Sewage treatment plants for ships

Sewage treatment plants (STPs) from Wärtsilä are the most cost-effective and safe answer for every ship or offshore platform to dispose of wastewater at sea. No tempering with the quality of our oceans.

Wärtsilä sewage treatment units - also known as 'Hamworthy Sewage Treatment Plants' - are certified to meet IMO MEPC 227(64) guidelines. These have been in place for all new-build ships from 1 January 2016 onward.

Each Wärtsilä/Hamworthy sewage treatment unit has been optimised to process all onboard black and grey wastewater streams. The plants are compatible with both conventional gravity and vacuum fed collection systems. On top of that, each STP is fully automatic, allowing for unattended operation. This greatly reduces maintenance requirements and lower long-term operating costs.

Finally, Wärtsilä sewage treatment plants for ships are compact and modular in design, suitable for between-deck installations and adaptable to customer new-build specifications.

    KEY BENEFITS

    Benefits of Wärtsilä sewage treatment plants

    • Cost-effective, environmental friendly & safe answer for every ship to dispose of waste water at sea
    • Proven effluent quality: clean and safe effluent, suitable for discharging overboard
    • Low operational costs with:
      • minimal maintenance & spare parts required
      • minimal human intervention during operation
    • Simple & robust construction
    • Compatible with gravity & vacuum collection systems
    • Collecting tank integral part of STP

    FEATURES

    Main features

    • IMO 227(64) & MED certified
    • Single power supply input point
    • Solids handling centrifugal discharge pump
    • Chemical disinfection and de-chlorination
    • Automatic control
    • Compact design

    MODELS

    STC 13 line

    System IMO certified
    (litres/day)
    Dimensions
    (LxWxH in mm)
    Weight full
    (kg) 
    STC-01-13 1740 1890 1400 1181 1550
    STC-02-13 3120 2518 1863 1336 3030
    STC-03-13 4660 2622 1863 1681 3959
    STC-04-13 6010 2722 2080 1821 5027
    STC-06-13 9360 3072 2280 1971 7367

    STC 14 line

    System IMO certified
    (litres/day)
    Dimensions
    (LxWxH in mm)
    Weight full
    (kg) 
    STC-08-14 11840 3000 2670 2000 9294
    STC-10-14 15810 3400 2750 2000 11314
    STC-13-14 20830 4400 2750 2000 15036
    STC-15-14 25704 3700 3215 2300 17836
    STC-20-14 33974 4620 3215 2300 22422
    STC-25-14 40778 4620 3490 2500 27446
    STC-30-14 47422 5012 3470 2700 30898
    STC-40-14 64150 6012 3915 2680 43614
    STC-50-14 80182 7000 4145 2900 55526
    STC-60-14 100800 7000 4180 3500 69754

    SCOPE OF SUPPLY

    As standard

    • Main tank
    • Air compressor
    • Discharge pump
    • Electrical control panel
    • Chlorination & dechlorination systems

    Optional

    • Fitted vacuum sewage collection equipment
    • Conditioning water flow meter
    • Standby compressor (mounted)
    • Standby discharge pump (mounted)
    • Maceration
    • Separate sewage feed system
    • Retrofit options available to aid installation

    Process flow of a Wärtsilä sewage treatment plant

    Process Flow Wärtsilä sewage treatment plant

     

     

    References

    Twister

    The Wärtsilä AQUARIUS® UV Ballast Water Management System (BWMS) was installed onboard the Twister, a Chemgas BV owned LPG carrier, as part of the Type Approval process.

    The Twister is designed to transport gas and chemical products along shallow rivers. A fast BWMS installation process was therefore essential to reduce the downtime impact on the vessel’s operations. For retrofit applications and upgrades, where space availability can be a determining factor, the modular configuration of Wärtsilä’s AQUARIUS® range was a particular advantage and the entire installation process took just 3 weeks.

    With the trial period successfully completed, and full compliance with the IMO D2 performance standard had been demonstrated, the Wärtsilä AQUARIUS® was awarded Type Approval in accordance with the requirements of the 2004 IMO Convention for the control and management of ships’ ballast water and sediments. The Wärtsilä AQUARIUS® UV was the first BWMS to have been fully endorsed and type approved by the Flag Administration of the Netherlands.

    The vessel is also equipped with the Super Trident Sewage Treatment Plant ST1A, certified to meet IMO MEPC 159(55) guidelines. Optimised for the treatment of black and grey wastewater flows, and suitable for conventional gravity and vacuum fed collection systems, the Wärtsilä Hamworthy Sewage Treatment Plant is controlled automatically. This allows unattended operation, with reduced maintenance requirements and lower long-term operating costs.

    Twister, LPG Tanker, 2010

    Learn more about Ballast Water Management Systems

      Challenge
      Solution

      AQUARIUS® UV Ballast Water Management System (BWMS) 

      Super Trident Sewage Treatment Plant ST1A

      Benefits

      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.

      For NEWBUILD & RETROFITS, please contact +44 1202 662 600 or waw.sales@wartsila.com

      For spare parts, please e-mail us with the Equipment Serial Number or the name of the vessel at pse@wartsila.com. For urgent support, contact +44 1202 662 634.

      For technical support & service, please email us with the Equipment Serial Number or the name of the vessel at poole.service@wartsila.com. For urgent support, contact +44 1202 662 616.

      Equipment Serial Number is taken from the equipment nameplate and includes all letters and numbers as given on the equipment nameplate.