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|Title:||Hybrid-hollow-fiber membrane bioreactor for cometabolic transformation of 4-chlorophenol in the presence of phenol|
|Citation:||Li, Y., Loh, K.-C. (2007). Hybrid-hollow-fiber membrane bioreactor for cometabolic transformation of 4-chlorophenol in the presence of phenol. Journal of Environmental Engineering 133 (4) : 404-410. ScholarBank@NUS Repository. https://doi.org/10.1061/(ASCE)0733-9372(2007)133:4(404)|
|Abstract:||Hybrid-hollow-fiber membrane bioreactors were developed for the enhanced cometabolic biotransformation of phenol and 4-chlorophenol (4-cp) by Pseudomonas putida ATCC49451. Bioreactor performance was investigated, compared, and analyzed under batch and continuous operating modes. The spinning solutions contained polysulfone (PS), N -methyl-2-pyrrolidone, and various weight ratios of granular activated carbon (GAC) (GAC: PS of 0, 1:4, and 1:2). The bioreactor fabricated with 1:2 GAC hybrid-hollow-fiber membranes demonstrated the best performance for the removal of phenol and 4-cp, both under batch and continuous operations. Under batch operation, 500 mg L-1 phenol and 4-cp were completely removed within 23 h in the bioreactor, compared with 26 and 30 h for the 1:4 GAC and GAC free bioreactors. Sorption, biotransformation, desorption, and bioregeneration were identified as the four steps for substrate removal during batch operation. The 1:2 GAC hollow-fiber membrane bioreactor also manifested superiority over the other two during continuous operation for start up and the transient phase after shock loadings of the feed. 300 mg L-1 phenol and 4-cp were completely removed in the 1:2 GAC hybrid-hollow-fiber membrane bioreactor whereas 4-cp was not completely removed in the other two bioreactors at a feed rate of 30 mL h-1. From the experimental results, it was inferred that at steady state, biotransformation was achieved through the dynamic equilibrium among sorption, desorption, and biotransformation rates established within the bioreactors. © 2007 ASCE.|
|Source Title:||Journal of Environmental Engineering|
|Appears in Collections:||Staff Publications|
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