Tennessee Wastewater Operator Practice Exam

What is typically done if a sand filter becomes clogged?

1. Replace the sand immediately

2. Use chemical treatment

3. Shut down and acid wash the sand filter

4. Increase flow rate temporarily

The correct answer is: Shut down and acid wash the sand filter

When a sand filter becomes clogged, the appropriate action is to shut down the system and perform an acid wash on the sand filter. This process involves using an acidic solution to remove the buildup of minerals and organic matter that accumulate on the sand. Over time, these deposits can significantly reduce the filter's effectiveness, leading to decreased flow rates and impaired water quality. The acid washing process helps to restore the sand's filtration capability, allowing it to function effectively again. This is crucial in maintaining the overall efficiency of the wastewater treatment process. Regular maintenance, including this type of cleaning, ensures that sand filters operate optimally and helps prolong their lifespan. Other methods like chemical treatments or simply replacing the sand might not effectively address the fundamental problem of clogging and could lead to increased costs and downtime. Increasing the flow rate temporarily could exacerbate the clogging issue by forcing more contaminants into the filter without effectively addressing the root cause.