Air Diffusion Systems (ADS)

- Linear Aeration and Disk Modules

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There are two formats of ADS fine-bubble aeration available for your water or wastewater application: linear aeration and the billion bubble per day disk module. ADS linear aeration is ideally suited for flat-bottom basins, providing “grid coverage” of the entire water column. The ADS disk module can be utilized in almost any treatment application, including tanks, rivers, lakes, lagoons, deep bodies of water, and irregularly shaped basins. All ADS aeration is built to withstand the toughest industrial waste, yet is safe to use in clean water applications. Our professional engineering staff can help you select a reliable and cost-effective approach to meet your treatment goals.

ADS Linear Self-Sink Aeration Tubing (SSA)

  • Manufactured using a highly filled virgin PVC compound
  • Contains carbon black to provide UV protection and longevity
  • 0.50-inch inside diameter, 1.00-inch outside diameter
  • Patented (#8,132,794) flat-bottom shape allows tubing to remain upright, preventing bubbles from coalescing

ADS Linear Weighted Aeration Tubing (LWA)

  • Manufactured using virgin low-density polyethylene
  • Contains carbon black to provide UV protection and longevity
  • 0.50-inch inside diameter, 0.625-inch outside diameter
  • Weighted bottom keel allows the tubing to remain upright, preventing bubbles from coalescing

ADS Disk Module

  • 100 feet of our LWA tubing is coiled inside of a 4-foot stainless steel frame and secured with stainless steel hardware
  • 25 feet of our LWA tubing is coiled inside of a 2-foot stainless steel frame and secured with stainless steel hardware
  • Available with 1-foot legs to keep the disk elevated from the bottom

The distinguishing feature of ADS aeration is the use of evenly spaced air cuts instead of closely spaced holes or pores like those of other aeration manufacturers. Several advantages are obtained with the ADS air cut:

  • Each air cut provides 5 fine bubbles per second.
  • They act as a check valve, preventing clogging of the diffuser.
  • This method creates an internal pressure drop of 14 kPa/2 PSI.
  • There is uniform distribution of air across the entire length of the diffuser.
  • It works even when bottom unevenness persists (+/-1.5 feet of undulation).
  • Even spacing prevents bubbles from coalescing and forming larger bubbles.

Several air cut configurations are available, depending on the oxygen and mixing requirements of each application.

  • Triple cut: Air cuts arranged in a spiral fashion on both sides and the top every 1.5 inches. A total of 24 air cuts are provided per lineal foot.
  • Dual side cut: Air cuts arranged on both sides every 1.5 inches. A total of 16 air cuts are provided per lineal foot.
  • Single cut 1.5: Air cuts arranged on the top of the aeration every 1.5 inches. A total of 8 air cuts are provided per lineal foot.
  • Single cut 3: Air cuts arranged on the top of the aeration every 3 inches. A total of 4 air cuts are provided per lineal foot.
  • Ice melting: Air cuts arranged on the top of the aeration every 24 inches.

The mass-gas transfer of oxygen into water is directly proportional to the size of the bubble and its contact time in the water column. Fine bubbles need less energy to create, while providing a much greater surface area for oxygen transfer to occur. The same amount of energy is required to produce a single 1-inch bubble and a million 1/100-inch bubbles. 

In addition, bubbles larger than 1/10 inch in diameter are limited in their mixing capabilities due to the turbulent manner in which they move through water. ADS fine bubble aeration ranges from 1/8 inch to 1/64 inch in diameter, providing efficient mixing and unsurpassed oxygenation.

Fine bubble aeration:

  • Provides oxygenation and mixing throughout the entire water column
  • Suspended solids are settled out and will not be put back into suspension

Forcing a bubble down is difficult and incredibly inefficient. Bubbling from the bottom up ensures oxygen is delivered where it is needed most: at the sludge-water interface.

ADS subsurface aeration works with gravity and buoyancy by delivering fine bubbles from the bottom up. Benefits include:

  • Uniform oxygenation and mixing, providing a superior zone of influence
  • Settles out solids due to non-turbulent laminar flow, slowly digesting them over time
  • Requires 3 to 6 times less horsepower
  • Excellent performance in deep water (10' or deeper)

In comparison, surface aeration has significant drawbacks, including:

  • Works against gravity and buoyancy; it's difficult to force bubbles down
  • Uneven distribution of oxygen and mixing
  • Turbulent non-laminar process keeps solids and sediments in suspension
  • Requires 3 to 6 times more horsepower
  • Poor performance in deep water (10' or deeper)

ADS aeration offers superior oxygen transfer, which was independently tested and certified in 2001 by former federal EPA Advisor Dr. Michael Stenstrom (read the full report here). Three sets of tests were run according to American Society of Civil Engineers (ASCE) standards for oxygen transfer (see the results). ADS fine bubble aeration delivers an oxygen transfer rate of approximately 3% per foot of water depth, standard oxygen transfer efficiency (SOTE).

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