Disinfection of water is done to remove

More Questions from Environmental Engineering

• Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
• Photochemical smog is formed from automobile exhaust
• Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
• Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m2/hr.
• Pick out the wrong statement.
• The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
• Water filtration rate in a slow sand filter ranges from __________ litres/m2/hr.
• Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.
• The pH value of potable water should be between
• Maximum permissible residual chlorine in treated water should be __________ mg/litre.

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