Which parameter is commonly used as an indicator of possible faecal contamination in drinking water?
Correct answer: C. Total coliform bacteria
- A. Total hardness
- B. Chloride ions
- C. Total coliform bacteria
- D. Electrical conductivity
Explanation
Coliform bacteria are used as indicator organisms because their presence suggests possible contamination and inadequate sanitary protection. Chloride, hardness and conductivity may indicate chemical conditions but do not directly indicate faecal pollution.
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Environmental engineering examines water supply, water quality, treatment processes, wastewater collection and treatment, solid waste management, air pollution and public health protection. It covers sedimentation, coagulation, filtration, disinfection, biological treatment and disposal methods, while distinguishing drinking-water treatment from sewage treatment and BOD from COD.
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