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Floating Iris Plants May Help Clean Fishery Wastewater

Date:
February 10, 2009
Source:
USDA/Agricultural Research Service
Summary:
The feasibility of using floating vegetation to remove nutrients from fishery wastewater is being tested by scientists.
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Irises can filter nutrients out of a fishery's wastewater so the water can be returned to ponds for reuse. Of the plant species tested on floating mats in fishery wastewater, iris plants, shown here, grew best.
Credit: Photo by Robert Hubbard

The feasibility of using floating vegetation to remove nutrients from fishery wastewater is being tested by Agricultural Research Service (ARS) scientists.

The researchers' long-term goal is to develop a system to treat the wastewater, return it to ponds for reuse, and use the nutrients to produce biomass or plant material. The floating mats act as filters to remove the nutrients from the water.

The study participants are soil scientist Robert K. Hubbard at the ARS Southeast Watershed Research Laboratory, in Tifton, Ga.; plant geneticist William Anderson and plant pathologist Jeffrey P. Wilson at the ARS Crop Genetics and Breeding Research Unit, both in Tifton; and University of Georgia animal science associate professors Gary Burtle and Larry Newton, also in Tifton.

Wastewater from the fish-production ponds is pumped into 340-gallon aquaculture tanks. Each tank has a 10-foot-square floating mat on which the vegetation grows.

The first objective is to find plant species that grow well in fishery wastewater. Twelve different plant species are currently being tested: St. Augustine grass, Tifton 85 bermudagrass, common bermudagrass, canna lilies, iris, bamboo, bulrush, cattail, bordergrass, napiergrass, reeds, and maidencane. According to Hubbard, the iris is the best performer so far.

The second part of the study--set to begin in the spring of 2009--will determine the effects of the vegetation on water quality and the amount of nutrients removed when plant biomass is harvested.

The plant material will be harvested on an as-needed basis and the plant tissue analyzed for nitrogen, phosphorus, and potassium. Harvested plant material has several potential uses: It can be transplanted, used as feedstock for energy production, or composted and used as a soil amendment.


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The above post is reprinted from materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


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USDA/Agricultural Research Service. "Floating Iris Plants May Help Clean Fishery Wastewater." ScienceDaily. ScienceDaily, 10 February 2009. <www.sciencedaily.com/releases/2009/01/090131124137.htm>.
USDA/Agricultural Research Service. (2009, February 10). Floating Iris Plants May Help Clean Fishery Wastewater. ScienceDaily. Retrieved August 1, 2015 from www.sciencedaily.com/releases/2009/01/090131124137.htm
USDA/Agricultural Research Service. "Floating Iris Plants May Help Clean Fishery Wastewater." ScienceDaily. www.sciencedaily.com/releases/2009/01/090131124137.htm (accessed August 1, 2015).

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