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|Title:||Enhanced cometabolic transformation of 4-chlorophenol in the presence of phenol by granular activated carbon adsorption|
|Authors:||Loh, K.-C. |
Granular activated carbon
|Citation:||Loh, K.-C.,Wang, Y. (2006-04). Enhanced cometabolic transformation of 4-chlorophenol in the presence of phenol by granular activated carbon adsorption. Canadian Journal of Chemical Engineering 84 (2) : 248-255. ScholarBank@NUS Repository.|
|Abstract:||Substrate inhibitions that manifest within the cometabolism system of 4-chlorophenol (4-cp) and phenol were alleviated through the application of granular activated carbon (GAC) in batch biodegradation. It was found that 4-cp was preferentially adsorbed over phenol by the GAC and that 50% to 70% of the adsorption was achieved within the first two hours of contact. The kinetics of 4-cp adsorption was also much faster than that of phenol, even when the co-existing phenol was of a significantly higher initial concentration. As a result, competitive inhibition between the two compounds was minimized. Adsorption also caused a lowering of the phenol concentration in solution with a concomitant reduction in the substrate inhibition effect on cell growth. The addition of GAC benefited the biotransformation process through shortening the total degradation time for 600 mg L-1 phenol and 100 mg L -1 4-cp from 42 h to 12 h; And it also made it possible for cells to survive and transform 600 mg L-1 phenol and as high as 400 mg L -1 4-cp in free suspension cultures. Repeated operations in which GAC was reused showed that GAC could be regenerated by the cells, thus rendering the GAC incorporated process amenable to long term operations.|
|Source Title:||Canadian Journal of Chemical Engineering|
|Appears in Collections:||Staff Publications|
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