Florida Drinking Water Operator "B" Practice Test

What are the health implications of using chlorine dioxide in water treatment?

1. It generates toxic gas

2. It produces chlorite and chlorate

3. It improves water taste

4. It creates disinfection byproducts

The correct answer is: It produces chlorite and chlorate

Chlorine dioxide is widely used in water treatment for its potent disinfecting capabilities. When chlorine dioxide is utilized, it effectively kills bacteria, viruses, and other pathogens, providing safe drinking water. However, one of the byproducts of its use is the formation of chlorite and chlorate, which are concerns regarding water safety and regulatory compliance. Chlorite can pose health risks if present at high concentrations, as it may lead to various health issues, such as effects on the nervous system. Chlorate has also been associated with health risks, particularly in its potential to disrupt red blood cell production and lead to methemoglobinemia in high doses. Recognizing the implications of chlorite and chlorate formation in water is crucial for water treatment operators to ensure that they remain within safe limits set by health regulations. This awareness is vital for managing both the effectiveness of disinfection processes and the safety of the water being supplied to consumers. Thus, understanding the production of chlorite and chlorate is essential for evaluating the overall impact of chlorine dioxide on public health in water treatment practices.