TECHNOLOGY
The Variable Leverage Pump
A wave-energy-powered pressure source that drives reverse osmosis desalination — producing clean water continuously, without grid power or fuel.
HOW IT WORKS
From ocean wave to drinking water
The BlueDesal system harvests the mechanical energy in ocean waves and converts it directly into the high pressure required to push seawater through a reverse osmosis membrane — producing WHO-quality drinking water with no external power source.OceanWavesVariableLeveragePump (VLP)High-PressureSeawaterRO Membrane+ Post-treatmentPotable Water75,000 L/dayper moduleBrine discharge (managed)
1 — Wave capture
The Variable Leverage Pump is a nearshore or offshore device that uses the rise and fall of ocean waves as its mechanical input. Unlike turbine-based wave energy converters, the VLP uses leverage rather than rotation to generate high pressure directly, with fewer moving parts and no electrical generation step between wave energy and water pressure.
2 — Pressure generation
Wave motion drives the pump mechanism, producing the sustained high pressure (typically 55–80 bar for seawater) required to force seawater through a reverse osmosis membrane. Pressure output is designed to remain useful across a range of sea states, not only peak wave conditions.
3 — Reverse osmosis
Pressurised feedwater passes through a semi-permeable RO membrane. Salt, minerals, and microorganisms are rejected; purified permeate advances to post-treatment. The system uses industry-standard SWRO membrane elements, ensuring access to established replacement supply chains and quality-assured performance data.
4 — Post-treatment and delivery
Product water undergoes remineralisation, pH adjustment, and disinfection before delivery to the distribution network. Final water quality is designed to comply with WHO Drinking Water Guidelines and applicable national standards. A monitoring and control system logs water quality continuously.
SPECIFICATIONS
Module performance data
Each VLP module is a self-contained production unit. Multiple modules are deployed in arrays to reach required daily output. Energy consumption per m³, exact recovery rate, and full CAPEX/OPEX data are provided after site-specific engineering assessment. Contact us regarding a feasibility study.
| Parameter | Value | Notes |
|---|---|---|
| Output per module | 75,000 litres/day | Design figure; site-validated after wave resource assessment |
| Power source | Ocean wave energy | No grid connection or fuel required for water production |
| Desalination method | Seawater Reverse Osmosis (SWRO) | Industry-standard membrane technology |
| Operating availability | 24/7/365 | Including during grid power outages |
| Feedwater | Seawater (TDS 30,000–45,000 ppm typical) | Site-specific pre-treatment designed after water quality sampling |
| Product water quality | Designed to WHO Drinking Water Guidelines | Includes remineralisation and disinfection |
| Brine discharge | Concentrated brine | Dispersion designed per site-specific bathymetric and ecological study |
| Scalability | Modular — add units as capacity or financing allows | No minimum array size for first deployment |
SCALABILITY
From a single module to municipal-scale supply
Because each module is identical and independent, capacity scales linearly. The table below shows indicative module counts for common project sizes, before redundancy.
| Daily output target | Imperial gallons/day | Litres/day | Modules required (net) | Modules with N+1 redundancy |
|---|---|---|---|---|
| Small community / pilot | 0.1 IMGD | 454,600 L | 7 | 8 |
| Small coastal town | 0.5 IMGD | 2,273,000 L | 31 | 34 |
| Medium coastal town | 1.0 IMGD | 4,546,000 L | 61 | 67 |
| Regional supply | 3.0 IMGD | 13,638,000 L | 182 | ~200 |
Phased deployment
BlueDesal recommends a phased approach for large sites: begin with a demonstration array of 5–15 modules to validate site-specific performance, then expand to full capacity as wave resource data and operational experience accumulate. This reduces first-mover technical risk while demonstrating reliable production to financiers and offtakers.
RESILIENCE
Water security when the grid fails
Conventional grid-powered desalination plants stop producing water when the power grid fails — exactly when communities most need a reliable supply. BlueDesal’s wave-powered modules continue operating through power outages, grid instability, and fuel supply disruptions.
For remote coastal communities, small islands, and areas exposed to hurricanes and extreme weather, this resilience is not a feature — it is the primary requirement. BlueDesal was designed around it.
- No grid connection required for water production
- No diesel fuel storage or supply chain dependency
- Modular redundancy: no single-module failure halts the array
- Can be integrated with grid-tied components for monitoring and control without production dependency
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Hurricane and storm resilience
Module design accounts for storm conditions. During severe weather, modules can be secured in a protected configuration. Post-storm water production typically resumes as soon as wave conditions normalise — often before grid power is restored.
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Hybrid system integration
For monitoring, SCADA, and distribution pumping, BlueDesal modules can work alongside solar, battery, and grid backup systems. The wave energy conversion stage remains independent of these auxiliary power systems.