scholarly journals Possibilities of Using White Sweetclover Grown in Mixture with Maize for Biomethane Production

Agronomy ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1407
Author(s):  
Antonín Kintl ◽  
Jakub Elbl ◽  
Tomáš Vítěz ◽  
Martin Brtnický ◽  
Jiří Skládanka ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Plant Biomass ◽  
Arable Land ◽  
Arable Soil ◽  
Biogas Plant ◽  
Methane Yield ◽  
Soil Protection ◽  
Mixed Cropping ◽  
Fermentation Inhibitors ◽  
Biogas Yield

Methods of growing plant biomass for the production of biogas in anaerobic digestion plants have a decisive influence on arable land and on the evaluation of biogas plant technologies from the environmental point of view. The main benefit of anaerobic digestion is the possibility to use various agricultural crops for energy production. Some of these plant species, e.g., legumes, are generally considered to be beneficial for arable soil quality, as compared with maize monocultures with frequently manifested soil degradation and adverse environmental impact on arable land. A possible change is offered by cultivation systems composed of two and more crops and defined as mixed cropping (MC) systems. The systems are characterized by a more efficient utilization of natural resources of the site as well as by a greater potential for arable soil protection. A question remains as to whether the MC system of growing maize and white sweetclover can be used for biogas yield. In the presented research study, a mixed cropping system was tested with maize (Zea mays L.) and white sweetclover (Melilotus albus MED.). The goal of our research was to determine an optimum ratio of maize and white sweetclover (s.c.) shreddings in silage for a biogas plant. For this purpose, model micro-silages of monocultures were prepared: maize (100%), white s.c. (100%), as well as variants with different weight shares of these two crops (maize:white s.c.; 3:7, 1:1, 7:3, 8:2, 8.5:1.5, 9:1). The silages were subjected to biomethanation tests, in order to determine the influence of the increased addition of white s.c. biomass on methane yield and methane concentration in biogas. The highest values of biogas yield were recorded in the maize monoculture and in the MC variant of maize and white s.c. at 9:1 (>0.26 m3/kgVS). The lowest methane yield values were recorded in the white s.c. monoculture (0.16 m3/kgVS). It was found out that the yield of methane decreased with an increasing share of white sweetclover in the maize silage, due to the increased content of poorly degradable organic substances and the presence of fermentation inhibitors (e.g., coumarin).

Influence of Total Solid and Stirring Frequency on Performance of Dry Anaerobic Digestion Treating Cattle Manure

2011 ◽  
Vol 79 ◽  
pp. 48-52 ◽  
Author(s):  
Hong Li Li ◽  
Yan Wang
Keyword(s):  
Anaerobic Digestion ◽  
Total Solid ◽  
Performance Parameter ◽  
Cattle Manure ◽  
Methane Yield ◽  
Operational Parameter ◽  
Experimental Procedure ◽  
Methane Generation ◽  
Biogas Yield ◽  
Dry Anaerobic Digestion

The aim of this paper was to analyze the biomethanization process of cattle manure with four different total solid percentages (15%, 20%, 25%, 30% TS) and three different stirring frequency. The experimental procedure was programmed to select the initial performance parameter and the operational parameter in a lab-reactor. The values of VFAs indicated that all the reactors showed no destabilization and at the end of the experiment the VFAs were consumed completely. The best performance for cattle manure biodegradation and methane generation was the reactor with 20% TS, with the biogas yield of 0.22 L/g VS and the methane yield of 0.11 LCH4/g VS. Furthermore, the better operational parameter of stirring frequency was stirring once every two days.

Engineering AD

2020 ◽  
Author(s):  
Jacob Joseph Lamb
Keyword(s):  
Renewable Energy ◽  
Anaerobic Digestion ◽  
Waste Management ◽  
Process Engineering ◽  
Biogas Plant ◽  
Maximum Efficiency ◽  
Design Phase ◽  
Biogas Yield ◽  
Essential Step ◽  
Efficiency And Productivity

Engineering of anaerobic digestion is an essential step in the design phase of a biogas plant. In order to achieve maximum efficiency and productivity, there are many considerations to be made. The enhancement of the biogas yield from the cycle of anaerobic digestion by analyzing some of the factors that affect the plant’s efficiency in terms of its versatility as a waste management device, as a source of renewable energy and the role it may play in preserving the environment. These considerations are known for process microbiology and biochemistry, process engineering architecture and properties of feedstock. This chapter intends on covering these aspects and giving some foundation behind specific considerations for biogas plant planning.

