G-Cav™ Environmental Remediation for Natural Water Treatment

1. Executive Summary

The degradation of water bodies — lakes, reservoirs, rivers, estuaries, wetlands — and the contamination of groundwater aquifers represent some of the most persistent and costly environmental challenges facing water managers, catchment authorities, and regulators worldwide. Conventional remediation approaches — chemical dosing, mechanical aeration, dredging, pump-and-treat groundwater systems — typically address symptoms rather than causes, require ongoing chemical inputs, and frequently impose their own environmental burden on the systems they are intended to restore.

G-Cav™ vortex-induced multistage hydrodynamic cavitation technology offers a fundamentally different approach: the delivery of biologically and chemically active gases — oxygen, molecular hydrogen, and ozone — as nanobubbles directly into the water body or aquifer, driving the natural geochemical and microbial processes that determine water quality without chemical addition. The platform operates across three distinct gas supplementation protocols, each addressing a specific remediation challenge, and can switch between gas types using the same installed unit.

This capability statement presents the scientific basis and application of each gas protocol, the specific environmental problems each addresses, the evidence base supporting the proposed mechanisms, and the pilot program design that would confirm performance in any specific site context. The following information is deliberately high level in order to maintain accuracy as we are looking to remediate some of the most significant water remediation challenges the world over. Although we cover a lot of ground here, this is not exhaustive and there will always be variables that need also to be considered.

2. The Three-Gas Remediation Platform

The G-Cav™ platform generates nanobubbles of whatever gas is supplied to the reactor. The cavitation mechanism — vortex-induced multistage implosion fragmenting injected gas into micro- and nanoscale bubble populations with enormous reactive surface area — is gas-independent. The choice of gas determines the biological and chemical outcome. For environmental remediation, three gases address three fundamentally different classes of problem, and the same submersible unit can be deployed for any of them.

3. Eutrophication: The Central Environmental Challenge

Eutrophication — the nutrient-driven degradation of water bodies — is the most widespread water quality problem affecting lakes, reservoirs, rivers, and estuaries globally. Excessive inputs of nitrogen and phosphorus from agricultural runoff, urban stormwater, and wastewater discharge fuel algal and cyanobacterial growth, which in turn drives oxygen depletion through decomposition, releasing further nutrients from sediments in a self-reinforcing cycle that is extraordinarily difficult to interrupt once established.

The self-reinforcing character of eutrophication is the critical challenge. Even after external nutrient inputs are controlled — which itself may take years or decades — the internal nutrient load stored in bottom sediments continues to fertilise the water body from within. A eutrophic lake essentially becomes its own nutrient source, releasing phosphorus and ammonium from the anoxic sediment-water interface into the water column, sustaining algal blooms long after the original pollution source has been addressed. Effective remediation must therefore address the internal load, not only the external inputs.

4. Oxygen Protocol

Phosphate Immobilisation and Nitrogen Cycle Restoration

4.1 Phosphate Immobilisation: The Iron Redox Gate

The relationship between sediment oxygen status and phosphorus release is one of the most thoroughly documented mechanisms in limnology. Under aerobic conditions at the sediment-water interface, phosphate is strongly bound to ferric iron (Fe³⁺) in insoluble iron-phosphate complexes. These complexes effectively seal phosphorus in the sediment, preventing its release into the overlying water column.

When the hypolimnion becomes anoxic — as occurs in stratified eutrophic lakes during summer, when biological oxygen demand from decomposing algal biomass exceeds the supply of oxygen from the surface — iron-reducing bacteria reduce Fe³⁺ to ferrous iron (Fe²⁺). Fe²⁺-phosphate complexes are soluble. The sediment releases phosphate directly into the water column in quantities that can dwarf the external nutrient load, providing an internal fertiliser pulse that fuels further algal growth regardless of what is happening in the catchment.

The treatment does not require mixing or destratification — which can itself cause problems by bringing nutrient-rich bottom water to the surface and triggering bloom events. The oxygen is delivered at depth while thermal stratification is maintained, selectively restoring the aerobic geochemistry at the sediment interface without disturbing the water column structure above.

