So, you know how when you take a bath or shower, the water goes down the drain? Well, sometimes in big factories or other places, they have a lot of water mixed with yucky stuff like sludge or sewage. They need to get rid of the water so they can clean the yucky stuff and use it for other things.
A dewatering screw press is like a big machine that helps with this! It has a long, thick screw inside a container. The yucky stuff with the water gets put into the machine, and the screw starts turning, moving the yucky stuff along.
As the yucky stuff moves along the screw, it gets pressed harder and harder against a filter. This squeezes most of the water out of the yucky stuff, leaving behind mostly just the solid, sludgy part.
The water that gets squeezed out of the yucky stuff gets sent to a different place where it can be cleaned or reused. The solid sludge gets taken out of the machine and dried so it can be used for other things, too.
So, basically, a dewatering screw press helps separate water and yucky solid stuff so they can be treated and used in different ways.