The paper proposes an online estimation of biogas production for a household
digester. The specific growth rate of aggregated biomass of a standard chemostat is estimated
from the online measurements of dilution rate and biogas flow rate. That estimation is based
upon usual 1-stage model without additional assumption on the online availability of neither
yield coefficients nor concentrations of biomass or substrate. Next, ADM1 is used, in an
empirical way, to identify yield coefficients. Finally, biomass concentration is estimated from
the 1-stage model equations allowing the reconfirmation of biogas flow rate measurements at
a 4m3 digester in a rural area in Burkina Faso.

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