N.J. Admin. Code § 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.
Notes
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