Which of the following is a method of dewatering stabilized sludge?

A belt press is a mechanical device used to remove excess water from stabilized sludge, effectively reducing its volume and weight. This process involves applying significant pressure to the sludge between two belts, which forces water out of the sludge while allowing it to remain as a thicker, more manageable mass. The belt press is a widely used method in wastewater treatment plants for dewatering purposes because it is efficient, relatively simple to operate, and can handle various types of sludge.

In contrast, incineration is a method of sludge disposal rather than dewatering. It involves burning the sludge at high temperatures to reduce it to ash, which does not specifically address the issue of reducing the water content.

An aeration tank is a part of the biological treatment process where microorganisms help to break down organic matter in wastewater, but it does not serve the purpose of dewatering sludge.

Chemical precipitation is a treatment process used to remove certain contaminants or solids from wastewater by adding chemicals that cause particles to clump together and settle out. While it can improve sludge quality, it does not specifically focus on the dewatering aspect.

Thus, a belt press is the most suitable method for dewatering stabilized sludge among the provided options.