Mathematical modeling and parameters estimation of anaerobic fermentation processes

1999 ◽  
Author(s):  
Ivan Simeonov
Keyword(s):  
Mathematical Modeling ◽  
Anaerobic Fermentation ◽  
Parameters Estimation ◽  
Fermentation Processes

scholarly journals Battery Model Parameters Estimation Using Simulated Annealing

2017 ◽  
Vol 18 (1) ◽  
pp. 127 ◽  
Author(s):  
Marcia De Fatima Brondani ◽  
Airam Teresa Zago Romcy Sausen ◽  
Paulo Sérgio Sausen ◽  
Manuel Osório Binelo
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Simulated Annealing ◽  
Visual Analysis ◽  
Lithium Ion ◽  
Parameters Estimation ◽  
Model Parameters ◽  
Algorithm Efficiency ◽  
Battery Model ◽  
Discharge Curves

In this paper, a Simulated Annealing (SA) algorithm is proposed for the Battery model parametrization, which is used for the mathematical modeling of the Lithium Ion Polymer (LiPo) batteries lifetime. Experimental data obtained by a testbed were used for model parametrization and validation. The proposed SA algorithm is compared to the traditional parametrization methodology that consists in the visual analysis of discharge curves, and from the results obtained, it is possible to see the model efficacy in batteries lifetime prediction, and the proposed SA algorithm efficiency in the parameters estimation.

scholarly journals Assessment of environmental impact of agricultural biogas plants

2018 ◽  
pp. 24-31
Author(s):  
Monika Janas ◽  
Alicja Zawadzka
Keyword(s):  
Anaerobic Fermentation ◽  
Water Environment ◽  
Comprehensive Analysis ◽  
Gaseous Pollutants ◽  
Potential Range ◽  
Fermentation Processes ◽  
Atmospheric Air ◽  
Biogas Plants ◽  
Solid Liquid ◽  
Soil And Water

Operation of biogas plants, anaerobic fermentation processes, collection and purification of biogas and its subsequent combustion may be a source of environmental hazard. The construction and operation of biogas plants is inextricably connected with the generation and emission of solid, liquid and gaseous pollutants into the environment. The aim of the work is to analyze environmental hazards resulting from the construction and operation of biogas plants. As part of the work, a comprehensive analysis of their impact on individual components of the environment was made. The effect of biogas plants on atmospheric air, soil and water environment and acoustic climate was analyzed and the potential range of these impacts was presented.

scholarly journals COMBINED BIOMASS UTILIZATION SYSTEM

2021 ◽  
Vol 88 (3) ◽  
pp. 36-40
Author(s):  
Viacheslav Morozov ◽  
Ivan Obodovskyi
Keyword(s):  
Energy Production ◽  
Closed Loop ◽  
Anaerobic Fermentation ◽  
Thermal Processes ◽  
Biomass Waste ◽  
Biomass Utilization ◽  
Heating Systems ◽  
Fermentation Processes ◽  
Pilot Fuel ◽  
Different Origins

The purpose of this study is to analyze existing technologies and optimize their operation in a closed-loop production and use of biomass fuel based on existing chemical-biological technologies of biochemical processing of biomass and its anaerobic fermentation processes. The article presents a fundamentally new scheme of biomass utilization of different origins, the implementation of this scheme of utilization of household, sewage, industrial and technological biomass waste will solve simultaneously the problem of preserving the environment in an environmentally friendly condition, to obtain during processing energy sources thermal energy to ensure the flow of biochemical and thermal processes in the installation, and to produce pilot fuel for its use in the processes of heat production of decentralized heating systems and energy production of small and medium-sized settlements, private estates and cottages.

Microbial production of energy sources from biomass

1980 ◽  
Vol 295 (1414) ◽  
pp. 491-500 ◽  
Keyword(s):  
Liquid Fuel ◽  
Significant Contribution ◽  
Anaerobic Fermentation ◽  
Calorific Value ◽  
Tax Credits ◽  
Raw Material ◽  
Energy Sources ◽  
Energy Costs ◽  
Fermentation Processes ◽  
Further Development

Anaerobic fermentation of carbohydrates can yield a range of alcohols, fatty acids, esters and the gases hydrogen and methane. In the microbial conversions for ethanol and methane, 93—95 % of the calorific value of the carbohydrate is retained in the product. However, the capital and energy costs of operating microbial conversions industrially are generally high. At present, fermentation processes for fuels are generally uneconomic without waste disposal credits, or tax credits. The developments required to improve the economics of bioconversion are (i) higher rates of fermentation, (ii) fermentations at higher concentrations of raw material and products, (iii) product recovery methods which consume little energy. Ethanol production is unlikely to contribute to liquid fuel supplies in Britain unless cellulose-based processes using crop wastes or urban refuse are developed. Methane is already produced from some wastes and further development of the anaerobic digestion technology can be expected to make a small but significant contribution to energy supplies. Since the scale of use is much smaller and the value higher, products of anaerobic fermentation could make a more significant contribution to supplies of chemicals.

