Production of organic fertilizer by mixed lactic fermentation of pig manure and sugarcane vinasse

Juan J.M.; Juana A.C.; José C.C.; Carmen Á.S. · Revista de Investigaciones Veterinarias del Peru (2026) · DOI: 10.15381/rivep.v37i3.31143

Resumen

This study evaluated the feasibility of producing an organic fertilizer through mixed lactic fermentation using pig manure and sugarcane vinasse, agro-industrial byproducts with high polluting potential. A mixture of 40% pig manure, 40% vinasse, 10% molasses, and 10% microbial consortium was used as inoculum. Four pilot tests were conducted in 30 L stainless steel bioreactors at 40 °C for 7 days. pH and lactic acid percentage were measured daily. At the end of the trials, the resulting liquid and solid fertilizer were characterized physically, chemically and microbiologically. During fermentation, a decrease in pH from 5.23 to 3.24 and an increase in lactic acidity from 0.26 to 1.31% were observed. The liquid fertilizer exhibited high levels of organic matter and essential nutrients (N, P, K), while the solid fertilizer showed values comparable to those reported in the literature. Microbiological analyses confirmed the absence of pathogens, demonstrating the product’s safety. The average production yield, calculated as the ratio of inputs to total fertilizer output, was 88.1%. The yield of the liquid fertilizer was 85.4%, and that of the solid fertilizer, 14.6%. These results demonstrate that mixed lactic fermentation is an efficient strategy for valorising livestock and industrial organic waste, generating products with agricultural value and no health risks. ©Los autores. Este artículo es publicado por la Rev Inv Vet Perú de la Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos. Este es un artículo de acceso abierto, distribuido bajo los términos de la licencia Creative Commons Atribución 4.0 Internacional (CC BY 4.0) [https://creativecommons.org/licenses/by/4.0/deed.es]que permite el uso, distribución y reproducción en cual quier medio, siempre que la obra original sea debidamente citada de su fuente original

Instituciones: Universidad Nacional Agraria La Molina