Submersible Ejector Aerator Supplying Dissolved Oxygen for Wastewater Treatment, Lavel Jet Aerator

• After-sales Service: 1 Year
• Warranty: 1 Year
• Type: Aerators
• Method: Biological Treatment
• Usage: Industrial, Agriculture, Hospital, Environment Protection, Chemical
• Units: 4,6,7,12
• Model NO.: HT-WL12
• Application: Pulp&Paper,Landfill Leachate,Chemical Industry
• Material: PP
• Oxygenation Efficiency: up to 35%
• Transport Package: Carton Box & Wooden Case
• Specification: customized
• Trademark: HETAI INDUSTRY
• Origin: Jiangsu, China
• HS Code: 84135010
• Production Capacity: 20000pieces Per Year

Product Description

 

 Multi-channel Vortex Jet Aerator (MJA) (4,6,7,12 Units)

With the continuous development of aquaculture fisheries, intensive high-yielding aquafarming technology has been widely used, fishery farming increased significantly. In the process of aquaculture production increase, aerator has become an essential equipment to achieve high-yield fisheries intensive, plays an important role in the development of fishery economy. Reasonable use of oxygen machine can effectively increase the dissolved oxygen in the pool water, accelerate the pond water body material circulation, reduce or eliminate harmful substances, and promote plankton breeding.

For the prevention and mitigation of fish floating head, to prevent flooding and improve pond water quality conditions, increase the amount of fish fed and increase yield and so have a good role in promoting.
 

Multi-channel Vortex Jet Aerator can be used both on freshwater and seawater.

 

HOW MJA WORK

High-pressure wastewater enters from the inlet pipe at the bottom, distributing evenly into each integrated jet pipe. At the entrance of the jet pipes, a strong vortex is created by a vortex generator, leading to a powerful swirling action.

This swirling flow creates a negative pressure area at the end of the throat pipe due to the high-speed jet as it passes through. Pressurized air is introduced into the air chamber via an air inlet pipe and then directed into the integrated jet pipe through both the air chamber's vent holes and the throat pipe's air inlet.

In this negative pressure zone, air and water make full contact and are thoroughly mixed and dissolved in a swirling state. The mixture then moves into the mixing tube to continue the process of mixing, dissolving, and diffusing, which increases the efficiency of oxygen dissolution.

The integrated jet pipes are angled at 60 degrees relative to the cylinder, causing the air-water mixture that is ejected to strike the bottom of the aeration tank forcefully. This action thoroughly stirs the sediment at the tank's bottom, preventing sludge accumulation in dead zones and increasing the trajectory of microbubbles in the water, which helps to improve the efficiency of oxygen dissolution.

 

 ADVANDAGES

1. Maintenance-free - no moving elements in ejector aerator
2. High oxygen efficiency - Fine bubbles create large contact surfaces between air and water and high turbulence renews these contact surfaces.
3. No deposits - The intensive jet flow directed towards the tank floor prevents deposits of biomass.
4. Straightforward control of oxygen supply
5. Non-clogging construction - The nozzle diameter defines the narrowest flow cross-section.
6. No sealing problems - When the plant is inactive, water can enter the air pipeline without negative effects and when re-started, the ejector's entraining effect expels any liquid in the pipe.
7. Design acc. to requirements - Various sizes can be designed and adapted to requirements.

                         COMPARATIONS TO OTHER AERATION SYSTEMS
 

	Jet-aeration	Micro-bubble air diffuser	Surface aeration
Service life	Long Simple structure and long service life	Short Complex system and short-lived diffuser membrane	Fair
Installation	Easy Easy and quick mounting,	Complex Complex mounting requirement	Difficult Heavy device and difficult to mount
Adjusting flexibility	Flexible Both air and circulation water flow can be adjusted independently.	Only air flow can be adjusted.	Oxygen supply and mixture shall be adjusted simultaneously
Oxygen-supply efficiency	High	Low	Low
Maintenance	Convenient maintenance	Difficult to maintain and trouble-shoot	High rusting risk at air-liquid mixing part, and need frequent overhaul
Blocking  problem	No blocking	Easy to be blocked	--
Mixture of water and sludge	Abundant mixture of water and sludge	Little mixture of water and sludge	Easy to produce short-cut and blind angle
Sludge sediment characteristics	Good Zooglea is compact and active	Fair                           Risk of sludge filamentation bulking is high.	Good Zooglea is compact and active

