Hi all,
Someone please give me details on quantity of Bio-gas produced from 1 ton oragnic waste, also energy benefits in the form of eletricity (kW), LPG replacement and manure after digestion of waste from bio-gas unit with calculations.
I have around 37 tonnes of waste, so got to design a project on this
Please send me information to indi.rd@gmail.com.
it will help me a lot for my studies.
Replies
Thank You very Much Sir.
ProfSURESHKUMAR.S said:
It depends on type of waste too..
The amount of biogas you can extract from your organic waste depends on the waste itself and the design of the digester system.Some digesters can yield 20 m3 of biogas per tonne of waste while others can yield as much as 800 m3 per tonne.It all depends on waste quality, digester design and proper operation of the system.Any organic waste has the ability to produce biogas: human excreta, manure, animal slurry, fruit and vegetable waste, slaughterhouse waste, meat packing waste, dairy factory waste, brewery and distillery waste, etc.Fiber rich wastes like wood, leaves, etc. make poor feedstocks for digesters as they are difficult to digest.[please visit the site of CSIR-NIIST for one of our designs by scientist in the environment tech group-Dr.Manilal].Biogas is typically composed of 60% methane and 40% CO2. It is similar to natural gas which is composed of 99% methane.interestingly,
the amount of waste going in the digester is almost equal to the amount coming out. However the quality of the waste is altered for the better (less odor, better fertilizer, organic load reduced, less polluting).Waste coming out of the digester can be separated (solid/liquid):the solid part can be composted and the liquid part can be used as liquid fertilizer or can be treated further and disposed.[csir-niist DESIGN has some unique features which you may discuss with Dr.Manilal]
Each cubic meter (m3) of biogas contains the equivalent of 6 kWh of calorific energy.However, when we convert biogas to electricity, in a biogas powered electric generator, we get about 2 kWh of useable electricity, the rest turns into heat which can also be used for heating applications.2 kWh is enough energy to power a 100 W light bulb for 20 hours.
Methane capture has benefits related to climate change impacts too[methane to market ].
Methane has a greenhouse gas (GHG) heating factor 21 times higher than CO2.
Combustion of biogas converts methane into CO2 and reduces the GHG impact by over 20 times.
By extracting methane out of waste and using it to produce heat and/or electricity we ensure that the waste will not degrade in an open environment therefore reducing direct methane atmospheric emissions. Moreover, the energy provided by the biogas is likely to displace fossil fuel which is the main contributor to GHG emissions.Biogas energy is considered carbon neutral, since carbon emitted by its combustion comes from carbon fixed by plants (natural carbon cycle)