Investigation of Biogas Production Using Organic Kitchen Wastes through Anaerobic Digestion

2015 ◽  
Vol 787 ◽  
pp. 97-101
Author(s):  
D. Thamilselvan ◽  
K. Arulkumar ◽  
M. Kannan
Keyword(s):  
Anaerobic Digestion ◽  
Fossil Fuels ◽  
Biogas Production ◽  
Renewable Resource ◽  
Biogas Plant ◽  
Cow Dung ◽  
Fermentation Time ◽  
Ph Variation ◽  
Biogas Yield ◽  
Oil Crisis

The present day’sresearch interests on bioenergy have been expanded rapidly due to oil crisis of 1980s. This bio energy should be available in locally and it’spurer than the fossil fuels. The field of bio energyis important for governments, scientists and business people in worldwide because of its available in nature and renewable resource. Todays the most important renewable energy is Biomass. The biological conversion of biomass to methane has become rapidly increasing in present days. All types of organic wastes can be converted to methane. In this study the installed plant is a sintex floating type biogas plant. The cubic capacity of plant is about 1000 liter. The pH range is maintained in the level of 6.8 to 7.5. The fermentation time of the anaerobic digestion for the efficient usage of gas as a fuel is about 30 days. Our biogas plant is used for all types of anaerobic respirating wastes such as cow dung manure, kitchen wastes etc.The input feed of kitchen waste is about 10 kg per day. The output of the biogas yield is about 0.714 m3/kg. The composition of biogas is 50% to 60% of methane and rather than remaining 30% to 40% CO2and small amount of water about 2% to 5%. The performance characteristics of biogas plant are studied in this paper. To evaluate the performance of biogas production and pH variation throughout this study.

scholarly journals Utilization of Oak (Quercus petreae (Matt.) Liebl.) Bark for Anaerobic Digested Biogas Production

2017 ◽  
Vol 13 (2) ◽  
pp. 125-134 ◽  
Author(s):  
Ádám Nándor Makk ◽  
Tamás Rétfalvi ◽  
Tamás Hofmann
Keyword(s):  
Anaerobic Digestion ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Methane Yield ◽  
Tree Bark ◽  
Basic Material ◽  
Pedunculate Oak ◽  
Key Factors ◽  
Biogas Yield ◽  
Lignocellulosic Residue

Abstract Fossil fuel depletion has led to an increasing number of research studies and applications focusing on renewable energy, such as different types of biomass. Lignocellulosic biomass represents an abundant source of biomass suitable for energy production in various forms. The present research investigates the application possibility of pedunculate oak bark (Quercus petrea (Matt.) Liebl.) for the production of biogas via anaerobic digestion. This research has significant novelty, as only a few examples on the utilization of tree bark wastes for the production of biogas can be found in the scientific literature. One of the key factors of increasing biogas yield is the efficient hydrolysis of the basic material, which is achieved by different pretreatment methods. In this study, oak bark was pretreated by microwave energy, by extraction, and by the combination of these two methods. The semi-continuous thermophylic anaerobic digestion of untreated oak bark resulted a 76.3 ml/g volatile solid specific methane yield over a 50-day period, which was not significantly lower than methane yield gained from pretreated basic material. Results indicated that oak bark is suitable for the production of biogas even without the application of the investigated pretreatment techniques. As extraction of oak bark does not impair biogas production, the complex biorefinery utilization of oak bark in the form of extraction bark polyphenols and the subsequent anaerobic fermentation of lignocellulosic residue can be accomplished in the future.

scholarly journals Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 600 ◽  
Author(s):  
Sagor Kumar Pramanik ◽  
Fatihah Binti Suja ◽  
Mojtaba Porhemmat ◽  
Biplob Kumar Pramanik
Keyword(s):  
Experimental Data ◽  
Anaerobic Digestion ◽  
Kinetic Model ◽  
Removal Efficiency ◽  
Food Waste ◽  
Biogas Production ◽  
Gompertz Model ◽  
Methane Yield ◽  
Biogas Yield ◽  
Modified Gompertz Model

