IAL-CHS (internal airlift loop - ceramic honeycomb supports) reactor used for biodegradation of 2,4-dichlorophenol and phenol

Zhang, Y.; Quan, Xiangchun; Rittmann, Bruce E.; Wang, J.; Shi, Hanchang; Qian, Yi; Yu, Jie

doi:10.2166/wst.2004.0853

Cited by 6 publications

(2 citation statements)

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“…A ceramic honeycomb material obtained from the Pingxiang Sanyuan Ceramic Plant was used as the biofilm carrier in the IPBR. The same kind of ceramic honeycomb carrier was used previously for biofilm biodegradation of phenol, 2,4-dichlorophenol, and quinoline (Zhang et al 2010a;Zhang et al 2010b;Zhang et al 2004;Zhang et al 2002).…”

Section: Methodsmentioning

confidence: 99%

Integrated photocatalytic-biological reactor for accelerated 2,4,6-trichlorophenol degradation and mineralization

et al. 2011

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An integrated photocatalytic-biological reactor (IPBR) was used for accelerated degradation and mineralization of 2,4,6-trichlorophenol (TCP) through simultaneous, intimate coupling of photocatalysis and biodegradation in one reactor. Intimate coupling was realized by circulating the IPBR's liquid contents between a TiO(2) film on mat glass illuminated by UV light and honeycomb ceramics as biofilm carriers. Three protocols-photocatalysis alone (P), biodegradation alone (B), and integrated photocatalysis and biodegradation (photobiodegradation, P&B)-were used for degradation of different initial TCP concentrations. Intimately coupled P&B also was compared with sequential P and B. TCP removal by intimately coupled P&B was faster than that by P and B alone or sequentially coupled P and B. Because photocatalysis relieved TCP inhibition to biodegradation by decreasing its concentration, TCP biodegradation could become more important over the full batch P&B experiments. When phenol, an easy biodegradable compounds, was added to TCP in order to promote TCP mineralization by means of secondary utilization, P&B was superior to P and B in terms of mineralization of TCP, giving 95% removal of chemical oxygen demand. Cl(-) was only partially released during P experiments (24%), and this corresponded to its poor mineralization in P experiments (32%). Thus, intimately coupled P&B in the IPBR made it possible obtain the best features of each: rapid photocatalytic transformation in parallel with mineralization of photocatalytic products.

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Section: Methodsmentioning

confidence: 99%

Integrated photocatalytic-biological reactor for accelerated 2,4,6-trichlorophenol degradation and mineralization

et al. 2011

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“…Recently, the airlift loop reactor (ALR) has been extensively used in fermentations and wastewater treatment processes because of its advantages in terms of simple construction and operation, low investment and operating costs, very fine gas dispersion, definitely directed circulation flow, high mixing and mass-transfer performance, and relatively low power requirements . Numerous investigations have indicated the very good performance of ALRs in phenol biodegradation, in both gas−liquid (G−L) two-phase systems and gas−liquid−solid (G−L−S) three-phase systems. − However, the understanding of these very complex systems, involving coupling of multiphase fluid flow, species interphase mass transfer, and intrinsic bioreaction, is rather limited, which significantly prevents better optimization and scaling-up of ALR processes …”

Section: Introductionmentioning

confidence: 99%

CFD Modeling of Immobilized Phenol Biodegradation in Three-Phase Airlift Loop Reactor

Jia

Wen

Wang

et al. 2009

Ind. Eng. Chem. Res.

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A 3D transient CFD model was developed to simulate the dynamic behaviors of batch phenol biodegradation by immobilized Candida tropicalis in a gas-liquid-solid three-phase airlift loop reactor (ALR), coupling of three-phase fluid flow, species interphase mass transfer, and intrinsic bioreaction, with the bubble size distribution (BSD) determined by the multiple size group (MUSIG) model. Simulation of the time courses of the volume-averaged species mass concentrations in the riser and downcomer of the ALR was performed, whereas the phenol and oxygen concentrations in the liquid phase were validated by corresponding experiments. Source-term comparisons between species interphase mass transfer and bioreaction were done to distinguish the rate-limiting step in the process. Moreover, local transient phenol biodegradation characteristics such as oxygen concentration profiles in the gas, liquid, and solid phases; phenol concentration profiles in the liquid and solid phases; and cell concentration profiles in the solid phase were all predicted reasonably well. Furthermore, the performances of the ALR and a bubble column reactor (BCR) were compared, and the advantage of the former reactor was confirmed.

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Integrated photocatalytic-biological reactor for accelerated phenol mineralization

Zhang

Wang

Rittmann

2010

Appl Microbiol Biotechnol

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An integrated photocatalytic-biological reactor (IPBR) was developed for accelerated phenol degradation and mineralization. In the IPBR, photodegradation and biodegradation occurred simultaneously, but in two separated zones: a piece of mat-glass plate coated with TiO(2) film and illuminated by UV light was connected by internal circulation to a honeycomb ceramic that was the biofilm carrier for biodegradation. This arrangement was designed to give intimate coupling of photocatalysis and biodegradation. Phenol degradation was investigated by following three protocols: photocatlysis with TiO(2) film under ultraviolet light, but no biofilm (photodegradation); biofilm biodegradation with no UV light (biodegradation); and simultaneous photodegradation and biodegradation (intimately coupled photobiodegradation). Photodegradation alone could partly degrade phenol, but was not able to achieve significant mineralization, even with an HRT of 10 h. Biodegradation alone could completely degrade phenol, but it did not mineralize the COD by more than 74%. Photobiodegradation allowed continuous rapid degradation of phenol, but it also led to more complete mineralization of phenol (up to 92%) than the other protocols. The results demonstrate that intimate coupling was achieved by protecting the biofilm from UV and free-radical inhibition. With phenol as the target compound, the main advantage of intimate coupling in the IPBR was increased mineralization, presumably because photocatalysis made soluble microbial products more rapidly biodegradable.

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IAL-CHS (internal airlift loop - ceramic honeycomb supports) reactor used for biodegradation of 2,4-dichlorophenol and phenol

Cited by 6 publications

References 0 publications

Integrated photocatalytic-biological reactor for accelerated 2,4,6-trichlorophenol degradation and mineralization

Integrated photocatalytic-biological reactor for accelerated 2,4,6-trichlorophenol degradation and mineralization

CFD Modeling of Immobilized Phenol Biodegradation in Three-Phase Airlift Loop Reactor

Integrated photocatalytic-biological reactor for accelerated phenol mineralization

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