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______________ is a major factor in determining the methane yield and methane production rates from the digestion of biomass.

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______________ is a major factor in determining the methane yield and methane production rates from the digestion of biomass.

(a) Seeding

(b) Contamination

(c) Substrate composition

(d) Moisture content

I have been asked this question in final exam.

My query is from Problem involved in Biogas Production in division Biomass Energy of Energy Engineering

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The correct choice is (c) Substrate composition

The best I can explain: Substrate composition is a major factor in determining the methane yield and methane production rates from the digestion of biomass. Techniques to determine the compositional characteristics of the feedstock are available, while parameters such as solids, elemental, and organic analyses are important for digester design and operation.

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