Overview
Every reverse-osmosis desalination plant has a second address that appears on no map: the patch of seabed directly off its outfall. There lies a dense, hypersaline, poisonous bottom layer loaded with heavy metals, microplastics, debris and process chemistry, creeping across the floor as a silent brine underflow. No slick, no smell — only a grey, silted, lifeless murk where nothing moves.
Arbok-DECOMP is a decontamination technology, explicitly distinct from water production (fresh water is Arbok-Desal's job). It lifts what is called waste off the bottom without pumps and without mechanically re-suspending it, then separates it under deep vacuum into clean water, metal salts, technical salt, sand and clay, fuel pellets and oil cake. The metals are recovered rather than buried, the salts that were poisoning the benthos become saleable stock, and water recovery reaches near-complete levels with zero liquid discharge — as drinking water.
Applications
Aquatories of RO desalination plants — more than 21,000 sites worldwide, rising fastest exactly where water is scarcest: the Gulf, the Red Sea, North Africa, the coasts of the Americas. Saudi Arabia, the world's largest producer of desalinated water, is the reference case. Recurring service rather than one-off cleanup: while the plant runs, the bottom silts up again, so decontamination is tied to each outfall as a repeating campaign. Also applicable to the same physics already used for port-sludge cleanup, where the object is a harbour rather than an RO discharge field.
Operating Principle
Part one — lifting without pumps. Arbok Water Upwelling (AQWU) raises the bottom mass — hypersaline pore water together with contaminated silt — on the principle of communicating vessels and an airlift, not high-pressure pumps. A short impulse starts the column; the water-and-sediment mixture then rises inside the pipe by hydrostatic imbalance and flows essentially on its own. Because the lift is gentle and enclosed inside the riser, it does not re-suspend contamination into open water the way a mechanical dredge does — the poison goes up the pipe, not out into the current.
Part two — separation into products. What rises up the riser is fed straight into Arbok-ZWD, a deep-vacuum phase-separation unit. Under vacuum, water evaporates at ambient temperature — no reagents, no membranes, no filters. Everything dissolved and suspended separates by volatility and density into clean streams. Heavy metals leave as distinct salts. The hypersaline water splits into fresh water and dry technical salt. The mineral fraction comes out as clean sand and clay, the organics as dry fuel pellets, the oil residue as a separate cake. There is no landfill because there is nothing to bury. Output quality is governed by Arbok's built-in monitoring, tonne by tonne, rather than by a report after the fact.
What the incumbent methods cannot do. Dredging fails on every axis: mechanically disturbing contaminated sediment re-suspends the metals into the water column, smearing the poison rather than removing it. The spoil cannot legally be re-dumped at sea — the London Convention and regional regimes (OSPAR, U.S. EPA) forbid it precisely because of the heavy metals — so the mass is hauled ashore, trucked to confined facilities, cemented into blocks or capped in place. The metals are never recovered, only relocated and held as a liability for decades. The industry's other answer, that the sea will dilute it, is a deferral rather than a solution. Membrane logic and biological treatment, the reflexes of the water industry, are useless on the sea floor.
