About BioHaven® FTW Technology: Floating Treatment Wetlands
BioHaven® Floating Treatment Wetlands .... Cleaning Water Nature's Way
Modeled after native wetlands, BioHaven® Floating Islands are a concentrated form of one of nature’s water purification systems. Made from a proprietary matrix of 100% recycled plastic, injected with inert polyurethane foam for buoyancy, they are designed to support vegetation above the waterline and beneficial microbial habitat below.
Both types of BioHaven® – Floating Treatment Wetlands and Living Walkways, larger custom-designed islands designed to support walkways, docks, picnic tables and other structures – provide a number of benefits. Among other things they:
• are beautiful – each one a unique natural garden
• add critical riparian habitat for fish and birds
• are virtually self-sustaining and maintenance free
• remove and reduce nitrogen, phosphorus, organic waste plus heavy metals and pharmaceuticals.
• reduce erosion damage to surrounding natural shoreline.
BioHaven® Islands mimic nature with a floating wetland that hydroponically draws nutrient out of the water through the proliferation of microbial bio-film and plants.
Research: Key findings by Floating Island International
Summary of key findings for waste water treatment, MBRCT study:
* Remove TSS to below detection limits (<10 mg/L)
* Reduce DOC at a rate of 9000 mg/(ft2*day)
* Reduce Phosphorus at a rate of 428 mg/(ft2*day)
* Nitrify Ammonia at a rate of 750 mg/(ft2*day)
* Simultaneously denitrify nitrate to nitrogen gas
See the article about this research paper:
Floating Island as an alternative to constructed wetlands
Summary of key findings for storm water treatment, NIWA study:
* Matrix with plants more effective than matrix alone for copper, suspended sediment and nutrient removal.
Approximate results for planted islands treating synthetic urban stormwater:
* 50-65% removal of total copper after 7 days, 70-85% in 14 days
* 5-30% removal of zinc in 7 days, 30-45% in 14 days
* 50-67% reduction in turbidity in 7 days and down to < 1 NTU after 14 days
* Ammonium-nitrogen (NH4-N) reduced by 50-90 % in 3 days and 65-95% after 7 days
* Dissolved Reactive Phosphorus (DRP) reduced up to 20-50% after 7 days, 50-85% after 14 days.
Note: In the conclusions section of the Tanner/Headley report, they list the range (in metric units) of removal as:
Copper: 3.8 – 6.4 mg/square meter /day
Zinc: 25 – 88 mg/square meter /day.
Converting to our standard Floating Island U.S. units yields:
Copper: 0.4 – 0 .6 mg/sf/day
Zinc: 2.3 – 8.2 mg/sf/day
See a summary article and a detailed report about this research:
NIWA Storm Water Article
TR2008 NIWA Removal of Copper, Zinc and Fines
Here is a general review of floating treatment wetland from an independent study in New Zealand:
TP324 Floating Wetland Review-Final