Environmental Engineering in CE
Lagoons used for purification of polluted water

All of these
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
Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds

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Environmental Engineering in CE
Smoke is produced due to

Poor design & overloading of furnace
Poor quality of fuel and improper mixing of fuel & combustion air
Insufficient supply of combustion air and insufficient time for combustion
All of these

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