Characteristics of Pharmaceutical Sludge

Sludge generated from pharmaceutical wastewater treatment often contains a high proportion of organic matter, residual active substances and fine suspended solids. Due to its complex composition, the sludge usually exhibits strong adhesion, poor permeability and slow water release.

These characteristics can significantly affect downstream handling, transportation and disposal if not properly addressed during the dewatering stage.

Challenges in Dewatering High-Viscosity Sludge

Compared with municipal or general industrial sludge, pharmaceutical sludge tends to respond less predictably during mechanical dewatering. Common issues include uneven sludge distribution, insufficient drainage in the gravity zone and unstable cake formation.

If the process is not well controlled, excessive energy consumption, frequent operational adjustments and inconsistent dewatering performance may occur.

Dewatering Strategy Considerations

For high-viscosity pharmaceutical sludge, a staged and controlled dewatering approach is generally more suitable. Pre-thickening through gravity drainage allows free water to be removed gradually before mechanical pressing, reducing the load on the pressing zone.

Stable sludge feeding, uniform distribution and controlled pressure application are also important factors in achieving consistent dewatering results while maintaining operational reliability.

Role of Belt Filter Presses

Belt filter presses are commonly applied in pharmaceutical sludge treatment due to their continuous operation and relatively gentle dewatering mechanism. By combining gravity thickening with progressive belt pressing, these systems can adapt to the characteristics of high-viscosity sludge while maintaining stable operation.

With appropriate configuration and process control, belt filter presses can support reliable sludge volume reduction and contribute to improved overall efficiency in pharmaceutical wastewater treatment plants.