Vom 25.-28. September 2019 trifft sich in Monaco wieder die Superyacht-Szene. Auch wir sind dabei – sie finden uns hier: Darse Sud Tent DS83. Wir freuen uns auf Ihren Besuch!
Das HAMANN-Team steht Ihnen gern für Ihre Fragen rund um die Abwasserbehandlung, die geltenden Regulierungen und passenden HAMANN-Anlagen zur Verfügung.

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by Dipl. Ing. Olaf Hansen, designated Head of Technical Department at HAMANN AG

During the last months, the industry of waste water and sewage treatment technology has seen some notable and partly confusing actions regarding the certification of products. Due to increasing pressure from both the industry and the legislative side, certificates for some sewage treatment plants on the market have been suspended or withdrawn by certifying bodies. This indicates that the certification system needs to be revised. A group of industry players – we are among them – has issued a call for action to improve the guidelines for the certification of sewage treatment plants.

Fortunately, it is the intention of many ship owners to reduce the environmental impact of their ships or just aiming to comply with existing regulations. As a matter of fact, these owners are exposed to a high financial risk when the sewage treatment systems on board do not comply with required effluent standards.

Public authorities around the world are getting more and more sensitive to marine pollution by sewage from ships. A recent example is the Maritime and Port Authority of Singapore (MPA Singapore) which has just issued a circular to all owners, managers and masters of Singapore-registered ships in which they point out that malfunctions of sewage treatment plants have been the most frequent reason for ships to be detained by Port State Control in the year 2019 so far.

If a certificate of an operating plant gets withdrawn because it does not meet the required effluent standards, the ship owner might be forced to have it replaced by another plant with a valid certificate and/or to pay a significant fine.

Considering this, we encourage all ship owners and shipyards to look beyond the certificates and to challenge us – the manufacturers – to deliver sewage treatment systems that perform in terms of effluent quality, ease of operation and reliability. We suggest to broaden the perspective and to take a look at what a sewage management system actually is – or should be.

Sewage management is more than just having a sewage treatment plant. A sewage management system needs to be designed properly from sewage collection via sludge handling to effluent discharge. Sewage treatment plants, black and grey water lines, grease separators, system separators preventing microbes from spreading against the flow from waste water lines into fresh water systems, holding tanks, tank aerations, transfer systems, sludge tanks, sludge processing facilities and performance monitoring are all part of the system. Off course, every project is different. Therefore a sewage management system has to be customized to cover the specific conditions on board.

There are a few key factors that influence how well a sewage treatment system performs. First and foremost, food waste and sewage lines strictly have to be separated. Food waste has a much higher BOD5 (Biological Oxygen Demand) value than raw sewage and therefore heavily increases the organic load on the sewage treatment plant. Grey water from galleys needs to run through a properly designed and dimensioned grease separator before being stored in a holding tank. Grease from galleys not only plugs up pipes and sensors, but also catalyzes the build-up process of hydrogen sulfide which is a toxic and extremely smelly gas inside the holding tanks. In the worst case, sulphuric acid may be formed inside the holding tanks which then attacks the piping and leads to a degradation of the effluent values.

Last but not least, the organic load of the sewage treatment plant should be monitored and controlled in order to maintain the organic design-load which was certified. For example, IMO resolution MEPC.227(64) requires a sewage treatment plant to produce the defined effluent values based on a TSS (Total Suspended Solids) value of ≥ 500 mg/l in the influent. Our sewage treatment plants are designed within these parameters but with a margin allowing for varying load situations. Operating the plant for a longer period above this margin leads to reduced treatment effectiveness and therefore a degradation of the effluent quality. In extreme cases, overloading can lead to a complete breakdown of the plant.

For us as a manufacturer it is evident that we cannot leave the planning and design of a sewage treatment system to the customers and just sell them sewage treatment plants. An important part of our business is consulting. The earlier we get involved in a project, the better the results can be. We often do workshops with ship design companies and naval architects before or at the very beginning of a project to improve the sewage management system as a whole. During the detail construction we closely work together with the shipyard engineers on creating the best possible conditions on board in order to operate our systems properly.

But even the best system is useless if operation and maintenance overtaxes the crew on board. It makes no sense to expect a ship’s crew to have expert knowledge in the field of sewage treatment like staff of most land based sewage treatment facilities have. Marine sewage treatment plants should be operated safely without years of prior training. We incorporate this aspect in the design of our systems and put a lot of effort in the automation of routine operations, high usability and low maintenance requirements. Only then, a well-designed sewage management system performs well.

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STELLA AUSTRALIS und VENTUS AUSTRALIS befahren für Australis Expeditions die Fjorde und Kanäle von Tierra del Fuego, Patagonien.

Das auf Luxus-Expeditionskreuzfahrten spezialisierte Unternehmen nimmt den Umweltschutz sehr ernst und hat HAMANN als Lieferant der Abwasserbehandlungstechnologie auf seinen Schiffen ausgewählt. Lesen Sie mehr über das Engagement für Umweltschutz und Nachhaltungskeit von Australis Expeditions hier:

Beide Schiffe wurden von ASENAV in Valdivia, Chile (VENTUS AUSTRALIS 2017, STELLA AUSTRALIS 2010) gebaut und sind jeweils mit HAMANN HL-CONT Plus 10 Abwasserbehandlungsanlagen entsprechend dem Standard IMO res. MEPC.227(64) ausgestattet.

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Die Nor-Shipping 2019 steht kurz vor der Eröffnung und das HAMANN team ist vor Ort, gemeinsam mit unseren norwegischen Partnern von TECHMARIN am Stand D06-40. Wir stellen eine HL-CONT PLus Abwasserbehandlungsanlage aus und freuen uns darauf, Ihre Fragen zu unserer Technologie und unseren Lösungen beantworten zu können. Kommen Sie vorbei – wir freuen uns auf Ihren Besuch!

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Wir freuen uns die neue HL-CONT Compact 0125 Abwasserbehandlungsanlage vorstellen zu können! Sie bietet eine Kapazität von 3.000 Liter/Tag in einem besonders kompakten und kostenoptimierten Paket. Weitere Informationen finden Sie hier.


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Vom 8. bis 11. April 2019 trifft sich die Kreuzfahrtbranche im Miami Beach Convention Center in Miami Beach, Florida USA, zur Seatrade Cruise Global. Wir stellen aus am Stand Nr. 1943, gemeinsam mit unseren Partnern FilWaTec Inc und M.A.C.E. Inc. Unser Team stellt Ihnen gerne das HAMANN portfolio für Kreuzfahrtschiffe vor, von Refit-Anlagen bis zu Turn-Key-Lösungen für Neubauten. Außerdem ist unser Agent und Service-Partner MSHS Motor Services Hugo Stamp vor Ort am Stand Nr. 1969. Wir und unsere Partner freuen uns auf Ihren Besuch!

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