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Plants aeration period:
Problem:
What is the plant's aeration period?
Solution
The plant's aeration period is the number of hours that the wastewater is aerated during the activated sludge process. These equivalents the hydraulic detention time of the biological reactor
θ= V/Q = 5, 000, 000 l/33.75 × 106 l / day = 0.15 day = 3.6 hours.
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Modulus of elasticity of light-weight concrete The modulus of elasticity of light-weight concrete is about 50 to 55% of that of normal-weight concrete. The loss of prestresses
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problem5.4.6
send any civil engineering related questions . i will write the answers , please tell us the process .
A circular footing is resting on a stiff saturated clay with qu = 250 kN/m 2 . The depth of foundation is 2 m. Verify the diameter of the footing if the column load is 600 kN. S
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