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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.
classification of bridge foundations
Define the meaning of Grout - Concrete Grout should be made with any type of recommended cement and using water of a required quality. If very large size ducts are to be groute
pariods of one hundred years
Explain a Critical Path The series of activities which determines the earliest possible date of project completion Usually defined as those activities with minimal or
A rectangular concrete beam is subjected to a factored design shear force of 200 kips. For the beam shown below, determine the required stirrup size and spacing requirement. H = 3
4. Calculate the loose volume of material needed to fill in the trench as sketched below. The following information is also known: [7] o Length of trench = 250 m o Trench
Non-carbonate hardness (NCH) - Water Softening 1. Permanent Hardness, not removed by heating water 2. Ca +2 , Mg +2 combining with ions outside of alkalinity such as Cl -1
define structure?
A pile is driven in uniform clay of large depth. The clay has unconfined compression strength of 90 kN/m 2 . The pile is 30 cm diameter and 6 m long. Verify the safe frictional res
how to draw a regular hexagon using semicircle method
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