Discussion
The incorrect statement is:
Answer: C
The incorrect statement is Screening is to remove objectionable tastes, odours and to remove dissolved gases from the water.
Screening is the first treatment step: bar screens remove large floating and suspended material such as leaves, sticks and debris. Removing tastes, odours and dissolved gases such as carbon dioxide and hydrogen sulphide is the job of aeration.
The other three statements are correct: raw water contains suspended, colloidal and dissolved impurities; disinfection, especially the residual chlorine it leaves, protects water against contamination on its way to consumers; and waterborne diseases are caused by pathogenic organisms.
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