Journal
BIORESOURCE TECHNOLOGY
Volume 100, Issue 7, Pages 2198-2203Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2008.10.036
Keywords
Biotransformation; Stabilization; Chromium; Composting; Phytoremediated biomass
Funding
- Council of Scientific and Industrial Research (CSIR), New Delhi, India
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Tannery effluent treated with aquatic macrophyte Vallisneria spiralis L. for 14 d showed significant improvement in physico-chemical properties and reduction in Cr concentration. Accumulation of Cr was found maximum in roots (358 mu g g(-1) dw) as compared to shoot (62 mu g g(-1) dw) of the plant. A laboratory scale composter was designed with the objectives to investigate the physico-chemical changes and role of microbes in stabilization and transformation of Cr in the composting material. Results revealed that the composting process was quick within 7-21 d as indicated by peak time for various physico-chemical parameters and drop in C/N ratio up to acceptable limit. The profile of microbial communities indicated that population of anaerobic, aerobic and nitrifying bacteria increased quickly at the initial phase, and reached a peak level of 4.2 x 10(6), 9.78 x 10(8) and 9.32 x 10(9) CFU g(-1), respectively at 21 d: while population of actinomycetes and fungi was found maximum i.e. 3.29 x 10(7) and 9.7 x 10(6) CFLJ g(-1), respectively, after 35 d of composting. Overall bacterial population dominated over the actinomycetes and fungi during the composting process. Cr-(VI) was transformed to Cr-(III) due to the microbial activity during the process. Sequential extraction of Cr fractionation showed its stabilization via changing into organic matter-bound and residual fractions during the composting. (C) 2008 Elsevier Ltd. All rights reserved.
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