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Ali Demirci – 1st expert on this subject based on the ideXlab platform
Application of mathematical models to ethanol fermentation in Biofilm Reactor with carob extractBiomass Conversion and Biorefinery, 2019Co-Authors: Mustafa Germec, Kuan-chen Cheng, Ali Demirci, Mustafa Karhan, Irfan TurhanAbstract:
Mathematical models not only ensure information about kinetic-metabolic nature of fermentations, but also facilitate their control and optimization. In the study, flexible ten models were evaluated and employed to describe the ethanol fermentation in a Biofilm Reactor with a carob extract medium (CEM). Findings indicated that W model well fitted the experimental data of cell growth (root mean square error (RMSE) = 0.289 g/L, mean absolute error (MAE) = 0.237 g/L, regression coefficient ( R ^ 2 ) = 0.9944, bias factor (BF) = 1.021, and accuracy factor (AF) = 1.047), ethanol production (RMSE = 1.609 g/L, MAE = 1.277 g/L, R ^ 2 = 0.9774, BF = 1.178, and AF = 1.283), and substrate consumption (RMSE = 2.493 g/L, MAE = 1.546 g/L, R ^ 2 = 0.9931, BF = 1.001 and AF = 1.053). In the prediction of kinetic parameters, W model also gave better and well-directed results compared with the other mathematical models used in the study. When an independent set of experimental data was used in the validation of mathematical models, similar validation results were obtained and W model was also successful. Consequently, W model could be used for more progress of fermentation process in Biofilm Reactor with CEM, which can serve as a universal equation.
Ethanol production from carob extract by using Saccharomyces cerevisiae in Biofilm Reactor2016 ASABE International Meeting, 2016Co-Authors: Mustafa Germec, Irfan Turhan, Mustafa Karhan, Ali DemirciAbstract:
Abstract. Carob, widely grown in Mediterranean countries, contains several types of sugars such as 34 42% sucrose, 7-10% glucose, and 10-12% fructose. Due to the high sugar concentration, it is used for production of many value added products via fermentation such as ethanol, lactic acid, citric acid, pullulan, and mannanase. In this study, ethanol production conditions from carob extract through repeated-batch fermentation by using Saccharomycess cerevisiae in Biofilm Reactor were optimized by response surface methodology. Initial sugar concentration (4-10°Bx), agitation speed (100-200 rpm), and pH (5.0-6.0) were used as variable parameters. Results showed that initial sugar concentration had a significant effect on yield and maximum production rate. Optimum conditions were found to be 7.71°Bx, 120 rpm, and 5.18, respectively. After validation experiments ethanol concentration, yield, maximum production rate, and sugar utilization yield were determined as 24.51 g/L, 48.59%, 2.14 g/L/h, and 87.33%, respectively and fermentation time was reduced to 12 h using a Biofilm Reactor due to high biomass concentration as Biofilms. Moreover, the effect of nitrogen sources used in media and non-enriched medium were also investigated. According to results while ethanol production, yield, and maximum production rate were considerably reduced compared to optimized conditions in Biofilm Reactor, sugar utilization yield was slightly similar. Consequently, whether ethanol production from carob extract in Biofilm Reactor was victoriously performed, fermentation time was significantly decreased compared to data in the literature.
ethanol production via repeated batch fermentation from carob pod extract by using saccharomyces cerevisiae in Biofilm ReactorFuel, 2015Co-Authors: Irfan Turhan, Mustafa Germec, Mustafa Karhan, Ali DemirciAbstract:
Abstract In present study, repeated-batch fermentation in Biofilm Reactor was evaluated for ethanol production by using carob extract. Response surface method (RSM) was used to determine optimum initial sugar concentration, pH, and agitation in the constructed Biofilm Reactor. The optimum conditions for ethanol production in Biofilm Reactor were determined as initial sugar content of 7.71°Bx, pH of 5.18 and agitation of 120 rpm. The ethanol production (P), the yield (YP/S) and production rate (QP) were found as 24.51 g/L 48.59% and 2.14 g/L/h at the optimized conditions, respectively. The fermentation time for maximum ethanol production in carob extract was reduced to 12 h by using a Biofilm Reactor compared the published data in the literature, which was 30 and 24 h by using suspended and immobilized yeasts in a stirred tank Reactor, respectively. Furthermore, the effect of various nitrogen sources and enrichment were also evaluated and YP/S, QS and QP were significantly decreased compared to the results obtained from optimum conditions in Biofilm Reactor. Overall, results showed that a Biofilm Reactor for ethanol production from carob extract can be successfully implemented in point of reducing fermentation time, eliminate re-inoculation of the typical batch fermentation as well as increasing production yield.
