How Vortex Manholes Reduce Sewer OdorsWhen hydrogen sul�de gas and other sewer gases enter the air, they cause a problem. The Vortex Flow Insert uses the wastewater in the sewer’s own �ow energy to control the type of water �ow which releases gasses. The spiral �ow design creates a downdraft to trap gases and force air into the sewage �ow rather than releasing gases into the air.

How It Works:1) Wastewater runs into the Vortex Flow Insert, which directs it

around a curve which gets smaller and smaller. At the same time, the increasing slope of the vortex form speeds up the water �ow.

2) Once the water �ow shoots into a smaller drop pipe, the speed and centrifugal forces cause the wastewater to hug the inside walls of the drop pipe. The spiral �ow creates a stable air core with a slight negative pressure, which sucks airborne gases down to the bottom of the structure.

3) The �ow is sunk in a pool at the bottom. Air and gases that were drawn down are forced back through the wastewater and are put back in the �ow. This greatly reduces the dissolved oxygen concentration in the wastewater, so the compounds that cause the odors can dealt with below ground.