Tennessee Wastewater Operator Practice Exam

What is the main purpose of closing air inlets during extreme weather in a trickling filter?

1. To prevent debris accumulation

2. To control water flow rate

3. To maintain stable temperatures

4. To increase nutrient levels

The correct answer is: To maintain stable temperatures

The main purpose of closing air inlets during extreme weather in a trickling filter is to maintain stable temperatures. Trickling filters rely on microbial activity to treat wastewater, and the efficiency of this biological process can be significantly affected by temperature fluctuations. During extremely cold or hot weather, closing the air inlets helps to insulate the filter, reducing the impact of external temperature changes. This can aid in maintaining optimal conditions for the microorganisms responsible for breaking down waste, thereby ensuring consistent treatment performance. While other options may have relevance in different contexts, they do not directly address the specific necessity of stabilizing the temperature of the trickling filter during extreme weather conditions. Preventing debris accumulation, controlling water flow rate, and increasing nutrient levels do not specifically align with the immediate goal of temperature regulation, which is crucial for the biological processes involved in wastewater treatment.