Anaerobic biological treatment of hazardous wastes and pollutants is playing an increasingly important role in the application of biological treatment technology. Research into the biodegradability of priority pollutants and the effect of those pollutants on the biological treatment system itself are vital to the understanding of how to economically and effectively apply the treatment system. The objectives of this research were to develop quantitative information about the fate and toxic effects of selected toxicants (2-nitrophenol, 3-nitrophenol, 4-nitrophenol, 2,4-dinitrophenol and 2,4-dichlorophenol) on an anaerobic propionate enrichment system and to study the usefulness of monitoring the headspace gases hydrogen and carbon monoxide as predictors and indicators of toxicity. Batch anaerobic toxicity assays (ATA) were performed with serum bottles to study the fate and effects of the selected nitrophenols and chlorophenols. Chemostats were operated at 10-, 16- and 30-day solids retention times (SRT) to study the fate and effects of 4-nitrophenol. The toxicity of the nitrophenols and chlorophenol studied in this research decreased in the following order: 2,4-dinitrophenol, 2,4-dichlorophenol, 4-nitrophenol, 2-nitrophenol and 3-nitrophenol. There is less inhibition of systems at 30-day SRT as compared to the systems at 10-day SRT with 4-Np up to 33 mg/l. The toxicity effect of 4-nitrophenol on the culture is primarily the inhibition of the propionate utilizers. The hydrogen utilizers were not affected and the effects on the acetate utilizers were masked. The 4-nitrophenol removal due to chemical transformation and sorption is about 12%, and since volatilization of 4-nitrophenol is negligible, at least 83% of 4-nitrophenol removal could be due to biodegradation. Hydrogen and carbon monoxide are not useful as parameters for prediction or monitoring inhibition of HPr degradation by 4-nitrophenol in propionate systems / acase@tulane.edu
| Identifer | oai:union.ndltd.org:TULANE/oai:http://digitallibrary.tulane.edu/:tulane_26374 |
| Date | January 1994 |
| Contributors | Sluder, Jerald Lewis, Jr (Author), Bhattacharya, Sanjoy K (Thesis advisor) |
| Publisher | Tulane University |
| Source Sets | Tulane University |
| Language | English |
| Detected Language | English |
| Rights | Access requires a license to the Dissertations and Theses (ProQuest) database., Copyright is in accordance with U.S. Copyright law |
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