What effect does adding polymer have on sludge in the dewatering belt-press process?

Adding polymer to sludge in the dewatering belt-press process serves a crucial role in facilitating the separation of water from solids. Polymers are used primarily as flocculating agents, which means they help to bind tiny particles together into larger aggregates (or flocs). This bonding process is essential because many types of sludge have a negative charge due to the presence of various organic and inorganic materials.

When the polymer is introduced, it neutralizes the charge of the sludge particles, which reduces their electrostatic repulsion. This neutralization allows the particles to come together more easily, forming larger flocs that can be more effectively removed from water during the dewatering process. As a result, this leads to a more efficient separation of water from solids, ultimately improving the overall effectiveness of the dewatering operation.

By facilitating the formation of larger flocs, the use of polymer enhances the clarity of the filtrate, decreases the volume of sludge that still contains significant amounts of water, and contributes to the reduction of the final sludge volume for further treatment or disposal.