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Article #111: Determining the correct size of Grease Traps

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grease and food wastes every day. If this specified businesses. This is because
waste is not managed properly, it can untrapped oil and grease in the
cause major environmental problems. Much wastewater decreases pipe capacity over
of the waste is in solid form and can be time and eventually will cause the pipe
safely put in packages and placed in the to clog. Piping systems without grease
trash. Liquid waste containing oil and traps need to be cleaned more often and
grease dumped directly into the sewer, some piping may have to be replaced
however, can block the system and cause sooner than otherwise expected. Excessive
wastewater to flow back-up .To avoid this grease sent to the wastewater treatment
you have to install and properly maintain plant can also overload their system and
a grease trap. cause the facility to exceed its
Grease traps capture the oil and grease allowable discharge limits. Running
from the flow of wastewater by slowing extremely hot water down the drain only
down the flow of hot greasy water through moves the problem down stream, and may
the grease trap (actually a tank) and only make it worse. Fixing a sewer line
allowing it to cool. As it cools, the blockage can be expensive, both in terms
grease and oil separate out of the water of potentially lost customers and repair
and float to the top of the trap. The cost. If the pipe clog is within your
cooler water continues to flow down the building sewer line, you will be
drain pipe to the sewer while baffles responsible for fixing the problem and
prevent the accumulated grease and oil paying all costs. If the clog is in the
from flowing out of the grease trap. The public sewer line, but can be traced to
size of the grease trap depends largely your restaurant, you will be liable for
on how much waste your business produces paying all or a portion of the repair
and how often you perform trap costs. Accumulating the oil and grease
maintenance. Grease traps may be located close to the source in a properly
inside or outside of the building. Traps maintained grease trap is the most
that are located inside the building tend cost-effective way.
to be smaller and require more frequent There are several ways to maintain a
maintenance. Traps that are located grease trap and dispose of the wastes.
outside the building tend to be larger Your decision will likely be based on
and may be less disruptive to maintain. cost, availability of services, and
Outside grease traps will operate disposal/ recycling opportunities in your
differently in winter versus summer and area. Most restaurants hire a
are more prone to clogging during cold professional pumping service to remove
weather. As a business owner/manager, you the waste from the grease trap and
should know where the grease trap, drain dispose of it properly. Some areas have
lines, and clean-outs are located at your service companies that specialize in
restaurant. grease trap wastes, while other areas may
Proper cleaning and maintenance of the have pumping contractors that service
grease trap and drain line reduces the grease traps, sand traps, and septic
amount of solids and grease going into tanks. Pumping service contractors can
the public sewer system and minimizes the usually be found in the yellow pages of
likelihood of back-ups or blockages. Some the telephone book under the listings for
sanitation districts and/or "Grease Traps and Service", "Septic
municipalities require grease traps and Tanks".
periodic maintenance and inspections for






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