Aeration basins
A stable foam blanket on the aeration basin, fed by grease in the incoming load and unaffected by the usual mechanical answers.
to clear the foam blanket
01The plant
The effluent works of a beverage and milk processing site in Thailand, aeration basin through to secondary clarifier.
02Before
A new milk line came on stream and the fats and oils in the wastewater rose with it. A heavy brown foam built across the aeration basin and over the clarifier surface, and it stayed. Floating grease, solids and foam were being taken off by hand as a standing task.
03Treatment
A blend built for high-strength fats, oils and grease. The target was the grease load rather than the foam it was supporting — the foam had a food supply, and what was dosed went after the supply.
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.
At the start
Foam across the aeration basin and the secondary clarifier, with floating grease and solids removed by hand as routine.
At the close
Foam gone from both, the clarifier surface back to normal working, and the manual removal no longer needed.
04Limits
Nothing here was counted. There is no grease concentration at either end, no measurement of the foam of any kind, and the sixty days is the publisher's account of when the basin looked right — the record is photographs and description. Nothing was left untreated and the site is not named. What it does carry is a mechanism worth understanding, and that is the only reason it is published.
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 is the article in the range that reaches this — a concentrate for systems that take a metered or poured dose rather than a solid one, which is what a basin under continuous flow is. Nothing in the dry range is the right vehicle for mixed liquor: a sinking solid is built to leave the water column, and mixed liquor is the water column.
SediLogic holds a written dose table for wastewater lagoons and for no other duty, so the planner will not size a basin. A quantity for one is settled with a person against your flow and your loading.
—Read next
Aeration basins
IndustrialImprovement inside 4 months
reported annual saving once settling recovered
Nine months of filamentous growth had taken the settled-volume test above 980 ml/L, so the clarifier could not hold solids and the plant was paying to haul them away.
Aeration basins
IndustrialOne month from a January application
lower effluent BOD within a month of dosing
A million gallons a day of mill effluent, and a BOD figure that climbed every winter as the water cooled and biological activity fell away with it.
Aeration basins
Municipal1 year
reduction in secondary sludge production
A food-processing load arriving at a municipal works, bringing enough grease with it to drive filamentous growth and cost the plant its settling.
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.
