CLOTH MEDIA FILTER ISO DISC

The Alfa Laval AS-H Iso-Disc is a cloth media polishing filter that enables continuous production of high-purity, reusequality filtrate from various applications. The filter removes organic and inorganic pollutants such as residual suspended solids e.g. to <10 mg/l 95%ile (<5 mg/l 30 day average).
Iso-Disc is a compact, cost efficient alternative to traditional sand filters and other disc filter technologies. It offers a robust yet simple design that can handle hydraulic loadings up to
15 m³/h/m2 and filtration needs from <100 to >20,000 m3/day within a single small footprint-to-flow ratio filter. The performance of the Iso-Disc filter is second to none. The standard cloth media is capable of solids capture to less than 10 microns, with the advantage of outside-in depth filtration for
handling high solids loadings.

Applications:
• Tertiary filtration of municipal and industrial wastewater
• Water reuse
• Process streams
• Surface water treatment e.g. for cooling towers and process water
• Pre-treatment for technologies to produce high purity water
• All industries that require water filtration

The filter can be installed into a concrete structure, carbon steel tank with coating, or a stainless steel tank, and can easily be retrofitted into existing tanks.
 

Design features:
The Alfa Laval AS-H Iso-Disc Cloth Media Filter is engineered as a continuous operating process that utilizes a fixed cloth media and an efficient linear backwashing system that cleans the media
equally across the whole surface area. The cloth media is fully submerged into a tank to allow 100% use of filtration area at all times. 

An Iso-Disc filter incorporates a number of hollow filter elements, designed to handle the actual flow and load conditions. The elements are mounted in a “cassette frame” within the path
of the incoming water. Both square and rectangular cassettes are available to cater for different installation configurations.

All submerged components are corrosion resistant stainless steel or non-metallic materials.

The design of the Iso-Disc allows for individual visual assessment of the effluent flow rate and quality. The filter cloth can be replaced while the filter continues to function without interruption.

As the filtration area is static, there are no rotating seals which can lead to cross contamination if worn.The simple nature of the Iso-Disc and minimal moving parts ensure that maintenance
requirements are kept to a minimum.

Benefits:
• Individual filter element monitoring
• Individual filter element maintenance
• Simple, robust and efficient design
• Reuse quality filtrate and California Title 22   Water Reuse Certification
• Fully automatic outside-in depth filtration
• Small footprint-to-flow ratio
• Easily expanded
• Low backwash water rates
• High hydraulic loading capacities
• Uninterrupted operation during backwashing   cycle
• High hydraulic and solids loading rates
• Simple internal emergency flow bypass