Rediseño de la Planta de Tratamiento de Aguas Residuales Huasimpamba-la Paz del cantón San Pedro de Pelileo.

Abstract

The redesign of Waste Water Treatment Plan “Huasimpamba-La Paz” located in the city San Pedro de Pelileo, province of Tungurahua was carried out to guarantee the nature rights. An analysis of the plant and its current components were conducted determining that processes are a considerable inconvenient and its maintenance is not appropriate; grilles are saturated of lots of solid wastes, the septic tank does not work properly and the aerobic filter is totally damaged. It was necessary to measure the outflow to develop this study, the daily outflow is 0,25 L/s, taking samples was also performed at the inlet and outlet of the treatment plant in order to execute the physics, chemical and microbiological analysis and it was determined that there are parameters that are not under the environmental norm TULSMA, Table 12, Discharge to a fresh water resource such as: Chemical Demand of Oxygen, Biochemical Demand of Oxygen, Sulfurs, Surfactants, Oil and Fat, Total Nitrogen and Fecal Coliforms. Base on characterization, the most appropriate treatment system was chosen, it has a grill, a sedimentation tank Imhoff and an ascending flow anaerobic filter with a filter bed made of gravel and actived carbon with 1,20m and 0,80m of thickness respectively. After characterization of treated water these results were obtained: 7,91 pH, 74 mg/L Chemical Demand of Oxygen, 17 mg/L Biochemical of Oxygen, 0,3 mg/L Oil and Fat, 10,89 mg/L Total Nitrogen, 130 mg/L Sulfurs; with this process of depuration it will decrease the organic and microbiological part al 93%. It was concluded that the established parameters fulfill the current environmental norm. It is recommended to the Municipality of the city of San Pedro de Pelileo to implement a new Waste Water Treatment System to reach the norm of Unified Text of Secondary Regulations given by Ministry of Environment.