This document provides information about biogas, including its composition, production through fixed dome and floating gas holder biogas plants, advantages as a fuel, uses, and recent developments. Biogas is produced through anaerobic digestion of biomass like animal waste, plant waste, and food waste. It is composed primarily of methane and can be used as a clean fuel for cooking, lighting, electricity generation, and transportation. Fixed dome plants are simpler to construct but more expensive floating gas holder plants require less maintenance. Biogas is a renewable source of energy that can help reduce pollution and provide fertilizer.
Factors affecting Biogas Production: There are several factors such as biogas potential of feedstock, inoculums, nature of substrate, pH, temperature, loading rate, hydraulic retention time (HRT), C:N ratio, volatile fatty acids (VFA), inhibitory substances, etc.
Bioenergy is energy contained in living or recently living biological organisms
Organic material containing bioenergy is known as biomass
Biofuels are renewable transport fuels including:
Bioethanol
Biodiesel
Biogas
Biobutanol
Biomass is the largest renewable energy source in use today
There are two main forms of biomass:
Factors affecting Biogas Production: There are several factors such as biogas potential of feedstock, inoculums, nature of substrate, pH, temperature, loading rate, hydraulic retention time (HRT), C:N ratio, volatile fatty acids (VFA), inhibitory substances, etc.
Bioenergy is energy contained in living or recently living biological organisms
Organic material containing bioenergy is known as biomass
Biofuels are renewable transport fuels including:
Bioethanol
Biodiesel
Biogas
Biobutanol
Biomass is the largest renewable energy source in use today
There are two main forms of biomass:
Clean, efficient source of renewable energy (1)
Made from organic waste
Produces methane
Anaerobic digestion (2)
Replaces non-renewable energy
Digested in an airtight container
In this design, the digester chamber is made of brick masonry in cement mortar. A mild steel drum is placed on top of the digester to collect the biogas produced from the digester. Thus, there are two separate structures for gas production and collection. With the introduction of fixed dome Chinese model plant, the floating drum plants became obsolete because of comparatively high investment and maintenance cost along with other design weaknesses.
Source: https://journalhow.com/
Biomass Energy Resourses; Mechanism of green plant
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Biogas- Types of Biogas plants, factors affecting production
rates, Pyrolysis, Gasifess Types & Classification of vegetable
oils a a liquid fuel and their properties, esterification process,
formation of Biodiesel, Biodiesel & its properties, suitable species
for Biodiesel formation and its cultivation, byproduct formation
during esterification, Biodiesel economics.
Clean, efficient source of renewable energy (1)
Made from organic waste
Produces methane
Anaerobic digestion (2)
Replaces non-renewable energy
Digested in an airtight container
In this design, the digester chamber is made of brick masonry in cement mortar. A mild steel drum is placed on top of the digester to collect the biogas produced from the digester. Thus, there are two separate structures for gas production and collection. With the introduction of fixed dome Chinese model plant, the floating drum plants became obsolete because of comparatively high investment and maintenance cost along with other design weaknesses.
Source: https://journalhow.com/
Biomass Energy Resourses; Mechanism of green plant
photosynthesis, effiency of conversion, solar energy plantation,
Biogas- Types of Biogas plants, factors affecting production
rates, Pyrolysis, Gasifess Types & Classification of vegetable
oils a a liquid fuel and their properties, esterification process,
formation of Biodiesel, Biodiesel & its properties, suitable species
for Biodiesel formation and its cultivation, byproduct formation
during esterification, Biodiesel economics.
Biogas is an environmentally-friendly, renewable energy source. It's produced when organic matter, such as food or animal waste, is broken down by microorganisms in the absence of oxygen, in a process called anaerobic digestion.
Introduction to biogas technology, History, gas composition, types of digests, sizing units, gas yield, operation and maintenance of system, Advantages & Failures, Cost benefit analysis
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Although Artemia has been known to man for centuries, its use as a food for the culture of larval organisms apparently began only in the 1930s, when several investigators found that it made an excellent food for newly hatched fish larvae (Litvinenko et al., 2023). As aquaculture developed in the 1960s and ‘70s, the use of Artemia also became more widespread, due both to its convenience and to its nutritional value for larval organisms (Arenas-Pardo et al., 2024). The fact that Artemia dormant cysts can be stored for long periods in cans, and then used as an off-the-shelf food requiring only 24 h of incubation makes them the most convenient, least labor-intensive, live food available for aquaculture (Sorgeloos & Roubach, 2021). The nutritional value of Artemia, especially for marine organisms, is not constant, but varies both geographically and temporally. During the last decade, however, both the causes of Artemia nutritional variability and methods to improve poorquality Artemia have been identified (Loufi et al., 2024).
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Salas, V. (2024) "John of St. Thomas (Poinsot) on the Science of Sacred Theol...Studia Poinsotiana
I Introduction
II Subalternation and Theology
III Theology and Dogmatic Declarations
IV The Mixed Principles of Theology
V Virtual Revelation: The Unity of Theology
VI Theology as a Natural Science
VII Theology’s Certitude
VIII Conclusion
Notes
Bibliography
All the contents are fully attributable to the author, Doctor Victor Salas. Should you wish to get this text republished, get in touch with the author or the editorial committee of the Studia Poinsotiana. Insofar as possible, we will be happy to broker your contact.
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3. Biogas
• Biogas is a clean and efficient fuel.
• It is a mixture of:
– Methane (CH4)
– Carbon dioxide (CO2)
– Hydrogen (H2)
– Hydrogen sulphide (H2S)
• The chief constituent of biogas is methane (65%).
4.
