Environmental Engineering In Ce - Study Mode
[#156] __________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
Correct Answer
(B) Fluorine
[#157] If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
Correct Answer
(D) 3000 (i.e. 0.3%)
[#158] Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
Correct Answer
(D) All of the above
[#159] In a sedimentation tank, the detention period for water ranges from __________ hours.
Correct Answer
(A) 2 to 4
[#160] In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
Correct Answer
(B) 4 to 5