List in order the steps of wastewater treatment?

The steps of wastewater treatment typically include: 1) Preliminary Treatment, where large solids and debris are removed through screening and grit removal; 2) Primary Treatment, which involves sedimentation to remove settleable organic and inorganic solids; 3) Secondary Treatment, where biological processes, such as activated sludge or trickling filters, are used to further reduce organic matter and nutrients; and 4) Tertiary Treatment, which provides advanced treatment methods, such as filtration and disinfection, to remove remaining contaminants before the treated water is discharged or reused.