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- Title
Anaerobic mono-and co-digestion of fruit and vegetable residues: Effects on biogas yield and biofertilizer.
- Authors
Hinterholz, Bruna; de M. Costa, Mônica S. S.; de Lucas Junior, Jorge; da S. Pereira, Edilene; Buligon, Eduardo L.; de Lima, Jessica C.; Marostica, Ritieli
- 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.
- Subjects
BIOGAS production; AGRICULTURE; CIRCULAR economy; SUSTAINABILITY; DAIRY cattle
- Publication
Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi, 2024, Vol 28, Issue 11, p1
- ISSN
1807-1929
- Publication type
Article
- DOI
10.1590/1807-1929/agriambi.v28n11e280349