On a biosolids lagoon, S3S turned decades-old sludge into 550 tons of dry, stackable solids and sent clean water back to the basin. The same closed-loop model applies to waterfront sediment.
Marine & Waterfront
Over the water. Clean water back. Dry solids off.
Stage 3 Separation (S3S) brings modular solids control and dewatering to marine construction and waterfront sediment work. We separate on site, return clear water to the waterway, and send solids off dry and load-ready.
By the numbers
What a compact separation system does over the water
Marine and waterfront sites give you almost no room and a waterway you cannot contaminate. A self-contained separation system fits the deck space you have, keeps material out of the water, and proves what leaves the site.
The dewatered solids from that lagoon passed every paint-filter test, so the material moved to disposal in standard end-dump trucks. Dry enough to haul, dry enough to pass the gate.
Ready equipment staged across North America means S3S can be rigged up and processing on a waterfront or barge-based site inside a day.
Thirty-plus years across dredging, municipal, energy, industrial, and construction work. The separation problem in front of you is one we have run into before.
What you get
Space you don't have. Water you can't foul. Solids that pass.
A waterfront job stacks three constraints at once: barely any deck footprint, a waterway under scrutiny, and solids that still have to leave dry. S3S handles all three on one modular system.
01
→A footprint that fits the barge or quay
Compact, self-contained, modular systems fit barges, docks, and space-limited quaysides, then scale up or down to the volume in front of you. No lagoons, no pits, no separate equipment yard, and it moves when the work does.
02
→Clear water back to the waterway
Water comes in as slurry and leaves clean enough to return to the harbor or waterway, reuse on site, or discharge where permitted. That closed loop is what keeps an environmentally sensitive site out of trouble.
03
→Dry, load-ready solids
Harbor sediment and marine-construction spoil leave as a dry, stackable pile instead of a soupy slurry. Lighter to barge or truck off, cheaper to dispose of, and dry enough to pass the paint-filter test at the gate.
How a waterfront project works
From the barge deck to the disposal gate
Tell us the material, the volume, the site, and what you need back. From there it is on us. We engineer the system to fit the water's edge, prove the chemistry in the lab, run it on location, and document the result.
01
Characterize the material and the site
We test the sediment or spoil for solids load, particle size, contaminants, and dewaterability, then design the system around the deck space, access, and the discharge target before anything mobilizes.
02
Set up over the water and run
Our crew rigs the modular train onto the barge, dock, or quay, injects polymer to bind the fines, and pulls water out of the material as it feeds through.
03
Return water, load solids, prove it
Clean water goes back to the waterway, dry solids load out for haul-off, and you get the sampling and volume data that regulators and disposal sites want to see.
Our advantage
Building over the water is hard enough.
Handling what comes up shouldn't stop the job.
You handle the foundations, piling, seawalls, and quays. The separation problem, turning spoil into clean water and disposal-ready solids on a crowded barge, is the part S3S owns.
We are not a rental yard. We engineer the system around your material and site, put our own people on it, and stay to the last load. We compete on total project cost, not the lowest bid.
Built for tight, over-water sites
Compact, self-contained, modular systems fit barges, docks, and space-limited quaysides. The system claims the deck space you can spare, not the footprint you don't have.
Environmentally sensitive by default
Discharge into a harbor or waterway is under scrutiny before the job starts. We build the chemistry, containment, and clear-water loop around keeping material out of the water and the discharge inside spec.
Proof regulators accept
Real-time material verification and sampling document what the returned water and the solids meet, so discharge and disposal decisions rest on data, not assumptions.
One system, from slurry to stackable
01
Material fed straight into the modular separation train on deck
02
Clear water returned to the harbor or waterway
03
Dry, load-ready solids staged for haul-off
The work we do
One platform across the waterfront
Harbor and port operations, marine construction support, or contaminated harbor-sediment handling: the material changes, but the model stays the same. Characterize the stream, size the system to the site, run it over the water, return clean water, and prove the result.
Keeping harbors and ports working
Ports and harbors generate sediment and process water that has to be managed without shutting the waterway down. We deploy modular separation into the working footprint, dewater on site, and return clear water so operations keep moving.
- Input
- Harbor and port sediment and process water
- Output
- Clear water returned, dry stackable solids
- Best fit
- Working harbors, ports, and terminals
- S3S role
- Design, run, and prove the loop
We show up.
