scholarly journals Conductivity Measurement for Control of a Biogas Plant

2018 ◽  
Vol 66 (5) ◽  
pp. 1151-1156 ◽  
Author(s):  
Richard Klein ◽  
Vlastimil Slaný ◽  
Eva Krčálová
Keyword(s):  
Biogas Production ◽  
Control Variable ◽  
Conductivity Measurement ◽  
Electrical Energy ◽  
The Other ◽  
Specific Production ◽  
Green Electricity ◽  
Production Methods ◽  
Modern Times ◽  
Biogas Plants

Nowadays in these modern times, when the majority of technologies are dependent on electrical energy, it is necessary to build new sources of energy ecologically and still improve their efficiency. One of the branches, which can contribute to ecology, is biogas plants. When biogas production methods are properly applied in them, these biogas plants have two advantages. One of them is the disposal of biowaste, the other is the production of green electricity in cogeneration units. In this article, steps which will enable better control of biogas transformations are listed. Therefore, they will contribute to the eco biogas production. The innovative approach involves adding new control variable. This variable can be shown in advance of the reaction, as evidenced by the charts. Results for evaluation were measured in the bioreactor during 20 experiments. Most (14) experiments were identical with residues from wine. The residue measurement was performed on three experiments in the remaining biomaterials. The course of production of methane always copied progress conductivity. This fact is evident from the graphs on Figs. 2–4. The methods used for data processing were: removal creeping values, statistic methods (median, average) and interpolation. It can be concluded from the results that the conductivity of digestate predicts specific production of biogas.

scholarly journals CFD Modelling of Biomass Mixing in Anaerobic Digesters of Biogas Plants

2019 ◽  
Vol 23 (3) ◽  
pp. 57-69 ◽  
Author(s):  
Fosca Conti ◽  
Abdessamad Saidi ◽  
Markus Goldbrunner
Keyword(s):  
Fluid Dynamics ◽  
Energy Demand ◽  
Biogas Production ◽  
Electricity Consumption ◽  
Electrical Energy ◽  
Matter Content ◽  
Dry Matter Content ◽  
Cfd Modelling ◽  
Anaerobic Digesters ◽  
Biogas Plants

Abstract Cut in greenhouse gas emissions, increment of energy from renewables and improvement in energy efficiency represent the three key targets for future energy systems. Among the available bioenergy technologies, biogas production via biodegradation and anaerobic digestion is a widely applied approach, not only to produce biofuels but also to manage industrial and domestic organic waste. Within the biogas production, a sufficient mixing of the organic mass is a crucial step to ensure high biogas yields by bacteria and enzymes. Measurements of the electric power consumption of biogas plants revealed that the electrical energy demand of the stirrer system has a high share of the total electricity consumption of a biogas plant. Investigations on real biogas digesters to optimize the mixing process are cost and time intensive. Therefore, laboratory prototypes and computational simulations represent promising alternatives to analyse and improve the efficiency of mixing systems. In this paper, a computational fluid dynamics (CFD) model is presented, which is applied to commercial stirring systems. The case of two propeller stirrers, located in diametrically opposite positions in a tank filled with ca. 1400 m3 of substrate is described in detail. For the simulation, the rheology of the fluid is adapted to a biomass with 12 wt % dry matter content and obeying the non-Newtonian generalized Ostwald-de Waele power law. The developed simulation procedure considers the rotation angle of each propeller and its height. A total of 441 mixing configurations are calculated and evaluated in terms of the technical benefit. The investigation reveals that locations of the rotors far away from the bottom and high rotational angles cause advantageous fluid dynamics.

scholarly journals Dependence of energy consumptions on the type of mechanical mixer used in the biogas reactor

2021 ◽  
pp. 26-33
Author(s):  
M.O. Spodoba ◽  
М.М. Zablodskiy
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Electrical Energy ◽  
Energy Costs ◽  
Biogas Plants ◽  
Efficient Type ◽  
Biogas Reactor

