The Jet Aerator from Flygt - Water Solutions

The Jet Aerator from FlygtFor improved wastewater treatment

Treating all forms of wastewaterrequires the right experienceAs the world’s population rises and urbanisationincreases, the scarcity of water becomes more of athreat. Much of this problem can be directly relatedto the failure to properly treat wastewater. It is everyone’sresponsibility worldwide, to ensure that this“borrowed” water is released back into the environmentproperly treated.Treatment processThe most common and effective way to treat wastewateris the activated sludge process - a concentratedversion of nature’s own method. Utilising oxygen,bacteria and micro-organisms reduce organic material,measured as Biochemical Oxygen Demand (BOD)or Chemical Oxygen Demand (COD). Reduction ofnutrients, phosphorous and nitrogen is also possible.necessary information to ensure that you get the rightequipment for your aeration needs.The jet aeratorThe jet aerator has been specifically designed for usein small to medium sized tanks and basins. It is easyto install, operate and maintain, with no need for anycompressors.The self contained unit can handle a series of tasksincluding BOD/COD reduction, mixing, homogenisation,odour control and oxidisation.Aeration techniqueDue to the large amount of oxygen needed in theaeration process, oxygen has to be constantly addedto the wastewater. This can be done by injecting eitherair or oxygen gas into the water.Flygt provides several different aeration products,ranging from self contained units to fine bubblediffused systems, complete with compressors, pipesand control equipment, for wastewater treatmentplants.ExperienceSuppliers of aeration systems must have a thoroughknowledge of the treatment process, and have experienceat calculating critical oxygen requirementsto supply the best equipment needed.At Flygt our engineers have been working with suchcalculations for many years and they can provide the

Confidence in the right system1.2.The jet aerator is particulary advantageous in small and medium sizedracetrack or rectangular aeration tanks in wastewater treatment plants.This is also applicable to industrial plants, where ease of installation,maintenance and flexibility of operation, rather than immediate efficiency,is required. And unlike other aeration systems the jet aerator doesnot require any blowers, air distribution piping, control valves orrelated equipment.Versatile systemThe jet aerator is manufactured to be as flexible as the rest of theFlygt product range. It can be used in almost any size or shaped tankand in order to provide the best efficiency, Flygt submersible pumpsare connected to the jet aerator as standard. Each jet aerator can befitted with the most efficient pump and number of ejector pipes(1-4) to suit a specific tank.A jet aerator can be installed without emptying a tank or basin.Maximum effectFulfilling all treatment process requirements is dependent on theeffective aeration and mixing of the liquid. In order to select theproper aeration system; the Standard Oxygen Requirement (SOR)must be calculated, and the necessary mixing requirements must bedetermined.3.The process oxygen requirements are influenced by wastewatercomposition, selected process regime, loading, temperature, pressure,aeration device and mixing requirements.Installations in activated sludge plants (illustrations are not drawn to scale)1. Rectangular aeration tank. 2.Oxidation for odour control or increasing dissolved oxygen content. 3.Racetrack or oxidation ditch.

Secondary flow (air)The jet aerator ejector principleA Flygt submersible pump generates the primary flow(liquid) in the system. As it passes into the suctionzone, the flow rate accelerates, lowering the pressure,resulting in the secondary flow (air) being drawn downinto the ejector.This causes turbulence in the mixing zone where theprimary and secondary flows are combined into aliquid jet containing fine air bubbles. This shoots outof the nozzle and around the tank.With free movement of the jet the contact timebetween oxygen and liquid is optimised.Flygtsubmersible pumpMixedflowSecondaryflow (air)MixingzoneSuctionzoneNozzlePrimary flow (liquid)N pumps2-19 kg O 2 /h 50Hz2-21 kg O 2 /h 60HzN pumps20-31 kg O 2 /h 50Hz23-37 kg O 2 /h 60HzN pumps29-48 kg O 2 /h 50Hz38-63 kg O 2 /h 60HzN pumps38-66 kg O 2 /h 50Hz38-66 kg O 2 /h 60HzThe different available combinations of the jet aerator provide the standard oxygen transfer rates (listed beside each unit) at water depths of1-6 meters in clean water.

The Flygt advantageFlygt products offer a lot of advantages as theyoperate submerged. This includes taking up no spaceabove ground and being out of sight. In fact the onlypart of the jet aerator unit which is visible, is the airintake valve.The larger jet aerators also come with a Flygt N-pump,with patented N-technology that results in sustainedhigh efficiency.Reduced costsThe jet aerator does not require special housing or asuperstructure to support it, as a result construction costscan be reduced by as much as 60%. The self containedjet aerator can be repositioned as necessary to achievemaximum operating efficiency in any basin, regardlessof size or shape. And the submersible Flygt pump, whichpowers the system, lowers operating costs.Non cloggingThe ejectors’ large nozzles allow solids to pass throughthem easily without clogging. The revolutionary designof the N-pump with its self cleaning impeller, reducesthe risk of clogging further.Controlling the costs of operationFurther savings can be made by using the jet aeratortogether with Flygt’s control systems, which have beendeveloped to save time and costs in the operation andmaintenance of submersible products. They provideyou with reliable and efficient remote monitoring andcontrol of your aeration system.Effective mixingIf extra motion is needed in the tank, the Flygt rangeof submersible mixers provide powerful and efficientmixing, whatever size of tank you have. Flygt mixershave specially designed propellers that generate amaximum of thrust with a minimum of kW input.Technical specificationsTo find out more about the jet aerator contact yourlocal Flygt sales office for a copy of the technicalspecifications.Improved working conditionsThe jet aerator does not cause spray or dispersion ofliquid particles in the atmosphere, minimising contaminationof the air and area surrounding the tank. Also,once submerged the system operates silently.Worldwide service networkNo two treatment tanks, basins or aeration systemswill be alike, so the level of maintenance and supportthat you require from your service partner will differaccording to your situation. With Flygt, you canchoose the type of support package that preciselymeets your needs.From simply supplying products to your specifications,to full service assistance on system planning, design,construction, implementation, operation or maintenance:Flygt’s total service concept means that you getthe service you need, on your terms.

Flygt is a leading supplier of fluid handling solutions. Our products are usedeveryday in wastewater treatment plants, sewage systems, aqua-agriculture, theprocess industry and numerous other applications.With over 50 years of experience in the submersible liquid handling market, Flygtcan provide the knowledge needed to ensure you get the best efficiency fromthe jet aerator. We can also supply monitoring and control equipment, which isdesigned specifically for use with submersible pumps and mixers.Flygt is represented in over 130 countries and has more than 40 sales companiesaround the world.www.flygt.comJet aerator.02.02.Eng.1M.11.04 894463 Trosa Tryckeri AB 51110