ISSN:
1476-5535
Keywords:
Leaching
;
Bleaching
;
Kaolin
;
Aspergillus niger
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Summary The efficiency of a biological bleaching process on a highly contaminated iron oxides kaolin was analyzed. The bio-bleaching method consists of two steps: first, the fermentation of a chemically-defined medium byAspergillus niger leads to a spent liquor which, in a second step, is employed as leaching agent for kaolin. In the leaching process 43% of iron oxides was removed when the kaolin was treated at 60°C for 5 h and the whiteness index was increased to 67%. Extracellular enzymes were not responsible for leaching, which is basically due to organic acids produced during the fermentation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01569941
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