Environmental Engineering in CE
In the context of the chemical process industries, the term BOD is normally associated with the

Characterisation of solid wastes
Organic concentration in gaseous effluents
Characterisation of liquid effluents
Characterisation of boiler feed water

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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
All of these
Use micro-organisms/bacteria in presence of dissolved oxygen

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