In the late 1980s, The Narragansett Bay Commission (NBC) provided a great example of how to maximize control when it carried out one of the most effective Pretreatment programs I've seen in my career. It had to implement an audacious pretreatment program to reduce downstream wastewater treatment plant loadings sufficient to meet the EPA’s first Marine Estuary Guidelines. The NBC was in a tough spot.
Pretreatment’s Three-Legged Stool
A simple, yet effective way to explain on-site pretreatment is to use a three-legged stool analogy.
A three-legged stool works only when all three legs are the same length and angle and have the same strong attachment to the stool seat. If any leg is shorter, at a different angle, or loosely connected to the seat, the stool is unstable.
The same is true for onsite pretreatment. A food service establishment (FSE) may have
Leg 1: The right grease separator and
Leg 2: Good servicing (pumping frequency and quality)
But if it has poor internal management practices (Leg 3), the FSE will send higher than allowed waste into the sewer system.
Likewise, a site skimping on pumping (Leg 2) will handicap its proper technology (Leg 1) and best management practices (Leg 3). Upcoming blog posts delve into practical information for each of these legs. We begin with Best Management Practices 101.