1. Sewer pipes need be checked for
2. In the activated sludge process
3. With self cleansing velocity in sewers
4. In areas where rainy season is limited to a few months, the type of sewerage system recommended is
5. For trunk and out-fall, the type of sewers generally used, is
6. The spacing of bars of perforations of fine screens used for the treatment of sewage, is
7. The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
8. Before discharging the foul sewage into rivers, it is generally treated by
9. The following is the physical characteristic of sewage
10. If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains
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