Biodegradation of Chlorinated and Non-chlorinated VOCs from Pharmaceutical Industries.
Summary of "Biodegradation of Chlorinated and Non-chlorinated VOCs from Pharmaceutical Industries."
Biodegradation studies were conducted for major organic solvents such as methanol, ethanol, isopropanol, acetone, acetonitrile, toluene, chloroform, and carbon tetrachloride commonly used in pharmaceutical industries. Various microbial isolates were enriched and screened for their biodegradation potential. An aerobic mixed culture that had been previously enriched for biodegradation of mixed pesticides was found to be the most effective. All the organic solvents except chloroform and carbon tetrachloride were consumed as primary substrates by this mixed culture. Biodegradation rates of methanol, ethanol, isopropanol, acetone, acetonitrile, and toluene were measured individually in batch systems. Haldane model was found to best fit the kinetics of biodegradation. Biokinetic parameters estimated from single-substrate experiments were utilized to simulate the kinetics of biodegradation of mixture of substrates. Among the various models available for simulating the kinetics of biodegradation of multi-substrate systems, competitive inhibition model performed the best. Performance of the models was evaluated statistically using the dimensionless modified coefficient of efficiency (E). This model was used for simulating the kinetics of biodegradation in binary, ternary, and quaternary substrate systems. This study also reports batch experiments on co-metabolic biodegradation of chloroform, with acetone and toluene as primary substrates. The Haldane model, modified for inhibition due to chloroform, could satisfactorily predict the biodegradation of primary substrate, chloroform, and the microbial growth.
Affiliation
Environmental and Water Resources Engineering Division, Department of Civil Engineering, IIT Madras, Chennai, 600 036, India.
Journal Details
This article was published in the following journal.
Name: Applied biochemistry and biotechnology
ISSN: 1559-0291
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20799072
- DOI: http://dx.doi.org/10.1007/s12010-010-9057-2
Medical and Biotech [MESH] Definitions
Aroclors
Industrial chemicals which have become widespread environmental pollutants. Each aroclor is a mixture of chlorinated biphenyls (1200 series) or chlorinated terphenyls (5400 series) or a combination of both (4400 series).
Dicamba
A chlorinated organic herbicide.
Propanil
A chlorinated anilide that is used as an herbicide.
Hydrocarbons, Chlorinated
Hydrocarbon compounds with one or more of the hydrogens replaced by CHLORINE.
Cloxacillin
A semi-synthetic antibiotic that is a chlorinated derivative of OXACILLIN.
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