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Simple Model of Dissolved Oxygen Consumption in a Bay within High Organic Loading: An Applied Remediation Tool

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Abstract

San Vicente Bay is a coastal shallow embayment in Central Chile with multiple uses, one of which is receiving wastewater from industrial fisheries, steel mill effluents, and domestic sewage. A simulation model was developed and applied to dissolved oxygen consumption by organic residues released into this embayment. Three compartments were established as function of: depth, circulation and outfall location. The model compartments had different volumes, and their oxygen saturation value was used as baseline. The parameters: (a) BOD5 of the industrial and urban effluents, (b) oxygen demand by organic sediments, (c) respiration, (d) photosynthesis and (e) re-aeration were included in the model. Iteration results of the model showed severe alterations in Compartment 1, with a decrease of 65% in the oxygen below saturation. Compartment 2 showed a small decline (10%) and compartment 3 did not show apparent changes in oxygen values. Measures recommended for remediation were to decrease the BOD5 loading by 30% in the affected sector. Iteration of the model for 200 h following recommendations derived from the preceding results produced an increase in saturation of 60% (5 ml O2 L−1), which suggested an improvement of the environmental conditions.

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Abbreviations

V :

volume of the compartment

c :

oxygen saturation for temperature and salinity (Lm−3) for the compartment (n)

Q :

inflows (e) or arrow/outflows (s) or arrow for the compartment (n)

S :

Oxygen sources and sinks within the compartment

Uw :

wind velocity at 10 m above the water surface (m s−1)

kL :

reaeration constant, ms−1

A :

surface and bottom areas of compartments (m2) ( n ) = compartment

k 1 :

deoxygenating constant, 1/day

BOD5 :

biochemical oxygen demand

SB:

sediment oxygen demand [ml O2 m−2 s−1]

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Ahumada, R., Vargas, J. & Pagliero, L. Simple Model of Dissolved Oxygen Consumption in a Bay within High Organic Loading: An Applied Remediation Tool. Environ Monit Assess 118, 179–193 (2006). https://doi.org/10.1007/s10661-006-1489-3

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  • DOI: https://doi.org/10.1007/s10661-006-1489-3

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