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HOW MUCH AERATION DO I NEED?

OXYGEN TRANSFER IS THE GOAL 

Simply stated, for recreational ponds, you need 1 cubic foot per minute of diffused air per surface acre at 3-5 foot of water depth.   Deeper water requires  less air to get higher oxygen transfer rates, but also requires more power.  More power means more and larger solar panels and higher capital cost.  Risers and floating diffusers keep the bubbles off the bottom of the pond reducing power and oxygen demand while increasing water clarity and air flow.  

OXYGEN DISPERSION & MIXING

Just like adding a drop of red dye to your pond,  high concentrations of dissolved oxygen around a diffuser quickly spread throughout the unobstructed pond.  Bubblers require no additional energy to disperse the oxygen throughout a pond.  If destratification in deeper ponds is needed  you can deploy floating draft tube diffusers to destratify the pond while using the same energy needed for oxygen transfer and avoiding  suspending bottom sediment and increasing turbidity in the pond typically caused by bottom mounted diffusers .

 Oxygen is continuously being produced
by algae and other aquatic plants where the sunlight can penetrate in all small recreational ponds.   Without wave action, the oxygen levels near the surface of the water are often at  and above 100% saturation throughout the day.  Even a tiny amount of mixing energy (less than 50 watts/acre) can redistribute this  supersaturated dissolved oxygen throughout the pond.  This turns your pond into a massive oxygen storage tank,  instead of allowing the excess oxygen to escape or "gas off"  from the pond to the atmosphere.  

That's where free energy and our Solar Powered Aerators come into play!


MIXING WITH DIFFUSED AIR

(the only sure way to under aerate is to turn off the bubbler)

Once you have added enough air bubbles to get the oxygen you need into the pond, you will never need additional energy . The power needed to transfer the oxygen to the water is many times what you need to disperse it completely through any contiguous body of water.  It is a common practice in sewage lagoons and holding ponds to use less than 50 watts per surface acre of solar power to completely mix contiguous bodies of water.

   As long as you do not disturb the bottom sediment,  the deeper you aerate or draw water from the bottom pond layers, the better  the oxygen transfer.  For each 1 foot of  diffuser depth you increase the oxygen transfer by 1-2% while doubling the capital and maintenance costs.  As you try to aerate below 10 feet the technology changes to high pressure, high maintenance, lubricated air compressors which can become a daily maintenance headache.  But there is another way to do it!  You can aerate at any pond depth by partially submerging air diffusers or by floating diffusers inside tubes that reach down  to draw the bottom water up to the top of the pond.  Floating diffusers inside a tube pulls water from the bottom and pushes it out the top of the tube.  This is often refered to as an anchored airlift aerator or draft tube.  Proper sizing using either fixed bottom mounted tubes or floating bottom anchored diffuser tubes reduces costs by sacrificing less than 10% of the oxygen transfer efficiency and eliminating power bills.   Draft tubes are a low cost method of preventing massive fishkills by creating large safe zones of oxygen rich water. 

Non-recreational and sewage lagoon studies using diffused air, mechanical surface aerators, and fountain mixing energy based on shallow 6-20 ft deep  were designed to keep sediment (light solids) in suspension while providing very high levels of oxygen transfer and dispersion throughout these lagoons.  See EPA partial mix lagoon studies.  These studies are excellent for increasing turbidity and treating sewage at 350-1500 watts (0.5-2.0 hp/106 gals.) per million gallons.  DO NOT apply these high levels of horsepower to shallow recreational or aquaculture ponds.

Recreational pond industry specifications to improve water quality equates to 0.01 to 0.25 hp/106 gals. using grid powered diffused aeration to provide very high levels of oxygen transfer and dispersion throughout ponds. 

  Langston University Fish Pond studies show  0.8 cfm of air @ 15 psi., with a DIY system cost of $675-1620,   and  powerbills of  $377-671/yr. for  1 acre fish ponds 3-10ft deep.

Application of these 1 cfm/acre standards using PEC Solar Aeration equipment with add-on airlift tubes and PEC-45/90 diaphragm air pumps is as follows:

Unit Model             hrs/day       * pond depth     #units/acre        fish lbs/unit model max

EKBS-10                                  24              3- 6 ft                       4 -8                       50

EKBS-15                                  24               3-6 ft                       2-4                        100                   

**G2V-STAR                          24              3-20 ft                      1-2                        1000

***Eco-Aerator                       24              3-20 ft                      1-2                        1000

                     

*There is no max depth when using an  airlift aerator  draft tube with any PEC solar aerator.   Simply increase the length of the draft tube to the desired aeration depth.  OTE is based on coarse bubble diffuser @1% foot and depth is calculated at 3-5 feet.  

** Unit to be mounted on flat well drained area above shoreline.  Also known as the EKBSR-1,  shore mounted aerator.

*** Unit includes floatable mount for wet or dry shoreline.
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Why do I have to aerate this year?
Oxygen is required to keep a pond clean and healthy. Under normal conditions you can only get about 8 pounds of oxygen to dissolve in 8 million pounds of water. Not very much!!! Ponds without sustainable aeration systems become stratified and little or no oxygen exists from about 1 inch below the surface to the bottom of the pond. This stratification can result in
hypoxia and massive fish kills when a sudden rainfall mixes the top and bottom water.
Luckily, it takes very little energy to stop stratification in ponds. As little as 0.15 cfm/acre can prevent stratification, immediately improving water quality and preventing massive fish kills. Avoid aeration systems that do not have backup power or have high maintenance. Aeration downtime for any reason encourages stratification and increases the risk of fish kills due to hypoxia.

What type of aeration do I need?
Solar powered air diffuser systems
use less than 10% of the energy of any other type of aeration system for mixing
and are the best way to aerate all ponds. They are the only system that can operate in iced over ponds and freezing conditions and require the least maintenance of any other aeration system. In most diffused air systems a compressor sits on the shore and pumps air into tubing to
the pond where the air escapes out a diffuser. This process puts oxygen directly into the pond and also
creates an uplift effect forcing the water to mix the entire pond with as little as 0.15 cfm/acre. Take care not to place the diffusers so they disturb the bottom pond benthyl layer. Suspended sediment uses more oxygen than any aerator can ever put back into the pond. From a solar powered design standpoint it is more cost effective to suspend the diffusers above the pond bottom. This uses less energy and reduces maintenance.

How often do I need to aerate?
Fish cannot hold their breath any better than you can. Most summer fish kills occur at night or early morning. We recommend running
the aerator 24 hours a day, year around to prevent pond
stratification and summer fish kills.
If you live in an area where ice forms on your pond only diffused air can get oxygen under the ice to stop winter fishkills. 

Most fish kills occur in the early morning!

 PEC Solar Aerators Stop Fish Kills!solaraerator

 

 















 
 



 
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