TITLE:
Determination of Hydrodynamics in Municipal Waste Water by a Lagoon System with Screen
AUTHORS:
M. García-Martínez, L. J. Osornio-Berthet, H. E. Solís-Correa, U. J. López-Chuken, J. C. Beltrán-Rocha, I. D. Barceló-Quintal
KEYWORDS:
Stabilization Lagoon, Hydrodynamics, Dead Zones, Camber Curve, Screens
JOURNAL NAME:
Journal of Environmental Protection,
Vol.8 No.3,
March
31,
2017
ABSTRACT: Stabilization lagoons are economic systems that are built for treatment of municipal, industrial and agricultural wastewater; these systems are used
in rural communities. Objective of this article is to present the hydrodynamics
flow in lagoon system considering 6 screens with 7 channels containing curved
forms with slopes suitable to stabilize the flow along each channel, and
approach a piston flow. Hydrodynamics of this system with IBER software was
analyzed, where was considered the velocity and hydraulic gradient, using
Froude number. Also transport of total suspended solids was modelled.
Efficiency in the treatment with this design was evaluated, using parameters such as, pH, conductivity, alkalinity, hardness, total solids, dissolved
oxygen, redox potential and Chemical Oxygen Demand (COD). Through the results, a homogeneous transport was observed, mainly dissolved oxygen which was
concordant with redox potential and COD, also through the curves, short
circuits were minimized, avoiding dead zones and making treatment more efficient, finally
were possible to comply with regulations of Mexico NOM-001-SEMARNAT-1996 of
discharges and the NOM-003-SEMARNAT-1997 for water of agricultural use.