Biohavens – the only truly bio-mimicking floating wetland – Case Study #18 – eutrophication

12 November 2015

BioHaven® FTWs Remove Nutrient Loads from Eutrophied Lake

Project Location: Yingri Lake, Jinan, China

At an urban lake in China, large reductions in chemical oxygen demand (COD), biochemical oxygen demand (BOD), total nitrogen and total phosphorus were measured within three months after BioHaven® floating treatment wetland (FTW) installation, which met the project objectives. The primary goal of reducing algae blooms was also achieved.

Overview

The purpose of this floating island application was to prevent summer algae blooms by reducing the nutrient load in an urban lake. Reductions in nutrient levels were anticipated to increase the overall health of the lake by decreasing algae growth, increasing dissolved oxygen levels and decreasing odors. The location is Yingri Lake at Quancheng Park in Jinan, a city of seven million people in North China near the east coast.

Screen Shot 2015-11-11 at 14.24.50

Screen Shot 2015-11-11 at 14.24.58

Yingri Lake had typically experienced a severe algae bloom every spring; however, no algae bloom was seen in 2010 after the FTW installation in April.

Conclusions

  •   Large reductions in COD, BOD, total nitrogen and total phosphorus were measured within three months after FTW installation, which met the project objectives.
  •   The islands are aesthetically pleasing.
  •   It is unclear why dissolved oxygen concentrations decreased; however, the primary related goal of reducing algae blooms appears to have been achieved.

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