California Wastewater Treatment Operator Practice Exam

What is the primary advantage of using UV light as a disinfection method in wastewater treatment?

1. It is cost-effective

2. It eliminates the potential for chemical residues

3. It works quickly without requiring significant space

4. It adds nutrients to the water

The correct answer is: It eliminates the potential for chemical residues

The primary advantage of using ultraviolet (UV) light for disinfection in wastewater treatment is that it eliminates the potential for chemical residues. UV disinfection works by using high-intensity light to destroy or inactivate microorganisms, making it an effective method for pathogen removal without the use of chemicals. This is particularly important in wastewater treatment because the presence of chemical disinfectants can lead to harmful byproducts that might affect water quality and environmental safety. Additionally, the absence of chemical residues enhances water safety for subsequent reuse and protects aquatic ecosystems when discharged back into the environment. Unlike some other disinfection methods, which may leave behind residual chemicals in the treated water, UV treatment provides a more environmentally friendly option that alleviates concerns about toxicity and chemical interactions, making it a preferred choice for many treatment facilities.