4.2 Nitrogen Cycle Restoration: Nitrification and Coupled Denitrification

Nitrogen exists in water bodies in multiple oxidation states, of which ammonium (NH₄⁺) and nitrate (NO₃⁻) are the most ecologically significant. In a healthy, oxygenated water body, ammonium is converted to nitrate by nitrifying bacteria — a strictly aerobic process requiring dissolved oxygen. Nitrate is subsequently converted to dinitrogen gas (N₂) by denitrifying bacteria at the anoxic sediment interface — a process that permanently removes nitrogen from the system.

In a hypoxic water body, nitrification stalls. Ammonium accumulates in the water column and at the sediment surface, where it is both a direct nutrient for algal growth and, at elevated concentrations, toxic to fish and invertebrates. The nitrogen removal pathway — nitrification followed by coupled denitrification — is broken because the first step cannot proceed without oxygen.

G-Cav™ oxygen injection restores dissolved oxygen in the hypolimnion, enabling nitrifying bacteria to resume ammonium oxidation. Nitrate produced by nitrification then undergoes heterotrophic denitrification at the anoxic sediment interface — driven by sediment organic carbon — converting nitrate to N₂ gas and removing it from the system permanently. The net effect is a restoration of the complete nitrogen removal cycle from a single oxygen injection intervention.

4.3 Hydrogen Sulphide Elimination

Anoxic bottom waters and sediments in eutrophic systems accumulate hydrogen sulphide (H₂S) produced by sulphate-reducing bacteria metabolising organic matter in the absence of oxygen. H₂S is acutely toxic to fish and invertebrates at concentrations of a few micrograms per litre, produces the characteristic rotten-egg odour of degraded water bodies, and further suppresses nitrification by poisoning nitrifying bacteria.

4.4 Hypoxic Zone Restoration in Rivers and Estuaries

Agricultural drainage and urban runoff create seasonal hypoxic zones in rivers, estuaries, and coastal waters. In Australia, riverine hypoxia events — often called blackwater events — occur when organic matter from flooded vegetation is flushed into rivers, creating oxygen demand that drives DO to near-zero levels and causes mass fish kills across affected reaches. Similar seasonal hypoxic zones in estuaries receiving agricultural drainage are a major driver of benthic fauna loss and fishery decline in coastal systems globally.

The >99% Oxygen Transfer Efficiency of the G-Cav™ system — independent of water temperature — makes it significantly more effective than conventional surface aerators or diffuser arrays for DO restoration in flowing water bodies. In river systems where oxygen demand is high and flow is continuous, the ability to inject the full mass of supplied oxygen into solution in a single pass, at any depth, with no off-gassing loss, maximises the impact of each unit of oxygen supplied.

5. Hydrogen Protocol

Hydrogenotrophic Denitrification

Nitrate contamination of groundwater is one of the most widespread and persistent water quality problems in agricultural regions globally. Nitrate leaches readily from fertilised soils through the unsaturated zone into aquifers, where it accumulates over years to decades. In Australia, the United States, Europe, and China, nitrate concentrations in agricultural aquifers routinely exceed drinking water guidelines, creating both public health obligations and regulatory compliance costs for water utilities relying on groundwater sources.

5.1 Why Conventional Denitrification Fails in Groundwater

Conventional remediation responses — pump-and-treat systems that extract nitrate-contaminated groundwater, treat it at surface, and reinject — are energy-intensive, expensive, and address only the extracted fraction while the aquifer continues to receive recharge. Ex-situ treatment does not remediate the aquifer; it manages the symptom. In-situ biological denitrification — treating the aquifer where the contamination exists — is the only approach that can address the problem at its source.

5.2 Hydrogenotrophic Denitrification: Molecular Hydrogen as Electron Donor

Hydrogenotrophic denitrification uses molecular hydrogen (H₂) as the electron donor in place of organic carbon, enabling denitrifying bacteria to reduce nitrate to nitrogen gas even in carbon-limited environments:

This reaction is thermodynamically favourable and is carried out by a range of naturally occurring denitrifying bacteria — Paracoccus denitrificans being the most studied — that are widely distributed in aquifer environments. The organisms are already present; what they lack in carbon-limited aquifers is the electron donor. Supplying molecular hydrogen provides that electron donor without introducing organic carbon that could itself create secondary water quality problems.

