When I first initiate my digester with zero knowledge about biogas my favourite question was why is there no any gas produced? So you are very lucky if there is gas production by the new digester because carbon dioxide will come out first in the beginning before then methane. You have to understand that biogas is actually mix of several type of gas like carbon dioxide, methane and other inert gas. Along the process of biogas production, in the beginning of chain reaction, acidification will first occurr thus producing carbon dioxide. It is normal to have carbon dioxide in the very beginning. It is a positive sign that your digester is working well and will produce methane a bit later according to the chain reaction. Unless your digester is continuously producing carbon dioxide after months of starting then you have to start worry there might leakage somewhere along digester system.
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