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  • 1
    Electronic Resource
    Electronic Resource
    Bradford : Emerald
    World class design to manufacture 1 (1994), S. 15-22 
    ISSN: 1352-3074
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: National governments, international conferences, some industryassociations, and a number of individual companies are increasinglyemphasizing the need for a company to take responsibility both for theenvironmental consequences of its production and for the ultimatedisposal or the products it produces. As a result companies areincreasingly challenged - by competitors, government regulation,public pressure, or good conscience - to improve and manage theirprocesses and products from both an environmental and an economicstandpoint. To be effective, these efforts, to the extent possible, needto address the energy uses and materials flows related to the entirecycle of production, consumption and ultimate disposition. Rules ofthumb for environmentally-conscious manufacturing include improvingefficiency and productivity through efficient energy and materials use,substituting more abundant and environmentally preferable materials forthose that are rare or environmentally problematic; as well assrecycling and reusing products at the ends of their lives. Expounds onsome of the challenges in integrating environmental considerations indesign.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 33 (1989), S. 32-38 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The anoxic-oxic activated-sludge process has been evaluated in a laboratory investigation as a means for effective treatment of cyanide-laden wastewaters, with phenols used as the organic carbon sources for denitrification reactions. The performance of the process was evaluated at different levels of feed cyanide concentration and mean cell residence time (MCRT). The results obtained indicate that the phenolic compounds used can be effectively used as the organic carbon sources to promote denitrification reactions. The effects of cyanide inhibition on overall TOC removal can be alleviated at longer MCRTs. Between 1.2 and 2.2 g TOC can be utilized per gram NO2 + NO3- -N removed in the anoxic chamber depending on the prevailing MCRT. Microbial oxidation of cyanide and thiocyanate which yields ammonia is the main mechanism responsible for the removal of cyanide and thiocyanate observed in the anoxic-oxic activated-sludge process. Excellent removal efficiencies have been observed with feed concentrations up to 60 mg CN-/L and 100 mg SCN-/L Frequent exposure of autotrophic and aerobic cyanideutilizing microbes does not impede their activities in the oxic environment. Good nitrification and denitrification efficiencies are attainable in the anoxic-oxic activated-sludge process in the presence of high feed cyanide and thiocyanate concentrations, provided that MCRT is maintained at a desirable level. As a result, the microbial degradation of cyanide and thiocyanate in conjunction with nitrification and denitrification to produce innocuous nitrogen gas is feasible in the anoxic-oxic activated-sludge process.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 1986-09-01
    Print ISSN: 0043-1354
    Electronic ISSN: 1879-2448
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Elsevier
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  • 4
    Publication Date: 1999-01-01
    Print ISSN: 1088-1913
    Electronic ISSN: 1520-6483
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Economics
    Published by Wiley
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  • 5
    Publication Date: 1999-01-01
    Print ISSN: 1088-1913
    Electronic ISSN: 1520-6483
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Economics
    Published by Wiley
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