Stage 3 Separation
Stage 3 separation equipment at a refinery, with the blue tank panels digitally recolored to Stage 3 navy

Separation and dewatering for industrial sites and municipalities

S3S separates slurry, biosolids and oily waste on site into water, solids and, where there is oil, recovered oil. You haul solids instead of liquid, and our lab can test the water so you know where it can go.

Industrial and municipal work we support

On-site dewatering makes the most sense when there is a steady volume to process and hauling liquid is expensive.

Hydrovac slurry processing

For large or long-running hydrovac operations, S3S provides on-site separation to reduce reliance on off-site slurry disposal. Recover water for reuse and haul stackable solids by dump truck, reducing liquid waste hauling and per-load disposal fees. Solids disposal options depend on material testing and local requirements.

Vacuum trucks staged for material transport at a project site

Tank and vessel cleaning

S3S uses three-phase centrifuges to separate tank bottoms and oily residues into recoverable oil, effluent, and solids, maximizing oil recovery and reducing waste volumes. Dissolved air flotation (DAF) provides additional removal of oil and fine solids from effluent. Waste classification and disposal routes are confirmed before mobilization, particularly for U.S. refinery residues that may be listed hazardous waste.

Stage 3 Separation equipment operating beside an industrial refinery pond

Wastewater separation and treatment

Settled solids reduce treatment capacity in lagoons and digesters. S3S uses polymer conditioning and centrifuges to dewater slurry on site, producing stackable solids and reducing liquid waste hauling. At Hardisty, Alberta, S3S dewatered material from two sewage lagoons that had not been processed since the 1970s, returning effluent to the lagoons.

Aubrey TX Dredging — S3S photo 53
100%Paint filter tests passed, Hardisty lagoons

Mining slurry treatment and water separation

Settling and process ponds at mines and aggregate wash plants fill with fine silt and clay. The BE-300 plant removes sand and coarse material, and centrifuges remove the fines, so the water can be reused and the solids hauled. Mobile equipment fits settling pond and sump cleanouts, fines dewatering at smaller operations and pilot projects. Large tailings facilities are usually handled by fixed plants.

AI illustration of a mine processing site with a contained tailings settling pond

How we approach industrial and municipal slurry treatment

From sampling to execution.

Laboratory jar tests showing floc formation and settling below clearer liquid
01

Test a sample

Our lab can test your slurry, biosolids or oily waste before we pick the equipment.

Aubrey TX Dredging — S3S photo 4
02

Set up

S3S configures and deploys the right combination of tanks, centrifuges, three-phase separation, and DAF equipment to match your waste stream, throughput targets, and available site space. S3S fabricates job-specific components in its own shop.

Aubrey TX Dredging — S3S photo 50
03

Separate

Our technicians operate the system, test solids and effluent, and adjust the process throughout the job to maintain performance and meet your project targets.

Common questions from plant and utility managers

It depends on the material. At Hardisty, lagoon biosolids dewatered to an average of 33% solids and passed 100% of paint filter tests. Our lab can test your material first.

Only within the limits set by your sewer authority or discharge permit. Our lab can test the water on site so you have the results.

U.S. listed hazardous waste generally remains hazardous after treatment unless delisted. Dewatering reduces waste volume, not its classification.

Yes. Our three-phase centrifuge separates oil, water and solids so the oil can be recovered. Whether the recovered oil can be sold depends on the buyer's limit for basic sediment and water (BS&W).

Talk to an equipment specialist about your waste stream

We tailor separation systems to your slurry, site, and targets, maximizing reuse and reducing disposal costs.

What happens next

  1. An equipment specialist reviews the details with you.
  2. We recommend the equipment and crew.
  3. You get a scope you can price.
Contact an equipment specialist