scholarly journals MASS TRANSFER IN FERMENTATION PROCESSES

2018 ◽  
Vol 12 (1) ◽  
Author(s):  
A. Shevchenko ◽  
A. Sokolenko ◽  
O. Stepanets ◽  
O. Bilyk
Keyword(s):  
Mass Transfer ◽  
Liquid Phase ◽  
Culture Media ◽  
Anaerobic Fermentation ◽  
Superposition Principle ◽  
Cumulative Effect ◽  
Unsaturation Index ◽  
Yeast Cells ◽  
Fermentation Processes ◽  
The Media

The peculiarities of anaerobic fermentation processes with the accumulation of dissolved ethyl alcohol and carbon dioxide in the culture media are considered in the article.The solubility of CO2 is limited by the state of saturation in accordance with Henry’s law. This, with all else being equal, limits the mass transfer on the interface surface of yeast cells and the liquid phase of the medium. A phenomenological model of the media restoration technologies based on the unsaturation index on СО2 is developed. It is shown that this restoration in the existing technologies of fermentation of sugar-rich media occurs, to a limited extent, in self-organized flow circuits, with variable values of temperatures and hydrostatic pressures, due to the creation of unsaturated local zones.It is shown that increasing the height of the media in isovolumetric apparatuses leads to an increase in the levels of flow circuits organization and to the improvement of the desaturation and saturation modes of the liquid phase and intensification of mass transfer processes. Among the deterministic principles of restoring the saturation possibilities of the media, there are forced variables of pressures with time pauses on their lower and upper levels. In such cases, the possibilities of short-term intensive desaturations in full media volumes, the restoration of their saturation perception of CO2, and the activation of fermentation processes are achieved. This direction is technically feasible for active industrial equipment.The cumulative effect of the action of variable pressures and temperatures corresponds to the superposition principle, but at the final stages of fermentation, the pressure and temperature values are leveled, so the restoration of the unsaturation state slows down to the level of the bacteriostatic effect. The possibility of eliminating the disadvantages of the final stage of fermentation by means of programmable variable pressures is shown

scholarly journals Koloni Mikroorganisme pada Kuantitas Nitrogen dan Belerang Hasil Mineralisasi pada Residu Proses Fermentasi Biogas: Analisis Keanekaragaman

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Sitti Norul Hotimah ◽  
Ahmad Syauqi ◽  
Hasan Zayadi
Keyword(s):  
Organic Matter ◽  
Fermentation Process ◽  
Organic Waste ◽  
Anaerobic Fermentation ◽  
Diversity Index ◽  
Domestic Waste ◽  
Fermentation Processes ◽  
A Value ◽  
Sample Test ◽  
The Mean

Biogas is gas that produced by anaerobic activities or fermentation result from organic matter including dirt human and animal, domestic waste (households), biodegradable garbage or any biodegradable organic waste in anaerobic condition.  Bio-slurry or biogas waste is a product of biogas processing that made from a mixture of livestock manure and water through anaerobic fermentation processes in biogas installations. This research was carried out to get the dominance value of microorganism colonies at the quantity of nitrogen and sulphur which the result of mineralization in the biogas fermentation residue, to determine the concentration of NH4+ ( % ) and sulphate ( % ) as the quantity of nitrogen and sulfur by mineralization result at the residue of the biogas fermentation process. This research was usesd method of descriptive – quantitave and SPC analysis. A value of diversity index ( H’ ) of 0.98352 and domination value (D ) of 0.10476. Microbial dominaton was  obtained 31 white microbial colonies, 9 yellowish, and 17 pink. The NH4+ in the sample test was seen from nine replication days, the results of UCL value was 38.57%, LCL was 32.58%, and mean was 35.58%. The results of sulphate concentration in nine replication days was obtained the UCL 3.84%, LCL 2.72%, and the mean 3.28% of sulphate concentration.Keywords: Microorganism, nitrogen, sulphurABSTRAKBiogas adalah gas yang dihasilkan oleh aktivitas anaerobik atau hasil fermentasi dari bahan-bahan organik termasuk kotoran manusia dan hewan, limbah domestik (rumah tangga), sampah yang dapat didegradasi atau setiap limbah organik yang biodegradable. Bioslury atau residu biogas adalah produk proses biogas dibuat dari bahan campuran kotoran ternak dan air melalui proses fermentasi anaerob pada instalasi biogas. Tujuan penelitian ini adalah mendapatkan nilai dominasi koloni mikroorganisme pada kuantitas nitrogen dan belerang hasil mineralisasi pada residu proses fermentasi biogas, menentukan kadar NH4+ (%) dan Sulfat (%) sebagai kuantitas nitrogen dan belerang hasil mineralisasi pada residu proses fermentasi biogas. Penelitian ini menggunakan metode deskriptif – kuantitatif serta analisis SPC. Nilai Indeks Keanekaragaman (H’) 0,98352 dan nilai dominasi (D) 0,10476. Dominasi mikroorganisme didapatkan hasil koloni mikroorganisme bewarna putih sebanyak 31, 9 kekuningan,  dan 17 merah muda. Dari pengamatan NH4+ pada sampel uji diketahui dari sembilan hari ulangan, hasil nilai UCL 38,57%, LCL 32,58%, dan mean 35,58%. Hasil kadar sulfat dalam sembilan hari ulangan tersebut didapatkan hasil UCL 3,84%, LCL 2,72%, dan mean 3,28% kadar sulfat.Kata kunci: mikroorganisme, nitrogen, belerang

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