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A nearly pristine river with a saturated DO concentration of 1 1 . 5 mg / L receives a sewagedischarge from a wastewater treatment plant.
A nearly pristine river with a saturated DO concentration of mgL receives a sewagedischarge from a wastewater treatment plant. Immediately upstream of the discharge, theriver flow is ms The river temperature remains constant before and after receiving thedischarge. The upstream river water has an ultimate BOD of mgL and a dissolvedoxygen concentration of mgL The depth and width of the river are quite uniform at m and m respectively, throughout its length. The wastewater discharges at a flow of ms with an ultimate BOD of mgL and a dissolved oxygen concentration of mgLThe sewage being discharged has a kd of d at deg C The river and the wastewatertemperature are at deg Ca Calculate the BOD remaining and dissolved oxygen concentration both in mgLkm downstream of the point where the sewage enters the river.b At what distance in km is the dissolved oxygen at its minimum concentration?
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