What process can be used to remove water from sludge?

• A. Sand bed
• B. Centrifuge
• C. Dewatering press
• D. Mechanical filter

Answer: (A)

The most effective method for removing water from sludge is through processes such as using a centrifuge, dewatering press, or other mechanical dewatering techniques. A centrifuge applies mechanical force to separate the water from the solids in sludge. It accomplishes this by spinning the sludge at high speeds, allowing the denser solids to settle at the bottom while the liquid is expelled.

A dewatering press, on the other hand, operates by applying pressure to the sludge, forcing the water out and leaving behind a drier solid material. This method is efficient for achieving a significant reduction in moisture content.

While sand beds can be used in some contexts to filter water, they are not primarily designed nor the most effective method for directly removing water from sludge. In comparison, centrifuges and dewatering presses are specifically engineered for this purpose, making them more suitable options for dewatering processes in wastewater treatment.