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Department of Civil Engineering
CIVL 1101 - Assignment 11
set cell vertical height


"Gravitation can not be held responsible for people falling in love" - Albert Einstein

Objective

The purpose of this assignment is to estimate the hydraulic loading rate on a filter and to determine the required backwash velocity and the depth of the expanded medium bed in a sand filter.

Part 1: Consider the filters in the lab using only sand as the filter medium. The flowrate through the filter is 900 ml/min, the diameter of the filter is 3.5 in., the depth of the filter bed is 6 in., the sand has a particle diameter of 0.5 mm or 0.02 in. with a settling velocity of 0.27 ft./s, and the porosity of the sand is 0.30.

  1. Determine the hydraulic loading rate in gpd/ft.2
     
  2. Based on the hydraulic loading rate, classify the filter as either a slow sand filter or a rapid sand filter.
     
  3. Determine the required backwash velocity to expand the sand filters in the lab to a porosity of 0.80.
     
  4. Determine the depth of the expanded filter bed.

Part 2: Develop a Word document describing how to compute filter efficiency. Make sure your equations follow the format we discussed in class and use the equation editor.

Part 3: Read Chapter 12 in the Strategies for Creative Problem Solving by Fogler and LeBlanc and review all previous quizzes for a 15 question Final Quiz.

 

 

 

Coversheet for homework

 


This website was originally developed by Charles Camp for CIVL 1101.
This site is Maintained by the Department of Civil Engineering at the University of Memphis.
Your comments and questions are welcomed.

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Department of Civil Engineering| 104 Engineering Science Bldg. |Memphis, TN 38152 | Phone: 901/678-2746 | Fax: 901/678-3026 | Last updated: 11/12/2021