Efecto del porcentaje de estiércol de cuy y estiércol de conejo en el proceso de compostaje de los residuos sólidos domiciliarios de la cabecera parroquial San Luis

Abstract

The current research is based on the comparative study of moveable compost piles generated with household solid waste from San Luis rural parish, located in Riobamba city; this compost was made with different percentages of guinea pig and rabbit manure. An initial analysis of the waste to be composted was carried out calculating an adequate C/N ratio, particle size and humidity percentage in order to guarantee an optimal process. Then, two one-ton piles of 1.5 meters high, 2 meters wide and 3 meters long each were collected by using windrow turning technique, which used P1 (household organic waste + guinea pig manure + sawdust) and P2 (household organic waste + rabbit manure + sawdust, in proportions of 65% waste, 25% manure and 10% sawdust). During the process, it was necessary to monitor the temperature and humidity of both, the substrate and the environment. In addition, eight turns were performed along the process and during each turning process, a representative sample was taken, in which physical-chemical and chemical-biological variables like pH, CR, MO percentage, Corg, NT, C/N ratio, soluble polyphenols and germination index were studied for the development of the process. For the analysis of the final compost, the concentration of heavy metals and macronutrients was also determined. Thus, it was concluded that the samples reflect alkaline pH, adequate CR, and MO percentage relatively high. The final compost reflected optimal C/N and CR values related to the degree of solidity for a mature compost. Regarding the macronutrients and heavy metals values, it is evidenced that they are under the permissible limits. Finally, it is recommended to prepare organic fertilizers through the treatment of organic waste generated at home.