The reaction produces hydroxide ions (OH⁻), which slightly raises the pH of the treated water — a generally benign effect in most groundwater contexts and a useful indicator of treatment progress. The nitrogen product — N₂ gas — is inert, non-toxic, and exits the aquifer naturally as dissolved gas that equilibrates with the atmosphere. There is no secondary waste stream, no sludge, and no chemical residue.

5.3 The G-Cav™ Delivery Advantage for Hydrogen in Porous Media

The physical constraint on in-situ groundwater treatment is the delivery radius: how far from the injection well can the treatment agent penetrate before being depleted by reaction with the aquifer matrix. This is the primary engineering challenge for any in-situ remediation technology, and it determines the number of injection wells required and therefore the capital cost of the system.

Molecular hydrogen has a natural water solubility of approximately 1.6 ppm at 20°C under atmospheric pressure — substantially lower than oxygen. In conventional dissolved H₂ injection systems, this low solubility limits the concentration deliverable and therefore the treatment radius per injection point. G-Cav™ nanobubble injection supersedes the solubility constraint: by delivering H₂ as a nanobubble population that dissolves instantaneously into the pore water at the point of injection, the system can deliver substantially higher effective H₂ concentrations than simple dissolution allows, extending the treatment radius and reducing the well density required for a given aquifer volume.

5.4 Application to Agricultural Drainage and Surface Water

Hydrogenotrophic denitrification is not limited to groundwater. Agricultural drainage channels, constructed wetlands receiving high-nitrate agricultural runoff, and tile drainage systems all present the same carbon-limited denitrification problem in a surface water context. Conventional treatment of agricultural drainage requires either constructed wetlands with sufficient organic carbon substrate or chemical dosing of carbon sources — both costly and operationally intensive at field scale.

G-Cav™ hydrogen nanobubble injection into drainage channels or wetland inlet structures provides the electron donor for in-situ denitrification by the indigenous bacterial community without organic carbon addition. The treatment occurs within the water body or drainage channel itself, with no ex-situ processing required. For catchment-scale nitrate management programs, this represents a potentially transformative reduction in treatment infrastructure cost compared to conventional constructed wetland or chemical dosing approaches.

5.5 On-Site Hydrogen Production: Electrolysis and the Oxygen Co-Product

A practical question for any hydrogenotrophic denitrification deployment is how molecular hydrogen is sourced on site. Compressed hydrogen cylinders are viable for pilot programs but are logistically demanding and costly at sustained field scale. Electrolysis — the electrochemical splitting of water into hydrogen and oxygen — offers a continuous, on-site H₂ production option that eliminates the cylinder supply chain and scales with electrical power availability.

Why Oxygen Must Be Separated from the Hydrogen Stream

Denitrifying bacteria — including the hydrogenotrophic species that drive the denitrification reaction — are facultative anaerobes. They can use either oxygen or nitrate as their terminal electron acceptor, but they strongly prefer oxygen because aerobic respiration yields substantially more free energy per mole of substrate. When dissolved oxygen is present, the genes encoding nitrate reductase and downstream denitrification enzymes are transcriptionally repressed. Denitrification stops.

The engineering solution is a membrane electrolyser — specifically a proton exchange membrane (PEM) electrolyser — which produces H₂ and O₂ on physically separated sides of the membrane and delivers them as independent gas streams. These units are commercially available, compact, and directly compatible with the G-Cav™ gas injection configuration. The two streams are simply routed to separate G-Cav™ units with separate treatment objectives.

The O₂ Co-Product Is an Asset, Not a Waste Stream

The more significant insight is that the oxygen co-product from electrolysis is not a nuisance to be vented — it is a productive input to a complementary treatment objective. In virtually every environmental context where hydrogenotrophic denitrification is needed, there is also a parallel need for oxygenation somewhere in the same system. A membrane electrolyser therefore feeds two G-Cav™ treatment streams simultaneously from a single power input:

Stratified lake or reservoir: H₂ injected via G-Cav™ into the anoxic hypolimnion for denitrification; O₂ injected via a second G-Cav™ unit at intermediate depth to maintain the aerobic zone, support nitrification, and keep phosphate immobilised at the sediment interface. The two treatments are spatially separated and mutually reinforcing — denitrification removes the nitrate that nitrification produces, closing the nitrogen removal cycle.

