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SediLogic Technologies

Collection systems

Municipal sewer system

Ten thousand dollars a month going on grease removal from force mains and lift stations, on top of a chemical dosing programme.

70%

reduction in fats, oils and grease

Field result
Duty
Collection systems
Sector
Municipal
Treatment window
30 days
What was counted
Fats, oils and grease
  • A 50 per cent reduction reported in disposal cost
Interior of a wastewater lift station wet well with pump pipework.
Illustration — a lift station wet well, not the system described on this page.

01The plant

What was being treated

A municipal sewer collection system dosed at three upstream points.

02Before

How the material got there

The system was spending about $10,000 a month having grease removed, and running 100 to 300 gallons a day of calcium nitrate.

03Treatment

What was applied, and how

Liquid product dosed at three upstream locations, several times a day during low-flow periods, over a thirty-day opening programme.

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

What the quantity was set against

Positioned upstream and timed to low flow so the product had contact time before reaching the problem, rather than sized against a volume.

05Outcome

What followed

Calcium nitrate use fell from 100–300 gallons a day to about 50.

At the start

About $10,000 a month in grease removal.

At the close

70 per cent less grease — some 655 gallons a day — and disposal costs halved.

06Limits

What this record does not establish.

The system's size and flow are not given, so 655 gallons a day of grease has no denominator. No baseline period is described, and a thirty-day window in a collection system takes no account of seasonal variation in grease loading. Nothing was left untreated.

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

For this duty, in our range.

SediLogic Liquid FOG is the article in the range built for this — a liquid concentrate aimed at fats, oils and grease, dosed into the wet well or upstream of it. A wet well cycles too fast for a solid to be the right vehicle, and the material to be digested is on the walls and in the cap rather than on a bed.

SediLogic holds a written dose table for wastewater lagoons and for no other duty, so the planner will not size a wet well. Tell us the station, the cycle and what is reaching it, and a quantity is settled with a person.

Talk to us about a wet well

—Read next

The same duty, measured somewhere else.

  • Collection systems

    Municipal sewer line

    MunicipalOngoing

    2 to 7months

    between scheduled clean-outs

    Field resultUntreated control

    A line that needed clearing every two months to stay ahead of grease accumulation.

    • Dosed from a slow-release block rather than a metering pump
    • The upstream section of the same line was left untreated
    Fats, oils and grease

  • Wastewater lagoons

    Food processing lagoon, Midwestern United States

    IndustrialJune to September

    100 to 60%

    surface coverage by the grease cap, in three weeks

    Field resultConfounded

    A fat, oil and grease cap covering the whole lagoon surface, cutting oxygen transfer into the water beneath it and standing between the plant and its irrigation discharge.

    • Cap thickness 6 in to 2 in
    • 75 per cent less material reported as requiring dredging
    • Surface aerators were taken out of service during the same period
    Fats, oils and greaseSludge depth and solids

  • Grease traps

    Grease interceptors at a large resort

    IndustrialOngoing, first results in weeks

    71%

    reduction in fats, oils and grease

    Field result

    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.

    • A 40 per cent reduction reported in treatment cost
    Fats, oils and grease

All field results

Your lagoon next

This was measured somewhere else.

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.

Get a dosing planSee the products