A large quantity of food waste (FW) is generated annually across the world and results in environmental pollution and degradation. This study investigated the performance of a 160 L anaerobic biofilm single-stage reactor in treating FW. The reactor was operated at different hydraulic retention times (HRTs) of 124, 62, and 35 days under mesophilic conditions. The maximum biogas and methane yield achieved was 0.934 L/g VSadded and 0.607 L CH4/g VSadded, respectively, at an HRT of 124 days. When HRT decreased to 62 days, the volatile fatty acid (VFA) and ammonia accumulation increased rapidly whereas pH, methane yield, and biogas yield decreased continuously. The decline in biogas production was likely due to shock loading, which resulted in scum accumulation in the reactor. A negative correlation between biogas yield and volatile solid (VS) removal efficiency was also observed, owing to the floating scum carrying and urging the sludge toward the upper portion of the reactor. The highest VS (79%) and chemical oxygen demand (COD) removal efficiency (80%) were achieved at an HRT of 35 days. Three kinetic models—the first-order kinetic model, the modified Gompertz model, and the logistic function model—were used to fit the cumulative biogas production experimental data. The kinetic study showed that the modified Gompertz model had the best fit with the experimental data out of the three models. This study demonstrates that the stability and performance of the anaerobic digestion (AD) process, namely biogas production rate, methane yield, intermediate metabolism, and removal efficiency, were significantly affected by HRTs.

scholarly journals A comparative analysis of biogas production from tomato bio-waste in mesophilic batch and continuous anaerobic digestion systems

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248654
Author(s):  
Árpád Szilágyi ◽  
Attila Bodor ◽  
Norbert Tolvai ◽  
Kornél L. Kovács ◽  
László Bodai ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Corn Stover ◽  
Tomato Plant ◽  
Plant Biomass ◽  
Biogas Production ◽  
Industrial Wastes ◽  
Agricultural Activity ◽  
Plant Materials ◽  
Biogas Yield ◽  
Tomato Waste

Annually, agricultural activity produces an enormous amount of plant biomass by-product. Many studies have reported the biomethane potential of agro-industrial wastes, but only a few studies have investigated applying the substrates in both batch and continuous mode. Tomato is one of the most popular vegetables globally; its processing releases a substantial amount of by-product, such as stems and leaves. This study examined the BMP of tomato plant (Solanum lycopersicum Mill. L. cv. Alfred) waste. A comparative test revealed that the BMPs of corn stover, tomato waste,and their combination were approximately the same, around 280 mL methane/g Volatile Solid. In contrast, the relative biogas production decreased in the presence of tomato waste in a continuous mesophilic anaerobic digestion system; the daily biogas productions were 860 ± 80, 290 ± 50, and 570 ± 70 mL biogas/gVolatile Solid/day in the case of corn stover, tomato waste, and their mixture, respectively. The methane content of biogas was around 46–48%. The fermentation parameters of the continuous AD experiments were optimal in all cases; thus, TW might have an inhibitory effect on the microbial community. Tomato plant materials contain e.g. flavonoids, glycoalkaloids (such as tomatine and tomatidine), etc. known as antimicrobial and antifungal agents. The negative effect of tomatine on the biogas yield was confirmed in batch fermentation experiments. Metagenomic analysis revealed that the tomato plant waste caused significant rearrangements in the microbial communities in the continuously operated reactors. The results demonstrated that tomato waste could be a good mono-substrate in batch fermentations or a co-substrate with corn stover in a proper ratio in continuous anaerobic fermentations for biogas production. These results also point to the importance of running long-term continuous fermentations to test the suitability of a novel biomass substrate for industrial biogas production.

The Effect of Alkali Pretreatment of Rice Straw for Anaerobic Digestion

2011 ◽  
Vol 347-353 ◽  
pp. 2555-2558
Author(s):  
Ping Ai ◽  
Yuan Yuan Wang ◽  
Yan Lin Zhang ◽  
Wu Li ◽  
Shui Ping Yan
Keyword(s):  
Anaerobic Digestion ◽  
Rice Straw ◽  
Crop Residues ◽  
Methane Yield ◽  
Alkali Pretreatment ◽  
Efficient Utilization ◽  
Biogas Yield