Groundwater system: H₂ injected downgradient into the nitrate-contaminated plume via one injection well; O₂ injected via a separate well to stimulate aerobic hydrocarbon biodegradation in an adjacent petroleum contamination zone. One electrolyser, two wells, two remediation objectives addressed in parallel.

Agricultural drainage channel: H₂ injected inline for denitrification of high-nitrate drainage flow; O₂ injected into a receiving dam or wetland to restore dissolved oxygen in water destined for irrigation or aquifer recharge.

Oxygen Inhibition Risk: A Site-Specific Assessment

The severity of oxygen inhibition of denitrification is site-dependent. In a deeply confined, geochemically isolated anoxic aquifer, any O₂ that inadvertently enters the treatment zone would be consumed almost instantaneously by chemical oxidation of reduced iron, manganese, and sulphide in the aquifer matrix — long before it could reach the denitrifying bacterial community. In this context, very tight gas stream separation is less critical as a practical matter, though it remains the correct engineering approach.

In partially oxygenated systems — shallow aquifers, rivers, constructed wetlands, drainage channels — background dissolved oxygen is already present at some level, and the denitrifying community has adapted to operate in micro-anoxic niches within the system. In these contexts, the additional O₂ from co-injected electrolysis gas would add to an already competing aerobic environment and more directly suppress denitrification. Gas stream separation is more important here, and careful monitoring of dissolved oxygen in the denitrification treatment zone is warranted.

6. Ozone Protocol

Algal Bloom Control and Surface Contamination

6.1 Cyanobacterial Bloom Control and Cyanotoxin Destruction

Cyanobacterial blooms — blue-green algae — represent the most acute water quality risk associated with eutrophication. Toxin-producing cyanobacterial species including Microcystis, Anabaena, and Cylindrospermopsis are responsible for the closure of drinking water reservoirs, recreational water bodies, and irrigation water sources across Australia and globally. Cyanotoxins — microcystins, cylindrospermopsins, saxitoxins — are hepatotoxic, neurotoxic, and in some cases carcinogenic at concentrations achievable in bloom conditions.

Conventional algal bloom management relies on copper sulphate or hydrogen peroxide dosing, both of which have environmental side effects and regulatory constraints in sensitive water bodies, or on physical removal that is effective only at the surface and cannot address subsurface populations in stratified blooms. Neither approach destroys cyanotoxins that have already been released into the water column.

Ozone is one of the most effective oxidants for both cyanobacterial cell destruction and cyanotoxin degradation. Ozone disrupts cyanobacterial cell membranes, causing lysis and bloom collapse, while simultaneously oxidising released cyanotoxins to non-toxic breakdown products. The G-Cav™ ozone nanobubble delivery provides two specific advantages over conventional ozone contact systems for this application.

Depth penetration: Cyanobacteria in stratified water bodies form subsurface maxima at the depth of the thermocline, where light and nutrient conditions are optimal. Surface-applied ozone or copper sulphate cannot reach these populations effectively. G-Cav™ ozone nanobubbles can be delivered at any depth via the submersible configuration, treating the bloom where it exists rather than only at the surface.

No chemical residue: Ozone decomposes to oxygen — the decomposition product is itself beneficial to the water body. Unlike copper sulphate, which accumulates in sediments and affects non-target organisms, ozone treatment leaves no persistent chemical residue. This makes G-Cav™ ozone treatment acceptable in drinking water catchments and ecologically sensitive water bodies where chemical algaecides are prohibited.

6.2 Surface Water Oil Contamination and Spill Response

Oil contamination of water bodies — from vessel spills, pipeline leaks, stormwater runoff from roads and industrial sites, or agricultural machinery — presents both acute toxicity and chronic habitat quality problems. Conventional spill response relies on mechanical skimming, chemical dispersants, or sorbent booms — all of which are logistically complex, expensive, and in the case of dispersants, environmentally problematic.

The G-Cav™ sub-micro flotation mechanism — identical to that demonstrated in produced water treatment at the Permian Basin — applies directly to surface water oil contamination. The submersible unit is deployed within the contaminated water body. Hydrodynamic cavitation simultaneously breaks oil-water emulsions and generates the nanobubble interfacial area that drives Gibbs adsorption concentration of surface-active compounds. Oil and associated hydrophobic contaminants concentrate in a skimmable surface foam without chemical addition. The treated water returns to the receiving environment with substantially reduced hydrocarbon loading, along with the benefit of being enriched with oxygen.

