Estabilización de lodos de la Planta de Tratamiento de Aguas Residuales “Las Viñitas” mediante la técnica de lumbricultura para la obtención de abono orgánico

Abstract

In this study, optimal conditions were determined to stabilize the sludge from the temporary storage silo of “Las Viñitas” Wastewater Treatment Plant. This used vermiculture techniques to produce organic fertilizer. The study began with an initial characterization of the sludge, and two treatment alternatives were established for waste utilization (fresh and dry pruning waste and organic residues) with variations in substrate material and sludge quantity with 80 kg per bed in total. Subsequently, the worms were introduced using the survival technique known as the 50 Worm Test (PL50). Throughout the 45-day process, control parameters such as pH, conductivity, temperature, and humidity were measured and regulated both in situ and in the PTAR laboratories. After observing that the bed material had transformed into fertilizer, the worms were harvested by reducing moisture and inducing food stress. The final product was analyzed in the LABCESTTA Environmental Analysis Laboratory. At the conclusion of the treatment, it was determined that the second alternative was the most suitable for sludge stabilization, resulting in 50 kg of final product, representing a 37.5% reduction in weight. The analysis of the fertilizer, compared to the initial characterization of the sludge, indicated that the final product poses no hazard and is classified as Class A according to the cited regulations. This means that its application to soil has no usage restrictions.