Q2: Two primary rectangular clarifiers are 2.3 m in depth. Single effluent weirs are located on the peripheries of the tanks. For a wastewater flow of 2500 m'/hr and overflow rate 1.5 m/hr, calculate: 1. Dimensions of the tanks (m). 2. Weir loading (m/m/d). Is the weir loading within the design criteria. Assume : length (L): width (W) = 3:1

Q2: Two primary rectangular clarifiers are 2.3 m in depth. Single effluent weirs are located on the peripheries of the tanks. For a wastewater flow of 2500 m'/hr and overflow rate 1.5 m/hr, calculate: 1. Dimensions of the tanks (m). 2. Weir loading (m/m/d). Is the weir loading within the design criteria. Assume : length (L): width (W) = 3:1

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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A conventional Wastewater Treatment Plant receives an average daily wastewater flow of 38,000 m2/d. Two circular primary clarifiers, operating in parallel, will treat the flow. Assume that a peripheral effluent weir is used for each clarifier. Consider a detention time of 2 hours and water depth of 4 meters for each clarifier. Determine: a. The diameter (m) of each primary clarifier. b. The weir loading rate (m3/d . m) for each clarifier at average daily flow. c. The expected (not calculated) BODs and Suspended Solids removal efficiencies (%) at an average daily flow rate.
Q3) Two rectangular clarifiers, each 30 ft long, 15 ft wide, settle 0.40 MGD following alum coagulation. The effluent channels have a total weir length of 60 ft. Calculate the detention time, horizontal velocity, rate of flow over the outlet weir
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Determine the characteristics of a unit composed of 2 desilting channels treating a peak wastewater flow of 1500 L7s. A surface load of 40 m/h is assumed. The effective head or depth "P" is set at 1.5 m. Calculate: 1. Area of each channel 2. 2. Effective volume of each desanding channel 3. HRT 4. Cross-sectional area of each desanding channel 5. 5. Width of each channel.
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A municipal WWTP receives 20,000m3/d of flow. They use two circular primary clarifiers operate in parallel which handle the flow equally. The state’s regulatory agency’s criteria are: Average overflow rate = 20 m3/(d·m2) and the average t0(θ) = 3.0 hours a. Determine the clarifier diameter. b. Estimate the side water depth. c. Calculate the weir loading rate in an inboard peripheral weir is used that is 0.25 m from the edge of the clarifier.