Environmental Engineering in CE
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is

Proportional to the pressure of the gas
Inversely proportional to viscosity of gas
Both B and C
Proportional to the viscosity & density of the gas

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Environmental Engineering in CE
Lagoons used for purification of polluted water

Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds
Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre
Use micro-organisms/bacteria in presence of dissolved oxygen
All of these

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