Abstract
AbstractA hollow fiber membrane bioreactor (HFMB) was employed for aqueous-organic two-phase biodegradation of phenol using Pseudomonas putida ATCC 11172, and the results were compared with that in a two-phase partitioning bioreactor (TPPB). Phenol containing 2-undecanone was nondispersively contacted with mineral medium that was inoculated with the bacteria. P. putida in suspension was able to biodegrade inhibitory phenol concentrations at 600–2,000 mg/L without experiencing severe substrate inhibition. For example, 1,000 mg/L phenol was completely biodegraded in 46 h at a maximum specific growth rate of 0.49 h−1, whereas the biomass yield and average biodegradation rate were 0.36 g/g and 62 mg/L·h, respectively. Biomass yield and maximum specific growth rate decreased concomitantly with increasing phenol concentration. Phenol removal started at an exponential rate, and subsequently attained a linear profile in nutrient-limited conditions. Unlike conventional two-phase biodegradation systems, HFMB o...
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