10 Questions (And Answers) That May Change the Way You Aerate

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Courtesy of KLa Systems, Inc.

Slot Injector:

  1. How does the slot-shaped nozzle of the Slot Injector™ aeration system improve performance? The slot shaped nozzle and mixing chamber provide a larger shear surface for mass transfer than a circular jet of identical area. This unique shape results in a high percentage of gas dissolution and superior oxygen transfer rates with a 10-20% reduction in energy usage compared to conventional jet aerators.
  2. What are the applications for the Slot Injector? The Slot Injector aeration system is an ideal for both conventional and advanced industrial biological treatment processes where fine screening is a standard treatment operation.  Typical applications include:   equalization tanks, a variety of complete mix activated sludge processes, SBR, MBR, IFAS, and Oxidation Ditches.

Jet Aerator:

  1. Are “jet” aerators common in the industry? What sets yours apart? Like the Slot Injector TM jet aerators are used in a variety of industrial wastewater treatment applications and are ideal for anoxic/oxic nutrient removal processes.  For municipal wastewater treatment, jet aerators are commonly used for mixing and aerating large diameter equalization tanks and aerobic digesters.  Jet aerators are not only excellent oxygen transfer devices but are also powerful hydraulic mixers and that is why they are preferred in these processes.  KLa Systems has a strong commitment to research and development.  We have pioneered a change in the materials of construction of the jet nozzles.  Our liquid propulsion jets are now made out of polypropylene or Kynar PVDF which have superior corrosion and wear resistance compared to standard FRP jet nozzles with silicon carbide liners.
  2. What is standard oxygen efficiency for aerators? How do KLa Jet Aerators compare?  The standard aeration efficiency for jet aerators ranges between 2.5 and 4.2 lb. O2/bhp-hr.    KLa Systems specializes in optimizing the aeration system design so that the aeration efficiency is at the maximum value.   We do this by utilizing deeper aeration basins, custom designing the jet aerator configuration, and selecting the most energy efficient rotating equipment.
  3. How does improved oxygen transfer affect performance? Some years ago we used to work with a consultant who had an insightful statement on this subject;   ”The transfer of oxygen is fundamental to the successful operation of an aerobic biological treatment process. Unless dissolved oxygen is available where and when the microbial system requires it, the process will not function.   However, if adequate oxygen is available, the process will function almost in spite of all other upsetting conditions.  A perfectly efficient, properly designed transfer system must do more than simply dissolve gas in water. The oxygen transfer device is the essential mixer which carries on all the basic mixing functions within the aeration basin.”  This statement perfectly describes the oxygen transfer and mixing components of a jet aerator.

Jet Aerator

Jet Mixer:

  1. What are the key characteristics operators look for in a mixer? From a process point of view proper mixing intensity, good distribution of mixing energy, correct turnover time, and generating an appropriate bulk fluid velocity are very important to insure the jet mixer meets the performance criteria.  For the physical plant the most important characteristics are no moving parts in the basin, low maintenance rotating equipment, corrosion and wear resistance pipe, mixers, pumps, and a +20 year design life.
  2. How does the KLa Jet Mixer deliver on these concerns? Our jet mixer designs meet all of the above requirements and are custom designed for a variety of applications and any basin geometry.  Our designs are supported by Computational Fluid Dynamics (CFD) modeling which we have successfully utilized on many of our projects.

Jet Mixer

General:

  1. What solutions do you recommend for particularly difficult waste streams? KLa Systems works closely with consulting engineers, turnkey contractors, and design/build teams to make sure a complex production facility effluent is well defined so that there are no surprises at plant start-up.  We have a 2000 gallon pilot test tank that we can send out to the plant site to carry out oxygen transfer tests to confirm if there is any mass transfer inhibiting compounds.

We also have a test facility at our location in S.E. Massachusetts, where we evaluate certain types of compounds to see if they inhibit or enhance oxygen transfer.

  1. How do equipment requirements change when going from conventional to advanced biological treatment processes? Advanced processes typically require greater flexibility in design.  Our Slot Injector™ aeration system is ideal for these processes and many of the design changes are in controls and instrumentation.  The most common are dissolved oxygen or ORP controlled liquid recirculation pumps and air blowers which are outfitted with variable frequency drives.  This allows for better turn-up/turn-down capacity which greatly improves process control as well as improved energy savings.
  2. Why buy a “complete system,” and what does that include? A complete system consists of the all in-tank components, recirculation pumps, air blowers, pump recirculation piping system, all required documentation, installation inspection, plant commissioning, and operator training.

Jet Motive Pumps and Centrifugal Blowers

KLa Systems has the most experienced team in the industry and our key personnel across the company have over 30 years’ experience.  We are committed to R&D and this has led to the development of new products, product improvements, and the refinement of the specific application of our products.  What sets KLa Systems apart is our technology, experience, knowledge, and a total commitment to customer service.

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