US Army Corp, Las Cruces Kansas City Power & Light
Manage Stormwater Ponds with Solar Powered Aeration
Stormwater Pond Design?
Stormwater detention ponds are designed for sedimentation (settling of small and large solids for removal). Supplemental stormwater aeration designs should not exceed industry specifications for aerating recreational ponds to improve water quality and reduce algae which equate to 0.01 to 0.25 hp/106 gals to minimize any suspension of these settled solids. Stormwater basins can easily maintain dissolved oxygen levels at these power levels to promote aerobic high life, prevent stagnant disease causing conditions, abate mosquito growth, control odor, and reduce nutrient levels in a body of water.
How large does the solar powered aeration system need to be?
Solar powered aerators perform exactly like grid powered aerators. However, they do use a green, renewable energy source, the sun! A general rule
is that one diffuser unit can circulate a one to two acre pond, but
sizing diffuser systems has a lot to do with surface area, depth, and
the shape of the pond. Fine bubble diffusers can oxygenate and quickly raise the dissolved oxygen levels throughout the surface of a body of water creating an odor cap in shallow ponds. Because the bubbles in shallow water travel a shorter distance and create less current, more settling can occur while 3-5 foot depth surface oxygen levels remain high. Ponds with odd shapes,
bottlenecks, and narrow canals may need addtional diffusers if it is desired to
circulate highly oxygenated water to the deeper sections of the pond. Care must be taken to limit deep water diffuser mixing in secondary or fines settling ponds and kept totally away from the center of combined settling ponds where fine settled materials or muck could be resuspended. Instead, strategically place diffusers centered in tertiary pond areas or nearer to the discharge or effluent in combined settling ponds. Placement of diffusers centered near the well-mixed influent flow areas in all pond designs can also insure efficient oxygen transfer without affecting solids suspension adversely.
Stormwater G2V-STAR-120 units ($2819) provide a single gentle circulation diffuser array as specified below. Multiple diffuser requirements and future system upgrades can be easily met by adding more units at anytime. Multiple float mounted G2V-STAR-120 units ($785 add-on) can be located anywhere in or around a body of water with minimal site preparation. Single or multiple fixed shoreline mount units can be placed side-by-side within 300 feet of 6-10 foot deep pond.
Studies from Clemson University Stormwater Pond Management support an air flow of 1 cubic foot per minute of air (cfm) from a single fine bubble aeration diffuser can adequately circulate and aerate a 1-2 acre stormwater retention pond.
Thats exactly what our fixed G2V-STAR-120L and floatingG2V-STAR-120F units produce using only the sun! Solar Powered Aerators using 1 cfm, 12" EPDM self-cleaning, fine bubble tube membrane diffusers go anywhere and can be setup by anyone who can open the box in minutes! Every G2V-STAR-120 series model produces a minimum of 1 cfm/acre, 24/7, for Stormwater and Emergency Overflow Ponds using bottom mounted or anchored floating diffusers. Push a switch and you can double that air flow to 2 cfm for 20 hours each day.
Circulating and aerating water in stormwater ponds provides several benefits. A properly designed circulation system can prevent stratification, odor, and turnover fish-kill events. Circulation systems also manage nutrients in the pond by balancing the trophic state and reducing nutrients.
By far, diffuser systems circulate water most efficiently and our 100% solar powered units never have a power bill. A general rule is that one diffuser unit can circulate a one to two acre pond. Small or shallow ponds, 3-5 ft deep, typically require fewer diffusers as mixing and oxygen transfer by wind action alone disperses oxygen throughout the pond as is the design most municipal water treatment lagoons. More diffusers may be needed in large irregularly shaped ponds for mixing deep water between pinch points.
POST AERATION INCREASES THE DISSOLVED OXYGEN TO REDUCE THE LOAD DOWNSTREAM.
Our EcoAerator (G2V-STAR-120F)is also utilized to immediately improve pond effluent or overflow dissolved oxygen levels.
Stormwater and Wastewater lagoon effluent oxygen demands should be measured, but if they cannot be easily measured, an oxygen uptake rate of 0.1 lbs O2 /hour/ 1000 gallons can be used. Our 1-4 cfm of fine bubble EcoAerators can easily handle wastewater oxygen uptake rates of 0.8/ lbs O2/hour/ 1000 gallons or +4 times the recommended typical wastewater pond effluent application rate needed to reach 50-100% of saturation with 30-60 minutes of detention time.
Algae control and mosquito abatement in man made and natural ponds has been studied worldwide. Most recently studies have focused on stormwater and coal-ash retention pondsas a direct function of aeration intensity to stabilize dissolved oxygen levels, prevent mosquito breeding, control algae sporulation, and prevent anaerobic odors. PEC recommends a minimum of one G2V-STAR or floating Eco-Aerator version of our solar aerator per surface acre for dissolved oxygen control. Our floating airlift aerator draft tube draws water from any depth adds oxygen and mixing inside an expandable 4" diameter tube. This prevents disturbing any bottom sediment or clay layers.
Algae-out with "Fish-grow" are algae enzymes that work with aeration to improve water quality and reduce algae buildup.
*There is no max depth when using a PEC airlift aerator, because it is a floating tube. Simply increase the length of the draft tube to vacuum water from any desired aeration depth up to 20 feet deep. The draft tube standard discharge flow is omnidirectional
**The standard Eco-Aerator mounts wet or dry and is designed for stormwater, effluent retention ponds, and dugouts.