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Bahia Del Mar Lake Restoration

Vertex aeration eliminates 'rotten egg' odor from high hydrogen sulfide emissions

Bahia Del Mar Before and After

Bahia Del Mar is a 14 acre lake located in St. Petersburg, on the western coast of Florida. In January, 2012, the Home Owners Association contacted Aquatic Systems, Inc. to request assistance in dealing with multiple lake issues including intense odors, ongoing fish kills and algal blooms.

This lake system was severely stratified, with large amounts of organic material in bottom waters, extremely high nutrient levels and high concentrations of hydrogen sulfide causing a “rotten egg” odor, high biological oxygen demand and very low oxygen levels. The system was unsuitable for fish and other aquatic organisms and posed a health risk to residents due to the intense noxious fumes being produced as a result of the hydrogen sulfide emissions from the lake. Due to the extreme conditions of the lake a two-pronged approach was undertaken to bring it back to a healthy state.

  1. Aeration: Bathymetric Mapping provided accurate detail about the depths and volume. Two Vertex systems, an LL 4XL5 Aeration System and a HF 4XL5 Aeration System with sound kits were installed in April, 2012 to provide adequate turnover rates.
  2. Alum application: After extensive laboratory trials to determine the most effective application, Aquatic Systems applied two treatments of Alum at a rate of 60ppm to improve water clarity and reduce water phosphorus levels.

THE RESULTS:

Hydrogen sulfide chart

  • BOD at the bottom of the lake went from 385 mg/L to 2.5 mg/L – a 99% reduction
  • “Rotten Egg” Odor eliminated – Hydrogen sulfide in the water column went from >5 mg/L to 0 mg/L – a 100% reduction
  • Oxygen at bottom of the lake went from 0 mg/L to 8 mg/L
  • Turbidity went from 113 NTU to 8 NTU – a 92% reduction
  • Bottom water Phosphate went from 8137 µg/L to 35 µg/L – a 99% reduction
  • Bottom water Nitrogen Ammonia went from 109,250 µg/L to 800 µg/L – a 99% reduction
  • Algal abundance (Chlorophyll a) went from 87 µg/L to 24 µg/L – a 72% reduction

Download the Lake Restoration Case Study PDF


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Bahia Del Mar Lake