Environmental Engineering in CE
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes

Paralysis of muscles & loss of appetite
Nervous depression
Gastritis & diarrhea
All of these

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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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