disclosed is a system for reducing the demand of wastewater volume flowing through a wastewater collection piping system and thereby increasing the effective capacity of the system . a portion of the wastewater is diverted from a sewer main . the solids are separated from the liquid , for example , by a vortex separator . the recovered liquid can be treated and made available for reuse or can be disposed of , for example , in a body of water or pumped into the ground . the concentrated solids are reintroduced into the main sewage line in a portion that adjusts the wastewater loading in the sewer main to a predetermined amount or predetermined range . also disclosed is a system capable of reintroducing the concentrated solids into the sewer main in a portion that adjusts the solids loading in the sewer main to a predetermined amount or predetermined range .