Test on Tertiary Wastewater Treatment

Question 1: Chlorination in tertiary wastewater treatment primarily focuses on the removal of finely suspended matter and dissolved chemicals.

A. Yes

B. No

Explanation: The study materials state that chlorination is a process used for bacteriological purification, specifically to diminish the number of pathogenic and non-pathogenic organisms. Finely suspended matter is primarily removed by sand filtration, and dissolved chemicals are mentioned as impurities that may require further purification, but chlorination is not identified as the primary method for their removal.

Question 2: According to the provided study materials, what is the primary purpose of tertiary wastewater treatment?

A. To make effluent suitable only for discharge to a river or agricultural use without further purification.

B. To achieve purity levels required for unrestricted re-use of effluent.

C. To introduce additional oxygen into the wastewater for aerobic treatment processes.

D. To remove only the finely suspended matter, as dissolved chemicals and bacteria are fully addressed in secondary treatment.

Explanation: The study materials state that even after aerobic treatment, effluent is 'not yet pure enough for unrestricted re-use' and that 'further purification may be required.' The purpose of tertiary treatment is to address this, making the effluent suitable for unrestricted re-use or other specific purposes by removing impurities such as finely suspended matter, dissolved chemicals, and bacteria.

Question 3: Breakpoint chlorination is essential for the destruction of viruses.

A. Yes

B. No

Explanation: The study materials state that "Breakpoint chlorination is essential for the destruction of viruses."

Question 4: Ultraviolet radiation is the sole factor responsible for inactivating pathogenic bacteria and viruses in maturation ponds.

A. Yes

B. No

Explanation: In maturation ponds, pathogens are inactivated by a complex reaction that involves pH, temperature, and ultraviolet radiation from sunlight, not just UV radiation alone.

Question 5: Based on the provided study materials, what is a key function of maturation ponds with regard to coliforms, nutrients, and algae?

A. To inactivate these substances through a complex reaction involving pH and temperature.

B. To remove coliforms, nutrients, and algae from the effluent.

C. To oxidize ammonia and satisfy the chlorine demand before discharge.

D. To introduce sufficient chlorine to destroy these organisms.

Explanation: The study materials state that maturation ponds' purpose is 'to remove pathogens, coliforms, nutrients and algae'. While pathogens and viruses are inactivated, coliforms, nutrients, and algae are specifically mentioned as being 'removed'.