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Fate and biodegradability of sulfonated aromatic amines
Nico C G Tan1, Annemarie van Leeuwen, Ellen M van Voorthuizen
1Department of Agrotechnology and Food Sciences, Laboratory of Microbiology, Wageningen University & Research Center, Hesselink van Suchtelenweg 4, 6703 CT Wageningen, The Netherlands. nico.tan@wur.nl
Biodegradation
|May 4, 2005
Summary
Two aminobenzenesulfonic acid (ABS) isomers showed aerobic biodegradation in specific environments. These sulfonated aromatic amines may not be effectively removed by standard wastewater treatment processes.
Area of Science:
- Environmental microbiology
- Bioremediation
- Chemical engineering
Background:
- Sulfonated aromatic amines are widely used industrial chemicals.
- Their environmental persistence and biodegradability are not well understood.
- Assessing their fate in wastewater treatment is crucial.
Purpose of the Study:
- To evaluate the aerobic and anaerobic biodegradability of ten sulfonated aromatic amines.
- To determine the toxicity potential of these compounds.
- To investigate their removal efficiency in biological wastewater treatment.
Main Methods:
- Aerobic and anaerobic batch degradation experiments using various environmental inocula.
- Bioreactor experiments with non-sterile synthetic wastewater.
- Bioaugmentation with enrichment cultures for long-term continuous experiments.
- Measurement of oxygen uptake, carbon dioxide production, chemical oxygen demand (COD) removal, and sulfate recovery.
Main Results:
- Only 2- and 4-aminobenzenesulfonic acid (ABS) isomers were degraded.
- Degradation occurred solely under aerobic conditions with historically polluted inocula.
- Effective degradation rates (1.6-1.8 g L⁻¹ d⁻¹) were achieved in bioaugmented aerobic bioreactors.
- Extensive mineralization, including the sulfonate group, was confirmed.
- No significant toxicity was observed towards tested bacterial populations.
Conclusions:
- Specific ABS isomers can be biodegraded under optimized aerobic conditions.
- The limited biodegradability suggests poor removal in conventional wastewater treatment.
- Further research into specialized bioremediation strategies is warranted.