Technical, financial, and environmental evaluation of the alkaline sanitization of sewage sludge for its transformation into biosolid
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| Autores: | , |
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| Formato: | artículo original |
| Estado: | Versión publicada |
| Fecha de Publicación: | 2024 |
| Descripción: | [Introduction]: The search for techniques and methods for managing sludge generated during wastewater treatment is necessary to ensure a sustainable sanitation in the medium term in Costa Rica. An interesting approach involves converting sludge into a biosolid usable in agriculture through alkaline sanitization. [Objective]: This article evaluated the efficacy and economic and environmental viability of this technique for obtaining an agriculturally usable type A biosolid from municipal wastewater treatment plant (WWTP) sludge. [Methodology]: To this end, the efficacy in reducing microbiological parameters was experimentally tested at the laboratory scale using quicklime, for anaerobic and aerobic WWTP sludge. The experimental results fed a benefit/cost analysis model and a life cycle assessment. [Results]: It was confirmed that the application of a 40% lime dose allowed the obtention of a type A biosolid with non-detectable concentrations of pathogenic microorganisms, which remained in that condition for more than 30 days. Additionally, the benefit/cost and life cycle analyses concluded that this option would be more attractive than sludge disposal in a landfill, due to the corresponding savings in chemical compounds (fertilizers, agricultural lime). [Conclusions]: Therefore, alkaline sanitization can be considered suitable for WWTP sludge management in Costa Rica. Its application on a larger scale should be further investigated. |
| País: | Portal de Revistas UNA |
| Institución: | Universidad Nacional de Costa Rica |
| Repositorio: | Portal de Revistas UNA |
| Lenguaje: | Español Inglés |
| OAI Identifier: | oai:ojs.www.una.ac.cr:article/19652 |
| Acceso en línea: | https://www.revistas.una.ac.cr/index.php/ambientales/article/view/19652 |
| Palabra clave: | biosolid circular economy liming sanitation wastewater sludge economía circular encalado saneamiento biosólido fango de depuradora economia circular caiado saneamento biossólido lodo de esgoto |