What is a sign that your trickling filter is experiencing organic overload and hydraulic underload?

Ponding is a significant indicator of organic overload and hydraulic underload in a trickling filter system. When a trickling filter is properly functioning, the wastewater is evenly distributed over the media, allowing for effective contact between the waste and the microorganisms present. However, if there's an organic overload, the filter may not be able to process the amount of incoming organic matter effectively. This leads to excessive buildup of solids and a reduced ability of the filter to handle hydraulic loads.

As a result, the water may not be able to flow freely through the media, causing pooling or ponding on the surface. This stagnation can create anaerobic conditions, leading to further issues like odors or reduced treatment efficiency. Identifying ponding early allows for corrective measures to be taken, ensuring the trickling filter operates optimally.

Other options may indicate problems in a trickling filter system but do not specifically point to the conditions of organic overload or hydraulic underload as directly as ponding does.