One of the most overlooked items in an industrial kitchen — and one of the most common reasons for a municipal fine — is the wastewater line. Fat, oil and grease from dishwashers, griddles and pot-wash stations will clog the sewer line and put your license at risk if it isn't intercepted properly. Here's how to choose the right grease trap and manage wastewater the way it should be managed.
Why a Grease Trap Is a Legal Requirement, Not an Option
Wastewater discharge regulations and municipal sewer connection permits set a maximum fat-oil-grease (FOG) concentration for anything a commercial kitchen sends into the sewer system. Exceeding that limit can mean fines and, in some cities, suspension of your operating license. A grease trap installation is typically one of the documents requested during the restaurant licensing process itself.
How to Calculate the Right Capacity
Grease trap sizing is based on daily meal count, peak-hour flow rate (liters per second) and the wastewater's retention time inside the trap — a small café and a 500-cover central kitchen simply don't need the same unit. An undersized trap fills up within days and stops doing its job, so capacity should be engineered around actual daily production volume together with your equipment supplier.
Point-of-Source or Centralized? Choosing the Right Type
Small and mid-sized kitchens usually do fine with a stainless steel (AISI 304) point-of-source trap installed under the pre-wash sink, while high-volume production kitchens need either an in-ground centralized grease interceptor or an Automatic Grease Removal Unit (AGRU). An AGRU skims and transfers grease into a separate container on a set schedule, which cuts manual cleaning down significantly.
Never Skip the Maintenance Schedule
Passive grease traps need to be emptied and cleaned anywhere from weekly to monthly depending on production volume; putting this off means the trap fills up, odor builds, and a clogged line can shut the whole kitchen down. Municipalities can ask for cleaning records during inspections, so documenting regular maintenance matters just as much as sizing the unit correctly.
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