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Comparison of efficiencies and costs of chromium recovery methods / Hikmet Toprak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 11 (11/1994)
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Titre : Comparison of efficiencies and costs of chromium recovery methods Type de document : texte imprimé Auteurs : Hikmet Toprak, Auteur Année de publication : 1994 Article en page(s) : p. 339-351 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Conventional physical-chemical treatment of tanning effluent consists of pre-treatment and dosing with coagulants and flocculants, followed by sedimentation and sludge handling and disposal. It is economically feasible to recover spent chromium in the sludge to reuse in the tanning process. Chromium can be recovered from wastewater treatment sludges by incineration at 600°C for 5 hr or by acid leaching. The chromium containing sludge is incinerated in a high-rate reator and the chromium is the ash, as CrO4-2, is leached with HNO3. Then, the resulting solution is filtered and reduced adding H2SO4 and sugar. Some acids, such as citric, oxalic, acetic, nitric and sulfuric, are effective chelating agents for the recovery of trivalent chromium from the sludge. The extracted Cr+3 solutions have tanning properties. In this study, chromium was recovered from sludges of "gökdere tannery wastewater treatment plant" using both methods and the recovery efficiencies and costs were compared. En ligne : https://drive.google.com/file/d/1zz4ssnc-R5RViJ6i8oT_QQBcJWcbYcAJ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8034
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIX, N° 11 (11/1994) . - p. 339-351[article]Réservation
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