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Ultraviolet Sterilisation

UV-system: a reliable and comfortable way to sterilize potable water onboard ships or offshore.

Sterilisation of potable water by UV radiation is a safe and reliable alternative to other methods such as chlorination and is also used as final polishing before distribution / prior to consumption. The radiation causes photochemical reactions in the cells of micro-organisms, thus inhibiting essential cell functions. UV radiation is most suitable for sterilisation as an exposure to UV-C radiation kills up to 99.9 % of the bacteria and viruses.

RWO's UV units consist of a reaction chamber with the UV lamp and a separate control cabinet. The reaction chamber ist constructed of gun metal and stainless steel. The UV lamps, which emit over 90 % of the total UV emission at the optimum wave length of 254 nm, are fitted into the reaction chamber and protected by a UV transparant quarz glass.

• no chemicals required
• no effects on taste and odour
• no corrosion problems
• safe disinfection of drinking water
• easy to operate and maintain

Mineralisation and De-Acidification

A post-treatment of desalinted water from evaporators or RO units is absolutely necessary to get healthy, potable water. The mineralisation and de-acidification process inside the RWO mineralising units serves to establish and maintain corrosion inhabiting properties and slightly increases the hardness. The application of a mineralising unit has advantages for crew and passengers, as well as for the equipment material for distribution, storage and consumers such as air-conditions, ice makers, heating systems, etc.

• water becomes potable and a considerable improvement of taste and odour
• water becomes more healthy
• corrosion in the pipes and storage tanks is avoided, solution of poisonous heavy metals from the pipe surface in the water is prevented
• ship equipment is protected against corrosion and subsequent damages

Chemical Dosing Units for Water Treatment

Dosing Units on Board:

Fresh water and service water on board of ships are necessarily taken from various sources. To compensate the varying water quality the water has to be treated with chemicals.

With RWO dosing units you can easily and reliably condition the water to serve the intended use and to meet the technical requirements. The field of applictions includes the dosing of:

• Acids for alkalinity reduction and scale prevention
• Polyelctrolytes for coagulation of suspended solids and an improved subsequent filtration
• Scale inhibitors to avoid scale deposits on reverse osmosis membranes
• Disinfectants for shock treatment in order to avoid bacterial growth
• Chlorine to avoid biological growth in pipes and storage tanks
• Hydrated lime or caustic soda for pH adjustment to neuralize dissolved free carbon dioxide

RWO dosing units feature solenoid driven disphragm guarantees durability and dosing accuracy. All parts in contact with media are chosen for their resistance against the standard chemicals used for water treatment.

The control of the pump allows a continous adjustment of injection volume and frequency. These guarantees an adaptation to the dosing characteristics of the dosing agents.

Advantages:

• high dosing accuracy
• local control for adjustment of dosing rate
• integral dosing head deaeration for degasing of chemiacals
• easy installation and maintance
• high operational reliability
• high quality materials
• accessories in great variety

Accessories:

• automatic control units for dosing units
• water meters for in-line installation, generating the timing pulse which is necessary for flow controlled dosing rates
• a range of containers of different sizes for dosing chemicals
• handoperated mixers or motor driven mixers with timer and protection against dry running
• level switches for low level alarms and dry-running alarm
• external failure signal