5. Production of Biogas - The biogas plants
There are two types of biogas plants in usage for
the production of biogas. These are:
• The fixed- dome type of biogas plant
• The floating gas holder type of biogas plant
7. Raw materials required
• Forms of biomass listed below may be used along
with water.
• Animal dung
• Poultry wastes
• Plant wastes ( Husk, grass, weeds etc.)
• Human excreta
• Industrial wastes(Saw dust, wastes from food
processing industries)
• Domestic wastes (Vegetable peels, waste food
materials)
8. Construction
The biogas plant is a brick and cement structure having
the following five sections:
• Mixing tank present above the ground level.
• Inlet tank: The mixing tank opens underground into
a sloping inlet chamber.
• Digester: The inlet chamber opens from below into
the digester which is a huge tank with a dome like
ceiling. The ceiling of the digester has an outlet with
a valve for the supply of biogas.
• Outlet tank: The digester opens from below into an
outlet chamber.
• Overflow tank: The outlet chamber opens from the
top into a small over flow tank.
9. Working of Fixed Dome type Biogas Plant
• The various forms of biomass are mixed with an equal
quantity of water in the mixing tank. This forms the slurry.
• The slurry is fed into the digester through the inlet chamber.
• When the digester is partially filled with the slurry, the
introduction of slurry is stopped and the plant is left unused
for about two months.
• During these two months, anaerobic bacteria present in the
slurry decomposes or ferments the biomass in the presence
of water.
• As a result of anaerobic fermentation, biogas is formed,
which starts collecting in the dome of the digester.
10. Cont..
• As more and more biogas starts collecting, the pressure
exerted by the biogas forces the spent slurry into the
outlet chamber.
• From the outlet chamber, the spent slurry overflows into
the overflow tank.
• The spent slurry is manually removed from the overflow
tank and used as manure for plants.
• The gas valve connected to a system of pipelines is
opened when a supply of biogas is required.
• To obtain a continuous supply of biogas, a functioning
plant can be fed continuously with the prepared slurry.
11.
12. Advantages of fixed dome type of
biogas plant
• Requires only locally and easily available
materials for construction.
• Inexpensive.
• Easy to construct.
14. Construction
The floating gas holder type of biogas plant has the following
chambers/ sections:
• Mixing Tank - present above the ground level.
• Digester tank - Deep underground well-like structure. It is
divided into two chambers by a partition wall in between.
• It has two long cement pipes
i) Inlet pipe opening into the inlet chamber for introduction of
slurry.
ii) Outlet pipe opening into the overflow tank for removal of spent
slurry.
• Gas holder - an inverted steel drum resting above the
digester. The drum can move up and down i.e., float over
the digester. The gas holder has an outlet at the top which
could be connected to gas stoves.
• Over flow tank - Present above the ground level.
15.
16. Working
• Slurry (mixture of equal quantities of biomass and water)
is prepared in the mixing tank.
• The prepared slurry is fed into the inlet chamber of the
digester through the inlet pipe.
• The plant is left unused for about two months and
introduction of more slurry is stopped.
• During this period, anaerobic fermentation of biomass
takes place in the presence of water and produces biogas
in the digester.
• Biogas being lighter rises up and starts collecting in the
gas holder. The gas holder now starts moving up.
17. Cont..
• The gas holder cannot rise up beyond a certain level. As
more and more gas starts collecting, more pressure begins
to be exerted on the slurry.
• The spent slurry is now forced into the outlet chamber
from the top of the inlet chamber.
• When the outlet chamber gets filled with the spent slurry,
the excess is forced out through the outlet pipe into the
overflow tank. This is later used as manure for plants.
• The gas valve of the gas outlet is opened to get a supply of
biogas.
• Once the production of biogas begins, a continuous supply
of gas can be ensured by regular removal of spent slurry
and introduction of fresh slurry.
18. Disadvantages of floating gas holder
type biogas plant
• Expensive
• Steel drum may rust
• Requires regular maintenance
19. Advantages of biogas as a fuel
• High calorific value
• Clean fuel
• No residue produced
• No smoke produced
• Non polluting
• Economical
• Can be supplied through pipe lines
• Burns readily - has a convenient ignition
temperature
20. Uses of biogas
• Domestic fuel
• For street lighting
• Generation of electricity
• If compressed, it can replace compressed
natural gas for use in vehicles
22. Advantages of biogas plants
• Reduces burden on forests and fossil fuels
• Produces a clean fuel - helps in controlling air
pollution
• Provides nutrient rich (N & P) manure for
plants
• Controls water pollution by decomposing
sewage, animal dung and human excreta.
23. Limitations of biogas plants
• Initial cost of installation of the plant is high.
• Number of cattle owned by an average family
of farmers is inadequate to feed a biogas
plant.
24. Recent Developments
• With the many benefits of biogas, it is starting to become a
popular source of energy and is starting to be used in the
United States more.
• On 5 October 2010, biogas was injected into the UK gas grid
for the first time. As of September 2013, there are about 130
non-sewage biogas plants in the UK.
• Germany is Europe's biggest biogas producer and the market
leader in biogas technology.
• To create awareness and associate the people interested in
biogas, the Indian Biogas Association was formed. India's
Ministry of New and Renewable Energy offers some subsidy
per model constructed.
25. Conclusion
Biogas is a clean source of energy. Biogas plants
have been in operation for a long period of time,
especially in rural areas around the globe. The
research organizations should focus on newer
efficient low cost designs. The governments can
play important role by introducing different legal
frameworks, education schemes and the
availability of technology and simultaneously
creating more awareness and providing more
subsidies.