Diseño e implementación de un sistema de tratamiento de lodos residuales de una PTAR a escala de laboratorio en la Facultad de Ciencias - ESPOCH, 2015

Abstract

A system of treatment of sewage sludge of a waste water treatment plant (WWTP) in laboratory-scale was designed and implemented, in the Sciences Faculty of Escuela Superior Politecnica de Chimborazo (ESPOCH). The investigation began with a preliminary characterization of the sewage sludge of the WWTP - Tiugua El Parque of Canton Ambato, whose results led to choose a treatment consisting of a sludge thickener by gravity (STG) and sludge drying beds (SDB), measuring by parameters of design and equations established, obtaining theoretical values, corrected to 11% and adjusted to values of construction. The STG and the SDB were built in stainless steel and PVC, in two mechanical workshops of the Canton Ambato, and then transferred and implemented in the Laboratory of Air of the Sciences Faculty of ESPOCH of Canton Riobamba, where three experimental evidences were made (sedimentation in flood, sedimentation in STG and drained in SDB) for a concentrated and diluted sample, obtained of the WWTP - Cunchibamba of Canton Ambato. The total suspended solids (TSS) and the percentage of humidity (%H) were evaluated. The STG concentrated the TSS in 12 hours, in the sample concentration of 3980 mg/L to 4245 mg/L and in the diluted 2335 mg/L to 6703 mg/L. The SDB reduced the TSS in the water and the %H in the sludge in 72 hours, in the sample concentration of 4245 mg/L to 1003 mg/L and of 92.21% to 69.88% and in the diluted of 6703 mg/L to 48 mg/L and of 81.77% to 48.13%. The results obtained allowed to conclude that the treatment system is efficient, concentrating the TSS and reducing the %H in the sludge and reducing the TSS in the water. It is recommended to give maintenance to the equipment after each test.