Gobar Gas Plant construction. Class IX. Bio gas for village Bio gas is a clean unpolluted and cheap source of energy in rural areas. It consists of %. Biogas Plant with Slurry Tank. Success Story. RKVY Dairy Project. (Skill Empowerment Of Women In Dairy Cattle Management). Gobar gas Plants Improve Life. DESIGN OF BIOGAS PLANT. Bio-gas Project, LGED. Introduction: Biogas can be obtained from any organic materials after anaerobic fermentation by three.
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After all, a biogas plant can only help to solve the problems of the future if it works ! He for his part is then prepared to adapt to the needs of the biogas plant. + Khaad = Rs =Total income =1, Rs/day. Invest Pay Back: Gobar Gas Plant Cost = 7,50, Gas Bill saving= 1, Rs/Day. Investment Pay back = 20 . For Biogas plants, technology from EnviTec Biogas AG will be used. EnviTec Biogas AG has established itself as one of Europe's leading biogas plant .
But in that case, they consume a considerable amount of diesel. Gas Motors with spark ignition Otto system can operate on biogas alone. In practice, a small amount of petrol gasoline is often used to start the engine. Especially in Germany, these engines have advantages as they do not need additional fossil fuels that would lead to lower feed-in tariffs according to the Renewable Energy Law EEG. They are very small and can meet the strict exhaust emissions requirements of the California Air Resources Board CARB for operation on landfill and digester gases.
Small biogas turbines with power outputs of kW are available in the market. However, they are rarely used for small-scale applications in developing countries. They are expensive and due to their spinning at very high speeds and the high operating temperatures, the design and manufacturing of gas turbines is a challenging issue from both the engineering and material point of view.
Maintenance of such a turbine is very different from well-known maintenance of a truck engine and therefore requires specific skills. Today, experience of the use of combustion motors to produce electricity from biogas is extensive; this can be regarded as a proven standard technology. Over 4, biogas plants with internal combustion motors are in operation in Germany.
However, it has taken lengthy and determined effort to make this technology as durable and reliable as it is today. Internal combustion motors have high requirements in terms of fuel quality. In theory, most engines originally intended for cars, trucks, ships or stationary use can run on biogas as fuel and are available almost everywhere within a power range between 10 and kW.
This holds true especially in the case of dual fuel use. The water vapour content can be reduced by condensation in the gas storage or on the way to the engine. The reduction of the hydrogen sulphide H2S content in the biogas can be addressed via a range of technical methods.
These can be classified as chemical, biological, or physical and divided into internal and external methods.
Step 2: Selection of Tanks
Much experimentation has been carried out in the last two decades. The injection of a small amount of oxygen air into the headspace of the storage fermenter leads to oxidation of H2S by microorganisms and hence the elimination of a considerable part of the sulphur from the gaseous phase. This is the most frequently used method for desulphurisation. However, the right proportioning of air still seems to be a challenge.
Another option is external chemical treatment in a filter.
The active material may be: 1. This process is reversible and the filter can be regenerated by adding oxygen. Activated carbon: Certain companies provide activated carbon filters as a standard component in their gensets. Standard quality sulphur filters and filter material can be downloadd on the market.
Energy requirement for heating the slurry Energy required for heating the slurry in digester can be calculated by using the formulae below. The unit of energy is Kj Kilo joule . Average is around 1 month. Gauge the Amount of material kept in the digester per day and then multiply by 30 to calculate the size of digester. Examples For examples of countries where electricity is generated from biogas, please see Generating Electricity from Biogas - Examples Overall Appraisal Energy Production Potential Appropriate feedstock for electricity-generating biogas plants is available in adequate quantity in many countries.
Small and medium-size biogas plants could provide a considerable contribution to national electricity generation in such countries. However, in comparison to industrialised countries, only very few small and medium sized biogas plants are used for electricity generation in Africa, Latin America and even Asia.
Electricity production from biogas can be a very efficient method for producing electricity from a renewable energy source. However, this applies only if the emerging heat from the power generator can be used in an economically and ecologically sound way.
Bigger biogas plants are generally more cost-efficient than smaller ones. However, electricity generation from biogas is a technology appropriate even for relatively small applications in the range of kW. The techno-logical difficulties with which small biogas plants were confronted two decades ago have been resolved. Their influence and acting has to be governed to gain all advantages this new source of energy is offering. Finally biogas will furthermore play an important role in the German renewable energy supply if good governance is focused.
