22 Jan 2019
Removal of Nitrogen and Phosphorus from Nursery Runoff using Zeolite and Woodchips
Anna Birnbaum and Jim Owen (Virginia Tech)
Nitrogen (N) and Phosphorus (P) runoff from containerized nurseries contributes impaired US waterways. Virginia Tech aimed to evaluate the effectiveness of ferric aided zeolite sieves with or without bioreactors as a potential BMP for N and P removal of containerized nursery production tail-water (i.e. runoff). The ferric aided zeolite sieve without woodchip bioreactor achieved an average P removal efficiency of 30% with no effect on N removal. Woodchip bioreactors preceding zeolite was effective for N removal with an average rate of 14%. Woodchip bioreactors reduced efficacy at N removal was presumed to be a result of retention times >24hrs and high sulfur concentrations. Ferric aided zeolite+woodchip bioreactor treatment trains may be effective for N and P reduction in nursery tail-water if designed properly to avoid excessive retention times in the denitrification bioreactors.
Watch the presentation here https://youtu.be/7V_H_6orlJc
RemovalNitrogenPhosphorusfromNurseryRunoffusingZeoliteandWoodchips (4957 KB)
16 May 2018
Where Do Nutrients Go When You Irrigate
Fernandez, Thomas R. (Michigan State University)
This article covers irrigation management with an emphasis on nutrient retention. Prevent over-irrigation by understanding how water is held in containers. There are many links provided to assist you in skillful irrigation management.
15 May 2018
Removal of Paclobutrazol from Irrigation Water using Granular Activated Carbon
Grant, G.A., P. Fisher, J.E. Barret, and P.C. Wilson (University of Florida)
Paclobutrazol is a commonly used plant growth regulator for controlling plant height, which has biological activity in the parts per billion range and a half-life in water of over 6 months. Pesticides such as paclobutrazol have potential to accumulate in recaptured irrigation water over time. This recently published article outlines various experiments conducted at the University of Florida where irrigation water containing paclobutrazol was effectively removed using a laboratory-scale granular activated carbon (GAC) filtration system. There is potential that GAC can be used to remediate recaptured irrigation water for a range of agrichemicals relevant to the greenhouse and nursery industry.