Which feedstock characteristic is expressed by the 'C:N ratio' and is critical for optimizing anaerobic digestion performance?
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A
Carbon-to-nitrogen ratio, which ideally should be 20:1 to 30:1 for stable digestion
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B
Cellulose-to-nitrogen ratio controlling enzymatic hydrolysis
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C
Caloric-to-nutrient ratio for biogas yield prediction
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D
Combustion-to-nitrogen ratio for emission modeling