1. A wastewater treatment plant uses a circular sedimentation basin to treat 3.1 MGD of domestic wastewater. Domestic wastewater often carries 0.010 mm slit particles with an average density of 1.2 g/cm. The sedimentation tank is 4.5 m deep and 20 m in diameter. The water temperature is 15 °C, the density is 999.1 kg/m, water viscosity is 0.00114 kg/m/s. The gravitational constant is 10 m/s?. What is the hydraulic detention time of the sedimentation tank?

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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1. A wastewater treatment plant uses a circular sedimentation basin to treat 3.1 MGD of domestic
wastewater. Domestic wastewater often carries 0.010 mm slit particles with an average density of 1.2
g/cm. The sedimentation tank is 4.5 m deep and 20 m in diameter. The water temperature is 15 °C,
the density is 999.1 kg/m, water viscosity is 0.00114 kg/m/s. The gravitational constant is 10 m/s?.
What is the hydraulic detention time of the sedimentation tank?
2. Imagine you are working for the city authority as an environmental engineer. Your treated gray
wastewater is released to the nearby river. Community people are receiving their drinking water from
the central city pipeline. City authorities are distributing drinking water to your home by treating the
river water where you released the treated gray wastewater. As environmental engineering, develop
a flow diagram for treating gray wastewater to river water and finally to the drinking water by
following the above narrative.
3. Determine the diameter of a single-stage plastic media filter to reduce an applied BOD, from 150
mg/L to 50 mg/L. Use a flow rate of 0.20 m/s and a recirculation ratio of 10.0 along with a filter
depth of 1.70 m. The water temperature is 20 °C
Transcribed Image Text:1. A wastewater treatment plant uses a circular sedimentation basin to treat 3.1 MGD of domestic wastewater. Domestic wastewater often carries 0.010 mm slit particles with an average density of 1.2 g/cm. The sedimentation tank is 4.5 m deep and 20 m in diameter. The water temperature is 15 °C, the density is 999.1 kg/m, water viscosity is 0.00114 kg/m/s. The gravitational constant is 10 m/s?. What is the hydraulic detention time of the sedimentation tank? 2. Imagine you are working for the city authority as an environmental engineer. Your treated gray wastewater is released to the nearby river. Community people are receiving their drinking water from the central city pipeline. City authorities are distributing drinking water to your home by treating the river water where you released the treated gray wastewater. As environmental engineering, develop a flow diagram for treating gray wastewater to river water and finally to the drinking water by following the above narrative. 3. Determine the diameter of a single-stage plastic media filter to reduce an applied BOD, from 150 mg/L to 50 mg/L. Use a flow rate of 0.20 m/s and a recirculation ratio of 10.0 along with a filter depth of 1.70 m. The water temperature is 20 °C
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