School of Civil & Environmental Engineering, AAU

Water Treatment

Water Treatment (CEng 342), Cr. hrs: 3 Course Outline

  1. Characteristics of Water
  2. Water Quality and Health
  3. Introduction to Water Treatment Process
  4. Coagulation and Flocculation
  5. Sedimentation
  6. Filtration
  7. Disinfection
  8. Floatation
  9. Miscellanous Water Treatment Processes
  10. Low cost water treatments


  1. Textbook: Elements of water supply Engineering by Tesfaye Nigussie
  2. Qasim S.R, Motley E.M and Zhu G. Waterworks Engineering

Lecture Slides

Chapter 1 Characteristics of Water      [Assignment 1]

Chapter 2a Water Quality and Health

Chapter 2b Water Quality Standards

Chapter 3 Introduction to Water Treatment

Chapter 4  Coagulation and Flocculation  (Updated!)      [Assignment on Coagulation & flocculation 2013]

Chapter 5 Sedimention (Updated on 11/11/13) [Assignment 3]

Chapter 6 Filtration (Updated!) [Assignment 4 06]

Chapter 7 Disinfection

Chapter 8 Dissolved Air Flotation [New!]

Chapter 9 Softening

Chapter 10 Low cost water treatments [New!]

List of Tests

Week 1 PH and Conductivity

Week 2: Acidity and Alkalinity

Week 3: Hardness

Week4: Jar test and Turbidity

Week 5: Free residual Chlorine

Week 6: DO, BOD, COD

Week 7: Sulfate and Phosphate

Week 8: Nitrate and Chloride

Week 9: Iron and Manganese

14 Responses

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  1. […] Water Treatment   […]

    • endalkachew said, on November 30, 2012 at 3:37 pm

      Thank you very much!

  2. Yihunie Fenta said, on March 14, 2011 at 6:02 am

    You are really open and honest. I never see such a professional who forward lecture slid.
    I want to appreciate you.

  3. alehegnyehuala said, on November 9, 2011 at 7:42 pm

    realy i like it since i need it now.

  4. Alemseged Melles said, on August 18, 2012 at 8:40 am

    Very Interesting Sir; Like To read Hydro-power Engineering as my final project. this the way how a system scheduled too;
    Thank you;


  5. Eyobed wubneh said, on November 2, 2012 at 3:09 pm

    thank you

  6. addis said, on November 6, 2012 at 9:20 am

    really it is very interesting to get what you need like this siting at home. it will be full if you gays up loded sample examples

  7. Alemayehu Dergu said, on January 27, 2013 at 4:22 pm

    thanks for addressing students in this way.

  8. Hintsa Haile said, on February 25, 2013 at 11:37 am

    Thanks for making it easy for us this way

  9. Sintu said, on April 3, 2013 at 7:43 am

    Im Using ur slide for Teaching/Lecturing student ,,,,i wanna thank you ,,,,,,keep it up in providing such short note .

  10. sedimentation said, on June 13, 2013 at 1:15 am

    this is very nice to understand easily
    keep it up

  11. Wiktor Tomkiewicz said, on November 13, 2013 at 12:25 am

    Hi there,

    I am approaching to solve a problem detailed in one of your homework assignments. ( Number 3 is giving me trouble. It states:

    3. A water treatment plant is processing a flow of 42000 m3/d. The flocculation system consists of three identical parallel units. A side view of one of the units is shown in the sketch below. The dimensions of each flocculation unit are 4.5 m wide by 4.5 m deep by 18.8 m long. The inlet baffle is located 0.3 m from the front wall. Each unit has three sets of paddles mounted on a horizontal shaft. There are three sets of paddles attached to the shaft. The first set of paddles has four paddles on each arm (total of eight paddles) with centers located at 1.9, 1.7, 1.5, and 1.3 m from the shaft. The second set has three paddles on each arm with centers located at 1.9, 1.7, and 1.5 m from the shaft, and the third set has two paddles per arm with centers located at 1.9 and 1.5 m from the shaft. Each paddle is 0.1 m wide and 4.5 m long. The first paddle set is 0.8 m from the inlet baffle and the paddle set are separated by a distance of 0.8 m. At temperatures of 2 and 25°C what is the rotational speed of the shaft to achieve a mean velocity gradient of 20 s-l in a unit? What is the local velocity gradient for each paddle set? CD = 1.8, k = 0.25.

    I have no trouble finding the rotational speed of the shaft, however, finding the local velocity gradient for each paddle set is challenging. Do you know if you could explain or send me a solution?

    Thank You

  12. abiyot said, on November 20, 2013 at 5:49 pm

    every thing u provide us is very very very important ! and u make things simpler to be understood by everybody. U are very qualified teacher i ever seen !

  13. habtamu said, on February 18, 2014 at 7:47 am

    Really Thank you and nice particularly for fresh teachers!

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