TSS is the most common measure of the amount of solids, both organic and inorganic, in wastewater effluent. Raw wastewater has a TSS typically ranging from 155 to 330 mg/L, with 250 mg/L being typical concentration. After going through primary treatment in a septic tank, a typical TSS value is less than 65 mg/L. After secondary treatment in an advanced treatment system, the TSS will normally be below 25 mg/L.Biochemical oxygen demand and TSS together measure the strength of the wastewater. They can serve as an indicator of system performance. The organic loading rate of a system is the number of
