New Jersey Administrative Code › Title 7 - ENVIRONMENTAL PROTECTION › Chapter 9A - STANDARDS FOR INDIVIDUAL SUBSURFACE SEWAGE DISPOSAL SYSTEMS › Subchapter 8 - PRETREATMENT COMPONENTS › Section 7:9A-8.1 - Grease removal and high strength wastewater pretreatment components

Current through Register Vol. 56, No. 14, July 15, 2024
(a) Restaurants,
				cafeterias, institutional kitchens and other facilities discharging large
				quantities of grease shall use a grease trap and a high strength wastewater
				pretreatment component. A garbage grinder shall not be used when grease removal
				components are required.
(b) The
				grease trap shall be installed in a separate line serving that part of the
				plumbing system into which the grease will be discharged. The grease trap shall
				be located close to the source of the wastewater, where the wastewater is still
				hot, to facilitate separation. Grease traps shall be located, designed and
				constructed in a manner that will permit easy access and cleaning.
(c) The following equation shall be used to
				determine the minimum size required for grease traps serving restaurants: Q =
				(D) x (HR/2) x (12.5) x (LF), where
Q = size of grease trap in gallons;
D = number of seats in dining area;
HR = number of hours open per day; and
LF = loading factor depending on restaurant location:
1.25 for interstate freeways;
1.0 for other freeways;
1.0 for recreation areas;
0.8 for main highways;
0.5 for other highways.
(d) The following equation shall be used to
				determine the minimum size required for grease traps serving cafeterias and
				institutional kitchens: Q = (M) x (11.25) x (LF), where:
Q = size of grease trap, gallons;
M = total number of meals served per day; and
LF = loading factor depending on type of facilities
				  present:
1.0 with dishwashing;
0.5 without dishwashing.
(e) In no case shall a grease trap serving a
				restaurant, cafeteria or institutional kitchen be smaller than 750 gallons in
				capacity.
(f) The minimum
				requirements for construction, materials and foundations of grease traps shall
				be the same as those required for septic tanks, as prescribed in
				7:9A-8.2.
(g) The inlet and outlet of the grease trap
				shall be provided with "T" baffles extending to a depth of 12 inches above the
				tank floor and well above the liquid level.
(h) To facilitate maintenance, manholes
				extending to finished grade shall be provided. Covers shall be of gas-tight
				construction and shall be designed to withstand expected loads and prevent
				access by children.
(i) High
				strength wastewater pretreatment components shall be approved by the
				administrative authority only if the components are designed, constructed and
				certified by a septic system designer to actively treat and therefore reduce
				fats, oils and grease, total suspended solids, biochemical oxygen demand and
				chemical oxygen demand. The components shall be designed to meet the following
				effluent criteria:
Constituent
Concentration
						  (mg/L)
Total suspended solids (TSS)
155
Five-day biochemical oxygen demand
						  (BOD[5])
155
Fats, oils and grease (FOG)
70
Chemical oxygen demand (COD)
500
(j)
				The septic system designer certification of the high strength wastewater
				pretreatment components must specify how the grease removal components are to
				be installed and maintained to achieve the identified effluent design
				criteria.
(k) Grease removal
				components must be equipped with audio and visual alarms to identify when the
				storage capacity of the system has reached 75 percent. When the storage
				capacity reaches 75 percent, the operator of the system shall take immediate
				steps to maintain effluent criteria by ensuring that grease is removed from the
				system. Disposal of grease must be in compliance with all local, State and
				Federal requirements.
(
l
) Any grease removal
				components that are not operated and maintained in conformance with the
				original administrative authority approval or manufacturer's specifications
				shall be considered non-compliant with
				7:9A-3.4.