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AERATION DIFFUSERS


Stamford Scientific International, Inc. (SSI)

Whatever the application for your diffusers, WE have you covered.  Whether you are looking for stainless, duck bill or membranes, complete system or diffusers, fixed or removable grid systems, Stamford Scientific produces the highest quality systems available on the market today.  In a business environment where the others have sent production overseas, Stamford Scientific has brought their production to the US, producing products manufactured to the highest levels of quality available on the market today.  

Stamford Scientific manufactures disc diffusers with compression molded membranes. Standard materials are EPDM and fluoroelastomer layered EPDM. Compression molding ensures a diffuser with even specific gravity and uniform tear resistance. The tear resistance of a compression molded part is multidirectional, which is typically not found in injection molded unidirectional parts.  Their manufacturing process ensures emulsifying fats cannot leech plasticizer and cause shrinkage and increase hardness, nor are their membranes at risk of flexure failure.

SSI has the experience to recommend/design your complete aeration equipment.  SSI offers complete design services, including 2D and 3D drawing generation and recommended layouts for different system configurations and processes.  


SSI has significant experience in process including empirical and lab data on alpha factors, oxygen transfer efficiency and fouling factors. This data can be applied to a variety of processes, such as extended aeration, BNR, SBR, MBR, MBBR as well as conventional activated sludge, in plug flow or complete mix tanks, and with or without channel velocity from flow boosters.They utilize in-house calculators as well as Biowin™ software to simulate system performance and to tweak their designs prior to presenting them to clients.

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Download the Engineering Catalogue

Membrane Diffuser Materials and Coatings -  The Secret to Maintining OTE and Minimizing Maintenance


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One year pilot test results Competitors EPDM vs PTFE SSI diffusers
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Competitors Diffuser has irreversible creep, deposits, and OTE loss.
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SSI's PTFE coated diffuser showe no scaling or visible creep after the one year pilot
SSI has set themselves apart in the marketplace with their R&D in specialty Coatings.  They have pioneered and patented technology that prolongs the effective life and oxygen transfer efficiency well beyond standard EPDM, resulting in significant life cycle energy and maintenance savings.   Standard EPDM membrane failure occurs well before physical rupture of the membranes.  Plasticizer leach into the liquid stream causes unrecoverable creep and cause irreversible loss of oxygen transfer efficiency.  Protecting the EPDM with chemically bonded coatings limits this leaching and protects the diffusers from failure issues.  The picture of the two membranes was taken by a customer with a competitors membrane, both in service for the same time.  The PTFE coated EPDM diffuser required no cleaning, the competitors diffuser had been scrubbed and still met the owners definition of failure in their system.
 
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EPDM
EPDM is a synthetic rubber which is custom molded for this application. The compound formulation and molding technique are critical to ensure that the membrane maintains its physical properties over a long period of time, resists tearing, retains its shape even after years of continuous or cyclical use, and produces fine bubbles, all at a minimal head pressure.  Our EPDM membranes are field tested in municipal and industrial applications with excellent results.

Standard EPDM is not recommended in cases where solvents, fats oils or greases, or high concentrations of other foulants are present. membranes are field tested in municipal and industrial applications with excellent results.


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PTFE
Developed in 2004, and protected by patent thereafter, the PTFE-coated EPDM membrane is now proven technology. SSI pioneered and patented the use of thin film surface layers of Fluoroelastomers permanently joined to the surface of an EPDM or other substrate base material.  Industrially, this product is a "must have", and has become the industry standard in pulp and paper, dairy, refinery, carbonated beverage, and landfill leachate applications. Municipally, it is used by major cities worldwide due to the anticipated life cycle cost benefits and reduced maintenance. 
For more information on our PTFE product visit this page.


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fEPDM™
fEPDM™ membranes were developed in 2007 as an answer to those few cases where solvents were present and posed a risk to PTFE-coated membranes. In practice, they have outstanding chemical resistance similar to Viton®. A significant additional benefit of fEPDM™ membranes is that the entire outer surface area of the membrane is protected. This proprietary process also treats and protects the inner slits!


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Viton ®
This material has been used successfully by SSI in a few applications where budget constraints were not an issue. The membrane works very well, and is highly resistant to most foulants and chemicals. Viton® typically costs 10x the cost of EPDM membranes.


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Webbed Urethane
Developed in 2009 with patent protection filed for in 2010, SSI's webbed polyurethane membrane provides outstanding chemical resistance and excellent creep resistance. Available with either standard or micro perforations to produce fine or ultra fine bubbles, this membrane material is suitable for municipal or industrial service.


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Silicone
SSI does produce silicone discs and tubes, as well as polyurethane tubes, however we much prefer the characteristics of the fluoroelastomer layered membranes, since both silicone and polyurethane have a tendency over time to suffer from tearing due to flexure failure, which is something that does not significantly afflict EPDM membranes. Neither polyurethane nor silicone is suited to cyclical operation, and neither offers a cost benefit over fluoroelastomer layered EPDM membranes.



