41. The lowest layer of atmosphere is known as the
42. __________ is the process of killing organism in water.
43. Most of the bacteria in sewage are
44. __________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
45. The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
46. If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
47. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
48. In a sedimentation tank, the detention period for water ranges from __________ hours.
49. In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
50. Which of the following is an adsorbant used for the removal of SO2 from gas/air?
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