N.J. Admin. Code § 7:14A-23.20 - Rotating biological contactors
(a) Rotating
biological contactors (RBC) process may be used when wastewater is amenable to
biological treatment.
(b) RBCs
shall be preceded by properly designed settling facilities. Efficient grease
and scum removal devices shall be provided.
(c) At least four stages shall be provided
for secondary treatment applications. Additional stages may be necessary for
nitrification and additional BOD removal.
(d) Permanent buildings or covers shall be
used to protect the RBC units from sunlight and winter weather. Provisions
shall be made for access to the RBC units for observation and repairs.
Buildings shall have adequate ventilation, heating, and humidity control, and
an internal hoisting device for the removal of the shaft/media assembly. Covers
shall be made in removable sections, or have some other means of allowing
removal and replacement of the shaft/media assembly.
(e) Drive systems shall be variable speed and
may be mechanical or air driven. Air driven systems shall have positive air
flow metering and control to each RBC unit.
1. Bearing units shall be self-aligning and
shall be located outside of media covers to allow easy access for lubrication
and maintenance.
2. A provision for
auxiliary power during power outages is required.
(f) Operation and maintenance requirements,
including biofilm control, drive train and radial support arm maintenance and
repair, and media/shaft repair and replacement, shall be considered in the
design and layout of RBC treatment systems. Provisions shall be made for
positive flow control to each stage, allowing flexibility in feeding and
discharge. Tank depth and configuration shall be such that solids are not
deposited in the tank; also, provisions shall be made for draining the
tank.
(g) To avoid system failure,
flexibility shall be considered in RBC designs. Flexibility can be achieved by
having variable rotational speed, the ability to periodically reverse
rotational direction, supplemental aeration, or the potential for chemical
addition (for example, hydrogen peroxide or chlorine).
(h) Final settling shall provide a detention
time of not less than 90 minutes, with a maximum surface settling rate of 600
gpd/sq. ft. and a weir overflow rate not greater than 5,000 gallons per day per
linear foot. Higher surface settling and weir overflow rates may be used if the
contactor is to be followed by tertiary treatment.
Notes
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