Purpose. Investigation of the dependence of the energy consumption of mechanical mixers and determination of an energy-efficient type of mixing device to increase the energy efficiency of the biogas formation process and the profitability of further processing into thermal and electrical energy. Methodology. Determination and analysis of energy costs for mechanical mixers, comparison and determination of their energy consumption in the process of biogas formation, generalization of the results. Findings. Biogas technologies play an important role in the formation of a modern energy system. The profitability of which directly depends on the energy efficiency of the processes of intensification of anaerobic fermentation. The process of anaerobic fermentation of waste is long, so one of the main methods of intensification of biogas production is the mixing of waste during anaerobic fermentation. Despite the large number of different types of mixing devices and systems, the main task of mixing is to create a homogeneous substance with the same temperature, acidity and other physicochemical components at any point in the volume of the substance. There is a need to increase the energy efficiency of the processes of intensification of anaerobic fermentation and the profitability of further processing of biogas into heat and electricity. Ways to improve energy efficiency are in certain dependences of the energy consumption of mechanical mixers, the choice of an energy-efficient type of mixer, certain criteria that significantly affect the consumption of electrical energy for mixing, the study of the vectors of propagation of flows created by the mixer. The implementation of these actions will allow you to establish the optimal geometric dimensions of the mixer and significantly increase the energy efficiency of biogas plants and further processing of the resulting biogas into thermal and electrical energy. Originality.  The analysis of the reasons for different values of the Euler criterion for mechanical mixers is carried out with the same mode of the substance motion, its level and volume in the tank and other equal parameters. A comparative analysis of energy costs for the most common types of mechanical mixers in biogas reactors is carried out. It has been established that the use of a two-tier paddle mixer, which has two blades per tier, requires the least amount of energy to mix waste in a biogas reactor with a volume . Practical value. The data presented in this paper can be used in the design, construction and modernization of biogas plants. The direction of necessary further scientific researches is determined, the realization of which will increase the energy efficiency of biogas production and the profitability of further processing of biogas into thermal and electric energy.

ISLAMIC COINS FROM EASTERN GIZA (EGYPT)

2020 ◽  
pp. 57-62
Author(s):  
E. Yu. Goncharov ◽  
◽  
S. E. Malykh ◽  
Keyword(s):  
Middle Ages ◽  
Human Activity ◽  
The Other ◽  
Dynamic Nature ◽  
14Th Century ◽  
Modern Times ◽  
Ancient Egyptian ◽  
Ancient Rock ◽  
Oriental Studies ◽  
The Middle Ages

The article focuses on the attribution of one gold and two copper coins discovered by the Russian Archaeological Mission of the Institute of Oriental Studies RAS in the ancient Egyptian necropolis of Giza. Coins come from mixed fillings of the burial shafts of the Ancient Egyptian rock-cut tombs of the second half of the 3rd millennium B.C. According to the archaeological context, the coins belong to the stages of the destruction of ancient burials that took place during the Middle Ages and Modern times. One of the coins is a Mamluk fals dating back to the first half of the 14th century A.D., the other two belong to the 1830s — the Ottoman period in Egypt, and are attributed as gold a buchuk hayriye and its copper imitation. Coins are rare for the ancient necropolis and are mainly limited to specimens of the 19th–20th centuries. In general, taking into account the numerous finds of other objects — fragments of ceramic, porcelain and glass utensils, metal ware, glass and copper decorations, we can talk about the dynamic nature of human activity in the ancient Egyptian cemetery in the 2nd millennium A.D. Egyptians and European travelers used the ancient rock-cut tombs as permanent habitats or temporary sites, leaving material traces of their stay.

scholarly journals Empirical Validation of a Biogas Plant Simulation Model and Analysis of Biogas Upgrading Potentials

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2424
Author(s):  
Jan Martin Zepter ◽  
Jan Engelhardt ◽  
Tatiana Gabderakhmanova ◽  
Mattia Marinelli
Keyword(s):  
Simulation Model ◽  
Biogas Production ◽  
Biogas Plant ◽  
Raw Material ◽  
Biogas Upgrading ◽  
Integrated Energy Systems ◽  
First Order Kinetics ◽  
Biogas Plants ◽  
Plant Simulation ◽  
Kinetics Of

Biogas plants may support the transformation towards renewable-based and integrated energy systems by providing dispatchable co-generation as well as opportunities for biogas upgrading or power-to-X conversion. In this paper, a simulation model that comprises the main dynamics of the internal processes of a biogas plant is developed. Based on first-order kinetics of the anaerobic digestion process, the biogas production of an input feeding schedule of raw material can be estimated. The output of the plant in terms of electrical and thermal energy is validated against empirical data from a 3-MW biogas plant on the Danish island of Bornholm. The results show that the model provides an accurate representation of the processes within a biogas plant. The paper further provides insights on the functioning of the biogas plant on Bornholm as well as discusses upgrading potentials of biogas to biomethane at the plant from an energy perspective.

