Water Journal : Water Journal September 2011
water SEPTEMBER 2011 107 THE INVENT iDISC® FINE BUBBLE DIFFUSER INVENT designs, manufactures and globally implements innovative machines and processes for the treatment of water and wastewater. The company has now launched the iDISC® fine bubble diffuser as the latest product addition to its aeration and mixing range. The iDISC® membrane is manufactured from low volatile EPDM perforated with slits. Fine air bubbles with diameters ranging between 1 to 3 mm are formed when the air passes through the slits of the membrane. The slits open when compressed air is supplied and closes when the air supply is stopped. The membrane is mounted on a removable support plate. The air distribution ports in this support plate are positioned at the periphery so as to avoid direct air impact to the membrane and to enhance air distribution over the complete surface. The membrane and the support plate are fixed by protection anti-wear and screw-on rings to the main body. Within the main body there is a critically sized orifice and an additional non-return valve. The orifice assures even air distribution between diffusers, while the non-return valve provides an additional level of protection against ingress of water into the air supply piping. The main body is secured onto standard 90OD and 3" pipe with a wedge piece. These special design features and manufacturing criteria result in a robust, reliable and long- lasting aeration device. Membrane Disc Material: Low volatile EPDM Air Flow rate: 1.5 to 6 Nm3/h/diff. Membrane Diameter: 237mm Disc Surface Area: 0.044m2 Number of Slits: 3850 Dynamic Wet Pressure: 2 to 4 kPa Acetyl Sliding Ring An anti-friction ring of poly acetyl, which is a self-lubricating material, is interposed between the membrane and the screw-on ring. The purpose of this sliding ring is to diminish the friction wear and avoid the risk of the membrane bonding with the screw-on ring. It also allows easy replacement of the membrane after years of operation. Diffuser Body Construction material of the iDISC® diffuser is polypropylene + glass fibre, allowing design temperatures of 100ºC. Each component is designed and manufactured for heavy-duty applications. The material is a result of specific studies and the special blend has a density of 1.13 kg/dm3 that dramatically decreases the buoyancy effect. Check Valve Every iDISC® diffuser has a non-return membrane check valve installed onto the air- incoming orifice at the base plate of the main body. The design of this key component assures even air flow distribution into the main body and controlled pressure loss over the whole aeration system. Also, it prevents the liquid back flow when air is stopped. Support Plate The support plate has a robust shape that avoids deformation through the whole lifetime. This base plate is manufactured in PP with a high content of fibreglass to withstand high temperatures. The air inlet ports of the base plate are at the periphery, achieving a smooth and uniform air distribution below the membrane. Piping System Every iDISC® diffuser is fixed mechanically to the air pipe with a saddle piece and wedge piece which allows an easy disassembly and reinstallation of each diffuser individually. No glue, screws or other type of fasteners are used for the installation. The piping system comes standard as a "kit". All components required for installation are included in the delivery. Condensate Drainage The iDISC® aeration system is designed as a closed loop system. The outer end pipe collects the condensate water from every air distribution pipe. The venturi coupling self-drains the condensate water accumulating in the piping system above the water surface of the basin. new products & services PIPING • SYSTEM • SOLUTIONS Don't put your project at risk. Choose Victaulic. • Inventor of grooved-end technology • NEW labor-saving products such as the patented QuickVic coupling (www. victaulic.com/quickvic) • Designed for piping systems up to 60"/1500mm (www.victaulic.com/ advancedgroovesystem.htm) • Vertically integrated coupling, fitting and valve manufacturer in the market • Nearly 500 factory-direct sales engineers globally for support and field training • 3:1 safety factor • Full range of products for the water market • Estimating, pre-planning and project management, jobsite training, software solutions, and construction drawings. To learn more about our products visit www.victaulic.com/content/ watersystemstechnology.htm The iDisc.
Water Journal November 2011
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