In the last 2—3 decades, research organisations with a focus on rural energy security have enhanced the design of the systems resulting in newer efficient low cost designs such as the Deenabandhu model. The Deenabandhu Model is a new biogas-production model popular in India.
Deenabandhu means "friend of the helpless.
It is constructed using bricks or by a ferrocement mixture. In India, the brick model costs slightly more than the ferrocement model; however, India's Ministry of New and Renewable Energy offers some subsidy per model constructed.
Also the heavy subsidies provided by the successive governments in promoting LPG as a domestic cooking fuel has become a financial burden renewing the focus on biogas as a cooking fuel alternative in urban establishments.
This has led to the development of prefabricated digester for modular deployments as compared to RCC and cement structures which take a longer duration to construct. Renewed focus on process technology like the Biourja process model  has enhanced the stature of medium and large scale anaerobic digester in India as a potential alternative to LPG as primary cooking fuel.
In India, Nepal, Pakistan and Bangladesh biogas produced from the anaerobic digestion of manure in small-scale digestion facilities is called gobar gas ; it is estimated that such facilities exist in over 2 million households in India, 50, in Bangladesh and thousands in Pakistan, particularly North Punjab, due to the thriving population of livestock.
The digester is an airtight circular pit made of concrete with a pipe connection. The manure is directed to the pit, usually straight from the cattle shed.
The pit is filled with a required quantity of wastewater. The gas pipe is connected to the kitchen fireplace through control valves. The combustion of this biogas has very little odour or smoke. Owing to simplicity in implementation and use of cheap raw materials in villages, it is one of the most environmentally sound energy sources for rural needs.
Advantages and Disadvantages of Biogas
One type of these system is the Sintex Digester. Some designs use vermiculture to further enhance the slurry produced by the biogas plant for use as compost.
In Nepal, the government provides subsidies to build biogas plant at home. China[ edit ] The Chinese have experimented with the applications of biogas since Around , China had installed 6,, digesters in an effort to make agriculture more efficient.
During the last years the technology has met high growth rates. This seems to be the earliest developments in generating biogas from agricultural waste. The exponential growth of energy supply caused by rapid economic development and severe haze condition in China have led biogas to become the better eco-friendly energy for rural area.
In Qing county , Hebei Province, the technology of using crop straw as main material to generate biogas is currently developing. The annual biogas output has increased to billion cubic meter in This is caused by the lack of heat control technology for digesters thus the co-digestion of different feedstock failed to complete in the cold environment.
This manure has to be collectable to mix it with water and feed it into the plant. Toilets can be connected. Another precondition is the temperature that affects the fermentation process.
This makes the technology for small holders in developing countries often suitable. Although the biogas plants available today are able to meet some energy needs, many governments are not willing to invest in the sector. Contains Impurities After refinement and compression, biogas still contains impurities. If the generated bio-fuel was utilized to power automobiles, it can corrode the metal parts of the engine. This corrosion would lead to increased maintenance costs.
The gaseous mix is much more suitable for kitchen stoves, water boilers, and lamps. Effect of Temperature on Biogas Production Like other renewable energy sources e.
In cold climates, digesters require heat energy to maintain a constant biogas supply. Less Suitable For Dense Metropolitan Areas Another biogas disadvantage is that industrial biogas plants only makes sense where raw materials are in plentiful supply food waste, manure.
For this reason, biogas generation is much more suitable for rural and suburban areas.Examples For examples of countries where electricity is generated from biogas, please see Generating Electricity from Biogas - Examples Overall Appraisal Energy Production Potential Appropriate feedstock for electricity-generating biogas plants is available in adequate quantity in many countries.
How to Build a Medium Sized Biogas Plant
This seems to be the earliest developments in generating biogas from agricultural waste. Energy requirement for heating the slurry Energy required for heating the slurry in digester can be calculated by using the formulae below.
If the local gas network allows, the producer of the biogas may use their distribution networks. Internal Combustion Engines Diesel Engines operate on biogas only in dual fuel mode.
Besides the cases described here, we know of further examples from other GTZ projects e. The presence of gases other than methane may in fact spoil the combustion system when used straight out of the production. For the user, biogas provides clean cooking energy, reduces indoor air pollution, and reduces the time needed for traditional biomass collection, especially for women and children.
In such cases, the electricity from biogas plants can be compared to the price of electricity provided through the national grid or the price of bottled LPG. In contrast to natural gas, biogas is characterized by a high knock resistance and hence can be used in combustion motors with high compression rates.
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