Grease traps
Oil accumulating in the trap faster than the cleaning contract allowed for, and taking a long time to clear at each visit.
less oil accumulation in the trap
01The plant
An outdoor three-chamber grease trap of about 250 litres serving a retail food operation for a Japanese supermarket chain, taking roughly 200 litres a minute through influent, separation and effluent chambers.
02Before
Oil was accumulating in the trap faster than a monthly cleaning contract could stay ahead of, and each visit took a long time because of what had built up between them.
03Treatment
Slow-dissolving blocks suspended in the trap, in phases. The first put a single block in the separation chamber. The second added one to the influent chamber and stripped the netting off it, because the trap's internal flow turned out to be slow enough that the blocks were not dissolving fully where they hung.
Every result in this library was measured at an operating plant treating with one of the formulations SediLogic supplies, over the window stated above. It is a field result published as reported, not a controlled trial we ran.
04Sizing
Per chamber, against the trap's flow and against how each chamber actually behaves. A block only works at the rate water moves past it, which is why the first phase under-delivered and the second did not — the change that mattered was where the block sat, not how much of it there was.
05Outcome
The monthly cleaning schedule was not changed. What changed was how long each one took.
At the start
Oil accumulating through the chambers with carryover into the effluent chamber, and a long clean at every monthly service.
At the close
Oil in the separation chamber roughly halved after the first phase and minimal after the second, carryover into the effluent chamber substantially reduced, and each pump-out taking about half the time.
06Limits
The fifty per cent is a visual assessment. The trap was photographed before scheduled cleanings and the images compared; nothing was sampled and no grease concentration is published at either end, so the figure is an observation rather than a measurement. Nothing was left untreated. The first phase is worth as much as the result: the same product, in the same trap, under-performed until where it hung was changed.
Only the volatile organic fraction of a sludge responds to any of this. Grit, sand, silt, mineral precipitates and plastics remain at any dose, here and everywhere else.
—What we would supply
SediLogic Liquid FOG is the article in the range built for this — a liquid concentrate aimed at fats, oils and grease and dosed into the collection system rather than at a lagoon blanket. A trap takes a metered or poured dose; a sinking solid has nothing to sink to.
SediLogic holds a written dose table for wastewater lagoons and for no other duty, so the planner will not size a trap and we will not guess at one. Tell us the trap, the flow and what it is loaded with, and a quantity is settled with a person.
—Read next
Grease traps
IndustrialOngoing, first results in weeks
reduction in fats, oils and grease
Three restaurant kitchens sharing interceptors that were filling faster than the pump-out schedule could keep up with, with grease backing up into sinks between visits.
Grease traps
Industrial2 years
fewer blockage incidents in the second year
Grease building in kitchen and deli drain lines fast enough to generate a steady run of blockages and emergency call-outs.
Grease traps
Industrial300 days
reduction in BOD and suspended solids in the trap
A trap whose contents were strong enough that every pump-out was charged as high-strength waste.
Your lagoon next
A different plant, a different loading and a different sludge. What decides your result is how much of your own accumulation is organic and treatable, and whether the dose is sized against the lagoon in front of us rather than read off this page. Tell us the dimensions and we will size it.
