment of beamhouse effluent with an aerobic fixed-film reactor / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXVI (Année 1981) . - p. 204-215 Titre : Treatment of beamhouse effluent with an aerobic fixed-film reactor Type de document : texte imprimé Auteurs : David G. Bailey, Auteur ; Michael H. Tunick, Auteur ; A. A. Friedman, Auteur ; I. Chang, Auteur ; Joseph E. Cooper, Auteur Année de publication : 1981 Article en page(s) : p. 204-215 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An aerobic fixed-film pilot plant designed to treat high-strenght waste was evaluated for treating beamhouse effluent. Its main advantage is a low space requirement compared to other aerobic systems. Its major drawback is that it must be supplied with oxygen rather than air for full efficiency. The reactor consisted of a 6-in. ID, 8-ft-high column containing a bed of sand granules approximately 3 ft high. The waste was circulated into the column at a rate of flow that expanded the sand bed only a few inches. The aerobic organisms formed a film on the sand particles. As the density of the combined organisms ans sand grains decreased, the particles became suspended in the circulating fluid in the column. The contents of the column were recycled into a second column containing oxygen under pressure. Dissolved oxygen levels between 5 and 30 ppm were maintained in the system. Influent was added to the recycling contents of the column at a rate of 1 gal/hr. Column loading rates were changed by increasing or decreasing the strenght of the waste added. Reduction of COD increased as the recycle rate increased from 2.75 to 4.75 gal/min. At the maximum moading rate, 1,300 lb/1,000 cu ft/day, COD removals of over 72 percent were obtained. Kjeldahl nitrogen removal varied, but was generally between 50 and 75 percent. Less than 20 percent of this removal was accounted for as nitrite or nitrate present in the effluent. Sulfide removal was over 98 percent regardless of the concentration in the influent. It is assumed that the sulfide was oxidized to sulfate. Note de contenu : - Start-up - Standard conditions - Effect of recycle rate on COD removal - Solids - TKN - Sulfide - pH - Operation - Scale-up En ligne : https://drive.google.com/file/d/1MNvsMQGfCF-u_yPkJ5O-trKOq4etEGQo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17600 [article]

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