Florida Wastewater Practice Test

What effect does proper sludge feed rate have on anaerobic digestion?

1. Decreases methane production

2. Enhances operational control

3. Has no effect on quality

4. Reduces clarity of effluent

The correct answer is: Enhances operational control

A proper sludge feed rate is crucial in anaerobic digestion as it enhances operational control within the digestion process. By maintaining an optimal feed rate, operators can regulate several key factors such as the retention time of the sludge in the digester, the microbial activity, and the overall efficiency of the digestion process. When sludge is fed at the appropriate rate, it allows the microbial population to effectively break down the organic matter, leading to a stable process with consistent biogas production. This control is essential for maximizing methane production, achieving desired digester performance, and minimizing disturbances in the system that could arise from overloading or underfeeding. Operational control directly impacts not just the efficiency of methane production but also the quality of the effluent and the stability of the process. Conversely, improper sludge feeding can lead to fluctuations in methane generation, instability in microbial communities, and ultimately affect the overall system performance.