Pond Boss Forums INTRO Questions & Observations hypolimnetic aeration

I think the concept can be adapted to smaller ponds that are pretty deep and have a hypolimnion thickness of at least 10ft deep or greater. My term paper for limnology class was about hypolinmetic aeration. I currently can not find the paper.

burgerm wrote: "You guys(ya'll) nearly had Meadowlark and myself convinced several months ago that bubbles don't aerate the water very much, but the forced subjection of the water to air at the surface is where a vast majority of the transfer takes place. You have to put the amount of oxygenation of water by bubbles into context. Bubbles do not put very much oxygen into water COMPARED to photosynthesis and surface agitation. But bubbles can and do oxygenate water significantly under certain conditions such as long contact time of bubbles with water and if the volume of water to be oxygenated is not great. Continual bubbling of smaller volumes with fine bubbles puts dissolved oxygen into water. Usually the volume of the hypoliniion is small in deep, kettle basin, morphometric shaped pond basins compared to the volume of the epilimnion. Thus a smaller amount of dissolved oxygen is necessary compared to the amount needed by the epilimnion. Plus the hypolimnion is cooler and oxygen consumption is less compared to epilimnion demands.

A prototype of Bruce's example above would consist of a vertical pipe (4"-10"dia)anchored at the base and held upright with a float. The side arms should probably come off the side at a downward 45 deg angle and at a depth just below the thermocline. The upper dome (placedat bottom of thermocline) would have a narrow diameter (3/8"-1/2") vent pipe to vent excess air from the diffuser and hypolinmetic gasses. Air diffuser would be at bottom of vertical pipe. Rising water would be oxygenated somewhat as it rises in the pipe and then discharged downward at a 45 deg out the side arms below the thermocline. Continual recirculation of the hypolimnetic water would accumulate oxygen at a rate that is hopefully greater than the BOD of the hypolimnion.

I will look again for my Limnlogy Hypolimnetic Aeration term paper but I am running out of places to look.