Key Parameters
| Parameter | Value |
|—|—|
| Process temperature (ZWD stage) | ambient — under vacuum water evaporates at ambient temperature |
| AQWU lift depth | down to 1,500 m |
| AQWU startup energy | minimal — a brief, low-energy startup pulse |
| AQWU compressor power | a single solar panel |
| AQWU module throughput | 100–150 tonnes of bottom mass per hour |
| Arbok-ZWD energy | very low specific energy consumption, well below RO desalination levels |
| Water recovery | near-complete, zero liquid discharge, drinking quality |
| Process CO₂ | very low — a small fraction of conventional dredging and disposal alternatives |
| Fuel pellet calorific value | 14 MJ/kg |
| Three-module complex campaign rate | ~1 km² in 10–12 days, lifting ~500 tonnes of contaminated mass |
| Complex annual coverage | ~30 km² per complex per year |
| Campaign startup energy | tens of kWh per campaign |
| Reagents, membranes, filters | none |
| Brine share of intake water (RO) | 60–70% |
| Brine concentration at outfall | 10–11% |
| Gulf salinity trend | 3.5% → 5.2% over 20 years |
| Bottom-water salinity rise in the discharge field | up to 2.2× |
| Damage zone | worst within 50–300 m of the outfall, measurable to the plume edge |
| Degraded seabed per billion m³ of annual brine | ~500 km² |
| Typical outfall distance in practice | at the shore, or 200–300 m out; up to 3 km where proper diffusers are installed |
| Metals present | cadmium, lead, mercury, copper, zinc, tin |
| Process chemistry present | polyphosphonate antiscalants, ferric coagulants, antifoaming agents, membrane-cleaning acids, biocides |
Architecture and Components
AQWU module mounted on a barge or pontoon, with a polymer riser running to the deposit; autonomous and remotely operated; scaled by adding a second pontoon. Solar-powered compressor providing the starting impulse. Enclosed riser carrying the water-and-sediment mixture to the surface. Deep-vacuum Arbok-ZWD phase-separation unit receiving the lifted mass directly. Product streams: metal salts, fresh/drinking water, dry technical salt, clean sand and clay, fuel pellets, oil cake. Built-in tonne-by-tonne output monitoring. A working complex is three modules; a decontamination fleet is built by adding vessels, each sailing to the next outfall when a field is finished.
Advantages
Lifts without re-suspension — the contamination travels inside the riser, not into the current, which is precisely where dredging fails. No legal disposal problem, because nothing is disposed of: the metals are recovered as salts and sent to processing rather than into a vault forever. Runs on gravity and sunlight: lift is by hydrostatic imbalance with a solar compressor, separation runs under its own vacuum, so variable cost is near zero and only labour and depreciation remain.
Every fraction has value. The bottom mass off an RO outfall is a blend of three streams: sediment heavy metals (copper, zinc, lead, cadmium, tin) recovered as salts; hypersaline pore water carrying — beyond technical salt — magnesium, bromine, lithium and potassium, the very exchange-traded materials the Gulf states import today, often from one or two monopoly suppliers; and clean sand and clay as ready construction material with organics pressed into fuel pellets. Not one fraction is waste, which flips the sign of the project: what you pay to bury, with fines and perpetual liability, becomes a line of revenue.
Environmental return: removing brine at the outfall takes away the Gulf's main source of salination, halting and reversing the salinity rise because the water returns to circulation as fresh instead of concentrating the sea. Producing ~9 billion m³ of water from brine instead of building new RO plants saves on the order of 80 billion kWh a year — about 50 million tonnes of CO₂ annually at ~0.6 kg CO₂ per kWh on the Saudi grid.
Commercial structure: BOOM — the fleet stays Arbok's, and the state or operator pays a fixed rate per tonne of contamination lifted and neutralised. Zero capital outlay for the client, full quality control.
Integrations
Arbok Upwelling · Arbok-ZWD Gasification · ARBOK-Port-Sludge-Cleanup · ARBOK-MarineSludge · ARBOK LIGHT-SALT · Arbok-Potassium · ARBOK-Lithium · ARBOK-Rubidium · ARBOK-Cesium
Arbok-Desal and Arbok-DECOMP are complementary and are constantly confused: producing drinking water from live seawater or fresh brine is Arbok-Desal's job with economics that stand alone; DECOMP does the inverse work on a discharge field already poisoned. Together they close the loop; apart, each is a business.
Deployment & Operation
Containerised and mobile. Barge- or pontoon-mounted, autonomous, remotely operated, with a polymer riser lowered to the deposit. A campaign clears about 1 km² in 10–12 days with a three-module complex. Delivered under a BOOM agreement with pay-per-tonne pricing and no capital cost to the client; pilot decontamination tracks are offered per outfall, opening with a site assessment. Because the plant keeps discharging, service is recurring per outfall rather than one-time.
Crewing, permitting sequence and campaign logistics are established per jurisdiction during project mobilisation, in coordination with the site operator and local maritime authorities.
TRL
TRL 5 — validated at pilot scale in a relevant operating environment, with containerised, mobile deployment and pilot decontamination tracks underway.
