Illinois Septic Installers Practice Exam 2025 – The All-in-One Guide to Master Your Certification!

Question: 1 / 400

In commercial ATUs, what percentage of the rated hydraulic capacity must total daily flows be at least?

50%

60%

75%

In commercial Aerobic Treatment Units (ATUs), it is required that the total daily flows reach at least 75% of the rated hydraulic capacity. This standard ensures that the ATUs operate efficiently and effectively within their designed parameters. Maintaining a minimum flow percentage is critical for the proper functioning of the treatment system. If flows fall below this threshold, it can disrupt the biological processes essential for treatment, potentially leading to inefficient waste processing and environmental risks.

In the context of septic system management, correctly adhering to this flow requirement helps prevent issues such as tank stagnation or inadequate treatment, which can result from insufficient hydraulic loading. Therefore, the 75% figure is established as a baseline to ensure optimal performance while accommodating the variability often seen in commercial settings.

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