Navigation Links
Canna can: Ornamental eliminates pollutants from stormwater runoff
Date:12/10/2009

HAMMOND, LA Rapid population growth and urbanization have raised concerns over stormwater runoff contamination. Studies on watersheds indicate that excess nutrients, specifically nitratenitrogen and soluble reactive phosphorus are found in stormwater runoff in many new urban areas. These pollutants degrade water quality and have an impact on the downstream ecosystem by contributing to the growth and decomposition of oxygen-depleting microorganisms.

A research team recently used a nutrient recirculation system (NRS) to assess the ability of four ornamental and three wetland plant species to remove nitrogen and phosphorous from stormwater runoff. The study showed that canna is a promising ornamental species for stormwater mitigation, and harvesting the aboveground biomass of canna can effectively remove nitrogen and phosphorous from the treatment system.

A variety of stormwater treatment technologies such as constructed wetlands and retention ponds have been developed in response to increasing regulatory pressures, but water quality issues are still found in many stormwater treatment structures. To meet increasingly rigorous EPA regulations, significant nitrogen and phosphorous reductions are necessary to improve water quality before it is discharged into the ecosystem from stormwater retention structures.

A relatively new technique using floating wetlands (also called "floating islands") for stormwater improvement has been tested in a wastewater treatment pond and a laboratory-scale constructed wetland; the results have suggested that the use of floating systems can increase mitigation capacity and provide efficient nitrogen and phosphorous removal in small treatment structures in urban areas. When ornamental plants are added to floating wetland systems, the benefits can be both aesthetic and environmental.

In a study published in a recent issue of the journal HortScience, a research team headed by Yan Chen of Louisiana State University's Hammond Research Station, analyzed the nutrient removal abilities of herbaceous perennial ornamentals (canna, iris, calla lily, and dwarf papyrus) compared with those of wetland plants (arrow arum, pickerelweed, and bulltongue arrowhead) in three experiments. The nutrient recirculation system (NRS) was filled with a nutrient solution with total nitrogen (N) and phosphorous (P) concentrations of 11.3 and 3.1 mg/liter, respectively, to simulate high levels of nutrient contaminations in stormwater.

The results showed that 'Australia' canna had the greatest water consumption, total biomass production, and aboveground nitrogen and phosphorous content, followed by pickerelweed. 'Golden Fleece' iris had higher tissue nitrogen concentrations than canna, but much lower biomass production. Dwarf papyrus had similar total biomass as pickerelweed, but less shoot biomass. Nitrogen and phosphorous removed from the NRS units planted with canna (98.7% N and 91.8% P) were higher than those planted with iris and arrow arum (31.6% and 31.5% N, and 38.5% and 26.3% P, respectively). NRS units planted with dwarf papyrus had similar nutrient recovery rate as pickerelweed, but much less total N and P were removed as a result of less water consumption. The NRS units planted with calla lily had lower nutrient removal than canna and pickerelweed.

Results from the study suggest that ornamental canna has the potential to be used as mitigation plants in urban stormwater floating biofiltration treatment. Because canna is a perennial plant and allocates the majority of its biomass to shoots, it can be harvested regularly, offering consistent removal of biomass from the treatment system. Chen noted that more research needs to be done to evaluate factors that might affect its application, such as "nitrogen and phosphorous loading and hydraulic conditions, planting densities, poly culture, harvesting frequency, and growth maintenance techniques."


'/>"/>

Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert  

Related biology news :

1. Weeding out marijuana: Researchers close in on engineering recognizable, drug-free Cannabis plant
2. Daily consumption of cannabis predisposes to the appearance of psychosis and schizophrenia
3. The bodys own cannabis (marijuana) is good for the skin
4. Medicines derived from cannabis: a review of adverse events
5. The endocannabinoids: Functional roles and therapeutic opportunities
6. Mustard seed meal suppresses weeds in container-grown ornamentals
7. New technique eliminates toxic drugs in islet transplant in diabetic mice
8. Yamanaka eliminates viral vector in stem cell reprogramming
9. Exposure to both traffic, indoor pollutants puts some kids at higher risk for asthma later
10. Air pollutants from abroad a growing concern, says new report
11. This idea doesnt stink: New tech cuts industrial odors, pollutants
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Canna can: Ornamental eliminates pollutants from stormwater runoff
(Date:7/20/2017)... Delta (NYSE: DAL ) customers now can use fingerprints instead ... National Airport (DCA). ... Delta launches biometrics to board aircraft at Reagan Washington National Airport ... Delta,s biometric boarding pass experience that launched in ... the boarding process to allow eligible Delta SkyMiles Members who are enrolled ...
(Date:5/23/2017)... , May 23, 2017  Hunova, the first robotic gym for the ... been officially launched in Genoa, Italy . The first ... and the USA . The technology was developed ... market by the IIT spin-off Movendo Technology thanks to a 10 million ... News Release, please click: ...
(Date:4/24/2017)... -- Janice Kephart , former 9/11 Commission ... LLP (IdSP) , today issues the following statement: ... 6, 2017 Executive Order: Protecting the Nation ... instilled with greater confidence, enabling the reactivation of ... are suspended by until at least July 2017). ...
Breaking Biology News(10 mins):
(Date:9/19/2017)... ... September 19, 2017 , ... A best-selling author and an ... “Grit” author Angela Duckworth and her team at Character Lab have joined Philadelphia’s ... international law firm with decades of experience supporting high-growth companies in the technology ...
(Date:9/19/2017)... ... September 19, 2017 , ... ... outbreak is about to be eliminated, said Lyle Probst, President, CEO and Founder ... technologies different than other pathogen detection solutions, Probst said, “Sample preparation takes ...
(Date:9/19/2017)... ... September 19, 2017 , ... Molecular Devices, ... with Cytena GmbH to launch the CloneSelect™ Single-Cell Printer™ in North America. ... single cells and provide visual documentation of monoclonality for use in cell line ...
(Date:9/18/2017)... , ... September 18, 2017 , ... ... residues to produce biochar, briquettes, and torrefied wood is the topic of a ... , To characterize the potential economic viability of transportable biomass conversion facilities for ...
Breaking Biology Technology: