The ACO Marine Maripur Membrane Bio Reactor

The ACO Marine Maripur has the highest standard of wastewater treatment plants for all marine applications and has been designed to treat all wastewaters (black and grey water) in one reactor. This reduces the need for more costly, heavier and larger alternative solutions.

Servac are an approved distributor for ACO Marine products

Aco marine logo


Retrofit options

Single unit treats both grey water and black water

Simple automated system

High quality AISI 316L stainless steel

This system is Type Approved to IMO MEPC 227(64) including the section 4.2. and EC MED Module B by Bureau Veritas. The compact process enables limited space on ships and other marine structures to be used more efficiently. There is a combination of a biological process with ultra-filtration which means there is no need for final clarification or additional disinfection (e.g. chlorination and/or UV filtration). Maripur kit meets and exceeds the quality standards of IMO/MARPOL, HELCOM, USCG, US CFR40.133, Australian ADNOC and Australian Federal Environmental Agency and the Alaska requirement.

ACO Maripur is manufactured using only high quality AISI 316L stainless steel and requires minimal operator intervention and maintenance. Other wastewater transfer pumps and vacuum collecting systems can be shelf mounted onto ACO Maripur body.

How the ACO Marine Maripur works

The wastewater passes into bioreactor where biological purification of the sewage water by activated sludge, a mixture of a number of micro-organisms, occurs.

The process is an aerobic one where the oxygen for respiration of the activated sludge must be delivered into the tank. The blowers continuously deliver air into the system which is then distributed into the bioreactor via the aeration elements. This air, whilst serving to keep the filtration modules clean, also ensures delivery of the required amount of oxygen to the micro-organisms within the process. Simultaneously the volume of the bioreactor is mixed to ensure the contact of sewage water with the activated sludge.

The first stage is continuously re-circulated to the membrane compartment by means of the recirculation pump. This membrane compartment maintains a constant level by overflowing back into the first stage compartment.

This feature allows for much greater flexibility during maintenance where it is no longer necessary to discharge the entire contents of the tank for internal access. The purified water is separated from the activation sludge by means of filtration modules. The filtration modules create safe, physical, barriers for the activation sludge, bacteria and some viruses. As a result, the filtered water does not need to be further disinfected.

The purified water is removed under a small vacuum created on the clean side of the filtration elements by the progressive cavity filtrate/permeate discharge pump with frequency converter.

The filtration modules are continuously cleaned to prevent fouling by the activated sludge. This is achieved by locating the aeration elements uniformly under the filtration modules. An integrated cleaning chamber is included in the main stainless steel tank for periodic membrane cleaning (using the reversible permeate discharge pump). This applies to ACO Maripur 100+. Smaller sizes are cleaned by externally prepared cleaning agent.

The amount of sludge in the bioreactor increases during operation. The sludge concentration design value is in the range 10-12,000 mg/l. The sludge concentration is controlled by means of a timer function on the effluent pump after a pre-programmed number of running hours. If the biological loading per litre is equal for all compliment conditions this feature will control concentration very simply and effectively. The surplus sludge is discharged periodically from the second chamber by the re-circulation pump.

During operation some foaming may occur on the surface level of the bioreactor. This is suppressed by the integrated anti-foam dosing system.

ACO Marine Maripur Wastewater treatment diagram Maripur

Dimensions and design

The ACO Maripur was developed as a modular system of seven nominal sizes from 25 to 250. Servac can offer bespoke solutions to markets such as Cruise, Military, Megayacht and Offshore.

Dimensions of the Maripur Wastewater Unit

ACO Maripur Load and Dimension Table