Tennessee Wastewater Operator Practice Exam

Which of the following is a method to resolve algal growth in sand filters?

1. Increase the filtration rate

2. Dose with chlorine

3. Add sand to the filter

4. Remove and clean the filter manually

The correct answer is: Dose with chlorine

The method of dosing with chlorine is effective in managing algal growth in sand filters because chlorine is a powerful disinfectant that can kill algal cells and prevent them from proliferating. Chlorine treatment not only reduces existing algal populations but also helps to maintain an appropriate balance in the biological ecosystem of the sand filter. By controlling the growth of algae, chlorination can significantly improve filtration efficiency and water quality, allowing the sand filter to function optimally. This approach is particularly useful in situations where algal blooms may disrupt the operation of the filter, leading to reduced permeability or clogging. Applying chlorine effectively mitigates these issues, ensuring that the filter remains functional and efficient for wastewater treatment.