What is the outcome of higher primary total solids (TS) to waste activated solids (WAS) ratio?

A higher primary total solids (TS) to waste activated solids (WAS) ratio indicates a greater amount of primary sludge relative to the waste activated sludge. When this ratio increases, it implies that there is more settleable material in the wastewater that can help facilitate the treatment process. As a result, the presence of additional primary solids can lead to improved efficiency in the biological treatment process, reducing the need for additional chemicals that might otherwise be required to enhance settling or treat the wastewater. This relationship demonstrates how a balance of solid types can influence the treatment dynamics, ultimately allowing for less chemical intervention to achieve the desired treatment outcomes.