Corrosion Resistance and Sealed Conveyance: Key Applications of Stainless Steel Screw Conveyors in Wastewater Treatment

Stainless steel screw conveyors have become essential equipment for solid material transportation in modern wastewater treatment plants due to their corrosion resistance, hygienic sealing, and stable operation. The following presents a generic engineering case study.

During the upgrade project of a medium-sized municipal wastewater treatment plant, multiple stainless steel screw conveyors were integrated into its core sludge dewatering system. For instance, within the sludge dewatering chamber, a steep-angle screw conveyor directly and continuously elevates wet sludge from the belt dewatering machine to an outdoor sludge silo. All material-contacting components are constructed from SS304 stainless steel, effectively resisting moisture, microorganisms, and potential corrosive substances in the sludge to ensure long-term durability in harsh conditions.

Additionally, in the downstream process section of the plant's screening area, shaftless screw conveyors are installed specifically for transporting screenings intercepted by coarse and fine screens. Their shaftless design prevents entanglement, while the stainless steel construction facilitates easy cleaning, enabling clean and efficient collection and transfer of screenings.

This case demonstrates how stainless steel screw conveyors reliably address the collection, short-distance transport, and centralized storage of solid waste—including screenings, grit, and dewatered sludge—in wastewater treatment processes. Beyond enhancing plant-wide automation and clean operation, their low maintenance requirements provide robust support for stable plant operation while reducing energy consumption and operational costs.