Florida Wastewater Practice Test

What is the ideal range of parameters for the Activated Sludge Process?

1. 1ppm DO, pH 6.0, 60-70°F

2. 2ppm DO, pH 7.0, 80-95°F

3. 3ppm DO, pH 8.0, 70-80°F

4. 4ppm DO, pH 9.0, 90-100°F

The correct answer is: 2ppm DO, pH 7.0, 80-95°F

The ideal range of parameters for the Activated Sludge Process is characterized by specific conditions that promote the optimal growth of microorganisms involved in aerobic digestion. The correct choice highlights maintaining at least 2 parts per million (ppm) of dissolved oxygen (DO), which is necessary for the aerobic bacteria to effectively break down organic matter in the wastewater. A pH level of 7.0 indicates a neutral environment, which is conducive for the metabolic activities of these bacteria, allowing for a balanced biochemical pathway. Furthermore, the temperature range of 80-95°F creates a warm environment optimal for microbial activity without stressing the organisms, which can lead to inefficiencies or die-offs if temperatures are too extreme. Maintaining these parameters ensures the effectiveness of the Activated Sludge Process in treating wastewater to meet regulatory standards. The other options present variations in DO levels, pH, and temperature that fall outside the ideal range, which could negatively impact the efficiency of the treatment process and the health of the microbial community involved.