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Environmental Engineering

Environmental Engineering
Which of the following values of pH represents a stronger acid?

3
2
4
5

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Environmental Engineering
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

400 ppm
300 ppm
200 ppm
100 ppm

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Environmental Engineering
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

0.5 to 1.0 ppm
1.0 to 5.0 ppm
0.01 to 0.05 ppm
0.05 to 0.5 ppm

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Environmental Engineering
For a given discharge, the efficiency of sedimentation tank can be increased by

Increasing the depth of tank
Decreasing the surface area of tank
Decreasing the depth of tank
Increasing the surface area of tank

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Environmental Engineering
The overflow rate for plain sedimentation tanks is about

1250 to 1500 liters/hour/m²
1500 to 2000 liters/hour/m²
1000 to 1250 liters/hour/ m²
500 to 750 liters/hour/ m²

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Environmental Engineering
The hourly variation factor is usually taken as

2.7
1.5
1.8
2.0

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