| Title | Anaerobic mono-and co-digestion of fruit and vegetable residues: Effects on biogas yield and biofertilizer |
|---|---|
| ID_Doc | 9377 |
| Authors | Hinterholz, B; Costa, MNSSD; de Lucas, J Jr; Pereira, ED; Buligon, EL; de Lima, JC; Marostica, R |
| Title | Anaerobic mono-and co-digestion of fruit and vegetable residues: Effects on biogas yield and biofertilizer |
| Year | 2024 |
| Published | Revista Brasileira De Engenharia Agricola E Ambiental, 28.0, 11 |
| Abstract | The proper disposal of fruit and vegetable waste is essential to promote environmental sustainability, reduce the carbon footprint, improve soil quality, and contribute to the transition to a circular economy. This study examined the impact of incorporating dairy cattle wastewater (DCWW) into anaerobic co-digestion with fruit and vegetable residues and utilization of the resulting biofertilizer as a diluent in the anaerobic mono-digestion of fruit and vegetable residues (recycle). The specific biogas and methane production and the agronomic quality of the biofertilizer were evaluated in a semi-continuous trial. Two startup strategies were employed: initially, the reactors were entirely fed with inoculum (biofertilizer derived from DCWW), and fruit and vegetable residue feedstock was gradually introduced. Anaerobic co-digestion of fruit and vegetable residues with DCWW yielded the highest specific production of biogas and methane at 720 and 436 L kg-1 of volatile solids (VS), respectively. The addition of DCWW increases fruit and vegetable residue alkalinity by 249% and reduces the volatile acidity by 83.4%. Anaerobic mono-digestion of fruit and vegetable residues enhances macronutrient recovery in the biofertilizer through recycle. Logistically, directing fruit and vegetable residues to rural areas for anaerobic co-digestion with DCWW promotes agricultural biofertilizer use. |
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