Abstract
We consider a dissolved oxygen balance model for Neris, which includes biochemical oxygen demand, nitrification, sedimentation, algae respiration and photosynthesis. The load from point sources, tributaries and distributed sources are taken into account. Long-term systematic components such as drift and seasonal components are analysed by applying time series analysis.
 The model is adapted according to the State Environmental Monitoring, and source data of controlled pollution covering the period 1978-1998.
Highlights
Dissolved oxygen is one of the key parameters when analysing the water quality
Dissolved oxygen depends on the biochemical oxygen demand, nitrification, reaeration, sedimentation, and photosynthesis and on the algae respiration (Fig. 1)
If oxygen is removed from the water column and the concentration falls below the saturation level, there is a tendency to reduce this deficit by the transfer of the gas from the atmosphere through the surface into the stream
Summary
Dissolved oxygen depends on the biochemical oxygen demand (deoxygenation), nitrification, reaeration, sedimentation, and photosynthesis and on the algae respiration (Fig. 1). These constituents have six effects on oxygen. In 1925, Streeper and Phelps [1] created a model describing changes in oxygen concentration and its dependence on the organic substances in water (demand of biochemical oxygen). O’Connor and Di Toro have established the dependence of oxygen concentration in water on photosynthesis and algae [2, 3]. The impact of algae on nitrogen transformation was established and described by Thomann, O’Connor and other authors.
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