| Title | Sustainable bioprocess combining subcritical water pretreatment followed by anaerobic digestion for the valorization of jabuticaba (Myrciaria cauliflora) agro-industrial by-product in bioenergy and biofertilizer |
|---|---|
| ID_Doc | 21023 |
| Authors | da Rosa, RG; Sganzerla, WG; Barroso, TLCT; Castro, LEN; Berni, MD; Forster-Carneiro, T |
| Title | Sustainable bioprocess combining subcritical water pretreatment followed by anaerobic digestion for the valorization of jabuticaba (Myrciaria cauliflora) agro-industrial by-product in bioenergy and biofertilizer |
| Year | 2023 |
| Published | |
| Abstract | The management of agri-food by-products has received worldwide attention due to concerns about the environmental impacts caused by incorrect deposition. This study presented a sustainable bioprocess combining subcritical water pretreatment (SWP) followed by semi-continuous anaerobic digestion (AD) for the valorization of jabuticaba (Myrciaria cauliflora) agro-industrial by-product in bioenergy and agricultural fertilizer. The SWP was conducted at 180 degrees C, 15 MPa, water flow rate of 10 mL min-1, solvent to feed of 22.5 g g-1, and a kinetic time of 45 min. The AD process was operated in semi-continuous mode under mesophilic and methanogenic conditions. The results demonstrated that the hydrolysate presented glucose (5.78 g L-1), fructose (3.63 g L-1), arabinose (1.82 g L-1), and cellobiose (1.28 g L-1) as major compounds. The use of pretreated jabuticaca byproduct increased the methane yield (239.04 L CH4 kg-1 TVS) in the designed bioprocess combining SWP and AD when compared to the AD without pretreatment (42.31 L CH4 kg-1 TVS). The methane produced in the bioprocess with SWP followed by AD can generate 543 kWh t-1 of electricity and 2,243.17 MJ t-1 of heat, avoiding a total of 177.54 kg CO2-eq t-1. The digestate generated after AD can be used as a biofertilizer up to a concentration of 0.3 g L-1, without toxic effects on the germination of Lactuca sativa. Finally, the sustainable bioprocess designed could be an alternative to the management of jabuticaba by-product within a circular economy framework, producing bioenergy and agricultural fertilizer that can reduce greenhouse gas emissions and environmental pollution in the food industry. |
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