6.3 Organic Micropollutant Destruction

Emerging organic contaminants — pharmaceuticals, personal care products, pesticide metabolites, and industrial chemicals — are increasingly detected in surface water bodies receiving agricultural runoff, treated wastewater discharge, and urban stormwater. These compounds are generally resistant to biological degradation in the environment and accumulate in aquatic organisms. Many are endocrine-disrupting at very low concentrations.

Ozone is a highly effective oxidant for many organic micropollutants, attacking the aromatic rings, double bonds, and amine groups that characterise both the biological activity and the environmental persistence of these compounds. G-Cav™ ozone nanobubble treatment in affected water bodies provides an in-situ oxidative treatment option that requires no ex-situ processing, no chemical addition other than ozone, and leaves no persistent residue. The same submersible deployment configuration used for algal bloom control applies directly to micropollutant treatment.

7. Groundwater Remediation: In-Situ Gas Injection

Groundwater remediation presents the most challenging delivery problem in environmental treatment: the target is usually inaccessible, distributed through porous media over potentially large areas, and any treatment agent must be delivered through the aquifer pore system from injection wells. Conventional pump-and-treat systems extract contaminated water, treat it at surface, and reinject — addressing only the extracted fraction while the aquifer matrix continues to serve as a source. In-situ treatment — delivering the remediation agent directly into the aquifer — is the only approach that addresses the contamination at its source.

7.1 Oxygen for Petroleum Hydrocarbon Oxidation

Petroleum hydrocarbon contamination of groundwater — from leaking underground storage tanks, pipeline spills, and industrial site runoff — is one of the most common groundwater quality problems in developed countries. The primary natural attenuation mechanism for petroleum hydrocarbons in groundwater is aerobic biodegradation by hydrocarbon-oxidising bacteria, but this process is limited by the supply of dissolved oxygen in the aquifer, which is rapidly depleted in the vicinity of a hydrocarbon plume.

In-situ oxygen injection — biosparging — is a well-established remediation approach that delivers oxygen to oxygen-depleted aquifer zones to stimulate aerobic hydrocarbon biodegradation. G-Cav™ oxygen nanobubble injection provides substantially higher dissolved oxygen concentrations at the point of injection compared to conventional air or oxygen sparging, and the dissolved oxygen persists further from the injection point because there is no gas-phase bubble migration that depletes the supply before it reaches the contamination target.

7.2 The Nanobubble Dissolution Advantage in Porous Media

In conventional sparging, gas bubbles rise through the aquifer under buoyancy, following preferential flow pathways and bypassing lower-permeability zones where contamination may be concentrated. The treatment radius is limited by bubble migration patterns and rapid depletion at the bubble-water interface. G-Cav™ nanobubbles dissolve essentially instantaneously at the point of injection — the gas is transferred to dissolved form before any migration occurs — delivering elevated dissolved gas concentrations that then diffuse through the pore water by concentration gradient rather than by bubble buoyancy. This fundamental difference in transport mechanism means G-Cav™ injection can achieve more uniform distribution of dissolved oxygen or hydrogen through the aquifer matrix from a single injection point.

8. Deployment Configurations

G-Cav™ environmental remediation deployments fall into three physical configurations depending on the target environment. All configurations use the same reactor series; the configuration is determined by the site geometry and the depth of treatment required.

8.1 Submersible Deployment — Open Water Bodies

For lakes, reservoirs, ponds, wetlands, rivers, estuaries, and harbour environments, the G-Cav™ unit can be mounted on a submersible pump and lowered to the target treatment depth or boosted with a second pump to even deeper targets. The gas of choice is drawn into the cavitation chamber by the negative pressure zone within the vortex — and depending on actual depths and engineering parameters at play, no or virtually no external gas compression is required. The treated water, loaded with the nanobubble gas population, can be discharged at depth, and the dissolved gas distributes through the water column by diffusion and water movement. The unit can be repositioned within the water body to target specific zones — thermocline depth for phosphate treatment, surface for algal bloom control, bottom for H₂S oxidation.

