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Hydrodynamics and mass transfer in a novel multi-airlifting membrane bioreactor

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Title:Hydrodynamics and mass transfer in a novel multi-airlifting membrane bioreactor
Authors:Xu, Zhe
Date Issued:2007
Abstract:Nowadays, in order to relieve the environmental burden, more and more concerns are concentrated on how to maximally dispose the industrial organic waste. Meanwhile, it is expected to find a solution which can combine the waste treatment with the production of valuable products. In this way, the high cost of disposal procedures would be effectively cut down by adding extra value in it. The procedure of production of polyhydroxyalkanoates (PHAs) provides such a beneficial waste treatment which can be applied In various industries, especially in food processing industry where high cost of high BOD wastes treatment is involved (Yu and 51 2001). By using different configurations of bioreactors, several new technologies have been developed demonstrating the feasibility of combining anaerobic digestion of food scraps with aerobic production of biodegradable thermoplastics, polyhydroxyalkanoates (PHAs). Yu and his coworkers (1999) reported the effects of superficial gas and liquid velocities on bed expansion, solid and gas hold-ups and specific oxygen mass transfer rate, kLa by using a type of porous glass beads for immobilization of microbial cells in a three-phase aerobic fluidized bed reactor (AFBR) with an external liquid circulation. This is the first attempt to combine the anaerobic/aerobic treatment of wastewater to produce PHAs. Later on, Du and Yu (2002) developed a new technique to connect the anaerobic reactor and the aerobic reactor through a tubular module of silicone rubber membrane or dialysis membrane. Their efforts yielded 72.S% (wt) PHAs In PHA-producing cells which was the highest polymer content achieved in waste treatment since their work were reported. Although waste water process can get great benefits from PHAs production, the major barrier to widely apply the production of PHAs is their high price, which is more than 10 times higher than the price of synthetic counterparts, reported by Yu and 81 (2001). PHAs have attracted academic and industrial attention due to their potential use as biodegradable thermoplastics. The production cost can be Significantly reduced by raising the scale as well as the productivity of bioreactors. Based on this, we investigate a mini-pilot scale bioreactor (SOL), which is promising to be scaled up to 3000L for PHAs production at a reduced production cost. In this work, a multiple airlifting membrane bioreactor (MAMBR) was designed, fabricated and investigated for operational hydrodynamics and mass transfers (as shown in Flg.1.1).
Description:Thesis (M.S.)--University of Hawaii at Manoa, 2007.
Includes bibliographical references (leaves 93-106).
iv, 106 leaves, bound 29 cm
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Bioengineering

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