Time duration required to produce biogas from cow dug.
Dear Vigneshwaran PV,
It depends on several factors, however, in the best conditions: 1kg cow dung produces 250g of biogas (methane gas) over 24hrs. (55-65% from the gas is metane, CH4).
For more information, please use the following link:
http://www.ipcc-nggip.iges.or.jp
Hoping this will be helpful,
Rafik
Please see this question:
https://www.researchgate.net/post/How_much_methane_than_can_be_produced_per_1_kg_of_cow_manure_using_anaerobic_digestion
See papers by Aslanzadeh and Taherzadeh.
http://152.1.0.246/index.php/BioRes/article/view/BioRes_06_4_5193_Aslanzadeh_TS_Pretreat_Traw_Manure_Biogas
You can get about 250 normal litres per kg volatile solids. VS is about 18% of wet fresh manure.
It takes a long time to get that much. The digestion in a batch reactor follows a simple exponential rate law. You can find rate constants in the literature. Just looking at Aslanzadeh's paper I guess something like this:
G = 250 (1 - exp (-0.1 T))
Here G is the number of normal litres CH4 produced after T days from one kg of VS.
It depends on different factors such as the digester type, the biomass feedstock and the temperature etc. please read the publication given in the below link.
https://www.researchgate.net/publication/291421573_Bioenergy_from_anaerobic_digestion_in_Pakistan_Potential_development_and_prospects
Article Bioenergy from anaerobic digestion in Pakistan: Potential, d...
as it said depends on temp. mix. manure. TS
may be one day or 10 days to start
As you want to know the required anaerobic time for cow dung, so need to worry about TS, VS variation, and mixture strength, because all these have a certain value for cow dung. Also as you have no choice of temperature in your question, hence consider room temperature. According to Ashrf 1 day is impossible. Perfect time is 7-10 days.
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