Group Title: Lake Alfred AREC reseach report - University of Florida Agricultural Research and Education Center ; CS-79-3
Title: A key for determining the use of sodium hypochlorite (liquid cholorine) to inhibit iron and slime clogging of low pressure irrigation systems in Florida
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Permanent Link: http://ufdc.ufl.edu/UF00072463/00001
 Material Information
Title: A key for determining the use of sodium hypochlorite (liquid cholorine) to inhibit iron and slime clogging of low pressure irrigation systems in Florida
Series Title: Lake Alfred AREC reseach report
Physical Description: 5 p. : ; 28 cm.
Language: English
Creator: Ford, Harry W., 1922-
Agricultural Research and Education Center (Lake Alfred, Fla.)
Publisher: University of Florida, IFAS, Agricultural Research and Education Center
Place of Publication: Lake Alfred FL
Publication Date: 1979
 Subjects
Subject: Irrigation -- Equipment and supplies -- Maintenance and repair -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Harry W. Ford.
General Note: Caption title.
General Note: "5/17/79-HWF-100."
 Record Information
Bibliographic ID: UF00072463
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 76805161

Full Text
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Lake Alfred AREC Research Report-CS79-3
F6 5/17/79-HWF-100


A Key for Determining the Use of Sodium Hypochlorite (Liquid Chlorine) to Inhibit
Iron and Slime Clogging of Low Pressure Irrigation Systems in Florida

Harry W. Ford
Professor (Horticulturist) r---. ....
Agricultural Research and Education Cint i, i i/ :I
Lake Alfred, Florida 33850 A I

JUL 20 1979
Terminology .
.TermilS..-Uiv. of Florida
EPA approved treatment. Only liquid sodium hypochlorite (Na0O-I-Ts-approved-forJ use
in irrigation systems in Florida.

D.P.D. type chlorine test kit. A required purchase to measure free residual chlorine.
DO NOT use an orthotolodene swimming pool test kit which measures only total chlorine.

Free residual chlorine. The excess chlorine available to kill bacteria. Excess
chlorine cannot be present until chemical reactions with chlorine have been satisfied.

Injection system. A good quality variable rate injection pump is suggested. Increase
the rate of injection until the correct chlorine free residual is obtained.


Injection time. A 40 minute minimum injection of NaOC1 should occur early enough in
the irrigation cycle to permit 30 minutes of chlorine to reach the last emitter.

NaOC1. SEE: Sodium hypochlorite

ium hypochlorite (NaOCI). Liquid bleach or swimming pool chlorine either as
.25% or 10%.

Water quality measurements are essential in order to use this key. Throughout the
irrigation season, changes in water quality will occur for iron, sulfides, and pH.
These should be checked at intervals and appropriate modifications made in the chlorine
injection procedure.

Water holding tanks with air spaces should not be used on low pressure systems. They
serve as chambers for bacterial slime growth particularly sulfur slime. The frequency
of chlorination must be increased. Certain precipitation reactions associated with
holding tanks have not been controlled in the range of pH 6.5-7.5.





-3-


Turbine pump.
Turbine pump.


NaOC1 injected below turbine
NaOC1 injected just after pump on pressure side.


13. Water contains less than 3.5 ppm iron
13. Water contains more than 3.5 ppm iron. Unsatisfactory
No pressure holding tank on line
Pressure holding tank with air chamber. Unsatisfactory
15. If well is contaminated with iron deposits and iron
concentration is less than 2 ppm
15. If iron is more than 2 ppm. Unsatisfactory
Water almost free of suspended solids and/or organic-iron
completing agents.
Water contains suspended solids and organic-iron completing
agents. Less than 1 ppm iron. May clog from suspended
sludge particularly if iron is more than 1 ppm. Otherwise
17. Open well with centrifugal pump. Submerged pumps with
deep injection for NaOC1. Iron less than 2 ppm. More
than 2 ppm is Unsatisfactory
17. Turbine pump. Surface injection for NaOC1. No holding
tank. Iron less than 1.0 ppm. More than 1 ppm is
Unsatisfactory
17. Turbine pump. Deep injection for NaOC1. No holding
tank. Iron less than 2 ppm. More than 2 ppm is
Unsatisfactory

Open well with centrifugal pumps and submerged pumps with
deep NaOC1 injection. Iron less than 2 ppm. Note: System
will clog in 24 hours if chlorination stops. Otherwise
Turbine pump. As deep NaOC1 injection as possible. Iron
less than 2 ppm. System will clog in 24 hours if chlorination
stops. Otherwise
19. Water almost free of suspended solids and/or organic
discoloration
19. Water contains suspended solids and/or discoloration
Open wells and/or other means of well contamination
No well contamination. MAY NOT NEED CHLORINATION. Otherwise
21. Sulfides less than 4 ppm
21. Sulfides more than 4 ppm may be toxic to plant roots
Artesian well
Well is not artesian
23. No leaks in well casing or other points on vacuum
side. Check valve. Positive artesian pressure during
irrigation season.
23. Any one of the following: Possible leaks in well casing
or other points on vacuum side. Old gate valve on
vacuum side. Pressure holding tank near pump. Artesian
pressure may be negative during dry season.


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No leaks of air on vacuum side of pump go to I
Possible leaks on vacuum side of pump. Pressure holding
tank in system. No check valve. Artesian pressure negative
during dry season. go to J
25. Sulfides 0.5 to 2 ppm and iron 0.1 to 3.0 ppm
25. Sulfides 2 to 4 ppm and iron less than 0.6 ppm
25. Sulfides 2 to 4 ppm and iron more than 0.6 ppm. Unsatisfactory
except with more than .12 gph microsprinklers. Otherwise


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pH up to 7.5 use Na0C1 with minimum of 0.75 ppm (Mg/L) free residual chlorine as
measured at the end of line (2.5 ppm free residual near pump).
Inject for a minimum of 40 minutes each 25 to 40 hours accumulative time.
Watch carefully for any sulfur slime formation in the area of the last emitter
in the system.

pH 7.5-8.0 increase treatment by 1 ppm of NaOC1.

pH up to 7.5 use NaOC1 with minimum of 0.75 ppm (Mg/L) free residual chlorine
as measured at end of line (2.5 ppm free residual near pump).
Inject for a minimum of 40 minutes each 10 hours of accumulative time.
Watch carefully for any sulfur slime formation in the area of the last emitter
in the system.
pH 7.5-8.0 increase treatment by 1 ppm.of NaOC1.
pH up to 7.5 use NaOC1 with minimum of 0.75 ppm (Mg/L) free residual chlorine
as measured at end of line (2.5 ppm free residual near pump).
Inject for a minimum of 40 minutes each 10-20 hours accumulative time.
Watch carefully for any sulfur slime formation in the area of the last emitter
in the system.
pH 7.5-8.0 increase treatment by 1 ppm of NaOC1.

pH up to 7.5 use NaOCl with minimum of 0.75 ppm (Mg/L) free residual chlorine
as measured at end of line (2.5 ppm free residual near pump).
Inject for a minimum of 40 minutes each 6-8 hours accumulative time.
Watch carefully for any sulfur slime formation in the area of the last emitter
in the system.
pH 7.5-8.0 increase treatment by 1 ppm of NaOC1.




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