Which water-quality parameter indicates the amount of oxygen available for aquatic organisms in a water body?
Correct answer: A. Dissolved oxygen
- A. Dissolved oxygen
- B. Total hardness
- C. Electrical conductivity
- D. Alkalinity
Explanation
Dissolved oxygen is the oxygen present in water and is directly available to aquatic organisms. Low dissolved oxygen can indicate organic pollution or excessive biological activity, whereas hardness, conductivity and alkalinity describe different water properties.
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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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