| Customization: | Available |
|---|---|
| After-sales Service: | 1 Year |
| Warranty: | 1 Year |
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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.
| 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 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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