Wastewater Treatment Operator Certification Practice Test

What type of disinfection is gaining popularity, and expected to become a practical alternative to chlorination?

1. Sulfur dioxide

2. Ultraviolet (UV) disinfection

3. Aqueous ammonia

4. Caustic soda

The correct answer is: Ultraviolet (UV) disinfection

Ultraviolet (UV) disinfection is gaining popularity and is expected to become a practical alternative to chlorination in wastewater treatment due to its effectiveness and safety. UV disinfection utilizes light at specific wavelengths to inactivate microorganisms, effectively killing bacteria, viruses, and protozoa without the need to add chemicals to the water. This method has the advantage of not introducing any chemical residuals into the treated water, which is a significant concern with chlorination. Additionally, UV disinfection can provide immediate results, making it highly efficient in reducing pathogen levels. The increased interest in UV disinfection stems from the need for alternatives that minimize chemical use and reduce potential environmental impacts associated with chlorine. Moreover, advancements in UV technology have made systems more affordable and easier to integrate into existing wastewater treatment plants. This ensures that facilities can maintain compliance with stringent regulatory standards for effluent quality without relying solely on chlorine-based processes. In comparison, the other options such as sulfur dioxide and aqueous ammonia, while used in specific contexts, do not have the same broad applicability and acceptability as UV disinfection. Caustic soda is typically used for pH adjustment rather than disinfection. Therefore, UV disinfection is a forward-looking alternative that aligns with current trends toward green and