We separate.
The water goes back clean.
Proof from the field ↓
550 tons off a biosolids lagoon
S3S de-sludged two anaerobic sewage lagoons using a closed clear-water loop. The sludge came out as 550 tons of dry, stackable solids that passed every paint-filter test, and clean water went straight back into the lagoons. The clearest proof of the closed-loop model this page is built on.
Biosolids lagoon remediation
Dredged a refinery pond, start to finish
On a working refinery site, S3S dewatered an entire industrial pond, returned clean water, and hauled off dry, stackable solids. A first-of-its-kind job for the crew, and it ran clean, on a live site with no room to spare.
Industrial pond dewatering
On site and running in 24 hours
When a customer calls, we can be rigged up and processing on a waterfront or barge-based site inside a day. That comes from staging ready equipment across the continent and servicing it before it is needed, not after.
North American field operations
Less material in the landfill
Pulling the water out on site routinely cuts the volume hauled off by roughly half. Fewer trucks and barges, far less material buried. We are a separation company, but we are an environmental one too.
Dredging and marine work
Dredging
When the job is dredge spoil or sediment dewatering itself, the process and the on-site-versus-haul-off economics live here. Closely related work, its own deep dive. Marine and waterfront work sits next to our dredging and heavy-civil lanes. Our deep-dive pages walk through the sediment-dewatering process, the economics, and environmental compliance.
Environmental compliance in dredging operations→Marine applications
Waterfront work removes both options you normally have: there is no room for a settling pond and no easy route for a truck. S3S separates on the footprint that exists and returns clear water to the waterway.
Marine piling
Piling over water leaves nowhere to put a pit and no simple route for a truck. S3S supports reverse circulation piling from the barge or the shoreline, taking the return straight off the pile, separating it within the deck space available, and sending clear water back to the waterway. You handle the foundations, piling, seawalls, and quays. We handle what comes back up.
Waterfront remediation
Contaminated waterfront sediment is priced by the cubic yard, and traditional dredge spoil disposal can run past $500 a yard. Most of what you are paying to move is water. S3S separates the sediment at the water's edge, returns clear water to the waterway, and sends dry, load-ready solids off site.
On-site processing cuts transport and disposal cost by 60 to 80%, and clean aggregate can come back out of the stream for beneficial reuse and wetland restoration.
60 to 80%Lower transport and disposal cost through on-site processing
Common questions
Marine & waterfront separation, answered
Stage 3 Separation (S3S) provides modular solids control and dewatering for marine construction and waterfront work: harbor and port operations, marine foundations, seawalls, piers and quays, coastal restoration, and contaminated harbor-sediment handling. We run compact equipment over the water, return clear water to the waterway, and produce dry, load-ready solids.
Yes. The systems are compact, self-contained, and modular, so they fit barges, docks, and space-limited quaysides without lagoons, pits, or a separate equipment yard. We size the train to the deck space the site can actually spare and scale it up or down to the volume.
We run a closed clear-water loop and build the chemistry and containment around keeping material out of the water. Water comes out clean enough to return to the waterway or discharge where permitted, and real-time verification and sampling document that the discharge meets the required criteria.
Yes. Contaminated and remediation material is core work. We handle it with containment, purpose-built chemistry, and real-time verification, so the separated solids and returned water are documented against the criteria regulators and disposal sites require.
Marine & Waterfront covers ports, harbors, and marine construction, the over-water build-out and the sediment that comes with it. The Dredging page covers the dredge-spoil and sediment dewatering process and the on-site-versus-haul-off economics in depth. Closely related work, so the pages cross-link, but each owns its lane.
S3S can be rigged up and processing within 24 hours, because ready equipment is staged across North America and serviced before it is needed. Larger or longer jobs are the best fit, where sustained on-site treatment clearly beats repeated haul-off.
Your harbor sediment
is a resource.
S3S turns harbor sediment and marine-construction spoil into clean water returned to the waterway and dry, stackable solids that pass disposal, on a footprint the barge or quay can actually spare.
A smaller footprint, fewer trucks and barges, lower disposal cost, and one team that owns the whole job from the water's edge to the disposal gate.
Harbor and port operations, marine construction support, and coastal and contaminated-sediment work. Deployed across North America.