September 2019 - 26

RESEARCH
Commercial installation
of three 264-gallon GAC
filters in series.
CARBON FILTRATION
CLEAN UP YOUR WATER
SPONSORED BY
Is pesticide residue causing issues in your greenhouse crops?
BY PAUL FISHER, GEORGE GRANT AND AND ROSA RAUDALES
A
re pesticide residues in your irrigation water suppressing crop growth
or causing phytotoxicity? Filtration using granular activated carbon
(GAC, Figure 1) in most cases is the best solution to remove pesticides
from water. This article provides guidelines on design and operation of a
GAC filter for greenhouses and nurseries.
Agrichemicals in water can be an issue in several situations. Persistent
chemicals can accumulate in recirculation systems and affect subsequent
crops even in the parts per billion (ppb) range (Figure 2). Growers using
pond water occasionally experience a problem when herbicides are applied
to surrounding land in the water shed and crop growth is
suddenly deformed (Figure 3).
Hydroponic and aquaponic growers may need to remove
chlorine from a municipal water supply to avoid phytotoxicity.
Some growers treat recirculated water with a high dose
of chlorine or another sanitizer for control of resistant
waterborne plant pathogens, such as Fusarium spores,
and need to remove the sanitizer before reusing the water.
Regulations may require remediation of chemicals that have
harmful environmental impacts, such as bifenthrin, before
irrigation runoff leaves a property.
BROAD RANGE OF ACTIVITY
GAC filtration is a simple and cost-effective technology to
remove agrichemicals compared with other options, which
include ozone and ultraviolet radiation. At the University of
Florida, we tested GAC remediation of several chemicals that included
insecticides (acephate, bifenthrin, chlorpyrifos and imidacloprid), herbicides
(glyphosate and triclopyr) and plant growth regulators (flurprimidol,
26 SEPTEMBER 2019 GPNMAG.COM
WITH
Figure 2. 'Super Olympia Red' begonias
after receiving a nutrient solution with either
no paclobutrazol (left) or paclobutrazol at
5 ppb with each irrigation for 23 days.
(Photo: Victor Zayas, University of Florida)
Figure 1. 8x30 US mesh granular
activated carbon.
paclobutrazol and uniconazole) at one tenth of label rates to simulate
diluted levels in nursery runoff. Providing 64 seconds of contact time
under research conditions with fresh GAC filter media removed over
Continued on page 32 ...

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