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pond aeration reduces nutrients
pond aeration helps bacteria

Pond Aeration Controls Nutrients

Winston Park: Nutrient reduction and oxygen transfer efficiency in a South Florida retention pond using artificial destratification aeration

- Amanda Quillen, Ph.D.3-D map

Winston Park is a residential community in subtropical Coconut Creek, Florida. The study lake is a borrow pit and retention pond surrounded by landscaped lawn and partially by single-family homes. Winston Park Lake is 12.7 acres (5 hectares) and has a maximum depth of 32 feet (10 meters) with an average depth of 19.5 feet (6 meters). The lake experienced massive fish kills every fall due to a reduction in oxygen during fall turnover, so Vertex installed an aeration system consisting of six XL5 AirStations© powered by 3 Brookwood© compressors totaling 2.25 hp which produced 14 CFM of air at 19 PSI. This system is sized to turn the water over in the lake at a rate of 0.8 turnovers per day. In February of 2009 the system was turned off.

THE RESULTS

Winston Park charts

  • Orthophosphate levels were reduced 97%
  • Ammonia levels were reduced 55%
  • Biological oxygen demand (BOD) declined 60%

Oxygen transfer:
Stratification was most enhanced at the beginning of and during the startup period rather than at the beginning of the sampling period due to hot weather between the June 3 and June 15 sampling dates. Rainy, cloudy, stormy weather leading up to the end of the startup period likely led to more rapid destratification of both temperature and oxygen profiles than may have occurred with aeration alone.

Download the Nutrient Reduction Case Study PDF