Marinfloc combined EGR bleed off and Bilge water treatment

Handling wastewater and staying environmentally compliant is an ongoing challenge for ship owners and crew members. Dealing with separate waste streams like EGR bleed off and bilge water from different MEPC annexes requires a deep understanding of procedures, adding to the onboard workload. The time and effort needed for separate waste management can take away from other tasks and create stress about non-compliance risks and potential fines. Balancing waste water treatment with a vessel's efficiency and sustainability can be tough.

Marinfloc's combined system, designed for MAN Energy Solutions' two-stroke engines with EGR technology, greatly improves the situation for crew members by merging the two waste streams. As the first-ever class-approved (DNV) separator for handling two different types of water, this comprehensive two-in-one solution simplifies waste management, streamlines operations, and ensures environmental compliance.

The system's main advantage is its state-of-the-art separator that streamlines both EGR bleed off and bilge water management. This integration not only simplifies compliance but also reduces the burden of handling multiple waste streams. Crew members can then focus on core tasks while being confident in the vessel's environmental performance. Plus, the significant reduction in operational (OPEX) and capital (CAPEX) expenses is a welcome bonus.



System description

Two waste streams - no problem

Marinfloc combined system is  engineered to effectively manage waste streams from both EGR Bleed off tanks and Bilge water holding tanks in a controlled and precise manner. The system Utilizing three integrated three-way valves so that operators can select the specific media to be treated, maintaining strict separation of waste streams and preventing cross-contamination.

In order to maintain accurate record-keeping and ensure compliance with environmental regulations, the system diligently records the treatment of each waste stream. This data enables the proper completion of both the Oil Record Book and the EGR Record Book, demonstrating the vessel's commitment to responsible waste management and adherence to environmental standards.

Initial separation

The EGR bleed off water undergoes an initial treatment phase in a cascade-type drain tank designed to separate as much soot as possible before reaching the main separator unit. This tank's design is subject to Marinfloc's approval, ensuring optimal performance and effectiveness. To enhance the separation process, the tank is equipped with heating coils that maintain the bleed off water temperature between 40-55°C. Furthermore, the inclusion of solid sensors is highly recommended to detect the solidification of soot, enabling timely intervention to prevent potential system issues.

Reliable technique

At a predetermined level, the treatment process commences. A pump is employed to transfer the bleed-off water to the separator (CD) unit. Similar to most land-based wastewater treatment systems, the CD unit harnesses the power of flocculation to eliminate emulsified oil, chemicals, particles, and other residual contaminants from the water.

The core of the treatment process, flocculation, employs chemicals to break emulsions and cause contaminants to come out of suspension, forming so-called flocs. The system utilizes two specific chemicals for this purpose: a coagulant and a flocbooster. The typical dosage is approximately 0.3-0.4 liters per ton of bilge water.

The flocs are separated from the water through forced flotation within the flocculation tank and removed via a drain pump in the tank's upper section. The water is then channeled through a cascade to the filtration system for further treatment. However, it is important to note that 99% of all contaminants are removed during the flocculation stage.

Although the water is considerably purified following the flocculation tank process, it may still exhibit slight discoloration or turbidity. To ensure an effluent with less than 5 PPM, the system employs three filtration stages. The first filter stage contains Aqualite, while the second and third filters are filled with activated carbon. Due to the highly purified state of the water after the flocculation step, the filter media enjoy an extended lifespan, and the filters undergo automatic backwashing.

The water is treated to a level below 15 PPM and discharged after undergoing oil content analysis by an MEPC.107(49) approved oil content meter. This highly professional and efficient system ensures optimal wastewater treatment and compliance with environmental standards.


Upon completion of the waste treatment process, the treated waste water is discharged overboard through a Whitebox® system. This solution records and logs all vital system data, including tank levels, valve positions, oil content, discharged volume, and more. This comprehensive data collection ensures transparency, regulatory compliance, and easy access to essential information for auditing and maintenance purposes.


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pdf Product catalogue EGR (3.52 MB)


Stakeholder values

Ship yard

Ship owners

 Engine makers

Space optimization: The 2-in-1 solution requires less space compared to two separate systems, providing an opportunity for shipyards to optimize the layout and design of the vessel, which can lead to additional benefits such as improved cargo capacity or more efficient use of available space. Lower operational expenditures:  Our combined treatment system is designed to minimize  operational expenses, making it a cost-effective choice for modern ship operations. Competitive advantage: By integrating the Marinfloc combined system into their offerings, engine makers can differentiate themselves from competitors, showcasing their commitment to innovative, efficient, and environmentally friendly solutions.
Reduced installation requirements: With a single integrated unit, shipyards have one less system to install, simplifying the process and saving valuable time and resources during the construction or retrofitting phase.  Simplified waste management: By combining two waste streams from different MEPC annexes into a single, integrated system, it reduces the complexity of handling various types of waste water. This simplification makes it easier for crew members to follow the proper procedures for waste treatment and disposal, ensuring compliance with environmental regulations. Lower power consumption: The Marinfloc system boasts significantly lower power consumption compared to alternative treatment techniques, providing cost savings and improving overall energy efficiency for the vessel.
Lower commissioning: With our combined system, we streamline the commissioning process by consolidating two separate waste streams into one, effectively reducing the need for commissioner engineers to attend and travel. This translates into significant cost savings for our clients, without compromising the effectiveness and reliability of our systems. Efficient and effective treatment: The state-of-the-art separator and two-in-one solution enable optimal treatment of both EGR bleed off and bilge water. This ensures that the discharged waste water meets or exceeds the required environmental standards, reducing the risk of non-compliance and potential fines or penalties as the Whitebox is included in the scope of supply as standard.  Continuous operation: The unit is designed for continuous use, eliminating the challenges associated with equipment standstill. This ensures consistent performance and reduces the risk of downtime, which can be costly and disruptive.
Cost savings from purchasing a single separator: The most notable benefit for shipyards is the need to purchase only one separator instead of two, leading to significant capital expenditure (CAPEX) savings. This directly impacts the overall project budget, making it more cost-effective and appealing to ship owners. Streamlined operations: The integrated system allows for more efficient waste management processes, reducing the time and effort required by crew members to handle waste water. With a more streamlined approach, crew members can focus on other essential tasks while remaining confident that their vessel is in compliance with environmental regulations. Space optimization: With a 2-in-1 integrated solution, more space is available onboard, allowing engine makers to optimize their designs and create more efficient, streamlined engine rooms or allocate the extra space for other purposes.
Less documentation: The documentation process is simplified, as there is only one system to cover, resulting in lower overall costs. Less drawings and simplified system design. Enhanced monitoring and control: The advanced technology of the Marinfloc application may also include features for real-time monitoring and control of waste water treatment processes. This allows crew members to quickly identify and address any potential issues, ensuring that the system remains compliant and operates at peak efficiency. Simplified training, service, and spare parts: The combined system reduces the need for extensive training, as there is only one integrated system to learn and operate. Additionally, service requirements and spare parts inventory are simplified, as the system uses a unified set of components, leading to more efficient servicing and lower operational expenditure (OPEX).