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Smart Water Solutions. Local Expertise. Global Impact

Established in the UK for over 20 years, we operate from six strategic locations, employ a workforce of over 400 skilled professionals, and currently operate and maintain more than 30 water treatment assets on behalf of our clients.

We serve Municipal, Industrial, and Commercial clients across a wide range of sectors, supporting them with bespoke solutions for Drinking Water, Wastewater, Process Water, Water Reuse, and Resource Recovery. Whether it’s ensuring compliance for utilities, enhancing operational efficiency for manufacturers, or enabling circular water use in commercial facilities, our team of experienced professionals is committed to delivering results that are sustainable, efficient, and reliable.

Our mission, #MissionWater, is brought to life through our ‘Customer for Life’ philosophy — a long-term partnership approach that begins with understanding your challenges and continues with delivering performance and value throughout the lifecycle of your assets. Through our integrated approach to Technology, Services, and Solutions, and our commitment to the 4R PrincipleReduce, Reuse, Remove, Recover — we help turn water and wastewater challenges into opportunities for resilience and resource optimisation.

About Us

Our Mission

At NSI UK & Ireland, we believe water is our planet’s most precious resource, and it’s time everyone treats it that way. Our purpose is to be an advocate for water, ensuring that municipalities, industries, communities, and individuals across the UK and Ireland truly value it.

Beyond our daily work of providing reliable water supplies and responsible treatment solutions, we’re committed to acting and influencing others. Together, we can invest in saving water and innovate new models to preserve this vital resource.

For too long, we’ve treated clean water as an endless, cheap commodity, overlooking its true worth, but with increasing pressure on water quantity and quality, it’s clear this resource desperately needs revaluing – environmentally, socially, economically, and technologically. It’s time to turn the tide – we need to ensure water is valued as the revitalising force it has always been, making its benefits accessible to all.

We call this #MissionWater. Are you ready to join the movement and help us secure a sustainable water future for the UK and Ireland?

Our Services

Wastewater Treatment

Our wastewater treatment solutions are tailored to meet the specific needs of municipalities and industries, ensuring both regulatory compliance and sustainable outcomes. We employ a multi-stage approach, starting with primary treatment to remove solids and grit. Secondary treatment utilizes biological processes to reduce organic matter, followed by advanced tertiary treatment (like membrane filtration and nutrient removal) for more stringent requirements. Our solutions are customised for various industries, incorporating industry-specific technologies and resource recovery options. Additionally, we manage sludge treatment and disposal, employing techniques like thickening, dewatering, digestion, and sustainable disposal practices to minimize environmental impact and maximize value.

Discover our solutions

Gas liquid contact system – Crescendo®

  • Process water
  • Industrial water
Crescendo® is an innovative technology that combines multiple functions into one compact system. Whether it’s evaporating and thickening liquids, stripping or cooling gases, (...)

Media filtration – Disc filter

  • Drinking water
  • Wastewater
  • Industrial water
Discfilter for effluent polishing Water flows into rotating discs lined with micro fabric, filtering from the inside out. Solids stick to the panels, clean water passes through. (...)
ByoPast Pasteurization system
  • Industrial

Pasteurization – ByoPast®

  • Resource Recovery
  • Sludge
  • Wastewater
  • Industrial water
  • Process water
To allow digestate produced from food- or animal by-products to be used or sold as a fertilizer and soil improver according to environmental legislation, pasteurization is needed. (...)
Econvert Anaerobic Rental at Nordzucker
  • Industrial

Anaerobic – Econvert Anaerobic Rental

  • Wastewater
  • Industrial water
  • Resource Recovery
We understand that CAPEX is not always readily available to invest in anaerobic wastewater treatment, or that you may want to avoid long-term financial commitments. At Econvert, (...)
  • Industrial

Anaerobic – Econvert-DGF

  • Resource Recovery
  • Industrial water
  • Wastewater
The Econvert-DGF® (Dissolved Gas Flotation) is an anaerobic solution developed to treat raw wastewater with high concentrations of total suspended solids (TSS) and fats, oils, (...)
  • Municipal

Digital solution – Hydranet

  • Wastewater
  • Drinking water
Real-Time Energy Optimization for Water Networks Hydranet is Riventa’s digital platform designed to monitor, analyze, and optimize the performance of pumps, blowers, fans, and (...)
  • Industrial
  • Municipal

Filter – FlooScreen™

  • Drinking water
  • Process water
  • Industrial water
  • Wastewater
FlooScreen™ screening units are advanced filtration systems designed for industries, communities where high capacities of high-quality water screening is necessary to efficiently (...)
  • Municipal
  • Industrial

DAF – High rate concrete i-DAF

  • Industrial water
  • Drinking water
  • Wastewater
The NSI high rate concrete i-DAF, a dissolved air flotation system, removes solids in primary, secondary, and tertiary water treatment within compact spaces.
  • Municipal
  • Industrial

NSI Digital Platform

  • PFAS
  • Micropollutants
  • Wastewater
  • Drinking water
  • Source water
  • Rainwater
  • Resource Recovery
  • Sludge
  • Process water
  • Industrial water
NSI Digital Solutions’ Platform and our other services and designed are developed to combine deep industry expertise with advanced digital capabilities, supporting industrial (...)
Econvert-RTF Biogas Desulfurization
  • Industrial