Market Potential
Roughly 21,000 desalination plants worldwide, each with a discharge field — collectively one of the largest and least-acknowledged contaminations of coastal sediment on Earth. About 9.2 billion tonnes of brine are dumped into the sea each year; even at the $50/m³ floor for regulated toxic sediment, that is on the order of $440 billion a year in avoided liability. With the 2030 doubling, ~18.4 billion tonnes of brine a year, disposed of today for free by drowning it in the sea.
Saudi Arabia as reference: 16 million m³ of desalinated water a day; at RO recovery of only 30–40%, about 24 million m³ of brine returned to the Gulf every day. At ~500 km² of degraded seabed per billion m³ of annual brine, the Kingdom's discharges touch on the order of 4,400 km² of sea floor. Intake water is now far saltier than design, driving up energy, extra reagents and faster replacement of membranes costing $1 million and more. By 2030 Saudi Arabia intends to double desalination — twice the water means 2.2 times the underflow and as much contaminated bottom again.
Decontaminating 4,400 km² by 2030 calls for on the order of 36 Arbok Upwelling vessels working in parallel.
For governments the calculation is no longer cleanup versus cost, but: keep paying to bury the metals and lose the fishery, or lift the metals, sell them, and get the sea floor back.
Typical Project Economics
Cost that disappears
| Item | Value |
|—|—|
| Contaminated sediment disposal (conventional) | $50–400 per m³ |
| Reference case: Indiana Harbor | $80 million for 54,000 m³ |
| 1 km² at a 1 m sediment layer | ~1 million m³ → $50–400 million per km² in eliminated disposal cost alone |
Revenue from recovered products
| Product | Value |
|—|—|
| Metal salts | near $1,000 per tonne |
| Technical salt | $60–100 per tonne |
| Clean sand and clay | construction material |
| Fuel pellets (14 MJ/kg), oil cake | sold |
| Magnesium, bromine, lithium, potassium from pore water | exchange-traded, currently imported by Gulf states |
Saudi Arabia aggregate
| Item | Value |
|—|—|
| Brine processed | ~24 million m³/day ≈ 9 billion m³/year |
| Drinking water returned | ~9 billion m³/year — ~$6 billion at $0.7/m³ desalinated-water value |
| Salts and metals | ~$4 billion after discount |
| Recurring annual total | ~$10 billion/year |
| Five years of bottom processing, ~4,400 km² by 2030 | on the order of $50 billion cumulative, plus fisheries restored and liability retired |
The 2030 goal requires adding some 4 million m³ of water a day; processing brine yields up to 24 million m³ a day, so Arbok-DECOMP covers the desalination doubling several times over, with no new intakes, no new plants and none of their emissions.
Model: BOOM, fixed rate per tonne of contamination lifted and neutralised, zero client CAPEX; the exact rate per tonne is set per project during contract negotiation, based on site-specific sediment volume and composition.
Risk Factors
For 40 years the RO industry treated bottom contamination as someone else's problem or as no problem at all, so the primary obstacle is acknowledgement rather than physics — the source states plainly that the only thing still buried is the will to use the technology. The damage is invisible from the surface: no slick, no smell, which removes the public pressure that normally drives remediation spending. Brine is currently disposed of for free by discharge to sea, so the avoided-liability case rests on the counterfactual that sediment would be handled as the regulated toxic waste it resembles — not on a bill operators receive today. Contamination re-accumulates while the plant operates, so a single campaign does not close a site; service must be continuous. Every year of delay adds another layer of metals and chemistry on the bottom and loses raw material that must then be bought from someone else's monopoly. Left unchanged, the source projects the Persian Gulf's fate will not differ from the Dead Sea's.
Permitting for lifted-mass handling, offtake contracts for recovered metal salts, and site-specific sediment variability are established on a per-project basis during front-end engineering and are inherently site-dependent.
Related Technologies
Arbok Upwelling · Arbok-ZWD Gasification · ARBOK-Port-Sludge-Cleanup · ARBOK-MarineSludge · ARBOK LIGHT-SALT · ARBOK-BLACKSAND · Arbok-Potassium