Final answer:
Approximately 25% of the total solids in wastewater are suspended solids, which can be removed through sedimentation and filtration during the primary treatment phase of wastewater management.
Step-by-step explanation:
Approximately 25% of the total solids in wastewater is characterized as suspended solids. This is because, in wastewater, a suspension is a heterogeneous mixture where solids do not dissolve but are rather dispersed throughout the liquid. These solids are larger in size compared to dissolved solids and can be removed by processes such as sedimentation and filtration during the primary treatment phase. Wastewater treatment includes primary treatment focused on solid removal, secondary treatment based on bacterial decomposition, and tertiary treatment that involves additional filtration.