What advantage do step-feed activated sludge processes provide during high influent organic loads?

The advantage of step-feed activated sludge processes during high influent organic loads lies specifically in their ability to allow even distribution of primary effluent in the aeration basin. This approach involves introducing the influent into multiple points along the length of the aeration basin rather than at just one location. By distributing the incoming flow effectively, it helps in maintaining optimal conditions for microbial activity throughout the basin, which is crucial when organic loads are high.

This even distribution is vital because it prevents localized spikes in organic concentration, which can lead to decreased treatment efficiency and potential issues such as foaming or sedimentation problems. It helps maintain a more consistent and stable operating environment, enhancing the overall performance of the treatment system. This is particularly important in handling variable and high load conditions, ensuring that the biological treatment processes can effectively manage and degrade the organic matter present in the wastewater.

Other options, while related to wastewater treatment processes, do not specifically address the unique benefits provided by step-feed approaches in handling high organic loads.