Thermofix thermal fixation and volume reduction of trivalent chromium-containing wastes and sludges / Bradford H. Jones in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXI (Année 1986) . - p. 322-330 Titre : Thermofix thermal fixation and volume reduction of trivalent chromium-containing wastes and sludges Type de document : texte imprimé Auteurs : Bradford H. Jones, Auteur ; Richard L. Alexander, Auteur Année de publication : 1986 Article en page(s) : p. 322-330 Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The handling and disposal of chromium containing wastes generated by leather manufacturing processes has been a major environmental issue demanding much attention, time and money. Most of these wastes are being landfilled. Sludge landfills are often controversial because the public is concerned about the generation of odors and the potential release of chromium into the environment. A more economical and environmentally acceptable alternative sludge management process, called Thermofix, has been developed by Jones&Beach Engineers, Inc. Thermofix is a pyrolytic volume reduction and heavy metal stabilization process. The resulting char residue typically weighs about 20 percent if the weight of the wastes being processed. The char residue contains the heavy metals (chromium) concentrated and tightly bound within an insoluble (hence nonleachable) carbon matrix. Extensive bench and pilot scale testing of the process has been conducted for municipal and industrial clients faced with the expensive disposal of heavy metal contamined sludges. Laboratory tests of the Thermofix products resulting from the processing of concentrated, chromium-laden wastes, have shown that leachables of the char generated by EPA's EP Extraction Procedure typically contains less that 5 percent of the allowed amounts of chromium. The resulting stabilized char residue can be stored, transported and disposed of without the risks and costs associated with handling Hazardous Wastes. The Thermofix process has taken advantage of existing technology and reliable equipment to accomplish a new goal-metal stabilization and volume reduction. The components are easily transportable, packaged units, selected with an emphasis on relatively low cost and operational flexibility. Tables present the approximate capital investment and the expected annual operations and maintenance costs. Laboratory data, including sludge bulk analysis, residue char bulk analysis, and EP Toxicity leachate concentrations demonstrate the effectiveness of the process. The future prospects of recovering the chromium from the char on a regional basis will depend on market conditions. A potential, economic incentive to recover this metal would have to offset the investment in facilities necessary for handling, storage and transportation of the stabilized Thermofix char residue. En ligne : https://drive.google.com/file/d/1bZJBg5PdiGAlZHF2uFVf_Fxb0I5cK2za/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9190 [article]

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