40-50% of solids are removed by the primary treatment process.
- Sanitary sewers carry wastewater from your home or business to the treatment plant.
- Bar screens collect trash while letting water pass through.
- A grit chamber slows the flow of water in order to catch grit and solids which settle to the bottom.
- A primary sedimentation tank catches smaller particles which have settled as well as sludge, scum or floating grease.
85-90% of pollutants are removed during the secondary process.
- Air is mixed into the wastewater by an aeration tank. This process speeds the growth of microorganisms which consume organic matter.
- A second settlement tank allows clumping of solid waste and microorganisms to settle to the bottom. The solids and microorganisms are then removed.
- Chlorine, chemicals or additional filtration as required is used to kill any disease causing organisms before wastewater leaves the plant.