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Microbially-influenced degradation of solidified/stabilized metal waste

IR@NEERI: National Environment Engineering Research Institute

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Title Microbially-influenced degradation of solidified/stabilized metal waste
 
Creator Sophia, Carmalin A
Swaminathan, K
Sandhya, S
 
Subject Solid and Hazardous Wastes
Solid Waste Characterization
Solid Waste Treatment & Disposal
Environmental Pollution
Biochemistry
Microbiology
 
Description In the present study, a refined microbially-influenced degradation method was used to evaluate the stability of a solidified synthetic waste containing chromium salt, cement and fly ash in two different proportions. The experimental samples showed evidence of microbial growth by leaching of sulfate. Chromium leached by Thiobacillus thiooxidans from the experimental samples ‘C1’ (10.26% CrCl3 Æ6H2O; 89.74% cement) and ‘FC1’ (10.26% CrCl3 Æ6H2O; 10% fly ash; 79.74% cement), after 30 days of exposure was 14.53 mg/g and 9.53 mg/g, respectively. The corresponding concentration of chromium in the leachate was 0.189 mg/l and 0.124 mg/l, respectively, which was lower than the toxicity characteristic leaching procedure (TCLP), regulatory limit (5 mg/l). Replacement of cement by 10% fly ash in FC1 restricted the leaching of chromium more effectively. Model equations based on two shrinking core models namely, acid dissolution and bulk diffusion model, were used to analyze the kinetics of microbial degradation. Of the two approaches, the bulk diffusion model fit the data better than the acid dissolution model as indicated by the correlation coefficients of >0.97.
 
Publisher Elsevier
 
Date 2007-09
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/435/1/bio_res_sophia.pdf
Sophia, Carmalin A and Swaminathan, K and Sandhya, S (2007) Microbially-influenced degradation of solidified/stabilized metal waste. Bioresource Technology, 98 (13). pp. 2562-2567. ISSN 0960-8524
 
Relation http://www.sciencedirect.com/science/article/pii/S0960852406005013
http://neeri.csircentral.net/435/