Kinetics of organic removal in fixed-bed aerobic biological reactor

Borghei, Seyed Mehdi; Sharbatmaleki, Mohamadali; Pourrezaie, P.; Borghei, G.

doi:10.1016/j.biortech.2007.02.037

Cited by 82 publications

(46 citation statements)

References 9 publications

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“…The objective was to find a model which could closely follow the experimental results and could describe the kinetics of the system. Mathematical models describing the biofilm processes, especially biological filters and Rotating Biological Contactors (RBC), have been proposed in the past [20][21][22][23][24][25][26]. Kincannon and Stover [25] proposed a design concept for RBC's based on total organic loading rate and established a kinetic model for such a reactor.…”

Section: Research Articlementioning

confidence: 99%

Kinetics of Ethylene Glycol Biodegradation in a Sequencing Moving Bed Biofilm Reactor

Esmaeilirad¹,

Borghei²,

Vosoughi³

2015

J Civil Eng Environ Sci

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Treatment of waste water containing ethylene glycol (EG) by implementing a sequence of two Moving Bed Biofilm Reactors (MBBR) were studied. Reactors were operated at different hydraulic retention times (HRT) of 48, 24, 18, and10 hours while EG concentration was in the range of 10 mg/l to 1,150 mg/l. Throughout the experiments the ratio of EG Chemical Oxygen Demand (COD) to total COD was changed from 0.0 to1.0. The maximum removal efficiency of EG was achieved at HRT of 18 hours during the tests and COD removal efficiency varied from 71.7% to 96.7%.To describe the kinetics of biodegradation in biofilm processes, models based on Monod's equations as well as models suggested by other researchers including Grau and Stover-Kincannon were used. As an outcome of this study, both Grau and Kincannon-Stover models were determined to be the most appropriate models for this reactor. These models gave high correlation coefficients and appeared to be able to predict the reactor performance under different conditions. The kinetic studies showed that biofilm diffusion is the most important parameter in controlling the mass transfer phenomena compared to hydraulic factors in the system.

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Section: Research Articlementioning

confidence: 99%

Kinetics of Ethylene Glycol Biodegradation in a Sequencing Moving Bed Biofilm Reactor

Esmaeilirad¹,

Borghei²,

Vosoughi³

2015

J Civil Eng Environ Sci

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“…Therefore, it tended to be washed away in suspended growing biological systems. In the biofilm processes, it could maintain a high cellular retention time, even at low HRT [27], and then nitrobacteria would be able to multiply. When the ratios of COD : NH þ 4 -N were fairly low (i.e., lower than 4 [28]), nitrobacteria would become the prevalent microbes in the biofilm.…”

Section: Organic Loadingmentioning

confidence: 99%

Comparison and modeling of two biofilm processes applied to decentralized wastewater treatment

Qiu

Liu

Song

et al. 2009

Front. Environ. Sci. Eng. China

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In order to control water pollution in the rapidly urbanizing South China area, biological contact oxidation (BCO) process and biological aerated filter (BAF) process were applied in a pilot-scale experiment for decentralized wastewater treatment. An investigation to find the optimal parameters of the two biofilm systems was conducted on hydraulic loading, organic loading, and aeration rate. The results indicated that the water reuse criteria required a maximum hydraulic and organic loading of 30.0 m 3 /(m 2 $d) and 4.0 kg COD/(m 3 $d), respectively, as well as a minimum effluent DO of 4.0 mg/L. The utilization of a new media allowed BAF to perform better than BCO. The kinetic description of the COD removal process for BAF and BCO are S e ¼ S 0 e -0:639t =ð1 þ 1:035tÞ, and S e ¼ S 0 =½ð1 þ 0:947tÞð1 þ 1:242tÞ, respectively. The correlativity analysis showed that the two models could predict the effluent water quality based on the hydraulic retention time. Thus, the appropriate hydraulic loading for certain effluent water quality demands could be determined. The two models could be applied to wastewater treatment practice.

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“…Little has been done on the liquid-solid mass transfer behaviour of such reactors despite the importance of the subject in case of liquid-gas-solid catalytic reactions which are controlled by the liquid-solid mass transfer step. Such a study would assist in designing airlift bioreactors containing packed bed of immobilized enzyme catalyst and microorganisms used to conduct diffusion controlled bioreactions, such as the following examples: production of saccharides [8][9][10], bioethanol production [11][12][13][14][15][16], removal of phenols and other organic pollutants from wastewater [17][18][19][20][21][22], and removal of hexavalent chromium [23,24]. The present reactor can be used also to enhance the rate of mass transfer between the liquid reactant and the fixed enzyme even when air is not involved in the reaction, i.e.…”

Section: Introductionmentioning

confidence: 99%