Horizon 2020 funding supports new bilge water treatment technology

Bilge water accumulates in the lowest compartments of every commercial vessel, and for decades the shipping industry has treated it as a necessary evil. Mixtures of fuel residues, lubricants, hydraulic fluids, cleaning solvents, and seawater slosh together in tanks that are difficult to empty safely, especially in busy ports. When discharged without adequate treatment, this oily wastewater threatens coastal ecosystems, fisheries, and the tourism economies that depend on clean harbours.

The European Union recognised the scale of this problem and, through its Horizon 2020 research and innovation programme, has been funding ambitious projects designed to rethink shipboard wastewater management. One of the most promising efforts is ElectroSAnMBR, a submerged anaerobic electrochemical membrane bioreactor that combines three treatment principles into a single compact system. The project brings together electrolysis, anaerobic digestion, and membrane filtration to break down oils, hydrocarbons, and dissolved chemical contaminants before the cleaned water leaves the vessel or reaches a port reception facility.

Australia sits at the receiving end of many of these discharges. With tens of thousands of commercial vessel movements each year passing through ports such as Sydney, Melbourne, Fremantle, and Dampier, the country has a direct interest in cleaner shipboard treatment. Vessels transiting the Torres Strait, operating near the Great Barrier Reef Marine Park, or calling at regional terminals in Western Australia all fall under Australian Maritime Safety Authority oversight. Stricter port state control inspections and tightening local pollution rules make advanced treatment technologies more attractive to operators servicing the Australian trade.

The broader context also matters. European shipowners exporting containerised goods, vehicles, and bulk commodities to Australian destinations already work within a regulatory landscape that mirrors the European Union's environmental standards. Bilge water that meets the highest treatment benchmarks is easier to discharge legally in multiple jurisdictions, which reduces operational friction for shipping companies. Horizon 2020 funding, therefore, is not just supporting a laboratory curiosity; it is shaping technology that will travel across oceans, including the Indian Ocean routes that connect European exporters to Australian consumers.

The bilge water challenge in global shipping

Modern ships generate hundreds of litres of bilge water every day, even on short coastal voyages. The composition of this stream is unpredictable, ranging from light fuel oils and lubricating grease to detergents used in engine room cleaning. Conventional oil-water separators, often paired with gravity settling tanks, perform adequately when the mixture is simple, but they struggle with emulsified oils and dissolved organic pollutants. Heavy weather, fuel transfer operations, and prolonged voyages only make the contamination more complex.

International rules set by the International Maritime Organization cap oil discharge at fifteen parts per million, but enforcement varies considerably between ports and flag states. Port state control inspectors in Australian harbours routinely test bilge discharges, and non-compliance can lead to detention, fines, and reputational damage for operators. Shipowners therefore look for systems that meet the letter of the rules and provide robust performance under challenging real-world conditions.

The cost of failing extends well beyond regulatory penalties. A single major spill near a sensitive marine environment can trigger compensation claims, salvage costs, and long-term monitoring obligations. Australian examples, including past incidents around Moreton Bay and Port Phillip Bay, have reinforced the value of prevention over response. Onboard treatment that consistently produces clean effluent is one of the most practical forms of insurance available to operators.

Inside the ElectroSAnMBR reactor design

The project takes a layered approach. Anaerobic digestion uses microorganisms that thrive without oxygen to break down organic matter into biogas, which can be captured and reused on board. Electrolysis applies a small electrical current across electrodes immersed in the wastewater, generating reactive species that oxidise stubborn hydrocarbons and disrupt emulsified oils. Finally, a submerged membrane bioreactor physically separates biomass and fine particles from the treated water, producing an effluent of very high clarity.

Because all three processes occur within a single reactor vessel, the system saves space, a critical factor on crowded engine room platforms. The integrated design also reduces the number of pumps, valves, and control loops that maintenance crews must manage. Researchers leading the work have published treating oily wastewater from ships: a technical overview of the ElectroSAnMBR project that walks through reactor geometry, electrode materials, and membrane specifications.

