Transcript
Can I Add Any Cleaning Agents
to the Trap to Help Clear the
Grease Faster?
No. Never add bleach, emulsifiers, enzymes, or any
other chemical to the grease trap. These agents
harm the natural bacteria that eat grease and oils
in grease traps. The only additive allowed into the
sewer system by BWSC is bacteria. Bacteria consume
fat, oil, and grease in the trap, turning them into
water and carbon dioxide.
Boston Water and Sewer Commission
Additional Information
For additional information regarding the
proper maintenance and care of grease traps,
please contact BWSC’s Enforcement Division at
617-989-7299.
What Methods of Disposal Are
Available for Used Grease?
The food establishment’s waste hauler or renderer
that removes used fryolator grease and oil normally
accepts materials removed from the grease trap. Large
in-ground grease traps normally hold 500 gallons
or more and are usually cleaned by a contractor
equipped to deal with the large quantities of grease,
oil, and non-floatables. It is the responsibility of the
establishment owner to ensure the trap is completely
cleaned.
How May I Receive Assistance From
BWSC When Cleaning the Grease
Trap in My Establishment?
BWSC will provide Grease Control Logs for the
establishment owner to maintain regarding the
cleaning of the establishment’s grease traps. The
log notes the date the trap is cleaned, amount of
material removed, and a signature confirming the
work was performed.
Proper maintenance of grease traps is essential
to the smooth and sanitary operation of a food
establishment.
Boston Water and
Sewer Commission
Community Services Department
617-989-7000
980 Harrison Avenue
Boston, MA 02119-2540
www.bwsc.org
Thomas M. Menino
Mayor, City of Boston
Henry F. Vitale
Executive Director/CFO
and Treasurer
2013
Commercial Kitchen
Grease Trap
Guidelines
What Are Grease Traps?
Grease traps are devices placed on
kitchen cleaning appliances such as
sinks, woks, and any other drains that
collect grease. Properly maintained
grease traps help prevent unwanted
grease build-up in a private building’s
sewer or a Boston Water and Sewer
Commission (BWSC) sewer.
Grease Traps Are Required in
Restaurants and Food Establishments
Cooking grease that gets washed off cooking
appliances and kitchenware can end up causing
significant problems in building drains and BWSC
sewers. BWSC’s regulations governing the use of
sanitary and combined sewers and storm drains
require properly installed and maintained grease
traps in all restaurants and food establishments in
Boston.
Article 111, Section 15, states: “Grease traps shall be
required on sewers into which significant amounts
of animal or vegetable fat, oil or grease may be
discharged so that a discharge concentration does
not exceed 100 milligrams per liter.... The Commission
shall have the right to inspect such facilities in
accordance with Article VII of these regulations.”
For a complete copy of the regulations, go to
www.bwsc.org (Regulations) or contact BWSC at
617-989-7000.
Are There Different Types
of Grease Traps?
How Do I Clean the Grease Traps
and How Often?
Two types of grease traps exist:
Note: These methods of cleaning are for guideline purposes
only; many traps are designed differently and require specific
methods for cleaning. Consult the equipment manufacturer for
instructions.
X
Traps located in an establishment near the fixture
it serves
X
Large traps located outside the building in the
ground that serve the entire kitchen
X
What Fixtures in My Food
Establishment Require a Grease Trap?
Grease traps should be cleaned when 25% of
the liquid level of the trap is grease or oil, once
a month minimum for point-of-use traps, and
quarterly for large in-ground grease interceptors.
X
Significant amounts of grease in buildings and BWSC
sewers can come from the following fixtures:
The cover should be removed carefully to avoid
damage to the gasket.
X
Ladle off the layer of grease and oil floating on top
of the water.
X
Remove any baffles and scrape clean. After
cleaning, the baffles can be rinsed off in the sink
that flows to the trap.
X
Using a strainer, scrape the bottom of the trap
to remove all non-floatable food particles and
debris.
X
Clean the bypass vent with a flexible probe
or wire.
X
Reinstall baffles and cover.
X
Pot Sinks
X
Rinse Sinks at Dishwashers
Note: Garbage disposals should not be installed on these
sinks.
X
Dishwashers Outside Trap Only
Note: Dishwashers cannot flow through a point-of-use trap
inside a building.
X
Woks
X
Floor Drains and Sinks
X
Automatic Hood Washers
Note: The grease trap should be completely emptied once a month.
Many establishments have an independent contractor that
specializes in grease trap cleaning perform the work.
All interior grease trap installations are subject to state and local
plumbing codes.
Pot Sink
Vent Line
Flow
Control Solids
Interceptor
(Optional)
Air Relief Bypass
Grease
Water
Solids
Grease and solids from food establishments that enter a grease
trap remain in the trap, separated from the water, which gets
flushed to the sewer system. Periodically, the trap needs to be
opened and the grease and solids removed to allow the trap to
continue operating properly.