Wastewater lagoons
A floating crust around a foot and a half thick, stiff enough to interfere with pumping the lagoon down for land application.
reduction in crust thickness
01The plant
A dairy manure lagoon of about 5 million gallons.
02Before
A floating crust around a foot and a half thick had formed over the lagoon, stiff enough to make pumping down for land application difficult.
03Treatment
A single high-strength treatment over four weeks, applied to roughly a third of the lagoon rather than the whole surface.
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
A localised charge against the treated third rather than a rate across the whole lagoon — which is why this record is not a guide to dosing a lagoon of this size.
05Outcome
Pumping for land application was reported as easier once the crust broke down.
At the start
A floating crust roughly 18 inches thick, difficult to pump.
At the close
Crust down to about 2 inches, liquefied enough to pump for land application.
06Limits
Only a third of the lagoon was treated, and the record does not say whether the untreated remainder was measured — so the closest thing here to a comparison was not used as one. No laboratory analysis, no method for measuring crust thickness, and no facility or location are recorded. An 87 per cent reduction in a floating crust is not the same measurement as a reduction in the settled accumulation below it.
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
Spike and Puck are sinking solids for bottom sludge. Maintain is a soluble pouch for organic load in the water column, with Polar for cold-water conditions. The planner calculates quantities only for products with a written dose method; Puck and Polar need a separate review.
Use the written dose method for your product and lagoon. A quantity reported in a case study was chosen for that site and should not be used as your application rate.
—Read next
Wastewater lagoons
Municipal24 weeks
of accumulated solids digested
Just over five feet of accumulated solids in the primary aerated lagoon, assessed at 2,365 dry tons. The plant wanted a route that did not involve dredging.
Wastewater lagoons
MunicipalFive months, May to October
reduction in solids volume overall
Accumulated solids across two lagoon cells, against a specification calling for a 50 per cent reduction. The treatment window was bounded by water temperature, which has to stay above roughly 55°F for the organisms to work at all.
Wastewater lagoons
Municipal3 months
of organic solids digested
Decades of loading had taken the lagoon to a measured 20.5 per cent solids, with a dredging quotation in hand and no budget line to meet it.
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.