The Smugglers' Trade: A Neglected Aspect of English Commercial Development

1952 ◽  
Vol 2 ◽  
pp. 131-157 ◽  
Author(s):  
G. D. Ramsay
Keyword(s):  
Eighteenth Century ◽  
Foreign Trade ◽  
Free Trade ◽  
Technical Skill ◽  
The Other ◽  
Raw Material ◽  
Commercial Development ◽  
Illicit Trade ◽  
Modern Times ◽  
Victorian Age

Some share—fluctuating and uncertain, but assuredly significant—of English foreign trade in modern times is to be credited to smugglers, who were ever busy in evading customs regulations and prohibitions. Mere administrative watchfulness and thoroughness could never do more than damp their activities; it was only the triumph of free trade in the early Victorian age that deprived them of their livelihood, and until then they were able to match by increase of cunning and of organization the ever more elaborate network of the customs system—its spies, its coastguards and its cutters as well as its routine officials at the ports. The smuggler flourished right down to the end of the period of protection, despite sporadic seizures by the revenue officers. In the first half of the nineteenth century, French wines, brandies and luxury textiles were being punctually shipped across the Channel in the teeth of prohibitions. In the other direction, we know, for instance, of the existence in the same period of so remarkable á phenomenon as the muslin manufacture of Tarare, near Lyons, which relied for its raw material upon the assured supply of English yarn owled abroad. But it was probably the eighteenth century, when customs regulations were at their most burdensome and complicated, that marked the classic epoch of illicit trade, the period in which the technical skill of both breakers and defenders of the law might earn the highest rewards.

Literature, Media and Market

2021 ◽  
Vol 9 (8) ◽  
pp. 2176-2178
Author(s):  
Dr. Jnanee Debasish Mishra
Keyword(s):  
Daily Life ◽  
Great Influence ◽  
The Other ◽  
Media Ethics ◽  
Modern Times ◽  
Market Communication ◽  
The Media ◽  
Media Market

Synopsis: Literature is the medicine for man and civilization for years. It attracts and affects the soul and mind. In modern times transformation of media makes a big difference in human approach. Though Communication is the primary aim of media, but it works like a window of conscience. In the age of globalization the media has a great influence on society. Though market is an economical concept but our daily life is bound to rely upon it. And now literature, media and market remain in an inter related manner. One affects the other two. This analysis tries to find out the inter relationship among literature, media and market. Keywords: Literature, Media, Market, Communication, Globalization, Literary Sensibility, Media ethics, Change in media approach

scholarly journals Evaluation of Eco-Efficiency of Two Alternative Agricultural Biogas Plants

2018 ◽  
Vol 8 (11) ◽  
pp. 2083 ◽  
Author(s):  
Magdalena Muradin ◽  
Katarzyna Joachimiak-Lechman ◽  
Zenon Foltynowicz
Keyword(s):  
Waste Heat ◽  
Negative Impact ◽  
Biogas Production ◽  
Biogas Plant ◽  
Waste To Energy ◽  
Cost Calculation ◽  
Processing Plant ◽  
The European Union ◽  
Levelized Cost Of Electricity ◽  
Biogas Plants

Implementation of the circular economy is one of the priorities of the European Union, and energy efficiency is one of its pillars. This article discusses an effective use of agri-food industry waste for the purposes of waste-to-energy in biogas plants. Its basic objective is the comparative assessment of the eco-efficiency of biogas production depending on the type of feedstock used, its transport and possibility to use generated heat. The environmental impact of the analysed installations was assessed with the application of the Life Cycle Assessment (LCA) methodology. Cost calculation was performed using the Levelized Cost of Electricity (LCOE) method. The LCA analysis indicated that a biogas plant with a lower level of waste heat use where substrates were delivered by wheeled transport has a negative impact on the environment. The structure of distributed energy production cost indicates a substantial share of feedstock supply costs in the total value of the LCOE ratio. Thus, the factor affecting the achievement of high eco-efficiency is the location of a biogas plant in the vicinity of an agri-food processing plant, from which the basic feedstock for biogas production is supplied with the transmission pipeline, whereas heat is transferred for the needs of production processes in a processing plant or farm.

scholarly journals Geospatial Analysis and Environmental Impact Assessment of a Holistic and Interdisciplinary Approach to the Biogas Sector

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5374
Author(s):  
Robert Bedoić ◽  
Goran Smoljanić ◽  
Tomislav Pukšec ◽  
Lidija Čuček ◽  
Davor Ljubas ◽  
...  
Keyword(s):  
Biogas Production ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Interdisciplinary Approach ◽  
Environmental Benefits ◽  
Maize Silage ◽  
Alternative Pathways ◽  
Agriculture Industry ◽  
Biogas Plants ◽  
The Impact

