MODEL OF DEHYDRATOR MDQ-101
DATE OF PILOT TESTS June, 2017
Issue
R&W Filtertechnik GmbH (Wuppertal, Germany) as a company that specializes in the field of filtering and dewatering of sludges and slurries was interested in onsite testing of a multi-disc screw dehydrator to verify its dewatering efficiency and operation parameters at the real facility as this kind of equipment is not widespread in Germany.
Solution
Esmil company together with R&W Filtertechnik GmbH performed on-site pilot tests of multi-disc screw dehydrator MDQ-101 in municipal WWTP in Radevormwald. The object of the study was the mixture of primary and excess activated sludge after anaerobic digestion and thickening. Initially, selection of optimum polymer type and dose was carried out and then optimal operating parameters of dewatering process were adjusted. The unit showed high process efficiency with high automation level along with its simplicity and was jointly recommended for the sludge treatment. At the same time, dewatering process based on multi-disc screw technology allowed to reduce electricity, polymer and water consumption compared with the existing chamber membrane filter presses assuring all requirements for further cake transportation and disposal.
Results
| Type of sludge | Thickened and anaerobically digested mixture of primary and waste activated sludge |
| Unit Sludge Supply | 0.09–0.26 m3/h (0.40–1.15 GPM) 2.4–6.8 kg DS/h (5.3–15.0 lb DS/h) |
| Feed Sludge DS Concentration | 2.60–2.70 % |
| Cake DS Concentration | 19.1–25.0 % |
| Average Polymer Dose | 5.5–9.7 g/kg DS (11.0–19.4 lb/ton DS) |
| Filtrate SS Concentration | 60–700 mg/l (60–700 ppm) |
| Solid Capture | 97.9–99.8 % |
