Wastewater lagoons
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.
of accumulated solids digested
01The plant
The primary aerated cell of a municipal lagoon works, a little over 255 by 270 feet at the water line.
02Before
Decades of loading had left just over five feet of accumulated solids across the cell, assessed at 2,365 dry tons, with fats, oils and grease through the accumulation. A dredge would have cleared it and the plant did not want to pay for one.
03Treatment
Dosed from a boat over twenty-four weeks, drawn from a 55-gallon drum through a liquid-and-air delivery system so the material was carried into the water rather than left on the 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
The opening quantity was set against the cell's volume, and the doses that followed against average daily flow. Both are bases rather than rates — your own lagoon is sized in the dosing planner and nowhere else.
05Method
Depth readings across the cell, converted to dry tons. A microscopic examination of the mixed liquor was run at the close.
06Outcome
31.8 inches of accumulation gone at better than an inch a week, and the dredge deferred rather than ruled out — the inert fraction is still on the bottom and no dose reaches it.
At the start
5.08 ft average accumulated depth, 2,365 dry tons, grease through the accumulation.
At the close
2.65 ft average depth, 1,340 dry tons remaining, and a microscopic examination reported the plant working normally with low suspended solids.
07Limits
Nothing was left untreated to compare against, so the share of the reduction owed to the product rather than to a warm season under aeration cannot be separated out. The volatile fraction of the accumulation at the start is not recorded either, which is the number that would say how much of the 2,365 dry tons could ever have responded.
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
This is the duty SediLogic supplies and sizes. Which article depends on where the material sits: Sedivore Spike is the denser solid and carries down through depth to an established blanket, Sedivore Puck is a smaller unit that spreads a calculated dose across the bed, and SediLogic Maintain is a soluble pouch for load carried in the water column — with Sedivore Polar for that same duty where the water runs cold enough to stall a standard blend.
A quantity for your own lagoon comes from the dosing planner, sized against your dimensions and loading from the manufacturer's written dose method. It does not come from the figure on this page, which was set for a lagoon that is not yours.
—Read next
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.
Wastewater lagoons
Industrial12 months
reduction in accumulated solids
Accumulated solids had cut hydraulic retention time to 13 days, capping what the facility could put through the plant and putting effluent quality within sight of a limit.
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.
