Which of the following statements is true regarding wastewater stabilization?

The statement regarding wastewater stabilization that is true is that it leads to the production of inert solids. Wastewater stabilization refers to processes such as anaerobic or aerobic digestion, in which the organic solids within wastewater are broken down by microorganisms. This process reduces the volume and potential odors of the solids and converts them into more stable forms. The end products typically include inert solids that are much less reactive and harmful than the original organic materials. These inert solids can reduce environmental impacts when disposed of or used in land applications.

In contrast, the other statements are inaccurate because they do not accurately represent the nature of wastewater stabilization. The process does not involve the complete removal of all solids; instead, it focuses on treating and reducing the hazardous properties of the solids present. While it can occur under aerobic conditions, it is not limited to them, as anaerobic processes are also a critical part of stabilization methods. Lastly, stabilization does affect biological activity, as the microbial processes involved are central to breaking down the organic compounds, thereby influencing the overall biological activity in wastewater treatment systems.