Correct option is A
Introduction:
- A. Ozonation: This process involves the use of ozone for III. Disinfection. Ozonation is effective in killing bacteria, viruses, and other pathogens, making it a popular method for wastewater disinfection.
- B. Aeration: Aeration is primarily used to increase oxygen levels in wastewater, which helps in the biological treatment of wastewater. However, none of the given options directly describe aeration's primary function. Given the options, none perfectly match aeration's main purpose, but let's see how others fit better.
- C. Flocculation: This process involves IV. Very small particles are clustered together. Flocculation helps in aggregating fine particles into larger flocs, which can then be more easily removed from the wastewater.
- D. Screening: This process is used for II. Removal of large solids. Screening is the first step in wastewater treatment, where large objects and solids are removed from the wastewater.