Hallvard Ødegaard – 2nd expert on this subject based on the ideXlab platform
aerobic moving bed Biofilm Reactor treating thermomechanical pulping whitewater under thermophilic conditionsWater Research, 2002Co-Authors: Sigrun J Jahren, Jukka Rintala, Hallvard ØdegaardAbstract:
Abstract The continuously operated laboratory scale Kaldnes moving bed Biofilm Reactor (MBBR) was used for thermophilic (55°C) aerobic treatment of TMP whitewater. In the MBBR, the biomass is grown on carrier elements that move along with the water in the Reactor. Inoculation with mesophilic activated sludge gave 60–65% SCOD removal from the first day onwards. During the 107 days of experiment, the 60–65% SCOD removals were achieved at organic loading rates of 2.5–3.5 kg SCOD m−3 d−1, the highest loading rates applied during the run and HRT of 13–22 h. Carbohydrates, which contributed to 50–60% of the influent SCOD, were removed by 90–95%, while less than 15% of the lignin-like material (30–35% of SCODin) was removed. The sludge yield was 0.23 g VSS g SCODremoved−1. The results show that the aerobic Biofilm process can be successfully operated under thermophilic conditions.
The Moving Bed Biofilm Reactor, 1999Co-Authors: Hallvard ØdegaardAbstract:
A new Biofilm Reactor for wastewater treatment, the moving bed Biofilm Reactor (MBBR), is discussed. A general description of the Reactor is given. Results from investigations of different applications (carbonaceous removal, nitrification and nitrogen removal) when used for municipal wastewater treatment, are discussed. Design values are given and it is demonstrated that use of this Reactor results in very compact treatment plants .
a new moving bed Biofilm Reactor applications and resultsWater Science and Technology, 1994Co-Authors: Hallvard Ødegaard, Bjorn Rusten, T WestrumAbstract:
A new moving bed Biofilm Reactor has been developed in Norway. The biomass is attached to carrier elements that move freely along with the water in the Reactor. It is demonstrated in the paper that this results in a very compact Reactor and a very efficient biomass. Experiences from pilot and full-scale testing of the Reactor in municipal and industrial wastewater treatment applications are presented and discussed.
Yan Zhang – 3rd expert on this subject based on the ideXlab platform
high thermostable ordered mesoporous sio2 tio2 coated circulating bed Biofilm Reactor for unpredictable photocatalytic and biocatalytic performanceApplied Catalysis B-environmental, 2016Co-Authors: Yan Zhang, Linlin Zhang, Zipeng Xing, Hang Zhang, Zhenzi Li, Xiaoyan Wu, Xiaodong Zhang, Wei ZhouAbstract:
Abstract Utilizing high thermostable ordered mesoporous SiO2–TiO2 as a precursor, macroporous polyurethane foam (PUF) as a floating Biofilm carrier, the photocatalytic circulating-bed Biofilm Reactor (PCBBR) is fabricated via ultrasonic vibration and deposition approach. The prepared SiO2–TiO2/PUF carrier is characterized in detail by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, N2 adsorption, scanning electron microscopy and energy dispersive spectroscopy. The results indicate that the ordered mesoporous SiO2–TiO2 network can be maintained and the presence of SiO2 can inhibit the anatase-to-rutile phase transformation during 800 °C calcinations. Furthermore, the prepared SiO2–TiO2/PUF carrier presents a hierarchical macro/mesoporous structure, filling the bacterium to the channels. The PCBBR exhibits good synergic effect for the refractory phenolic wastewater, and the total organic carbon removal ratio of high toxic 2,4,5-trichlorophenol is up to 97.5% after hydraulic retention time for 3 h, which is ascribed to the hierarchical macro/mesoporous structure in favor of pollutants adsorption, efficient photon utilization and microorganism loading. This novel ordered mesoporous SiO2–TiO2 coated circulating-bed Biofilm Reactor is promising in the environmental field.
aging Biofilm from a full scale moving bed Biofilm Reactor characterization and enzymatic treatment studyBioresource Technology, 2014Co-Authors: Hui Huang, Lili Ding, Jinju Geng, Ke Xu, Yan ZhangAbstract:
Abstract Effective removal of aging Biofilm deserves to receive more attention. This study aimed to characterized aging Biofilm from a full-scale moving bed Biofilm Reactor treating pharmaceutical wastewater and evaluate the hydrolysis effects of Biofilm by different enzymatic treatments. Results from FTIR and biochemical composition analyses showed that it was a predominately organic-based Biofilm with the ratio of total protein (PN) to polysaccharide (PS) of 20.17. A reticular structure of extracellular polymeric matrix (EPM) with filamentous bacteria as the skeleton was observed on the basal layer through SEM–EDS test. Among the four commercial proteases and amylases from Genencor®, proteases were shown to have better performances than amylases either on the removal of MLSS and PN/MLSS or on DOC (i.e., dissolved organic carbon)/MLSS raising of Biofilm pellets. Difference of dynamic fluorescence characteristics of dissolved organic matters after treated by the two proteases indicated distinguishing mechanisms of the treating process.
Effect of DO on simultaneous nitrification and denitrification in catching bed Biofilm Reactor2011 International Conference on Electrical and Control Engineering, 2011Co-Authors: Yan Zhang, Yanqing Zhang, Hui Wang, Lili Wang, Zhengyang YangAbstract:
In this study, effect of DO on simultaneous nitrification and denitrification in catching bed Biofilm Reactor were investigated, using three sets of parallel Reactors controlled with different DO concentration. The average removal rate of COD was reached at 87% over the range of 0~3mg/L of DO. Comparely, NH4+-N removal rate increased significantly with the increase of DO concentration. The optimize DO concentration was 2~3, the average removal rate of NH4+-N and TN were 91.6% and 64.4% respectively.