Abstract
The prediction of water quality in terms of variables like dissolved oxygen (DO), biochemical oxygen demand (BOD), pH value, total dissolved solids (TDS) and salinity etc. is useful for evaluating the use of water for various related purposes. The widely used Streeter and Phelps models for computing biochemical oxygen demand and its impact on dissolved oxygen do not account for the settleable component of BOD and related implications. The model also does not account for the impact of storage zone on the stream’s DO. In the present work an attempt is made to develop a model which simultaneously accounts for the settleable component of BOD and the effect of storage zones onriver’s DO. An application of the model to real field data suggests that the cumulative impact of settleable BOD and presence of storage zone in the river is to shift the critical deficit closer to the point source and magnify its amount.
Highlights
Dissolved Oxygen is the surrogate variable for the general health of an aquatic eco-system
The widely used Streeter and Phelps models for computing biochemical oxygen demand and its impact on dissolved oxygen do not account for the settleable component of BOD and related implications
Case 1: The entire BOD is in dissolved form and the Creek has no storage zone(S-P model)
Summary
Dissolved Oxygen is the surrogate variable for the general health of an aquatic eco-system. The model was well suited with the computational capabilities of that time, but it did not include that part of BOD which is in settleable form This situation arises when partially treated/ untreated waste enters the river. Model that explicitly considers the effect of transient storage on DO below a point source of BOD containing only the dissolved part of BOD. The model presented by Chapra and Runkel 1999 [7] is extended to incorporate settleable part of BOD along with the dissolved part which represents the situation in which the partially treated/untreated waste enters the river having stagnant zone on the bank of river. The present work, addresses such a situation and develops a model to study the cumulative effect of stagnant zone and two types of BOD on river’s DO below a point source, under steady state condition
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