 

INSTALLATION

     

Multi-path ejectors inside aeration tanks

When equipping an aeration tank with ejectors, there will not be any moving parts in the tank which would require maintenance. The ejector's mechanical stress corresponds to that of a pipeline with a higher flow velocity inside. Roots blowers/compressors and pumps can be installed outside the tank for easy maintenance.

Once the tank geometry, water depth and oxygen requirements have been determined then number, execution form and arrangement of the multi-path ejectors can be adapted to the case in question. Their mounting can be effected quite simply by two flanges in the pipelines for motive flow and compressed air. Installation of compact units on the tank floor guarantees comprehensive aeration and complete intermixture of the waste water.

As material we use polypropylene which has excellent resistance to chemical attacks. For particularly demanding application conditions the motive nozzles as well as also the mixing zones can be made of chrome-nickel steel. When there are high calcium carbonate concentrations in the aeration tank the choice of materials must always be adapted to the operating conditions.
 

Installation from outside through the tank wall

The ejector shown here is made of stainless steel and is mounted „through-the-wall". Its connections for motive flow and compressed air are located outside the aeration tank..

These comparatively large units are equipped with a second downstream mixing zone in which additional liquid is sucked in, so intensifying the intermixing action in the tank.

If required, the ejector can be equipped with a shut-off device downstream of the motive nozzle so that the motive nozzle can be checked at any time without having to empty the tank.

This equipment option allows for a permanent application of the oxygen transfer system, even with extreme concentrations of calcium carbonate in the waste water. Although the relatively large ejectors are inferior regarding oxygen efficiency to our multi-path ejectors with finer air bubbles, their 100% availability is often the decisive criterion for our customers. It is therefore not remarkable that many plants have been realised in the paper industry - sometimes also as a retrofitting action to replace inadequate installations.
 

Oxygen efficiency

As oxygen transfer not only depends on bubble size (contact surface between gas and water) but to the same measure on the renewal of the gas bubble contact surfaces, ejectors - with their permanent circulation of the waste water - can so achieve a far larger oxygen efficiency than other aerators. With their inclined flow direction towards the floor Körting ejectors utilise the respective tank depth completely as entrance depth. Extensive oxygen supply tests in pure water (ATV M-209) acc. to the oxygen adsorption method form the data basis for designing Körting ejectors. All measurements were executed on full-scale plants and confirmed in numerous inspection tests.

At the usual entrance depths of 5...8 m it is possible to achieve an oxygen efficiency OC₂₀ in clean water of 11 g O₂/Nm³ • m. In partial load operation - at a reduced air amount - the oxygen efficiency can be boosted above this value as far as 14 g O₂/Nm³ • m. Depending on entrance depth and oxygen requirements approx. 400-500 Nm³/h of  compressed air can be injected into the tank by one single ejector.


Control range and oxygen yield

Regulation of the oxygen supply is achieved solely by altering the air volume flow. A reduced air supply lowers the inlet pressure to the ejector thereby additionally reducing the power intake of the roots blower/compressor. At the same time the specific oxygen efficiency is increased. The result is a nearly constant high oxygen yield over the whole control range of the oxygen transfer system with its maximum value in partial load operation near the design point. Ejectors are designed - depending on the rheological properties of the activated sludge (temperature, dry solids contents) - for a suitable air/water ratio. The improved performance of the oxygen transfer system by simply increasing the air supply as well as its optimal oxygen efficiency in partial load operation are so guaranteed at all times.

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