| Popis: |
Anaerobic digestion (AD) is an effective method for treating organic waste. However, the performance of anaerobic reactors needs to be improved and comprehensively analyzed. This study proposed a ternary co-feedstock strategy for thermophilic anaerobic co-digestion of tomato plant residue, cattle manure, and food waste. The effects of changing the feedstock composition, feedstock-to-inoculum ratio, and total solids (TS) content were investigated. Among the tested mixtures, a ternary mixture of 60% tomato plant residue, 20% cattle manure, and 20% food waste with a feedstock-to-inoculum ratio of 0.7 gave the highest cumulative biogas (3.230 L), methane yield (2.575 L), methane content (79.71%), co-digestion performance index (1.65) and volatile solids (VS) removal rate (60.59%). Changing the feedstocks compositions caused changes in the specific biogas yield and specific methane yield. In tests with TS contents of 5%, 10%, 15%, and 20%, a higher TS content increased biogas and methane production because of increases in the amount of the biodegradable fraction in the reactor. However, there was a risk of volatile fatty acid overloading and a decrease in the VS removal rate because of inefficient decomposition of the high total solids content by microbes in the inoculum. |
