Abstract
Nitrobenzene was completely degraded by mixed cultures using a sequential anaerobic-aerobic treatment process. Under anaerobic conditions in a fixed-bed column aniline was formed from nitrobenzene through gratuitous reduction by cells of sewage sludge. This reaction was accelerated by the addition of glucose. Complete mineralization of aniline was accomplished by subsequent aerobic treatment using activated sludge as inoculum. The maximum degradation rate of nitrobenzene (4.5 mM) in the two-stage system was 552 mg l−1d−1, referring to 154 mg of nitrobenzene per gram of glucose. In a second experimental phase glucose as cosubstrate and H-donor was replaced by synthetic waste containing ethanol, methanol, isopropanol and acetone. Again, nitrobenzene (1.9 mM) was completely degraded (maximum degradation rate of 237 mg l−d−1, referring to 251 mg per gram of solvents). The major advantage of the described two-stage process is that the reduction of nitrobenzene by anaerobic pretreatment drastically reduces emission by stripping during aerobic treatment.
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Abbreviations
- HRT:
-
hydraulic retention time
- OD546 :
-
optical density at 546 nm
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Dickel, O., Haug, W. & Knackmuss, HJ. Biodegradation of nitrobenzene by a sequential anaerobic-aerobic process. Biodegradation 4, 187–194 (1993). https://doi.org/10.1007/BF00695121
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DOI: https://doi.org/10.1007/BF00695121