Fine Bubble Diffusers (Hover over image for Details)


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EPDM Disc Diffusers Standard 9" Disc - AFD270
Design Flow: 1.5-3.0 SCFM
Flow Range: 0-7 SCFM
Slit Quantity: 6,600

Standard 12" Disc - AFD350
Design Flow: 2.5-5.0 SCFM
Flow Range: 0-12 SCFM
Slit Quantity: 10,155
Learn More

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EPDM Tube Diffusers SSI manufactures tube diffusers with saddle or nipple connections to pipe, in a variety of lengths, diameters, and membranes. 21st century special materials, such as PTFE-coated surface layers, fEPDM™, anti-static EPDM, webbed urethane, as well as reinforced and coated ultra fine bubble membranes, offer outstanding chemical and fouling resistance, in addition to the highest oxygen transfer efficiency at a headloss you can live with. We also make replacement tube membranes competitively priced for other manufacturers products. Learn More

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POD Diffusers The POD system comes completely assembled on the pipe from the factory assuring efficient, leak-free operation. POD systems are available to mount on any 4",3", or 2" round pipe as well as 80x80mm and 50x50mm square pipe. Diffuser body is mounted on the piping using a patent-pending flared pin. With the POD system's unique single-deep buttress thread the POD offers optimal security while still permitting users to easily change membranes if needed. The POD system comes fitted with SSI's 9" disc diffusers and is available with any of our membrane materials.

POD systems are expected to allow contractors labor savings as much as 50% when compared to standard systems. Typical systems have an installation rate of about 5 diffusers per man hour. With the POD system installation rates of up to 30 diffusers per man hour are possible for a complete system including pipe work.
Learn More


Coarse Bubble Diffusers (Hover over image for Details)


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Coarse Wide Band Diffusers Design Flow: 10-40 SCFM
Flow Range: 0-40 SCFM
Hole Quantity: 44
Length: 24"
Our Wide Band diffusers are available in 304L or 316L stainless steel. Made with cast endcaps welded all around, deflectors are supplied with each diffuser but can be removed. The coarse bubble diffuser is intended to be a clog-free design, with oxygen transfer rates of 0.5 to 0.8% per foot of submergence (1.7 to 2.5% SOTE/m).
Learn More

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Snap Cap Diffusers Design Flow: 3-6 SCFM
Flow Range: 0-10 SCFM
Slit Quantity: 10 x 5mm Ø holes
Caps are most commonly used in aerobic digesters and equalization tanks where high rate oxygen transfer efficiency is not required. They are manufactured from black Acrylic plastic containing UV protection and membranes are made from the same EPDM compound that SSI uses in fine bubble disc diffusers. SSI Coarse Cap diffusers have a ¾" MNPT thread.
Learn More

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Relia-Bill™ Duck Bill Diffusers The Relia-Bill™ coarse bubble jet diffuser is a non-clog type that automatically closes and seals completely when air is turned off. Unlike stainless steel wideban-type diffusers, this model will not be clogged by rags in the tank. SSI Relia-bill diffuser unit has an operating headloss of approximately 5-10 inches of water when operated in normal airflow ranges (0 to 10 scfm normal). Learn More


Aeration System Accessories (Hover over image for Details)


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Pressure Monitoring Throughout the life of an aeration system, oxygen transfer efficiency may decline somewhat when diffusers become fouled, but headloss can increase dramatically which in turn increases energy costs. A pressure monitoring system enables the operator to better determine the optimal cleaning frequency of membranes. The fouling rate can very by aeration zone, hence it is recommended to install at least one system in each zone. Learn More

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Moisture Purge An airlift type purge system is used in all SSI fine bubble aeration systems to remove condensate from the piping system. Purging entrained water helps ensure even air distribution to all diffusers in a grid. A ball valve is supplied with the system and is opened manually. Continuous purge systems are available for retrievable-type aeration systems, or where it is not possible to fasten a purge line to a tank wall. Learn More

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Acid Dosing Systems In-situ Acid Dosing Systems are available to control calcareous deposits in the perforations which will reduce membrane back pressure. Learn More


Replacement Disc Diffuser Membranes


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SSI is the leading aftermarket manufacturer of replacement membranes for other diffuser brands. Diffuser membranes are produced with the same high quality materials used to produce their own products and their patent pending PTFE or Viton™ layered EPDM is available as an option.

Their membranes are field tested in municipal and industrial applications with excellent results.

Products by Manufacturer:

  • Sanitaire™ Replacement brand disc diffusers (ceramic or membrane replacement).
  • EDI™ Replacement brand disc diffusers.
  • Nopon™ SSI manufactures disc retrofit membranes for both 215 and 300 sized diffusers.
  • Roediger™ brand disc diffusers.
  • Envicon™ SSI manufactures disc retrofit membranes for both 215 and 300 sized diffusers.
  • Envirex™ 20”/Nopon 500mm dia discs
  • Degremont™
  • US Filter/Envirex™
  • Ecologix™
  • Aercor™


Replacement Tube Diffusers


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Products by Manufacturer:

  • Gummi Jaeger ™
  • Envicon ™
  • Rehau™
  • OTT™
  • EDI™
  • Supratec ™
  • Degremont ™
  • US Filter/Envirex ™
  • Ecologix ™
  • Wyss ™
  • Aqua Aerobics ™
If you don't see the name of your brand here please contact us for details. It is likely they can or do make replacements for your brand.  

SSI is not affiliated with any of the above companies and the products they manufacture to retrofit these brands are neither original OEM equipment nor are they specifically approved for use by these manufacturers. 

Read More...


Central/Eastern Virginia
Winschel Environmental, LLC
Glen Allen, VA 23060
Phone: 804-545-3115
Fax: 804-915-8982
Contact: Matthew J. Winschel, PE
mwinschel@winenv.com
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Western Virginia
Winschel Environmental, LLC
Buchanan, VA 24066
Phone: (540) 632-0111
Fax: 804-915-8982
Contact: Gary Rookstool, PE
gary.rookstool@winenv.com
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