particles & debris (4)

24 Oct 2017

2017 California Nursery Conference: Conclusion

Brett Cregg (Michigan State University), Paul Fisher (University of Florida), Sarah White (Clemson University), Charlie Hall (Texas A&M), and Bruno Pitton, Darren Haver, Grant Johnson, Loren Oki (University of California)

This conference, held on July 27, 2017 in Irvine, CA, focused on Water Management in Nursery and Greenhouse Production. The Clean WateRteam presented their research studies. The conclusion of the conference dealt with recycling water: economics, monitoring quality, managemet of nutrients and agrichemicals, and pathogens and biofilm. The topics covered are:

3-1ImpactsRecycledWateronPlantPhysiologyandgrowth (1175 KB)
3-2BiofilmManagement (3947 KB)
3-3BiologicalTreatmentofRunoff (4394 KB)
3-4SlowSandFilters (2204 KB)
3-5WaterRecyclingEconomics (1245 KB)

21 Mar 2017

The Cost of Filtration

Raudales, R. (University of Connecticut), Fisher, P. (University of Florida), Hall, C.(Texas A&M University)

Filtration is an important step in capture and re-use of irrigation water.  This article presents filtration systems, the initial cost, and the cost to treat 1,000 gallons of water.  Filtration is the first article in the three-part series of water management in GPN magazine. 

The Cost of Filtration (1) can be found in the link below.

6 Feb 2017

Elimination of Tobacco Mosaic Virus From Irrigation Runoff Using Slow Sand Filtration

Oki, L.R., Lee, E., Pitton, B., Nackley, L.,(University of California (UC) Davis), Bodaghi, S., Mathews, D.M. (UC Riverside), Haver, D. (UC South Coast Research and Extension Center)

Slow sand filters have been shown to remove pythiacious organisms from captured runoff water.  In this study, Tobacco Mosaic Virus (TMV) was regularly added to irrigation runoff water.  The virus passed through the sand filters for approximately 5 weeks, but gradually reduced to undetectable virus titer using ELISA during week 6 to 9.  This is the first report that showed slow sand filters removed TMV from runoff water.

1 Jul 2016

Select The Right Filter For Ebb-And-Flood Irrigation

Fisher, P. (University of Florida), Raudales, R. (University of Connecticut), Huang, J. (University of Florida)

Recirculated water from flood floors can contain plant debris, growing media, labels and microorganisms.  This article evaluates the use of vibrating screen and paper/fabric filters for particle removal.  Total suspended solids (TSS) were measured before and after filtration.  Regardless of filter type, approximately 50% TSS was removed.  Two-stage filtration can increase efficacy of particle removal from recirculated water. 

Greenhouse Grower July 2016 (1479 KB)

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Description of research activities

A national team of scientists is working to encourage use of alternative water resources by the nation’s billion-dollar nursery and floriculture industry has been awarded funds for the first year of an $8.7 million, five year US Department of Agriculture – National Institute of Food and Agriculture –Specialty Crop Research Initiative competitive grant.

The team will develop and apply systems-based solutions to assist grower decision making by providing science-based information to increase use of recycled water.  This award from the NIFA’s Specialty Crop Research Initiative is managed by Project Director Sarah White of Clemson University.  She leads a group of 21 scientists from nine U.S. institutions.

Entitled “Clean WateR3 - Reduce, Remediate, Recycle – Enhancing Alternative Water Resources Availability and Use to Increase Profitability in Specialty Crops”, the Clean WateR3 team will assist the grower decision-making process by providing science-based information on nutrient, pathogen, and pesticide fate in recycled water both before and after treatment, average cost and return-on investment of technologies examined, and model-derived, site specific recommendations for water management.  The trans-disciplinary Clean WateR3 team will develop these systems-based solutions by integrating sociological, economic, modeling, and biological data into a user-friendly decision-support system intended to inform and direct our stakeholders’ water management decision-making process.

The Clean WateR3 grant team is working with a stakeholder group of greenhouse and nursery growers throughout the United States.

For example, at the University of Florida graduate student George Grant is collecting data on removal of paclobutrazol, a highly persistent plant growth regulator chemical, from recirculated water using granular activated carbon (GAC) filters. This is being done in both research greenhouses and in a commercial site. The GAC filters can remove more than 90% of chemical residues, and are proving to be a cost-effective treatment method.