N.J. Admin. Code § 7:14A-23.23

Current through Register Vol. 56, No. 21, November 4, 2024

Section 7:14A-23.23 - Chlorination

(a) Chlorination devices shall be of the solution feed type, installed in duplicate or with duplicate essential parts. Chlorinators shall be of an automatic feed type for sewage treatment plants with a design capacity of greater than 150,000 gallons per day.

(b) Chlorinating devices shall be designed in accordance with the following:

1. The devices shall be placed in separate rooms with an outside entrance only and shall be provided with adequate ventilation.

2. Rooms containing chlorinating devices shall have doors that open outward.

3. Provisions for heating during the winter season are required.

4. Suitable gas masks shall be provided and maintained in good operating condition, and shall be stored in an accessible location outside the chlorine room.

5. An automatic alarm and observation window to permit visual inspection without opening the door, should be provided.

(c) For reduction in fecal coliform, a chlorine contact period of at least 30 minutes, based upon design flow, shall be provided in a separate baffled tank, and a contact period of not less than 20 minutes shall be provided during peak hourly flow. For reduction of enterococci or other pathogenic indicators increased contact periods and/or application rates may be required.

(d) Provisions shall be made for the thorough mixing of the disinfectant and the sewage before discharge to the chlorine contact tank.

(e) Scales shall be provided for determining chlorine consumed, and a suitable means for measuring residual shall also be provided.

(f) If hypochlorite feeders are provided, duplicate solution tanks each having at least 36 hours storage capacity are recommended.

(g) Automatic chlorinators with residual recorders and alarm systems to indicate chlorinator failures are required.

(h) Capacity of chlorinators shall be in conformance with the following:

1. For disinfection, the capacity of chlorinators shall be adequate to produce a concentration of residual chlorine in the effluent so as to dependably and consistently reduce the fecal coliform concentration to that specified in the applicable discharge permit. For normal domestic sewage the following minimum dosing capacities are required:

Type of Treatment	Dosage (Based on
	Average Design Flow)
Raw Sewage	30 ppm
Primary Sedimentation Effluent	20 ppm
Trickling Filter Plant Effluent	15 ppm
Activated Sludge Plant Effluent	10 ppm
Sand Filter Effluent	10 ppm

2. For reduction of enterococci or other pathogenic indicators increased contact periods and/or application rates may be required.

N.J. Admin. Code § 7:14A-23.23