8.2 Inline Injection — Rivers, Drainage Channels, and Constructed Wetlands

For flowing water systems, G-Cav™ units can be installed inline on the flow channel, or by utilising a side stream manifold, treating the full water volume as it passes through. Multiple units in parallel can accommodate higher flow rates. For hydrogen denitrification in drainage channels, a series of injection points along the channel provides progressively deeper treatment as the water travels downstream. This configuration is well-suited to catchment-scale nitrate management programs where treating the drainage flow before it reaches a receiving water body is the objective.

8.3 Injection Well System — Groundwater

For groundwater remediation, G-Cav™ units are installed at the surface on pump circuits connected to standard injection wells. Water from the aquifer is pumped to the surface, passed through the G-Cav™ unit with gas injection, and reinjected into the aquifer at the desired treatment depth. The dissolved gas plume distributes through the aquifer pore water by diffusion and advection from the injection point. Multiple injection wells in a network provide coverage across larger contaminated zones. This configuration is directly compatible with existing pump-and-treat infrastructure, often allowing G-Cav™ units to be retrofitted to existing reinjection systems.

9. Evidence Base and Case Studies

9.1 Oxygen Transfer Performance — Laboratory Validated

The G-Cav™ oxygen transfer efficiency has been validated in controlled laboratory testing at two water temperatures directly relevant to warm-climate environmental applications. In a single pass of a 1,000-litre test volume, the system achieved instantaneous DO gains of 26 mg/L at 21°C and 18 mg/L at 31°C, with oxygen transfer efficiency exceeding 99% at both temperatures. Transfer efficiency was completely independent of water temperature — a critical advantage for tropical and subtropical environmental applications where water temperature varies seasonally and conventional aeration loses efficiency at higher temperatures.

9.2 Oil-Water Separation — Permian Basin Field Validation

Field testing on produced water from the Permian Basin demonstrated 65% Total Oil and Grease removal in a single pass, without chemical addition, using a submersible pump feeding a G-Cav™ reactor with nitrogen injection — a configuration directly analogous to the submersible environmental deployment. Visual confirmation of the surface separation mechanism was immediate and unambiguous. This result provides a validated performance floor for the oil spill response and surface water contamination applications described in Section 6.2.

9.3 Dubai Canal Environmental Remediation Opportunity — Proposal

[To be inserted: Dubai Canal environmental remediation case study data and outcomes. This case study represents a significant field validation of G-Cav™ performance in a high-profile environmental remediation context and should be incorporated into this section when the data is available for release.]

9.4 Literature Support for Proposed Mechanisms

10. Recommended Pilot Program Frameworks

Each remediation application requires a pilot program tailored to the specific site conditions, contaminant profile, and water body type. The following frameworks provide a starting structure for each application class.

10.1 Eutrophic Lake or Reservoir — Oxygen Protocol

Baseline: Pre-treatment profiling of DO, temperature, pH, phosphate, ammonium, nitrate, and H₂S at multiple depths throughout the stratification season

Treatment: G-Cav™ submersible deployment at hypolimnion depth — targeting the sediment-water interface DO maintenance

Monitoring: Weekly depth profiles of all baseline parameters; sediment core analysis pre- and post-treatment for iron speciation and phosphorus fractionation; continuous DO logging at treatment depth

Duration: Minimum one full stratification season (approximately 5–6 months in temperate climates, year-round in tropical systems)

Success indicators: Reduced hypolimnetic phosphate concentration; reduced internal P loading; improved nitrification rate; reduced H₂S

10.2 Nitrate-Contaminated Groundwater — Hydrogen Protocol

Baseline: Aquifer characterisation including nitrate concentration distribution, hydraulic conductivity, pH, dissolved oxygen, organic carbon content, and indigenous denitrifying bacteria population

Treatment: G-Cav™ hydrogen nanobubble injection via injection well at pilot scale — single injection point with monitoring well array to define treatment radius

Monitoring: Weekly groundwater sampling from monitoring wells at 1, 2, 5, and 10 metre radii from injection point; analysis for nitrate, nitrite, N₂ (dissolved), H₂, pH, and microbial community composition

Duration: Minimum 6 months to assess treatment radius and denitrification rate under stable injection conditions

