CIVL 1101 - Assignment #11

 Name: ________________________

 

"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: Using the data obtained in the first week of water filtration lab, present, analyze, and discuss the data. Your data should be presented in graphical form.

Part 2: 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 3: 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 4: 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.