A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 180 m³/m².d. The design capacity of the waterworks is 0.40 m³/s. The maximum surface per filter is limited to 60 m². Calculate the followings; i. ii. iii. IV. Total surface area required The number of filters, n The surface area for each filter, a Normal filtration rate, v

A city is to install rapid sand filters downstream of the clarifiers. The design loading rate is selected to be 180 m³/m².d. The design capacity of the waterworks is 0.40 m³/s. The maximum surface per filter is limited to 60 m². Calculate the followings; i. ii. iii. IV. Total surface area required The number of filters, n The surface area for each filter, a Normal filtration rate, v

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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5. A rapid sand filter system is designed for a city with a population is 800,000 and the average water demand is estimated at 350 1/capita-day. The filter design application rate is 120 m/d- m2. i. Design the filter system (number, length and width if L/W is 1.5 and length cannot exceed 12 meters) Calculate the backwash water volume as a percent of total water treated if the backwash time is 12 minutes and rise rate is 0.5 meters/min and backwashing is done once every two days. ii.
A circular secondary clarifier will be used to treat an average daily flow (ADF) of 6,000 m3 /d from a high-purity oxygen activated sludge process with a MLSS concentration of 8,500 mg/L. The RAS flow is 2,500 m3 /d. Key design criteria include an overflow rate of 15 m3 /(d.m2 ) and a solids loading rate of 100 kg/(d.m2 ). Determine the minimum diameter (m) of the clarifier to achieve these criteria.
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Aa - E AaBbCc AaBbCc AaBbC 些-A- 1 Normal 1 No Spac. Heading 1 Paragraph 1. 3 Problem 1: With the given data, solve for the infiltration rate and cumulative infiltration after 1.8hrs on a loamy sand soil. Assume water is ponded to a small but negligible depth on the surface. Moisture Content of the soil= 29.862% Residual Moisture Content of the soil = 25% (Final answers should be in 4 decimal places.) The table will be provided in page 2 Problem 2: Using the data from Problem 1. What is its ponding time if: a) Intensity of rainfall is 2100mm/h b) Intensity of rainfall is 260cm/d (Final answers should be in 4 decimal places.) Problem 3: A pipe is laid horizontally and filled with soil, with its open end being saturated. With the given data, solve for its infiltration in 90mins if the soil column had been initially placed upright with its upper surface saturated. Area of the pipe's cross section = 26cm? Infiltrated by 260cm of water after 30mins Hydraulic conductivity is 100mm/br (Final…
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