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
Liquid is intended for systems with metered or poured dosing and organic load in the water column. Sinking solids are designed for settled bottom sludge.
The planner does not calculate quantities for an activated-sludge basin. Send the flow and loading for review. A lagoon dose table cannot be transferred to this application.
—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
This result came from a different plant. Your sludge composition and operating conditions need their own assessment. Send us your lagoon details for a dosing review; do not use the quantity on this page as your application rate.
