Based on known technology from land based Diesel Particulate Filters, silicon carbide filter configurations can be built both for emission applications and for liquid filtration purposes.
The silicon carbide filters are built for harsh operation environments unsuitable for conventional polymeric membrane products. A variety of different membranes can be applied to the carrier, depending on the final application.
In the marine sector these are the areas where our filters can be built and applied:
Other filter systems, already used in such applications can be replaced with liquid filters based on our silicon carbide carriers, typically for micro filtration and ultra filtration applications providing superior performance in a range of applications.
The benefit of silicon carbide filters, based on our carriers compared to oxide based liquid filters, is the extended operating and cleaning range (0-14 pH), and improved thermal shock resistance. These features enable treatment of aggressive alkaline fluids and cleaning operations with aggressive alkaline cleaners or rapid and aggressive thermal cleaning.
Typical use are applications for de-oiling of bilge water as well as many other marine related areas such as ballast water, wastewater and other areas where our filter substrates can be used.
Environment and Marine Operations Hand in Hand
United Nations International Maritime Organization (IMO) with its 169 mem-bers has a clear vision to reduce envi-ronmental impacts from ships. The ma-rine industry has acknowledged this and there is a clear commitment to deal with the issues.
Some technologies are in their infancy, however it is clear that in the years to come new solutions and applications will come in to operation.
At Notox Ceramic Filters we wish to par-ticipate in and contribute to this devel-opment by offering filter options already proven on land and now to be applied at sea.
Filter Solutions Ready for Ships and Waterways
Based on known technology from land based Diesel Particulate Filters and wa-ter filters, silicon carbide filter configura-tions can be built both for emission ap-plications and for liquid filtration pur-poses.
The silicon carbide filters are built for challenging and harsh liquid filtration operational environments unsuitable for conventional polymeric membrane prod-ucts. A variety of different membranes can be applied to the carrier, depending on the final application.
The main challenge of dealing with particulate matter pollution from ships is the sulphur content of the heavy fuel oil used in many large ship engines. From 1 January 2010 all ships using ports within the EU will be required to use low-sulphur fuel of less than 0.1%. Such restric-tions are also being put in place in many Emission Control Areas (ECA) around the world.
R-SiC filters can be used for en-gines powered with low sulphur content. As we se the regulations coming into force we are certain that filter applications will be de-manded even for the biggest ships.
When it comes to smaller ships and boats it is already possible to inte-grate a particulate filter in the emission systems since operational conditions are similar to those of heavy duty trucks. In fact R-SiC filter systems have already been installed on harbor boat and on smaller ship operating on inland water ways.
Many ships are highly dependant on the additional power generation capacity they have on board. In particular this is the case when the ship is in the harbor area and/or berthed close to large cities and low emission zones where emission restrictions are tougher. R-SiC filter systems are already being used extensively for land based applications, and it is possible to adopt the identical solutions to gensets in-stalled on ships.
The main challenge will be the di-mensions and physical space re-quirements of the system. This re-quires forward thinking when de-signing and building new ships to ensure proper integration. Also ret-rofitting a system will be feasible in most cases.
The regulations guiding the hand-ling and treatment of bilge water and especially oily waste water from the treatment system requires the need for filtration.
With R-SiC filter technology it is possible to take the bilge separator technology to the next level and allow for the discharge of clean water overboard or for recycling on the ship in clean water systems and drains such as cooling systems, boiler water and even utility water.
R-SiC filters are already being used for deoiling and silica removal from oilfield produced water and have demonstrated durability and resis-tance in very hostile applications.
IMO has adopted standards to be implemented successively depend-ing on how old the ship is. All new ships from 2012 must comply. Cur-rent systems embrace mechanical, physical and chemical treatment of the ballast water.
Introducing R-SiC based cross flow filtration offers a higher efficiency making supplementary treatment of the water unnecessary. This tech-nology will also allow for considera-bly higher flow rates compared to for instance traditional polymeric membrane filters. R-SiC filters will also give significant benefits in terms of ruggedness and resistance to tough working conditions.
The MARPOL Annex IV requires ships to be equipped with either a sewage treatment plant, a sewage comminuting (“reducing to minute particles”) and disinfecting system, or a sewage holding tank. Dischar-ge of sewage is allowed when the ship is discharging comminuted and disinfected sewage, using an ap-proved system, at a distance of more than three nautical miles from the nearest coast line, or sewage which is not disinfected at a distan-ce of more than twelve nautical miles from the nearest land.
With R-SiC filter technology it is possible to filter waste water, to a level which exceeds the current IMO standard by far.