Interceptor vs. Trap:
Understanding the Difference
In our industry, the terms “interceptor” and “commercial grease trap” are often used interchangeably. However, they serve distinct functions and have different mechanisms.
What is a Typical Interceptor?
An interceptor uses an inlet downturn to slow down water flow, allowing gravity to separate solids and FOG (fats, oils, and grease). Water then flows through baffles between compartments, filtering out additional FOG and solids. Clean water exits the interceptor through the outlet downturn.
What is a Typical Commercial Grease Trap?
A commercial grease trap features an inlet baffle wall that slows down water flow, promoting the separation of solids and FOG. Solids are blocked by baffles on the trap’s floor, while clean water exits through the outlet baffle.
The Importance of Proper Maintenance
Improper maintenance can lead to serious issues. If an interceptor is not correctly maintained, it may allow FOG to enter the city’s sewer system, causing blockages in private lines. This can result in Sanitary Sewer Overflows (SSOs) or private blockages that may spill outside a facility or back up inside. Traps with holes can also let material penetrate the ground beneath a facility. The City of Phoenix has some great resources on how to successfully navigate all of this!
Risks of Ineffective Interceptors and Commercial Grease Traps
No interceptor or trap is 100% effective at retaining grease, oils, and solids. Over time, these materials can escape and coat the inside of pipes, leading to frequent, costly hydro jetting of sewer lines.
When an interceptor or trap is not maintained properly:
- Excess buildup can cause blockages and surcharges.
- Missing or broken baffles reduce grease separation efficiency.
- Grease entering city sewer systems can lead to SSOs, blockages, and stoppages.
- Surcharges and blockages can delay your establishment’s opening until resolved.
- Over time, grease can become acidic and corrode or destroy your interceptor or trap.
What is Interceptor Maintenance?
To keep an interceptor functioning efficiently, you must pump and clean it periodically. Most interceptors lose effectiveness when fats, oils, and solids reach 25% of the device’s capacity.
How Often Should You Pump Your Interceptor?
- Every 30 days for a commercial grease trap
- Every 90 days for a grease interceptor
- Every 6 months to annually for a lint or sand/oil interceptor
Your interceptor might need more frequent pumping based on the amount of sand, oil, fats, and solids your facility generates. Reducing what you put down your drains will lessen the need for frequent pumping.
If you can’t remember your last pump, it’s time to schedule a service. In Phoenix and surrounding towns, pumping records must be on-site for at least 3 years for inspection. Priority Pumping provides folders and digital invoices for easy record-keeping, ensuring you’re prepared for inspections.
