The results obtained in this study suggest that co-digestion of RS with KW and PM is a promising approach for improving biogas production. The biogas yields increased by 55.2%, 71.6%, and 46.6% compared to that from RS alone when the KW/PM/RS ratio was 0:2:1, 0.4:1.6:1, and 0.8:1.2:1, respectively. The highest biogas yield of 674.4 L/kg VS added and methane yield of 383.9 L/kg VS added was obtained when KW/PM/RS = 0.4:1.6:1. Severe VFA inhibition occurred when the proportion of KW in the feedstock accounted for more than 26%. Thus, future work should be focused on avoiding VFA inhibition and improving the stability of the digester systems when KW is added as a co-substrate. This could be feasible via the following two methods: (1) changing the single-stage anaerobic digestion system to a two-stage anaerobic digestion system; (2) reducing the loading rates and using on-line VFA concentration
monitoring to ensure that the VFA concentration is maintained in the desired range.
The results obtained in this study suggest that co-digestion of RS with KW and PM is a promising approach for improving biogas production. The biogas yields increased by 55.2%, 71.6%, and 46.6% compared to that from RS alone when the KW/PM/RS ratio was 0:2:1, 0.4:1.6:1, and 0.8:1.2:1, respectively. The highest biogas yield of 674.4 L/kg VS added and methane yield of 383.9 L/kg VS added was obtained when KW/PM/RS = 0.4:1.6:1. Severe VFA inhibition occurred when the proportion of KW in the feedstock accounted for more than 26%. Thus, future work should be focused on avoiding VFA inhibition and improving the stability of the digester systems when KW is added as a co-substrate. This could be feasible via the following two methods: (1) changing the single-stage anaerobic digestion system to a two-stage anaerobic digestion system; (2) reducing the loading rates and using on-line VFA concentration
monitoring to ensure that the VFA concentration is maintained in the desired range.
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