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What is a screw press for sludge dewatering?

Simply put, a dewatering screw press separates liquids from solids. It is a slow-moving equipment that dewaters sludge through a gravity process. Screw presses are used for materials that are difficult to dewater, including materials that are packed together. Screw presses use a filtration system to separate liquid from solid matter. Liquid is collected as it flows through a screen or filter and can then be reused.

Dewatering screw presses play a role in multiple industry sectors, not just wastewater treatment. Sludge dryer systems that separate liquids from solids are used in the paper industry to remove moisture from cellulose fibers. In the chemical industry, screw presses are used in a variety of processes, including those for synthetic rubber, hydrated polymers, and sodium alginate. The food industry uses screw presses to extract alcohol from food. It is also used to separate water from waste food for conversion into animal feed.