Dehydris Twist - Boost your productivity in sludge dewatering


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An automated process combining plate filter press efficiency and centrifugal productivity. Up to 30% reduction in sludge bulk compared to conventional dewatering is possible with Dehydris Twist

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Dehydris Twist - Boost your productivity in sludge dewatering

  2. 2. BIOSOLIDS BIOSOLIDES CONTENTS Dehydris™ Twist • Dehydris™ Twist on the dryness scale • Dehydris™ Twist Workshop • Uses and post treatments • A Partnership with BUCHER UNIPEKTIN • Operating Principle • Dehydris™ Twist Advantages • Case Study: Châteaubourg (35), FRANCE 2 2
  3. 3. Dehydris Twist ON THE DRYNESSBIOSOLIDS BIOSOLIDES SCALE Dehydris™ Twist 60 – 90 % 20 – 45 % 4–6% 0,4 % Dryness Process Thickening Dehydration Drying Sludge Volume / Extracted Water Volume Range Name Drainis™ Dehydris™ Evaporis™ Dehydris™ Osmo Evaporis™ LT Process Name Drainis™ Turbo Dehydris™ Lime Evaporis™ LE Dehydris™ Twist 3 3
  4. 4. BIOSOLIDS BIOSOLIDES Dehydris Twist WORKSHOP Dehydris™ Twist 4 4
  5. 5. USES AND POST TREATMENTS Dehydris Twist Uses Uses Post treatments Incineration Landfill • Dryness close to self-sustaining Agricultural use level with no addition of lime• Reduction of cake volume • No recycling (low temperature • Reduction of cake volume• Use of settled soil (drinking drying, belt-drying) • Improvement with lime-treated water) as covering soil settled earth in landfills 5
  6. 6. IN PARTNERSHIP WITH BUCHER: THE PISTON PRESS The piston press is a patented technology that was initially designed for solid-liquid separation in the agro-food sector, with more than 2,000 references. Its application to wastewater treatment sludge (drinking water and wastewater) makes it possible to reach a particularly high-level of dryness. In order to more widely deploy this sludge Closed cylinder piston unit dehydration innovation, Degrémont and Bucher Unipektin signed an exclusive partnership contract in June 2011. 6
  7. 7. OPERATING PRINCIPLE (1/2)The principle is based on the application of high pressure on the sludge in acylindrical chamber with a hydraulic piston.The uptake of the interstitial water is through flexible cylindrical drains(sleeve of filtering cloth on a polyurethane rod) mounted in a cluster betweenthe bottom of the chamber (cylinder) and the piston. Filtration Membrane Filter Cake Filtrate Flexible drain 7
  8. 8. OPERATING PRINCIPLE (2/2) Duration of a cycle: 2h to 3h depending on the type of sludge 1 SUPPLY PHASE 2 PRESSING PHASE 3 DISCHARGE PHASEThe cylinder is closed and the The piston continues its back-and- The envelope of the cylinder slidescylinder/piston unit is put in forth motion while the cylinder/ in the axis of the machine,rotation. piston unit is still in rotation: the uncovering a part of the pressingThe piston moves back and forth; breaking of the sludge clods chamber. The cylinder/ pistonthe sludge feeding occurs with during the return stroke renews rotation continues while the pistoneach return stroke of the piston the contacts between the sludge moves forward. The dehydrateduntil the nominal volume of dry and the filtering medium, which sludge cake fall by gravity aidedmatter is reached. facilitates the release of the by the drains which tip over duringThe sludge filling is automated interstitial water trapped during the rotation. The emptying occurswith concentration and flow the pressing. over the course of a few minutesmeasurements. The phase stops on a value of the with no outside intervention. stroke of the piston calculated by the automatic system with respect to the input dryness and the volume of water extracted. 8
  9. 9. BIOSOLIDS BIOSOLIDES Dehydris Twist ADVANTAGES Dehydris™ Twist • 100% automatic operation with no staff present, including emptying • High productivity: 24 hours/day, 7 days/week operation possible with a base of 8,000 hours/year taking maintenance requirements into account • High dryness with no addition of lime (wastewater sludge close to autothermicity before incineration) • Compactness greater than that of a press filter • System easy to operate: - Ergonomic process - Covered piston press 9 9
  10. 10. CASE STUDY (1/3): CHATEAUBOURG, FRANCECONTEXT: • 600 m3/h drinking water plant • Client: Syndicat Mixte des Eaux de la Valière (SYMEVAL) • Commissioning of the plant: End of 2012 • Type of water: surface water StorSITUATION: age • As the raw water had a high level of organic matter and pesticides, the client sought an appropriate treatment adapted for the final use of the sludge. The soil-spreading approach that was initially planned involved large sludge treatment and storage facilities. Degrémont therefore proposed a multi-use solution. 10
  11. 11. CASE STUDY (2/3): CHATEAUBOURG, FRANCEDESIGN: • WATER LINE: - Remineralization, clarification, carbon contact reactor, filtration on sand, ultrafiltration • SLUDGE LINE: - Storage of sludge in a tank before pumping - Thickening and storage in a static thickener, - Pumping of sludge and then dewatering by Dehydris™ Twist, - Storage in hoppers. 11
  12. 12. CASE STUDY (3/3):CHATEAUBOURG, FRANCE Storage 12