Evaluation of a domestic wastewater treatment plant at an intermediate city in Cochabamba, Bolivia | Zendy

Oliver Saavedra | Zendy; Ramiro Escalera | Zendy; Gustavo Heredia | Zendy; Renato Montoya | Zendy; Ivette Echeverría | Zendy; Adriana Villarroel | Zendy; Leo Lorenz Brito | Zendy

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Evaluation of a domestic wastewater treatment plant at an intermediate city in Cochabamba, Bolivia

Author(s) -

Oliver Saavedra,

Ramiro Escalera,

Gustavo Heredia,

Renato Montoya,

Ivette Echeverría,

Adriana Villarroel,

Leo Lorenz Brito

Publication year - 2019

Publication title -

water practice and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.243

H-Index - 15

ISSN - 1751-231X

DOI - 10.2166/wpt.2019.071

Subject(s) - effluent , total suspended solids , environmental science , wastewater , suspended solids , sewage treatment , environmental engineering , sedimentation , total dissolved solids , population , chemical oxygen demand , water quality , organic matter , waste management , engineering , chemistry , ecology , paleontology , demography , organic chemistry , sediment , sociology , biology

This study aims to determine the seasonal variability on the performance of a medium size population wastewater treatment plant (WWTP) in Bolivia. The semi-arid area where WWTP is located, is characterized as agricultural land, with an annual rainfall of 500 mm and a mean temperature of 17 °C. The WWTP is built up of 5 modules, each one compromising two treatment trains composed by UASB reactor and Horizontal Gravel Filter. The performance of the full process has been determined based on water quantity and quality. Seven monitoring campaigns of chemical and physical wastewater characteristics were performed from March to December 2017. The measured effluent showed average removal efficiencies of 83+ 8% and 37+ 60% for total COD and TSS, respectively. The treatment system has proven to be efficient to remove organic matter and total suspended solids, despite the occurrence of high COD and TS influent concentrations, the accumulation of solids at all the processes and the variability of flow and temperature inside the UASB reactors. In order to improve further this efficiency, it is recommended to implement a primary sedimentation unit as a pretreatment for the UASB system that would help to homogenize both the flow and the quality of the influent.

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