Chlorination Equipment

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.