KLa - Jet Aeration System
Jet Aerators transfer oxygen by simultaneously introducing large volumes of high kinetic energy liquid and air through a series of jet nozzles. The high velocity liquid exits the inner, primary jet and rapidly mixes with the incoming air in the outer jet. This intense mixing and high degree of turbulence in the gas/liquid cloud travels outward from the jet along the basin floor prior to the vertical rise of the gas bubble column to the liquid surface.
The hydrodynamic conditions within the jet and fine bubble cloud, produces continuous surface renewal at the gas/liquid interface causing higher alpha factors. This results in superior process oxygen transfer performance in the presence of surfactants, extracellular enzymes, and high MLSS concentrations.
The high alpha factor and clean water oxygen transfer performance of jet aeration technology, results in the most efficient design for industrial and biosolids applications.
KLa jet aeration technology is applicable across a wide range of wastewater and biosolids treatment applications including: Air Activated Sludge, SBR, MBR, MBBR, Oxidation Ditch, Aerated Stabilization Basins, Equalization Tanks, Aerobic Digesters and ATAD.
Oxygen Transfer Efficiency And Energy Savings
In most industrial wastewater and biosolids applications, jet aerators exhibit superior oxygen transfer efficiency compared to other aeration technologies. The hydrodynamic conditions within the jet and fine bubble cloud produce continuous surface renewal at the gas/liquid interface resulting in higher alpha factors. This results in superior process oxygen transfer performance in the presence of surfactants, extracellular enzymes and high MLSS concentrations.
The high alpha factor and clean water oxygen transfer performance of jet aeration technology results in the most energy efficient design for industrial and biosolids applications.
Long Term, Reliable Operation
Recent studies by WERF show that fine pore diffusers have reduced oxygen transfer performance and increased pressure requirements over time and the biggest drop off is in the first 24 months of operation. It is not uncommon for these types of aeration systems to require frequent cleaning and replacement within the first five years of operation.
Jet aeration systems are known for long term, reliable operation. Jets have much larger openings, are fabricated with superior materials of construction and are available with an air lift type back flush system that allows for clearing clogged jets without entering the basin. There are many jet aeration systems that were installed over 20 years ago that are still delivering the excellent results they were achieving the first day of operation.
Jet aerators are easily configured into any basin geometry including circular, rectangular, looped reactors and sloped wall basins. Jet aerators are ideally suited for deep tank processes. The jet oxidation ditch is an example of technology innovation where the combination of a deeper basin design, bottom to top mixing and conservation of momentum combine to make a very efficient treatment process. In this and other applications the independent control of oxygen transfer and mixing is a valuable feature for both process control and energy savings.
The powerful horizontal thrust from the jets allows for complete basin mixing without the need for a full floor coverage design. This makes a jet system much less labor intensive to install. In most Activated Sludge processes the jets can still maintain MLSS in suspension without any air input which is why the technology is an excellent choice for de-nitrification processes.
Reduced Aerosols and Off-Gas
Like all submerged aeration devices the jet aerator does not produce the problematic aerosols associated with surface aerators. Due to the high process oxygen transfer performance unique to jet aerators, they require up to 50% less air input than other diffuser systems. This feature results in significantly less off-gas to be handled providing savings on gas collection and treatment costs.
KLa Jet Aeration Technology
KLa jet aerators consist of two general configurations of jet nozzles mounted on specific distribution systems and are supplied as pre-fabricated, monolithic units. Manifold type jet aerators locate the jets on either one or both sides of a liquid distribution manifold.
Radial jet aerators distribute jets uniformly around the circumference of a central, pressurized chamber. Radial aerators are ideal for circular tank applications.
The aerator configuration, number of jet nozzles and nozzle spacing is designed to efficiently, and cost effectively, maximize oxygen transfer and mixing. Effective spacing of the jet nozzles and aeration headers ensures uniform oxygen transfer throughout the basin as well as optimizing the overall mixing process.
In deeper basins the jet nozzles are often elevated and canted downward, which on large scale systems can offer considerable energy savings due to the reduction in blower pressure.
The jet aerators are constructed of fiberglass reinforced plastic (FRP). FRP is economical, durable, lightweight, highly corrosion resistant, and easily assembled in the field. Our FRP materials and fabrications meet all the latest ANSI and ASTM standards. Our standard structural support systems are fabricated from various grades of 300 series stainless steel.
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