1. Explain factors affecting self purification of natural streams. 2. What is reoxygenation? What are the factors that affect reoxygenation? 3. Derive Streeter-Phelps equation for oxygen sag analysis. 4. A river is having discharge of 22 m³/s receives wastewater discharge of 5 m³/s. initial DO of the river water is 6.3 mg/L, and DO content in the wastewater is mg/L. The five day BOD in the river water is 3 mg/L, and the wastewater added river has five day BOD of 130 mg/L. Consider saturation DO of 8.22 mg/L deoxygenation and reoygenation constant values of 0.1 and 0.3 per day, respective Find critical DO deficit and DO in the river after one day. The average velocity flow in the stream after mixing of wastewater is 0.18 m/sec. 5. A municipal wastewater treatment plant discharges secondary effluent to a river. worst condition occurs in the summer when the treated wastewater in summer found to have a maximum flow rate of 10000 m²/day, a BODs of 30 mg/L, dissolt oxygen concentration of 1.5 mg/L and temperature of 25°C. At upstream of disposal point the minimum flow in the stream is 0.65 m³/sec with BODs of 3.0 mg dissolved oxygen concentration of 7.0 mg/L. and temperature of 22°C. The mixing wastewater and stream is almost instantaneous at the point of disposal and velocity the mixture is 0.2 m/sec. The reaeration constant is estimated to be 0.4 per day 20°C temperature. Determine dissolve oxygen profile for 100 km downstream of river from the point of discharge.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Transcribed Image Text:Questions 1. Explain factors affecting self purification of natural streams. 2. What is reoxygenation? What are the factors that affect reoxygenation? 3. Derive Streeter-Phelps equation for oxygen sag analysis. 4. A river is having discharge of 22 m³/s receives wastewater discharge of 5 m³/s. The initial DO of the river water is 6.3 mg/L, and DO content in the wastewater is 0.6 mg/L. The five day BOD in the river water is 3 mg/L, and the wastewater added to river has five day BOD of 130 mg/L. Consider saturation DO of 8.22 mg/L and deoxygenation and reoygenation constant values of 0.1 and 0.3 per day, respectively. Find critical DO deficit and DO in the river after one day. The average velocity of flow in the stream after mixing of wastewater is 0.18 m/sec. A municipal wastewater treatment plant discharges secondary effluent to a river. The worst condition occurs in the summer when the treated wastewater in summer is found to have a maximum flow rate of 10000 m³/day, a BOD, of 30 mg/L, dissolved oxygen concentration of 1.5 mg/L and temperature of 25°C. At upstream of the disposal point the minimum flow in the stream is 0.65 m³/sec with BODs of 3.0 mg/L. dissolved oxygen concentration of 7.0 mg/L and temperature of 22°C. The mixing of wastewater and stream is almost instantaneous at the point of disposal and velocity of the mixture is 0.2 m/sec. The reaeration constant is estimated to be 0.4 per day at 20°C temperature. Determine dissolve oxygen profile for 100 km downstream of the river from the point of discharge.

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