Which of the following could potentially disrupt the treatment process in a septic system?

Flushing feminine hygiene products can significantly disrupt the treatment process in a septic system due to their composition and absorbency. These products do not break down easily and can lead to clogs in the pipes and within the septic tank itself. As they accumulate, they can obstruct the flow of waste, leading to backups and potential system failures.

In contrast, using biodegradable soaps and flushing toilet paper are generally not harmful to the system, as they are designed to break down over time. While disposing of food scraps can be problematic depending on the quantity and type, it's not as definitive a disruptor as flushing items primarily designed to be disposed of in the landfill, like feminine hygiene products. The interaction of these items with the bacterial processes necessary for proper septic function can lead to larger issues if not addressed.