Treatment of liquid streams containing high concentrations of solids using ballasted clarification

A high-solids wastewater treatment system is disclosed. The wastewater treatment system includes a ballasted reactor, a solids-liquid separation subsystem, a pre-treatment subsystem, a ballast feed subsystem, and a ballast recovery subsystem. The high-solids wastewater treatment system can include a reaction tank, a thickener, and a filter press. A method of treating high-solids wastewater is also disclosed. The method includes contacting a wastewater feed with a coagulant or flocculant, thickening the dosed wastewater, treating the effluent with a ballast, settling the treated wastewater, and conveying the ballasted sludge to the wastewater feed, dosed wastewater, or treated wastewater. The wastewater feed may have more than 500 mg/L of total suspended solids. The wastewater feed may contain inorganic solids.