Estabilización de lodos provenientes de plantas de tratamiento de aguas residuales domésticas mediante digestión anaerobia

In wastewater treatment process, one third of treated effluent becomes waste sludge, which presents characteristics of being a hazardous waste. However, when subjected to a stabilization process, it results into a product named bio solid that can be reused in several activities, such as agriculture, soil remediation, bioremediation and many others, due to its beneficial attributes. The purpose of this project is to find the sludge conditions that will optimize the process of stabilization through mesophilic anaerobic digestion. The sludge used was produced in the EPMAP pilot wastewater treatment plant for the city of Quito; which, after a thickening process, was digested and studied using two comparative fully randomized experimental designs. The results analysis was based in the studied variables correlation, in order to understand the bio stabilization process in its whole. The analysis is divided into three components: (1) bio solids stabilization, determined by the ratio SV / ST and digestion; (2) the monitoring of the mesophilic anaerobic digestion process through the study of temperature and pH; and (3) the potential for reuse of bio solids by studying the content of pathogens, heavy metals and macronutrients. In conclusion, it was determined that the sludge conditions that allowed the optimization of the process was to of thicken the sludge with bio accelerator until it obtains 60 percent of humidity and to add a constant dosing of nutrients. In this way it was possible to reduce the digestion time to one week with an efficiency of pathogen reduction of 71 percent, obtaining Class B bio solids.

• 主要作者: Peñaherrera Proaño, Michelle Andrea (author)
• 格式: bachelorThesis
• 语言: spa
• 出版: 2015
• 主题: MEDIO AMBIENTE; TRATAMIENTO DE AGUAS RESIDUALES; GESTIÓN ANAEROBIA; LODOS
• 在线阅读: http://dspace.udla.edu.ec/handle/33000/4511