Abstract
Composting is a biotechnological process that decomposes plant waste into soil-enriching products through microbial activity. Control of parameters such as temperature, humidity and aeration is crucial for an optimal process, which typically takes months. To optimize this, beneficial microorganisms are employed (bioaugmentation). Two compost setups were conducted using lignocellulosic material: one open to the outdoors and the other closed. Both comprised of dry leaves (58 %), fruit peels (12 % banana and papaya), and water (30 %). Parameters were monitored every 2 days for 2 months, and samples were analyzed after seven months. Microorganisms were characterized in Gram-positive and Gram-negative strains. Subsequently, API tests were employed for identification. Four different microorganisms were inoculated individually in other previous described open setups. Physiochemical analysis revealed a final C/N ratio of 45 for uninoculated compost. Inoculated compost, particularly with Chromobacterium violaceum and Pseudomonas luteola, showed a reduced C/N due to their growth, while Paenibacillus alvei and Lactobacillus collinoides improved phosphorus solubilization and reduced soluble organic carbon, respectively. Additionally, C. violaceum showed the highest growth rate and substrate consumption. Inoculants decreased the C/N ratio by up to 60 % in 45 days, compared to 170 without. This shows the acceleration of lignocellulosic-based compost by the tested bacteria.
