Effective mixing requires dissolving enough gas into a liquid to adequately eliminate dead spots in
the basin, ensuring that the entire basin volume remains at proper gas levels. Most mixing methods perform poorly at
the basin bottom and therefore rely heavily on strong effort to move gas-depleted liquids from the bottom of the basin to
areas where liquid is needed.
BASINS
The Add-o-mizer processes water outside the basin
oxygenating under pressure. The water is then returned to the bottom of the basin via a distribution system specifically designed
to the individual basin to ensure thorough circulation and aeration.
AERATION
The
system under pressure can achieve dissolved oxygen (DO) levels far higher than possible in an open basin. The Add-o-mizer
system aerates by dissolving the feed gas into the water under pressure. This often makes aerating with air rather than oxygen
very cost-effective.
MICROBUBBLES.
As the processed effluent is sufficiently
supersaturated with oxygen, excess dissolved gas will flash to vapor upon return to the basin. By controlling the level of
super saturation, the size of these “microbubbles” can be controlled to less than 5 microns in diameter - 0.005
millimeters! Slow rise rates of 0.2 to 0.8 cm/sec combined with a surface-to-volume ratio more than 1000 times higher than
that for fine bubble diffusers. This makes microbubbles a very efficient mechanism of oxygenation with minimal operating and
maintenance costs.
EFFICIENCY
Blower / diffuser – type
aeration systems aerate at relatively low efficiencies. As a result, air must be supplied in great excess in order to ensure
adequate dissolution of oxygen. With a (generous) oxygen transfer efficiency of 15%, a blower system must pump 374 cubic feet
of air into water to dissolve 1 pound of oxygen. In order to dissolve the same 1 pound of oxygen into water, an Add-o-mizer
system only needs to inject 11 cubic feet of air.
FLOTATION
Due
to their small size and extremely slow rise rate, microbubbles are remarkably effective in floating both organic and inorganic
dissolved solids. This makes the Add-o-mizer a valuable enhancement to the dissolved air flotation (DAF) process.