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| Biodegradation of nitrobenzene by a strain immobilized on granular activated carbon. |
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Abstract Effects of nitrobenzene biodegradation enhanced by Pseudomonas putida immobilized on granular activated carbon (GAC) was studied. The biodegradation time was shortened for 200mg/L nitrobenzene from approximately 34h to 29.5h with biological activated carbon (BAC) present. Nitrobenzene with concentration at 400mg/L could not been directly biotransformed by the bacteria due to the intense inhibition before the bacteria was immobilized within GAC. However, nitrobenzene at the same concentration was biodegraded in 46h by the BAC. In addition, BAC was reused for nitrobenzene biodegradation for 4 times with a slowly decreased degradation efficiency. At the end of biodegradation, the BAC at the final stage of 200mg/L nitrobenzene degradation was scanned by SEM. And Pseudomonas putida was the only bacteria effective for the biodegradation.
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Received: 04 January 2009
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