THE INDUSTRY’S CHOICE FORHIGH-FLOW+HIGH-EFFICIENCY

MEMBRANE DIFFUSERS

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The products pictured, described, or listed in this publicationare illustrative only and are subject to change as appropriate.

Dura-DiscTM , Dura-TubeTM, and Full-SpectrumTM are trademarks of AshbrookSimon-Hartley Operations LP. Air-CheckSM is a service mark of AshbrookSimon-Hartley Operations LP.

© 2008 Ashbrook Simon-Hartley Operations LP

Printed in U.S.A.

For more information:Visit our website atwww.as-h.com

In North America—Contact Ashbrook Simon-Hartleyat 800-362-9041Fax: 281-449-1324Address: 11600 East HardyHouston,TX 77093-1098

In Europe, Asia, and the Africas—Contact Ashbrook Simon-Hartley, Ltd.at +44 (0) 1782 578650Fax: +44 (0) 1782 260534Address: 10/11 Brindley CourtLymedale Business ParkNewcastle-under-LymeStaffordshireST5 9QH UK

Contact Ashbrook Simon-Hartley, Ltd.at +971 (4) 407 0782Fax: +971 (4) 339 1414DUBAI BranchAddress: P. O. Box 282486DubaiUAE

In South America—Contact Ashbrook Chile S.A.at +56 (2) 224 7858Fax: +56 (2) 224 9525Address: Avenida Presidente Kennedy 5757Torre Oriente, Oficina 501Comuna de Las CondesSantiago, Chile

COMPREHENSIVE SUPPORTFOR ALL OF YOUR AERATION NEEDS

Fine Bubble Dura-DiscTM

Technology

Combines high-flow + high-efficiency technology in aneasy-to-install, long-life,durable disc diffuser.

Wilfley Weber CoarseBubble Technology

Provides maximum coarsebubble efficiency and long-life operation featuringtriple vent air discharge.Stainless Steel with thickcast end-piece.

Open Bottom

Closed Bottom

Fine Bubble Dura-TubeTM

Technology

Combines the efficiency ofa fine bubble membranediffuser with the utility of atube-type diffuser. An idealretrofit for existing tubediffusers.

ApplicationsActivated Sludge Basin Channel AerationLagoon AerationGas & Chemical StrippingRetrofit Existing Diffusers

Aerobic DigestersOxidation DitchReaerationPretreatment

HIGHER FLOWS WITH HIGHER OXYGEN TRANSFER EFFICIENCIESDURABLE CONSTRUCTION & PROCESS VERSATILITY

• High Oxygen TransferPer Diffuser Unit

• Self-Cleaning, Non-CloggingTear Resistant, “I” Slit Design

• Proven Long-TermDurability

• Easy, Fast Installation

• Reduced Overall CostsPer Unit of Aeration

• Permanently LockedMembrane Attachment

• Exclusive Injection MoldedTapered Membrane

• Exclusive Pipe MountingSystem

• Molded Center SeatCheck Valve

• Uniform Bubble Diameterand Pattern

• Low Pressure Drop AcrossDiffuser Membranes

• 1 SCFM to 10 SCFM Efficient Air-Flow Range

WilfleyWeber

Incorporating Advanced

Diffuser Technology

Resilient *Ethylene PropyleneDiene Monomer (EPDM)

Permanently LockedMembrane Attachment

Back Flow PreventionCheck Valve

Self-Cleaning/Non-Clog OpeningsMaintain Long-Term Efficiency

DURA-DISC™

High-Flow+High-Efficiency Membrane Diffusers

No MetalAttachment Parts

EPDM Diffuser Mounting Saddle(Universal Adapter Available For All Types)

Low Pressure DropAcross Diffuser

The best solution is to replace inefficientexisting systems with an energy savingDURA-DISC diffuser system. With thebenefit of an Air-CheckSM AerationProcess Evaluation (an Ashbrook Simon-Hartley exclusive) your existingdiffusers can be replaced and the DURA-DISC system installed with a defined payback. The replacement of

an inefficient oxygen transfer systemwith the energy efficient DURA-DISC finebubble diffuser system will pay for itselfin a relatively short period of time justbased on energy savings. The paybackperiod for your specific installation canbe calculated as a result of the Air-CheckAeration Process Evaluation.

THE INDUSTRY’S CHOICE FORHIGH-FLOW+HIGH-EFFICIENCY

MEMBRANE DIFFUSERSAeration is one of the core activitiesperformed at virtually every wastewatertreatment facility. For this reason, it is apriority to achieve highly efficient oxygentransfer. In addition, capital andconstruction costs dictate the constructionof the minimum in aeration basin space.Obviously, flows are naturally quitevariable, so the need for volume flexibilityis absolutely necessary. Since it isuneconomical to build extra basin space"just in case", it is important to be able tosubstantially increase the flow of air intobasin diffusers and thus increase processspeed. Today, accomplishing both of thesetasks, flow + efficiency, with long-termdurability is possible because ofDURA-DISCTM technology.

DURA-DISC high-flow+high-efficiencymembrane diffusers allow you to achievehigher oxygen transfer in your aeration

basin. This is possible because onlyDURA-DISC diffusers are capable ofoperating across the wide range of SCFMflows (from 1 SCFM to 10 SCFM). ThisFull-SpectrumTM capability allows for themaximum process flexibility associatedwith varying flow conditions. For example:when your process flow increases, you canincrease the SCFM rate and efficientlyaerate larger volumes using the existingbasins. For new facility design, this meansthat you can scale basins smaller andhandle increased flows by simplyincreasing SCFM, effectively multiplyingbasin space by as much as 10 times.

The long-term durability of DURA-DISC atall SCFM levels has been proven overdecades of operation. The tapered designEPDM diffuser membrane is resilient and ispermanently locked to the uniquelymaintenance-free DURA-DISC assembly.

For more than a quarter of a century,Wilfley Weber's advanced diffusertechnologies have been proven ininstallations throughout NorthAmerica. This includes aerationsolutions for virtually every type ofmunicipal, industrial and aquacultureapplication. Over the years, WilfleyWeber has earned an enviablereputation as the leader in high-flow+ high-efficiency oxygentransfer. Wilfley Weber technologiesare available to meet every aerationrequirement, including both finebubble, and coarse bubble diffusers.

Only Dura-Disc diffusers provide long-life operation across a widespectrum of SCFM flows (from 1SCFM to 10 SCFM).

Wide air flow range allows for process versatility in diverse applications.

Exclusive TaperedMembrane

EASY TO RETROFIT TO EXISTING SYSTEMS

Installation is a very simplefour-step procedure, whichmakes it possible to install eachdiffuser in a matter of minutes.This simplicity dramaticallyreduces labor costs associatedwith installation. As the adjacentphotos show; soap is applied tothe saddle; soap is applied to theDura-Disc; then the diffuser ispressed into place and twisted ahalf turn to set the threads.That’s it!

Simple and Quick Installation ProcedureReduces Up Front Costs, Significantly

The benefits of the DURA-DISCTM diffuserare also available for existing aerationbasins with other diffuser technologiesinstalled. The DURA-DISC is easy to

install into existing systems on adiffuser-by-diffuser basis. Retrofit kitsare available for virtually any brand ofdiffuser.

AIR-CHECKSM AERATION PROCESS EVALUATION PROVIDES A DEFINED PAYBACK