September 2019 - 32

RESEARCH
Figure 3. Herbicide damage on New Guinea impatiens after irrigating
with contaminated pond water.
Figure 4. Polyester bag pre-filter to remove particles before the GAC filtration.
... continued from page 26
90% in all cases except bifenthrin (72%) and imidacloprid (85%).
These results lend confidence in using GAC to remove a wide range of
pesticides, although a longer 15-minute contact time is recommended in
commercial conditions.
GAC filters were also very effective at removing sanitizers (quaternary
ammonium chloride at 7-ppm active ingredient, sodium hypochlorite at
2-ppm free and total chlorine, and a combination of hydrogen peroxide +
peracetic acid at 58 ppm and 4 ppm). Levels were non-detectable with
64 seconds of contact time. These results indicate GAC is effective at
removing a sanitizer after treatment in recirculated water.
A GROWER CASE STUDY
A grower in northeastern U.S. generously shared information about
their installation of GAC. In this case study, the grower collected and
re-used irrigation drain water from 20 acres of subirrigated greenhouse
production space, resulting in approximately 1,450,622 gallons of recycled
irrigation water filtered annually by GAC. The treatment goal was to remove
paclobutrazol to below 5 ppb.
The larger the flow rate, the bigger (and more expensive) the filter. In the
case study operation, return water from the ebb-and-flood system first went
into a holding tank. It was then pumped at a slow flow rate (50 gallons/minute)
through three 264-gallon (1,000 pound) GAC vessels in series before being
recycled for irrigation. To calculate the required filter volume for a 15-minute
contact time, multiply the flow rate (in this case, 50 gallons/minute) x 15
minutes = 750 gallon volume. By running the filter for several hours per day at
a low flow rate, cost was reduced in the case study operation.
Ensuring there is adequate pre-filtration is important. First, use a coarsescreen,
sand, or paper filter to remove large particles from return water. At
the case study location, irrigation solution passed through a series of 50- and
5-micron polyester bag filters (Figure 4) before receiving GAC filtration. GAC
My Passion. My Journey.
MY RIMOL
GREENHOUSE
Troy Miller, Troy's Landscape Supply
Over the past 26 years, Troy Miller has
watched his business grow into an iconic
landmark with a solid reputation as far as
50 miles in every direction. Troy's 12 bay
Matterhorn greenhouse, along with his freestanding
greenhouses and shade structures
are the foundation of his thriving, NY-based
landscaping supply and garden center.
READ MORE ABOUT TROY'S STORY AT
RIMOL.COM/TROYS
Matterhorn Greenhouse

http://www.RIMOL.COM/TROYS

September 2019

Table of Contents for the Digital Edition of September 2019

September 2019 - 1
September 2019 - 2
September 2019 - 3
September 2019 - 4
September 2019 - 5
September 2019 - 6
September 2019 - 7
September 2019 - 8
September 2019 - 9
September 2019 - 10
September 2019 - 11
September 2019 - 12
September 2019 - 13
September 2019 - 14
September 2019 - 15
September 2019 - 16
September 2019 - 17
September 2019 - 18
September 2019 - 19
September 2019 - 20
September 2019 - 21
September 2019 - 22
September 2019 - 23
September 2019 - 24
September 2019 - 25
September 2019 - 26
September 2019 - 27
September 2019 - 28
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September 2019 - 30
September 2019 - 31
September 2019 - 32
September 2019 - 33
September 2019 - 34
September 2019 - 35
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September 2019 - 38
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September 2019 - 40
September 2019 - 41
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September 2019 - 45
September 2019 - 46
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September 2019 - 50
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September 2019 - 60
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https://www.nxtbook.com/greatamericanmediaservices/GPN/2024-guide-to-cannabis-production
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-december-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/new-varieties-digital-guide-2024
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2023
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https://www.nxtbook.com/greatamericanmediaservices/GPN/2023-guide-to-hemp-production
https://www.nxtbook.com/greatamericanmediaservices/GPN/march-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/february-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/2023-guide-to-cannabis-production
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-december-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-october-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/gpn-new-varieties-digital-guide-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2022
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https://www.nxtbook.com/greatamericanmediaservices/GPN/march-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/february-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/hempguide-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/newvarieties-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-november-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2021
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https://www.nxtbook.com/greatamericanmediaservices/GPN/february-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/hempguide-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/newvarieties-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-november-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-september-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/july-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/californiaspringtrials-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/march-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/february-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/hempguide-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2019
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