Seaclean filter - Protect the core of reverse osmosis membranes with multimedia filtration

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Pressurized multi-media filtration for desalination the clarification of seawater

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Seaclean filter - Protect the core of reverse osmosis membranes with multimedia filtration

  1. 1. Seaclean™ Filter PRESSURIZED MULTI-MEDIA FILTRATION FOR DESALINATION THE CLARIFICATION OF SEAWATER PROTECT THE CORE OF REVERSE OSMOSIS MEMBRANES WITH MULTI-P-PPT-D-003-EN-1004 MEDIA FILTRATION
  2. 2. DESALINATIONDESSALEMENT CONTENTS Seaclean™ Filter Seawater Pre-treatment Objectives Seaclean™ Filter Description Seaclean™ Filter in Treatment Lines Product Performances Advantages of Seaclean™ Filter Case Study: Al Dur, Bahrain 2
  3. 3. DESALINATIONDESSALEMENT PRE-TREATEMENT OBJECTIVES Seaclean™ Filter To maximize the efficiency and lifespan of a desalination plant using reverse osmosis, pretreatment aims to prevent clogging of osmosis membranes by: • removing algae/suspended solids/colloids, • obtaining a low clog power of water. 3
  4. 4. DESALINATIONDESSALEMENT Seaclean™ Filter DESCRIPTION (1/2) Seaclean™ Filter • Seaclean™ Filter is a pressurized horizontal filter that applies a downflow through 2 layers of media: − A top layer of anthracite – A bottom layer of sand • The characteristics of Seaclean™ Filter: – Diameter 4m – Length 12,5 or 16 m – Nominal surface area: 51 m² or 63m² • Backwash is divided in 2 phases: – One air phase – One water phase ANTHRACITE SAND 4
  5. 5. DESALINATIONDESSALEMENT Seaclean™ Filter DESCRIPTION (2/2) Seaclean™ • The innovation consists in applying the new Anthracite / Sand Filter pair while the pressurized twin-layer technique remains unchanged. • The first layer is used to screen out suspended solids. • The second layer is used to reduce the SDI (Silt Density Index) • There are 2 possible media combinations: – Type A combination: Anthracite = 1.5mm / Sand = 0.28mm – Type B combination: Anthracite = 1.2mm / Sand = 0.28mm 5
  6. 6. DESALINATIONDESSALEMENT Seaclean™ Filter IN TREATMENT LINES Seaclean™ Seaclean™ Filter forms part of Reverse Osmosis pre-treatment Filter in seawater desalination line. • Downstream from a flash flotation tank (Seadaf™) on water that has occasional organic matter and algae bloom peaks: Coagulant Coagulant H2SO4 H2SO4 Coag. aid RO Seaclean™ Seadaf™ • In direct filtration application for treating turbidity: Coagulant H2SO4 Coag. aid RO Seaclean™ 6
  7. 7. DESALINATIONDESSALEMENT Seaclean™ PERFORMANCE (1/2) Seaclean™ • FILTRATION VELOCITIES: Filter − Depending on the quality and temperature of the water − Depending on whether or not the clarification stage is included (flotation or sedimentation) FILTRATION VELOCITY ON DUAL MEDIA FILTER * Velocity n : nominal velocity range with all the filters in operation 7
  8. 8. DESALINATIONDESSALEMENT Seaclean™ PERFORMANCE (2/2) Seaclean™ • BACKWASH VELOCITIES: Filter Backwash velocity during water alone phase at 20°C for media combinations. (NES = Nominal Effective Size in mm) 8
  9. 9. Seaclean™ Filter ADVANTAGESDESALINATIONDESSALEMENT Seaclean™ Filter• FILTERED WATER OF A STABLE QUALITY: – Good layer re-grading after washing – Regular cycle times• MINIMIZED DANGER OF MEDIA LOSS: – Thanks to the optimized process (filtration / backwash rate)• WASH EQUIPMENT REDUCED TO A MINIMUM• EFFICIENT REVERSE OSMOSIS PRE-TREATMENT 9
  10. 10. CASE STUDY: AL DUR, BAHRAINCONTEXT:• Client: Hyundai Heavy Industries (GDF Suez Energy Int. / Gulf Investment Corporation 50/50 consortium)• Contract: BOO – Commissioning: 2011• Electricity generating and seawater desalination plantDESIGN:• Drinking water production capacity: 218,000 m3/jour• Treatment line: − Pumping − 14 Seadaf™ flotation units − 44 Seaclean™ units − 26 reverse osmosis racks, 1st pass − Energy recovery (Pelton Turbine) − 12 reverse osmosis racks, 2nd pass 10

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