Section 905.120  Disinfection

a)         General.  Surface discharges shall be disinfected with a chlorine solution under the following conditions:

1)         When the effluent is discharged to the ground surface and the effluent leaves the property.

2)         When an individual effluent or the effluent from a common collector is discharged to a pond, lake, or stream in which swimming, water skiing, or other water contact recreation occurs.

b)         Chlorine Feeders.  Chlorination equipment shall have a means of removal of solids.  Appendix A: Illustration S of this Part provides an example of a typical chlorine feeder.  All chlorine feeders shall meet the requirements of Appendix A:  Illustration S of this Part.  Other feeders which meet the requirement of this Section are also acceptable.

c)         Chlorine Contact Tanks.  Chlorine contact tanks shall be baffled and shall provide a contact time of at least 30 minutes based on 2 1/2 times the average flow.  The minimum contact tank capacity shall be 30 gallons.  Access to the distribution feeder shall extend to the ground surface.

d)         Sample Port.  A sampling port at least 4 inches in diameter shall be provided on the effluent line or into the chlorine contact tank, unless a free-fall discharge from the system is easily accessible within 200 feet of the system.

e)         Chlorine Residual.  A final effluent free chlorine residual of 0.2 to 1.5 mg/1 shall be maintained.

f)          Chlorine products used for the disinfection of treated wastewater effluent shall be used according to the product's labeling.

(Source:  Amended at 20 Ill. Reg. 2431, effective March 15, 1996)