Ultra Trident MBR wastewater treatment system.

High-performance wastewater treatment for regulated marine environments.

Hamworthy's Membrane Bio Reactor (MBR) technology is based on biological degradation and membrane separation and allows for the treatment of grey and black water to satisfy the most stringent standards.


The process produces the highest quality discharge without requiring any addition or generation of chemicals that are hazardous to the environment or ship operation.


Effluent quality tests conducted by the US National Sanitary Foundation on Hamworthy's Membrane Bio Reactor produced results exceeding the most stringent future legislative pollutant standards envisaged. The technology also achieved outstanding performance in Alaska under the scrutiny of the local authority, USCG and USEPA studies over the past seasons.


We also supply smaller, more compact versions of our MBR systems. Hamworthy Water & Waste mini-MBRs are ideal for use on smaller cruise and naval vessels, ferries with up to a 200 complement, as well as FPSOs and accommodation platforms.

Built for efficient, reliable wastewater treatment.

Externally mounted membranes provide safe, easy access and operational flexibility.
Membrane Clean-in-Place system comes as standard for simplified maintenance and sustained performance.
Ultra-low chemical consumption compared with other technologies helps reduce logistics requirements and environmental impact.
Advanced low-fouling membrane design supports improved energy efficiency.
Eliminates microplastics from treated effluent.
Robust process control system provides ease of operation and minimal manning requirements.
Predictable and optimised lifecycle cost, backed by Hamworthy's global support network.
Proven Hamworthy MBR technology designed to reliably meet stringent discharge requirements.

Ultra Trident MBR range.

The Ultra Trident MBR range provides a choice of treatment capacities to support different vessel requirements and wastewater loads.
Ultra Trident Model
UT-0.6
UT-1.3
UT-2.0
UT-2.6
UT-5.0
UT-7.0
UT-11
UT-16
UT-24
UT-36
UT-70
Maximum Hydraulic Loading (m³/day)
3.7
7.4
12.47
14.93
30
47.27
68.36
100.28
152.76
197.28
200
Maximum Organic Loading (kg/day)
2.60
6.08
9.33
12.15
24.96
34.94
50.56
74.00
112.41
164.05
173.6

Designed for stringent discharge requirements.

The Ultra Trident MBR is designed in accordance with MEPC.227(64) and Alaska Permit GP2013DB000 standards, supporting clean and safe wastewater treatment for marine and offshore applications.
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How the Ultra Trident MBR works.

Black and grey water enters the first stage of the bioreactor, which provides a buffer and mixing zone for the influent wastewater.

From the first stage, flow passes through to the second stage having been screened through an interstage filter to ensure all unwanted solids are removed from the system. In the second stage, the active biomass degrades the organic material before being circulated through ultrafiltration membranes to produce clean permeate which can be discharged overboard.

The Ultra Trident MBR can be configured for either carbonaceous treatment or nutrient removal. For nutrient removal, the plant is configured for NDN (nitrification/denitrification) treatment, which removes ammonia from the influent by transforming it into nitrogen gas that can be vented into the atmosphere. Nitrogen and phosphorus are removed from the wastewater by dosing Sodium Aluminate.

Ultra Trident MBR process diagram showing marine black and grey water treatment.

Membrane technology designed around operation.

The Ultra Trident MBR combines biological treatment with externally mounted ultrafiltration membranes to deliver effective treatment while maintaining straightforward access for operation and maintenance.

Externally mounted membranes provide greater accessibility and operational flexibility, while the standard Membrane Clean-in-Place system simplifies maintenance and helps sustain treatment performance.

Advanced low-fouling membrane technology also supports improved energy efficiency and ultra-low chemical consumption, helping reduce both operational requirements and environmental impact.

Explore other wastewater systems.

Hamworthy wastewater treatment solutions are designed to support different vessel requirements, operational demands, and installation constraints.

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Need support? Let’s get it sorted.

Looking for technical support, spare parts, or a tailored service solution? Our team is ready to help.

Talk to a service specialist