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Analytical model for BTEX natural attenuation in the presence of fuel ethanol and its anaerobic metabolite acetate.
MedLine Citation:
PMID:  23340452     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Flow-through column studies were conducted to mimic the natural attenuation of ethanol and BTEX mixtures, and to consider potential inhibitory effects of ethanol and its anaerobic metabolite acetate on BTEX biodegradation. Results were analyzed using a one-dimensional analytical model that was developed using consecutive reaction differential equations based on first-order kinetics. Decrease in pH due to acetogenesis was also modeled, using charge balance equations under CaCO(3) dissolution conditions. Delay in BTEX removal was observed and simulated in the presence of ethanol and acetate. Acetate was the major volatile fatty acid intermediate produced during anaerobic ethanol biodegradation (accounting for about 58% of the volatile fatty acid mass) as suggested by the model data fit. Acetate accumulation (up to 1.1g/L) near the source zone contributed to a pH decrease by almost one unit. The anaerobic degradation of ethanol (2g/L influent concentration) at the source zone produced methane at concentrations exceeding its solubility (≅26mg/L). Overall, this simple analytical model adequately described ethanol degradation, acetate accumulation and methane production patterns, suggesting that it could be used as a screening tool to simulate lag times in BTEX biodegradation, changes in groundwater pH and methane generation following ethanol-blended fuel releases.
Authors:
Marcio L B da Silva; Diego E Gomez; Pedro J J Alvarez
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-30
Journal Detail:
Title:  Journal of contaminant hydrology     Volume:  146C     ISSN:  1873-6009     ISO Abbreviation:  J. Contam. Hydrol.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2013-1-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8805644     Medline TA:  J Contam Hydrol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1-7     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Affiliation:
EMBRAPA, BR 153 KM 110 P.O. Box 21, Concórdia, SC 89700-000, Brazil. Electronic address: marcio.busi@embrapa.br.
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