“Evaluación fisicoquímica y microbiológica del sistema de lagunas facultivas para el tratamiento de las aguas residuales de la ciudad de Liberia, Guanacaste.”
2000
Instituto Tecnológico De Costa Rica. Escuela de Biología.
Instituto Costarricense de Acueductos y Alcantarillados (AyA).
Proyecto de Graduación (Bachillerato en Ingeniería en Biotecnología). Instituto Tecnológico de Costa Rica. Escuela de Biología, 2000.
On the year 2000 began to operate the new facultative lagoons of Liberia,
Guanacaste, for the wastewater treatment. The system had two lagoon bateries in
serie working in parallel. There was identificated no domestic wastewater discharges
of restaurants, gas stations, garages and from the Liberia´s hospital. It was very
important to identificated them because they flowed down chemistries that can affect
the lagoon biotechnology dynamics. The principal problem was the greases in the
wastewater and the toxics from the hospital. Each one of the four lagoons was
hydraulic, chemistry and bacteriologycal evaluated per 20 hours in four different days.
The primary lagoons had a retention time of 24.3 days, 31.5 days in the secondary
lagoons and 55.8 days for all the system. The influent organic load and the
superficial organic load were very low for a facultative lagoon. The effluent was lower
than the physic – chemistries law maxim score but it was higher in the coliforms
score. The principal microalgaes of each lagoon were identificated and there were
found Euglenophytas (as Euglena sp. and Phacus sp.) in the primary lagoons which
are characteristics in water with high organic load and the Cyanophyta Oscillatoria sp.
in the secondary lagoon and in the final effluent, which is typical in water with nitrites
and nitrates.
Instituto Tecnológico de Costa Rica
Lidia Gómez
Cartago - 300m Este del Estadio Fello Meza. Apartado 159-7050.
2550-2263, 2550-2365