Success indicators: Measurable nitrate reduction in monitoring wells; dissolved N₂ elevation confirming biological denitrification; pH increase consistent with OH⁻ production

10.3 Algal Bloom — Ozone Protocol

Baseline: Cyanobacterial cell density, species composition, cyanotoxin concentration (ELISA for microcystins, cylindrospermopsins), chlorophyll-a, turbidity, and dissolved oxygen profiles

Treatment: G-Cav™ submersible ozone deployment at bloom maximum depth — treatment applied during active bloom period

Monitoring: Twice-weekly sampling during treatment for all baseline parameters; ozone residual measurement to confirm decomposition before discharge

Duration: Treatment of one full bloom event; assessment at 24, 48, and 72 hours post-treatment initiation

Success indicators: Cell density reduction; cyanotoxin concentration below guideline values; DO improvement; no detectable ozone residual in treated water

10.4 Dual-Gas Electrolyser Platform — Combined Nitrogen Removal and Oxygenation

For sites where both denitrification and oxygenation are needed simultaneously — the most common eutrophication remediation scenario — a pilot specifically designed to evaluate the dual-gas electrolyser platform provides the most comprehensive dataset for full-scale investment decisions.

Baseline: Full water quality depth profile for the target water body: DO, nitrate, nitrite, ammonium, phosphate, pH, H₂S, and temperature at weekly intervals through one stratification cycle prior to treatment

Equipment: One PEM membrane electrolyser sized to power budget; two G-Cav™ submersible units — one receiving H₂ stream deployed at hypolimnion depth, one receiving O₂ stream deployed at mid-water or thermocline depth

Gas stream verification: Confirm complete separation of H₂ and O₂ streams; measure dissolved O₂ in denitrification treatment zone — must confirm anoxic conditions are maintained throughout H₂ injection period

Monitoring: Weekly depth profiles of all baseline parameters; dissolved H₂ in hypolimnion treatment zone; dissolved N₂ elevation as denitrification confirmation; sediment iron speciation and phosphorus fractionation at treatment start, mid-point, and end

Duration: Minimum one full stratification season; electrolyser power consumption metered continuously to calculate cost per kg of nitrate removed and per mg/L of DO restored

Success indicators: Nitrate reduction in hypolimnion; dissolved N₂ elevation confirming biological denitrification; phosphate immobilisation at sediment interface; DO maintained in aerobic zone; H₂S reduction; pH increase in treatment zone consistent with OH⁻ production from denitrification reaction

Economic output: Cost per kg N removed; cost per m³ DO restored; comparison with equivalent chemical dosing or constructed wetland approach for the same catchment nitrate load

11. About Global Cavitation Group Holdings

Global Cavitation Group Holdings Pty Ltd is an Australian technology company headquartered in Cairns, Queensland. The G-Cav™ vortex-induced multistage hydrodynamic cavitation platform is a patented system with field-validated performance across produced water treatment in the Permian Basin (65% TOG removal, single pass), biogas enhancement (190% methane production increase), and environmental remediation applications including the Dubai Canal project.

The company works with environmental regulators, catchment authorities, water utilities, mining operators, and environmental consultants to design and execute structured remediation programs. Global Cavitation welcomes engagement with any organisation facing water quality challenges in the categories described in this document.

Technical Note on Evidence Status

This capability statement presents environmental remediation applications of G-Cav™ nanobubble technology across three gas protocols. Oxygen transfer performance is laboratory-validated at >99% OTE. Oil-water separation performance is field-validated at the Permian Basin. The geochemical and biochemical mechanisms underlying phosphate immobilisation, nitrification-denitrification coupling, and ozone-mediated algal control are established in peer-reviewed limnological and environmental literature and are not G-Cav™-specific claims. Hydrogenotrophic denitrification via hydrogen nanobubble injection, nanobubble delivery advantage in porous media aquifer systems, and organic micropollutant destruction via ozone nanobubbles are mechanistically well-supported but have not yet been directly measured in G-Cav™ field trials. Sections identified as HYPOTHESIS / PILOT OPPORTUNITY present proposed applications awaiting field validation. Global Cavitation Group Holdings presents this document to invite rigorous scientific and engineering evaluation.