California Wastewater Treatment Operator Practice Exam

What is the ideal temperature range for the operation of a trickling filter?

1. 5°C to 15°C

2. 15°C to 25°C

3. 25°C to 35°C

4. 35°C to 45°C

The correct answer is: 25°C to 35°C

The ideal temperature range for the operation of a trickling filter is generally considered to be between 25°C to 35°C. This range promotes optimal microbial activity, which is crucial for the biological treatment of wastewater. At these temperatures, the bacteria involved in breaking down organic material are most active, effectively enhancing the treatment process. Temperature influences the metabolic rates of bacteria, and when the temperature is within this optimal range, it helps maintain a balanced and efficient microbial community on the filter media. Lower temperatures can slow down bacterial activity, while higher temperatures may increase evaporation rates or lead to undesirable conditions that could harm the microbial population. In contrast, the other temperature ranges mentioned may not provide the same level of effectiveness for wastewater treatment. Lower temperatures, such as 5°C to 15°C, can significantly inhibit microbial metabolism, while extremes beyond 35°C can stress the microorganisms, possibly leading to a decline in their performance.