Reverse Osmosis

Reverse osmosis (RO) is a water purification technology that uses membranes to remove salts and impurities from the seawater in order to create fresh water. Wärtsilä offers RO systems capable of producing between 40 and 1500 m3 of fresh water, daily. The system features a modular and flexible design and is customised to meet operational and space requirements of any vessel. This allows for installation and optimization of the RO system on all vessel types.  

The Wärtsilä reverse osmosis system utilizes a semi-permeable membrane: a porous sheet barrier that blocks the flow of salts and other solutes. Seawater is forced through microscopic pores in the membrane under pressure, while larger dissolved solids and heavy molecular weight contaminants are flushed away as reject water.

    Characteristics
    • Capacity 10 – 1500 t/d
    • Single and two pass design
    • Steady production of fresh water at a wide sea water temperature range between 0 - 35°C
    • Full-automatic or semi-automatic operation
    • Standard automation: Siemens S7-1500, Profinet or other by request
    • Easy connection to the Ship Automation and Control System
    • UV steriliser after prefiltration to reduce chemical consumption
    Advantages
    • Low energy consumption
    • Easy operation and maintenance
    • Flexible design according to the requirements and space
    • Different materials can be selected for components and piping
    • Modular design for retrofit projects and limited space
    • Suppliers of critical components can be selected (membranes, high pressure pumps, energy recovering devices, automation)
    • All proven suppliers from Western Europe and US
    • Support at design and installation stages
    • Less chemical consumption
    Spare parts and service

    Please send the vessel name, equipment type, serial number (if known), your company details and spares and/or service requirements to wsc.aftersales@wartsila.com and we will respond as soon as possible.

    Principles of operation

    Reverse Osmosis uses a semi-permeable membrane to remove salts and ions from seawater to provide fresh water. Semi-permeable membrane is a porous sheet barrier, which blocks the flow of salts and other solutes but allows only water to flow through.

    Seawater under pressure, is forced through microscopic pores in the membrane while larger dissolved solids and heavy molecular weight contaminants are continually flushed away as reject water.

    Main components

    1. Prefiltration (multimedia filters, self-cleaning filters, ultrafiltration)
    2. UV Sterliser
    3. High pressure pump
    4. Energy recovery system
    5. CIP/Automatic flushing system
    6. Reverse Osmosis Membranes

    Options

    1. Post-treatment (remineralisation)
    2. Remote monitoring system
    3. Flow transmitters: sea water, permeate, brine
    4. Super Duplex

    Related products

    Press releases

    Contact us

    Please fill in the form, we aim to respond within 1-2 business days depending on the enquiry. For an existing installation, provide all necessary details to identify the installation and the equipment. Fields indicated with an asterisk (*) are required. 

    Find your local Wärtsilä office here

    © 2021 Wärtsilä