CLOGGING AND MAINTENANCE OF MICRO IRRIGATION SYSTEMS - Management, Performance, and Applications of Micro Irrigation Systems - page 93

If emitters are already partially plugged by organic matter, “super-chlorination”
treatment is warranted; it involves maintaining a concentration of 200 to 500 ppm
chlorine in the system for 24 h.
Some extra chlorine should be injected to account for the tied up chlorine.

7.2.4.2 INJECTION RATE FOR CHLORINE
The equations to calculate the injection rate (English and metric units) are shown in
Table 2. The percentage of chlorine for different compounds and a numerical example
are also presented in Table 2. The necessary injection rate in gallons per hour of chlo-
rine is shown in Table 3.

TABLE 2 Formulas to calculate the injection rate for chlorination.

English Units Calculation Metric Units Calculation

0 006 . C 006 . xFxC

IR = IR =

(2) (3)

P P

where:
IR = Injection rate, liters/hr.
F = Flow rate of the system (LPS)
C = Concentration of chlorine wanted,
ppm
P = Percentage of chlorine in the solu-
tion*
*The percentage of chlorine for different compounds is as follows:
calcium hypochlorite—65%
sodium hypochlorite (household bleach)—5.25%
lithium hypochlorite—36%
Numerical example:
A farmer wants to inject chlorine into his system at a concentration of 5 ppm in a system with
a flow rate of 100 GPM. He is injecting household bleach that has a chlorine concentration
of 5.25%.
0 006

where:
IR = Injection rate, GPH
F = Flow rate of the system (GPM)
C =Concentration of chlorine wanted, ppm
P = Percentage of chlorine in the solution*

. C 0.006 100 5 xx

IR = = = 0.571 GPH

P 5.25

Of sodium hypochlorite (household bleach)