What is the main purpose of disinfection in wastewater treatment?

• A. To produce bio-solids for landfill use
• B. To eliminate pathogenic microorganisms
• C. To improve the color of the treated effluent
• D. To reduce nutrient levels in the wastewater

Answer: (B)

The primary goal of disinfection in wastewater treatment is to eliminate pathogenic microorganisms. This process is crucial because untreated wastewater can contain harmful bacteria, viruses, and parasites that pose serious health risks to humans and the environment. Disinfection methods such as chlorination, ultraviolet (UV) treatment, or ozone treatment are employed to inactivate or destroy these pathogens, making the treated effluent safe for discharge into water bodies or for potential reuse.

While other options present activities related to wastewater treatment, they do not reflect the primary intent of disinfection. Producing bio-solids, improving effluent color, and reducing nutrient levels are important aspects of wastewater treatment; however, they are not the fundamental reason for disinfection, which is focused solely on enhancing public health and safety by addressing microbial contamination.