Preliminary

Nut Island headworks facility

Before the sewage reaches the treatment plant, it first stops at various headworks. Headworks are buildings where solid objects are removed from the sewage. At these headworks, the sewage first goes through bar screens that remove large debris such as rocks, bricks, and branches.

The sewage continues on and goes through grit chambers which remove sand, grit , and other heavy but small debris.

The water flow slows down in the grit chambers, giving the debris time to settle on the bottom of the chamber.

The trash gathered from the bar screens and grit chambers is removed and transported to a landfill.