The anaerobic digestion is an efficient utilization way of crop residues and alkali pretreatment are often used to enhance the degradation. Alkali pretreatment based on Ca(OH)2addition of rice straw was studied.The tests of 3 g/l, 9 g/l Ca(OH)2 addition had an significant effect on enhancing solubilization and rapid acidification, the results were 1521.2 gCOD/l and 935 ml biogas yield of 3 g/l Ca(OH)2addition, 1600.7 gCOD/l and 1200 ml biogas yield of 9 g/l Ca(OH)2addition , compared to 405.5 gCOD/l and 1162 ml of control( 0 g/l Ca(OH)2addition) . The results also showed that tests of 15 g/l , 21 g/l of Ca(OH)2addition were entirely inhibited to biogas yield. The result of the present work implied that although alkali pretreatment to rice straw can significantly enhance solubilization, the inhibition to methane yield was liable to occur.

scholarly journals Exploitation of Mowed Grass from Green Areas by Means of Anaerobic Digestion: Effects of Grass Conservation Methods (Drying and Ensiling) on Biogas and Biomethane Yield

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3244 ◽  
Author(s):  
Chiumenti ◽  
Pezzuolo ◽  
Boscaro ◽  
da Borso
Keyword(s):  
Anaerobic Digestion ◽  
Landscape Management ◽  
Agricultural Practices ◽  
Methane Yield ◽  
Biogas Yield ◽  
Conservation Treatment ◽  
Green Areas ◽  
Good Potential ◽  
Valuable Product ◽  
Daily Load

Grass from landscape management or from agricultural practices is currently destined mainly for composting, with the production of a valuable product; however, this process demands energy. Anaerobic digestion, instead, represents an energy-positive process that results in the production of fuel, biogas, and a fertilizer, namely digestate. Previous tests for the evaluation of biogas yield from freshly harvested grass gave promising results. However, for a practical exploitation of this resource, appropriate conservation is necessary in order to enable the daily load of digesters while reducing the loss of organic matter. The present work is focused on the evaluation of biogas and methane yield from dried and ensiled grass (without conditioning) in order to assess eventual biogas potential losses in comparison to digested fresh grass. Tests were performed with grass collected from riverbanks (Veneto, Northern Italy) in batch, lab scale digesters. Dry and ensiled grass showed a good potential for exploitation in the anaerobic digestion process, reaching biogas yields of 565.9 and 573.4 NL∙kgVS−1, respectively. Compared to the biogas yield of 639.7 NL∙kgVS−1 of the fresh grass, the conservation treatment determined yield reductions of 11.5% and 10.4% for dried and ensiled grass, respectively. However, considering the methane yields, conservation treatments showed lower reductions, amounting to 4.8% for dry grass and 0.5% for ensiled grass; presumably the higher concentration of organic acids in ensiled grass determined a higher methane content in biogas and the consequently lower reduction of methane yield.

ISSUES OF GREENING THE LAND USE SYSTEM IN THE RUSSIAN FEDERATION

2020 ◽  
Keyword(s):  
Crop Rotation ◽  
Crop Yields ◽  
Plant Protection ◽  
Arable Land ◽  
Farming System ◽  
Perennial Grasses ◽  
Soil Protection ◽  
Anthropogenic Pressure ◽  
Strict Adherence ◽  
The Creation

Soil protection in agrolandscapes is especially necessary in conditions of intensification of production and increasing anthropogenic pressure on them. This complex should fit into the landscape farming system. The more intensive the load on the land in the farm, the higher the level of soil protection against destruction. The article notes that raising soil fertility, increasing crop yields and ecological environmental improvement are possible only on the basis of agrolandscape farming system, which allows to establish the correct ratio of arable land, meadows and forests. The transition to such a system of agriculture requires: development of a project for agrolandscape land management with a set of anti-erosion measures for each farm; adjusting the structure of sown areas taking into account market conditions, that is, increasing the area of productive crops in demand (winter and spring wheat, perennial grasses), which in combination with occupied and green manure pairs determine the structure of biologized crop rotation; widespread use of legumes (peas, vetch) as factors in the biologization of agriculture. The efficiency of expanding the area of perennial grasses to 25 % of arable land in some areas of the Non-Chernozem region and the Belgorod region is shown. Here, techniques that increase the efficiency of arable land are based on strict adherence to crop rotation with legumes, the use of adaptive varieties, and the use of biologized fertilizer and plant protection systems. It is noted that the creation of a system of shelterbelts makes it possible to reduce the cost of planting and growing them in comparison with single forest belts and what is very important for farmers is to sharply increase the return on their exploitation in the form of increased increases in crop yields. The creation of forest-sized landscapes will improve the environmental conditions for the cultivation of crops.

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