Water and Wastewater Treatment System Question 7: Give two examples of commonly

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Water and Wastewater Treatment System

Question 7: Give two examples of commonly used methods for measuring the concentration of natural organic matter.

Question 8: Which microorganism is chosen as indicator organisms?

Question 9, Select the size of the intake ports. The design intake flow of water (maximum day demand) is 113,500 m3/day. In the water intake structure, you may have intake ports on different water levels. However, at each level you should have enough area of ports such that the intake velocity is equal to or less than the maximum intake velocity (provided in the slides) when raw water is all withdrawn from ports on the same level. Calculate the minimum area of intake ports at each water level that is required in order to avoid trapping aquatic animals and minimize the suspended matter.

10: The available standard-size gate is 3 m wide and 3 m high, which means the port size should also equal to 3 m wide and 3 m high. How many ports would you need on each water level based on the calculated minimum area of intake ports? What is actual intake velocity of water passing through the ports you designed?

Explanation / Answer

Answer for 7th question:

Commonly used methods for measuring concentration of organic matter are,

- Chemical oxygen demand (COD)

- Biochemical oxygen demand (BOD)

- Total organic carbon (TOC)

- Ultra-violet absorption method (fastest method)

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