erzo ARA, sewage sludge drying Oftringen - pumps and conveying technology for dewatered sewage sludge
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Description & Project Overview
As part of the “Replacement construction for sewage sludge utilization” project, the previous sewage sludge incineration facility on the site of the waste recycling plant (KVA) will be replaced by a new drying system. This plant is intended to dry 34,000 t of sewage sludge annually from an average of 28.5% to around 90% dry matter (TS). The sewage sludge consists of ARA's own sludge and sludge supplied by other ARAs in Switzerland with an average density of 1.2 t/m3.
The system consists of several components: a reception hall for the sludge, a logistics system with a bunker, crane and conveyor systems, dryers with exhaust air purification and dry goods storage with a loading point for removal. The dewatered sewage sludge is delivered to the receiving hall by truck and dumped into the receiving bunker. From there it is transported via a crane system to the stacking bunker or directly to the sludge feeder.
The dewatered sludge is pumped from the sludge feeder into the drying area using a pump system. The dryers dry the sewage sludge and the resulting exhaust air is passed through an exhaust air purification system. The dried sewage sludge (called dry material) is transported into the dry material silos via hydraulic conveying systems.
The loading point for collecting the dry goods is located under the dry goods silos. The dry material is used as a substitute fuel in the cement industry. The pump and conveyor technology consists of two independent conveyor lines, each with a moving floor to avoid and resolve bridging, a hydraulic pre-tamping screw, a hydraulic valveless thick matter piston pump, a hydraulic system for driving and a lubricant injection for process water.
Each conveyor line is designed for a discharge rate of 12 m3/h; The entire system must be designed according to the redundancy principle of 2 × 100%. There is already a wastewater treatment plant (WWTP) and a waste recycling plant on the erzo ARA site