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Iso disc
- 2. • Any Disk Can Be Isolated&Monitored Individually • No Rotating Parts or Seals • Linear Backwash Mechanism Provides Uniform Media Cleaning • Square and Rectangular Disks with 100% Active Filtration Area • Extremely Small Footprint to Flow Ratio • Ultra-Low Reject Rates • Easily Expanded • Continuous Filtration During Backwash & Filter Maintenance • 100% Media Life • No Hoist or Crane Required • Optimized Design for Phosphorus Removal Applications INTRODUCING ISO-DISC™ GENERATION II BETTER FILTRATION LOWER OPERATING COSTS TIGHTER FOOTPRINT The ISO-DISC™ Disk Filter is a continuous operating system that utilizes a fixed filter disk and a linear backwash system which provides a uniform backwash flux across 100% of the available media area. Controlled by a PLC or relay logic control panel; all internal or submerged components are corrosion resistant stainless steel or non-metallic materials. The fixed-disk design permits removal of each individual disk while the filter remains in operation. The filter disks remain fixed while the linear backwash manifold moves in a vertical motion removing solids from both sides of the filter cloth. At the beginning of the timed backwash cycle, which is initiated by headloss across the filter, electronically actuated valves segregate the backwash manifolds and clean the filter disks in a predetermined sequence. This insures complete cleaning of the filter cloth while minimizing the rate at which backwash water is returned to the treatment facility. The double-sided cleaning manifold allows for tight disk spacing making the ISO-DISC™ Disk Filter the most compact filter available. This feature makes this system very attractive for large flow wastewater treatment plants, small package plants and ideal for retrofit applications such as traveling bridge filters and moving bed media filters. Performance of the ISO-DISC™ Disk Filter is second to none. The cloth is capable of solids capture down to 10 micron without having to build up a filter mat and does not require any run-in time. The multi-layer cloth is supplied as two specific dimensioned sheets for each disk that can be replaced and re-installed in a matter of minutes, all while the filter continues to function without interruption. State-of-the-Art Design Includes Latest Operation Features Tertiary Filtration Water Reuse Process Streams Surface Water Treatment Municipal & Industrial Applications: The ISO-DISC™ Disk Filter can be installed into concrete structures (supplied by others), or factory supplied stainless steel, carbon steel or FRP tanks. The ISO-DISC™ Disk Filter has a distinct advantage incorporated into its design that allows filtrate sampling from each disk individually. This also allows for removal of an individual disk from the system without filter shutdown. The ISO-DISC™ Disk Filter eliminates submerged rotating seals and mechanisms; ensuring filtrate quality; guaranteeing no cross-connection between influent and filtrate; and reduced maintenance costs. Effluent ISO-DISC™ Filtration Cloth in Place Backwash Manifold ISO-DISC™ Disk Filter Internals Backwash Pumps Backwash Piping Influent Effluent Underdrain Linear Backwash Manifold Effluent Trough Backwash Mechanism Drive Unit * Patent Pending
- 4. www.alfalaval.com © Alfa Laval Slide 1© Alfa Laval Slide 1 ISO-DISC Filter 6A 6A6BUV Chlorination Intermittent Filter Backwash to Headworks Disinfected Effluent to Plant Outfall Typical Municipal Wastewater Treatment – Process Flow Diagram
- 5. www.alfalaval.com© Alfa Laval Slide 2 Fixed Angular Cloth Media with Dynamic Bi-Directional Linear Backwash Mechanism influent Pump suction for backwash effluent ISO-DISC Description
- 6. www.alfalaval.com© Alfa Laval Slide 3 Exploded View – Filter Plate Anatomy 304SS filter cell frame FRP media support grid Cloth media Neoprene gasket 304SS batten
- 7. www.alfalaval.comSlide 4 Filter Plate Cassette Isometric with (3) filter plate construction Gear drive motor Screwjack Screwjack gear Backflush manifold 304SS frame Backflush shoe
- 8. www.alfalaval.com ISO-DISCTM Advantages • Outside In Filtration • Cloth = depth filtration vs. screens • Completely submerged filter media • Any filter plate can be isolated & monitored individually • No Rotating parts/mechanical seals below the water surface • Bi-Directional Linear backwash mechanism provides uniform media cleaning • Offered with square or rectangular filter plate configuration (unique in industry) • Easy fit into existing basins • Nominal cloth media area is equal to the effective filtration area • Small footprint to flow ratio • Ultra-Low Reject Rate (1 - 3%) in TSS removal applications • Low Driving Force Requirements: 12” (30-cm) of water column • Easily Expandable to Increase Filtration Capacity • Continuous Filtration During Backwash & Filter Maintenance
- 9. www.alfalaval.com© Alfa Laval Slide 6 City of Aledo, TX – Tertiary Filters for AS-H SBR Plant Model: IDDF-5D60S-304SS (with (5) 5’x5’ filter plates) Average & Peak Design Flow Capacity: 1.17 & 2.34 MGD (4,432 & 8,864 m3/d) Dimensions: 12’ long x 7’-5” wide x 9’-3” tall (3.66 m long x 2.26 m wide x 2.82 m tall)
- 10. www.alfalaval.com Expected Performance of the ISO-DISC • The ISO-DISC Cloth Media Filter can typically produce a tertiary plant effluent with the following quality: – Total Suspended Solids, TSS: < 5 mg/L – Biochemical Oxygen Demand, BOD5: < 5 mg/L – Total Phosphorus, TP: < 0.1 mg/L* – Effluent Turbidity: < 2 NTU *with chemical pretreatment and also depending of the influent TP concentration of the secondary effluent
- 11. www.alfalaval.com Cloth disk filter Benefits vs. competitors • Simple, robust design • Completely submerged disks use all area all the time • No rotating underwater seals • Disk area = 100% active filtration area • Outside à In filtration • Cloth media = depth filtration vs. screens • Linear backwash mechanism provides uniform media cleaning • Continuous filtration during backwash or maintenance • Each disk can be isolated and monitored individually • Square or rectangular disks easily fit into existing basins • Low driving force requirement (30cm water column)
- 12. www.alfalaval.com Iso-Disc key features 1. Linear backwash system – Clean entire surface – Uniform cleaning – No tip speed such as with rotating systems – Lower backwash flows = lower operating costs due to less pumping 2. Isolate the disks – 100% use of the cloth life – Monitor turbidity and throughput – Potential for significantly reduced redundancy for lower capital and op costs 3. Compact – Use 100% of filter area not just the lower area such as screen type – Lower capital costs including installation 4. Outside to In Filtration – Easier access – Easier maintenance 5. No rotating underwater seals – Low maintenance
- 13. www.alfalaval.com ISO-DISC product comparison © Alfa Laval Slide 10 On-Line Filter Plate Isolation No Rotating Clean Water Seals On-Line Filter Plate Removal Fixed Filter Plate 100% Usable Filter Media Outside to Inside Flow No Spray Cleaning No Mist Cover Filter Plate Fully Submerged Ashbrook ISO-DISC® YES YES YES YES YES YES YES YES YES Aqua Aerobics Aquadisk / Mecana NO NO NO NO NO YES YES YES YES Kruger Hydrotech NO NO NO NO NO NO NO NO NO Siemens 40 – X NO NO NO NO NO NO NO NO NO