Anaerobic – Econvert-RTF

  • Wastewater
  • Industrial water
The Econvert-RTF® is a regenerative trickling filter which achieves high H2S removal efficiency, consumes no caustic soda and enables aerobic effluent reuse. The technology prevents (...)
Econvert-Dsulph biogas desulfurization
  • Municipal
  • Industrial

Anaerobic – Econvert-Dsulph

  • Resource Recovery
  • Industrial water
  • Sludge
  • Wastewater
The Econvert-Dsulph® is a proven, high-efficiency biogas desulfurization solution that combines the chemical absorption of hydrogen sulfide (H2S) in the scrubber with the biological (...)
  • Municipal
  • Industrial

Ammonia stripper – ByoFlex®

  • Resource Recovery
  • Industrial water
  • Sludge
  • Wastewater
  • Process water
With the revolutionary ByoFlex® system nitrogen is recovered from highly contaminated substrates. The ByoFlex® system is a one-of-a-kind ammonia stripping unit. Through years (...)
  • Industrial
  • Municipal

Screw press – NSP

  • Industrial water
  • Sludge
  • Wastewater
The sludge dewatering screw press from NSI (NSP) offers a cost-effective and sustainable solution for sludge dewatering. Designed to treat both primary and biological sludge, the (...)
  • Industrial

Membrane – DEEPEST®

  • Wastewater
  • Industrial water
  • Process water
The Deepest System® is a patented multi-stage, multi-membrane purification system developed by Sodai. It employs sequential microfiltration, nanofiltration, and reverse osmosis (...)

Membrane – CeraMac®

  • Drinking water
CeraMac® is an innovative and cost-effective ceramic membrane filtration solution, designed to provide high-performance, sustainability, and robustness to water treatment processes. (...)
  • Municipal
  • Industrial

Aerobic – BIOCTOR-FlooBed®

  • Wastewater
  • Industrial water
A highly efficient and compact biological treatment process to treat a wide variety of industrial and municipal wastewater streams and ensure environmental compliance. The patented (...)
  • Municipal
  • Industrial

Anaerobic – Econvert-IR

  • Wastewater
  • Industrial water
The Econvert-IR® (Internal Recirculation) is designed to create the ideal process conditions – even under extreme conditions. Thanks to its unique two-stage settling system, (...)
  • Industrial

Anaerobic – Econvert-UASB

  • Wastewater
  • Industrial water
The Econvert-UASB®(Upflow Anaerobic Sludge Blanket) has a proven track record for decades. Its robust and reliable configuration enables the handling of large varieties of wastewater (...)
Econvert-EGSB Anaerobic Wastewater treatment
  • Industrial

Anaerobic – Econvert-EGSB

  • Wastewater
Econvert-EGSB® (Expanded Granular Sludge Bed) is the optimal solution after decades of experience, development and optimization. Combining a small footprint with robust internals (...)
  • Municipal
  • Industrial

DAF – FlooDaf®

  • Process water
  • Industrial water
  • Resource Recovery
  • Wastewater
  • Sludge
  • Drinking water
A high-capacity, compact flotation solution for various large-scale water and wastewater treatment applications enabling raw material recovery, decreased water consumption and (...)
  • Municipal

Flocculation-coagulation – ILCA®

  • Drinking water
In-Line Coagulation and Adsorption ILCA® is a compact in-line coagulation and adsorption process developed by PWNT to simplify and optimise pre-treatment upstream of advanced (...)
CirTec IntenSieve Gaarkeuken
  • Municipal
  • Industrial

Filter – IntenSieve®

  • Wastewater
  • Industrial water
  • Resource Recovery
The IntenSieve® is a rotating belt finesieve. A compact, chemical-free finesieving solution that removes suspended solids and frees biological capacity.

Our References

  • Municipal
  • Municipal drinking water
Plymouth, England, United Kingdom

Mayflower Water Treatment Works (South West Water)

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  • Food & Beverage
  • Industrial
Rock, Cornwall, United Kingdom

Sharp’s Brewery Wastewater Treatment Plant

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Contact our experts

NSI UK & Ireland - Truro Office

Main Office

Nanjerrick Court,
Allet
Truro
TR4 9DJ
United Kingdom

NSI UK & Ireland - Wokingham Office

15 Metro Centre,
Toutley Road
Wokingham
RG41 1QW
United Kingdom

NSI UK & Ireland - Stoke Office

NSI Mobile Water Solutions UK Ltd
Whittle Road
Stoke-on-Trent,
ST3 7QD
United Kingdom

NSI UK & Ireland - Grangemouth Office

Dundas Building – North Gate
Earls Road
Grangemouth
FK3 8XG
United Kingdom

NSI UK & Ireland - Gainsborough Office

Unit 33,
Corringham Road Industrial Estate,
Gainsborough,
DN21 1QB
United Kingdom

NSI UK & Ireland - Wallsend Office

Town Hall Chambers,
High Street East
Wallsend,
NE28 7AT
United Kingdom

NSI UK & Ireland - Wynyard Office

Evolution1, Wynyard Avenue,
Wynyard Park,
Billingham,
TS22 5TB
United Kingadom
Team collaboration, Vacancies

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