Water-and-waste-water Questions Set 34:
How is hardness measured?
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What is the permissible pH range for potable water?
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In what form is nitrogen present in oxidized sewage?
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In which water treatment unit is the schmutzdecke formed?
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Which of the following is not an advantage of steel pipe?
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In a water treatment plant, how can dissolved iron and manganese be removed from the water?
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A sand filter bed is 50 cm deep with a porosity of 0.45 and a specific gravity of 2.62 for the filter material. The head loss during the backwashing process is:
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Which is the most important design parameter used in designing a continuous flow rectangular sedimentation tank for removal of discrete particles?
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A 10 ml of raw sewage was diluted with water in a 300 ml capacity BOD bottle. The DO concentration of the diluted sample at the beginning of the test was 7 mg/l and 5 mg/l after 5 days of incubation at 20°C. The BOD of raw sewage is mg/l
Solution:
Consider the following statements about the mechanism by which chlorine inactivates pathogenic bacteria in water treatment:
1. Chlorine species penetrate the cell walls of the bacteria.
2. Chlorine causes suffocation of the bacterial cells.
3. Chlorine species react with the enzyme system of the bacterial cells.
Which of these statements are correct?
Solution:
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