Test Your Knowledge – Bleach Disinfection

Now that you have read the post Bleach Disinfection, try working the following practice problems on your own.

  1. How many gallons of bleach at 5.25 percent will be needed to disinfect a 12-inch pipeline that is 3,000 feet long? Use a dosage of 50 ppm and a specific gravity of 1.2.
  2. The Stump Treatment Plant disinfects its flow of 16.8 MGD with 8.25 percent available sodium hypochlorite with a specific gravity of 1.8 to obtain a dosage of 3.3 mg/L. How many gallons of sodium hypochlorite will the plant use a day?

Want to check your answers? Click here.

If you have any questions or comments about these practice problems, feel free to post in the comments section of this entry.

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4 Responses to Test Your Knowledge – Bleach Disinfection

  1. Pingback: Bleach Disinfection |

  2. Terry says:

    Hey Clayton,

    The answer to #2 problem would be right if they were using 100%, instead they are using 8.25%, so it would be a lot more. I maybe misreading the question.

  3. Clayton Getz says:

    Terry,
    You are correct, we are posting an update with the correct answer.

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