Environmental Engineering in CE
Higher concentration of CO₂ in atmosphere

Prevents solar heat being radiated out completely, resulting in
All of these
Allows visible solar radiation (ultraviolet) of short wave-length to pass through
Reflects and absorbs the longer wavelength (infra-red) radiations

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Environmental Engineering in CE
Lagoons used for purification of polluted water

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

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