Need suggestions on efficient ways to atomize air bubbles in a 5L bench-scale water/wastewater treatment unit (Cylindrical column of 10cm dia x 40cm height)
it is sufficient to use air diffusers (aquarium type) steel preferably connected to air pumps with dimmer
that should do
Shahul,
Look for a so-called "frits" (like the aquarium one mentioned by Hakim), you can use also a perforated pipes + effective mixer.
More sophisticated method is to pressurize the gas in the liquid at high pressure (a few or more bars) and than pass it through to a second chamber operated at lower pressure i.e. your colum - the lower pressure will cause spotaneuous stripping of the gas from the liquid.
regards,
G
Dear Shahul,
In water treatment practice, aeration is applied so that water is brought into intimate contact with air for the purpose of changing concentrations of volatile substances contained in the water.
The time factor and the ratio of surface area to the volume of water, A/V are important factors to be considered in designing aeration equipment. One method exposes water films to the air (waterfall type) and other introduces air in the form of small bubbles in the water (diffused air type)
You can therefore use for your experimental work the aquarium diff-user as suggested for 5L bench scale treatment unit. It will be adequate.
If you are interested in waterfall aerator then you can use perforated nozzle fix on your cylinder and allow water to fall from at least a height of 4-5 feet. The time of exposure of each droplet of spray depends upon velocity and trajectory while the size is a function of dispersing action of the nozzle.
If you are bench testing an aerobic biological treatment process, aquarium type diffusers are fine, with the air supply controlled (on/off/rate) to meet your DO requirements of the experiment. The efficacy of aeration equipment for oxygen transfer needs testing at a larger scale.
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