Estimation of the Biogas Production Potential of Specific Food Waste Mixtures
摘要
Nowadays, there is growing interest in anaerobic digestion of energy crops, leftovers, and wastes to lower greenhouse gas emissions and promote a sustainable growth of the energy source through biogas. The objective of this experiment was to test the biogas production potential from a mixture of food waste through anaerobic batch syringe (reactor) test method. An initial 3-mL volume of feed substrates (C and D) was used. Substrate C is made by mixing yeast and cream, while substrate D was a mixture of apple juice, yeast, and cream. After 7 days measurement, refeeding of substrates to the sample was done. The experiment is performed in series of 100-mL medical syringes which are used as small anaerobic digesters, AD, at 35 °C for all syringes before refeeding. After refeeding some syringes were tested at ambient temperature to see the effect of temperature. A better volume of biogas was obtained when the refeeding value was higher, and the temperature was 35 °C (C2_30_1). The average biogas production at the end of the day for C2_30_1 was 310 mL. On the other hand, lower biogas production was recorded in D2_10_1 (only 90 mL). That is, D2_10_1 is less than C2_30_1 by 70.9%. The refeeding volume of sample C2_30_1 was 10 mL, and a 3-mL volume refeed was used for D2_10_1. Different factors can affect biogas production potential. S/I ratio, inoculum adaptation, and substrate composition were the major factors identified affecting the biogas production.