The team has reported strong performance against synthetic bilge mixtures in laboratory trials, with oil and grease removal rates above ninety-eight percent and significant reductions in chemical oxygen demand. These early results suggest the technology can meet the most stringent discharge standards currently in force, including the limits expected from upcoming European Union revisions to ship-source pollution rules.

Horizon 2020 funding and the European research framework

Horizon 2020 ran from 2014 to 2020 and distributed more than seventy billion euros across thousands of collaborative projects. Its successor programme, Horizon Europe, continues the tradition, with calls specifically targeting maritime decarbonisation, circular economy practices, and water reuse. ElectroSAnMBR sits within the legacy of this funding philosophy, drawing on cross-border consortia that link universities, research institutes, and industrial partners.

The financial support from Horizon 2020 covered equipment, personnel, pilot-scale testing, and the intellectual property protection that allows findings to be shared openly while preserving commercialisation rights. This kind of public investment lowers the risk for private companies that might otherwise hesitate to invest in unproven environmental technologies. Partners such as the AAE Europe association provide platforms for connecting research outputs with industrial adopters, policy makers, and naval architects across the continent.

The funding model also encourages transparency. Open access publications, public deliverables, and dedicated project websites allow regulators, port authorities, and shipping companies anywhere in the world to scrutinise the technology as it matures. Australian shipowners, naval designers, and environmental consultants can therefore follow the development trajectory without needing to be part of the original consortium.

What the technology means for Australian ports

Australian ports handle more than a billion tonnes of cargo annually, and the vessels that carry this freight depend on compliant bilge systems. Adoption of technologies like ElectroSAnMBR would help local operators stay ahead of tightening standards from the International Maritime Organization, the Australian Maritime Safety Authority, and state environmental agencies. It would also support the country's commitments under the London Protocol, which restricts the dumping of waste at sea.

There are domestic innovation opportunities as well. Australian engineering firms already supply specialised equipment to the offshore oil and gas industry in Bass Strait and the North West Shelf. With the right partnerships, local manufacturers could adapt the ElectroSAnMBR concept for harsh-environment vessels, including tugboats operating in tropical Queensland waters, fishing fleets based in Hobart, and naval support ships visiting regional bases.

Beyond compliance, the technology aligns with national narratives about clean oceans and reef protection. The Great Barrier Reef remains a powerful symbol of Australia's natural heritage, and any credible effort to reduce ship-source pollution strengthens the case for sustainable maritime trade. Fleet managers who invest in advanced treatment can use that commitment in customer communications, particularly when serving environmentally conscious cargo owners in Europe and Asia.

From pilot testing to commercial deployment

Scaling the technology from pilot to commercial production is the next significant hurdle. Engineers are working on long-term fouling behaviour of the submerged membranes, the durability of electrode materials in saline conditions, and the integration of biogas capture with existing vessel energy systems. Each of these challenges requires iterative testing on real bilge streams rather than laboratory substitutes.

The research consortium has signalled interest in expanding pilot installations to a wider range of vessel types, including chemical tankers, cruise ships, and offshore service vessels. Such trials would generate the operational data needed for classification society approval, which in turn unlocks commercial uptake. Australian shipyards, particularly those along the coasts of Western Australia and South Australia, could host demonstration projects that feed directly into the local maritime supply chain.

Education and training are equally important. Marine engineers, chief engineers, and engine room ratings need clear guidance on how to operate, maintain, and troubleshoot these advanced systems. The project is therefore investing in technical documentation, e-learning modules, and collaboration with maritime training institutions. As results emerge, they will help shape the next generation of environmentally responsible ship design.

Readers interested in following the progress of this work can subscribe to project updates, download public deliverables, and connect with the research team through the official ElectroSAnMBR channels. Engineers, port authorities, shipowners, and policy makers are invited to engage with the consortium, share operational feedback, and explore opportunities for pilot deployment. Collaborative input from Australian stakeholders will help ensure the technology meets the highest standards of performance, safety, and environmental care as it moves toward full commercial readiness.