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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/5FE40C2E-C430-4354-90D1-3A6CFF21E1C2 | ||
| Year | 2006 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | P. Gikas and P. Romanos, "Effects of tri-valent (Cr(III)) and hexa-valent (Cr(VI)) chromium on the growth of activated sludge", J. Hazard. Mater., vol. 133, no. 1-3, pp. 212-217, May 2006. doi:10.1016/j.jhazmat.2005.10.023 https://doi.org/10.1016/j.jhazmat.2005.10.023 | ||
| Appears in Collections |
The effects of Cr(VI) and Cr(III) species on the activated sludge growth rate have been assessed for a batch growth system, for a range of chromium concentration between 0 and 320 mg l−1. Cr(VI) was found to stimulate microbial growth for concentrations up to about 25 mg l−1, exhibiting maximum growth stimulation at 10 mg l−1, whilst the lethal dose was found to be between 80 and 160 mg l−1. On the other hand, Cr(III) was also found to stimulate microbial growth for concentrations up to about 15 mg l−1, (with a maximum stimulation concentration at 10 mg l−1), whilst the lethal dose was found to lie between 160 and 320 mg l−1. The results indicate that Cr(VI) is more toxic to biomass at relatively high concentrations (higher than 70 mg l−1) whilst it has a more pronounced growth stimulation effect at relatively smaller concentrations (less than 25 mg l−1), compared with Cr(III).
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