Dear Mr. Shrestha,
Namaskar!

In continuation to our previous e-mail, here is our response to your question No.3:

>What is the relation between efficiency of Biogas production and
>fertility of effluent/compost?

With high efficiency of gas production, we can imagine that the system works well as microbes will be more active to carry out degradation of the substrates. Hence, good quality effluent/compost is produced as fertilizer. On the other hand, if the efficiency of gas production is low, the substrates are not digested properly (microbe will be less active) and therefore, the effluent/compost would be of inferior quality with respect to the nutrient content.

Best regards,

Amrit & Upendra