Section 604.705  Chlorination Equipment

a)         Procedure for Submitting Plans and Specifications − Design documents for chlorination must be prepared and submitted in accordance with 35 Ill. Adm. Code 602.

b)         Chlorination equipment must:

1)         be large enough to satisfy the immediate chlorine demand and give a measurable residual of at least 2.0 mg/L of total chlorine under all operating conditions after contact;

2)         be capable of feeding chlorine to the water being treated at a dosage rate of at least 5.0 mg/L, except when the water has a high chlorine demand.  Factors in determining chlorine demand are:

A)        pH;

B)        water temperature;

C)        contact time;

D)        presence in the water of substances having chlorine demand such as hydrogen sulfide, iron, manganese and nitrogenous compounds including ammonia; and

E)        supplemental treatment such as aeration that reduces chlorine demand;

3)         be provided in duplicate when operating conditions do not allow repair of the chlorinator during off-pumping periods;

4)         be provided in duplicate, installed and operational, at community water supplies treating surface water, groundwater under the direct influence of surface water, and groundwater with a history of total coliform positive results; and

5)         include spare parts for emergency repairs consisting of at least the commonly expendable parts such as glassware, fittings, hose clamps, and gaskets.