Wärtsilä Wet & Dry Waste Systems

Wärtsilä Water Systems can offer complete system supply and a range of wastewater products, including sewage treatment systems, membrane bioreactors, vacuum collection systems, toilets, macerators, grease traps, holding tanks and transfer pumps, ensuring a reduced technical risk.

Sewage Treatment Systems

Wärtsilä Hamworthy Sewage Treatment Plants

The Wärtsilä Hamworthy Super Trident sewage treatment plant is the cost-effective and safe answer to disposing of waste at sea, maintaining the quality of the world’s oceans.

Our sewage treatment plants are certified to meet IMO MEPC 227(64) guidelines, which will be applicable to new ships from 1 January 2016.

Optimised for the treatment of black and grey wastewater flows, and suitable for conventional gravity and vacuum fed collection systems, all plants are controlled automatically. This allows unattended operation, with reduced maintenance requirements and lower long-term operating costs.

The systems are compact and modular in design, suitable for between-deck installations, and are adaptable to customer new build specifications.

Wärtsilä Hamworthy Retrofit Sewage Treatment Plant

Widely regarded as standard specification by many of the world’s shipowners, the Wärtsilä Hamworthy Super Trident sewage treatment plant is the cost effective, safe answer to disposal of wastewater at sea.

Due to the modular design, no hull penetration is required as separated units can be transported through standard vessel access ways, and there is minimum maintanance required.

The plant ensures compliance to IMO legislation – MEPC.227(64)

Wärtsilä Waste Water Site

Oily Water Separators

Wärtsilä Oily Water Separators

The Wärtsilä Oily Water Separator (OWS) easily handles bilge water with minimum impact for operation staff and with results that easily surpasses current and future legislative requirements.

The technology behind the Wärtsilä OWS is a combination of optimized traditional methods and innovative new solutions. The separator consists of a four-stage, emulsion-breaking unit, where each stage handles one key component of the sludge and bilge mix. It can handle input flows with an oil content of between 0 and 100%, making it the most versatile separator on the market.

The Wärtsilä OWS units are IMO and US Coast Guard approved and gives the operator effective control over all bilge media as well as over any discharges made into the sea. The amount of oil in water after treatment is less than 5 ppm.

Wärtsilä OWS Site

Vacuum Systems Technology

Wärtsilä Vacuum Toilets

Wärtsilä vacuum toilets use air to drive waste from the toilet to the treatment tank or intermediate collection tank. This contemporarily styled toilet has a built-in vacuum breaker and flush memory, is simple to install, and is supplied ready to connect. The control mechanism can be accessed without removing the bowl. By using only approximately 1 litre of water, the amount of wastewater is dramatically reduced.

Wärtsilä also offers a Vacuum Interface Valve, which provides an interface between the sewage collection system and conventional grey water drains and urinals. The valve enables an easy connection to gravity-based appliances, enabling cost savings and effective integration with the vacuum system piping. The valve is reliable, easy to maintain, and has been installed in USN/USCG ships and merchant marine vessels throughout the world.

Wärtsilä Vacuum Collection System

The Wärtsilä vacuum collection system uses differential air pressure to transport sewage from the toilet bowls, and other sanitary fittings, to the Sewage Treatment Plant (STP) or independent collection tank.

Ejectors can be mounted direct to the STP for modular construction without the need for a separate collection tank, and only a small amount of flush water is needed compared to conventional gravity systems.

Wärtsilä Vacuum Systems Site

Useful Downloads

Sewage Treatment Plant Brochure


Oily Water Separator Brochure


Vaccum Toilets Brochure