Crop-based biogas energy production, in combination with electricity generation under subsidy schemes, is no longer considered a favourable business model for biogas plants. Switching to low-cost or gate fee feedstocks and utilising biogas via alternative pathways could contribute to making existing plants fit for future operations and could open up new space for further expansion of the biogas sector. The aim of this study was to combine a holistic and interdisciplinary approach for both the biogas production side and the utilisation side to evaluate the impact of integrating the biogas sector with waste management systems and energy systems operating with a high share of renewable energy sources. The geospatial availability of residue materials from agriculture, industry and municipalities was assessed using QGIS software for the case of Northern Croatia with the goal of replacing maize silage in the operation of existing biogas plants. Furthermore, the analysis included positioning new biogas plants, which would produce renewable gas. The overall approach was evaluated through life cycle assessment using SimaPro software to quantify the environmental benefits and identify the bottlenecks of the implemented actions. The results showed that the given feedstocks could replace 212 GWh of biogas from maize silage in the relevant region and create an additional 191 GWh of biomethane in new plants. The LCA revealed that the proposed measures would contribute to the decarbonisation of natural gas by creating environmental benefits that are 36 times greater compared to a business-as-usual concept. The presented approach could be of interest to stakeholders in the biogas sector anywhere in the world to encourage further integration of biogas technologies into energy and environmental transitions.

scholarly journals Early Slavic housing from Belz surroundings

2020 ◽  
Vol 24 ◽  
pp. 224-234
Author(s):  
Taras Mylian
Keyword(s):  
Cultural Heritage ◽  
Key Words ◽  
Middle Ages ◽  
The Other ◽  
Compacted Clay ◽  
Modern Times ◽  
Big City ◽  
Conservation Research ◽  
First Time ◽  
The Middle Ages

Territory of the upper reaches of Western Bug River, especially the annalistic of Belz in Solokiya and its surroundings, is rich in archeological sites. In 2016, as part of the Program «Protection and Preservation of the Cultural Heritage of the Lviv Region for 2016–2018», conservation research was conducted at the settlement Belz 22 (Hora). It is a multi-layered settlement with cultural and chronological horizons from the final Paleolithic to modern times. Information and research on it were conducted with advantages during XX century however, for the first time in the settlement; remains of a Slavic dwelling-semi-dugout (object 20) of the Prague culture were discovered and studied. Research has shown that dwelling had two periods of functioning. Traces of restructuring were confirmed, which led to a reduction of the area and changing of the shape – from rectangular to square. Evidence of the reconstruction was the remains of two clay ovens, the oldest of which was partially cut down by a later wall. Under the remains of this wall above the furnace a Roman denarius of the II century was found. Ovens are built on special sites made of compacted clay. The older oven has a dome lined with special rollers. Discovered material is represented mainly by handmade ceramic pots, some of them are reconstructed. Some of the forms of utensils were common during the late V – early VI centuries, and the other part – during the second half of VI – early VII century. This division corresponded to the periods of housing. An important find was the weights for the loom, which were reused to build the oven. An additional evidence of the development of weaving in the settlement is a bi-conical spinner with flat platforms, which comes from dwelling. The settlement on the outskirts of the annalistic Belz is characterized by permanence and genetic connection throughout the Middle Ages – from individual Slavic settlements in this region to the creation of a separate principality around the big city. Key words: Prague culture, Belz, Solokiya, dwelling, oven, ceramics, denarius.

scholarly journals Kändisförfattarens varumärke i Finland

2012 ◽  
Vol 40 (114) ◽  
pp. 143-158
Author(s):  
Tarja-Lisa Hypén
Keyword(s):  
21St Century ◽  
Home Country ◽  
The Other ◽  
Modern Times ◽  
American Research ◽  
Anglo American ◽  
The One ◽  
Relationship Of ◽  
The Relationship

THE BRAND OF THE CELEBRITY AUTHOR IN FINLAND | In the 21st century, the celebrity author has begun to interest researchers not only as a marketing phenomenon, but also as the literary institution’s own phenomenon. In my article, I explore the relationship of the celebrity author to the so-called acclaimed authors of modern times. In Anglo-American research, the celebrity author and the bestselling author are distinguished as separate author types, but in the case of Finnish Jari Tervo, these types combine. For almost 20 years, Jari Tervo has been amongboth the most sold and the most visible celebrity authors in his home country. I examine how the publicity and brand of the Finnish celebrity author are formed. I consider how the brand affects the author’s works on the one hand, and the reception of the works on the other. I point out the limiting effects of the brand, but I also examine how, in combining the high and the low, it affords mobility in the literary fields while it also offers an opportunity to influence society.

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