Phenol biodegradation in hybrid hollow-fiber membrane bioreactors |
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Authors: | Yi Li Chao Wang |
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Affiliation: | (1) State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Xikang Road #1, Nanjing, 210098, P.R. China;(2) Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environmental Science and Engineering, Hohai University, Xikang Road #1, Nanjing, 210098, P.R. China |
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Abstract: | Hollow-fiber membrane bioreactors were developed with granular activated carbon (GAC) for the biodegradation of phenol using Pseudomonas putida. Hollow fibers showed similar structure with/without GAC incorporated; while GAC hollow fiber had a stronger phenol adsorption capacity. In batch biotransformation experiments, complete depletion of 1000 mg phenol l−1 (at which concentration free cells cannot grow) was accomplished in the reactor within 18 h in the hybrid bioreactor, comparing with 23 h in the GAC free bioreactor. Desorption and bioregeneration of the hollow-fiber membrane were believed to be the key for the enhancement of bioreactor performance. At continuous running, the GAC bioreactor showed its superiority over the GAC free bioreactor during start-up and elevated loading phase. More than 90% of the phenol was transformed in the GAC bioreactor when the phenol loading was <24 mg h−1. The better bioreactor performance may be due to the enhanced mass transportation and adsorption capacity with the incorporation of GAC. |
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Keywords: | Granular activated carbon Hybrid hollow-fiber membrane Phenol biodegradation Pseudomonas putida Reactor operation |
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