Sodai

Closing the water loop: water, smarter, together

Sodai, part of Nijhuis Saur Industries, turns every water challenge into an opportunity. Through R&D, proprietary technologies, and full-risk service models, we reduce the water footprint, optimize resource efficiency, and deliver measurable impact for industry, communities, and the environment.

Our 4Rs model — Reduce, Remove, Reuse, Recover — is designed to close the water loop and support industries and municipalities through a high-efficiency ecological transition.

We work for a more resilient, efficient, and regenerative future

+ Shape your future sustainably.

Helping industries in Italy with today’s water management challenges

Water is a critical resource in all kinds of industries, where increasingly demanding environmental requirements have given rise to new technologies and working practices to create a more sustainable way of operating industrial plants, sewage treatment and drinking water plants.

With over 500 references in the Italian market, with the combination of our other NSI technology companies, Sodai brings a wealth of knowledge and expertise to tackle every kind of water management challenge.

We do this for:

Food & beverage
Pharma & personal care
Pulp & paper
Energy
Municipal drinking water
Municipal wastewater

Learn more about our innovative membrane DEEPEST technology

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Key figures

500,000 m³

Of challenging water treated every year

+80%

Of water recovered and reused by our full-service plants

100%

Renewable energy used at our company sites

+50

Industrial sites managed in O&M, also remotely monitored with digital solutions

Innovating water, empowering industry

Sustainable water management:

We develop integrated strategies to manage the full water cycle, from sourcing and treatment to reuse and discharge, with a focus on environmental compliance, resource optimization, and long-term business resilience. Our solutions help reduce water dependency and support ESG goals across industrial and municipal sectors.

Operations & Maintenance (O&M)

Our full-scope O&M services ensure consistent plant performance, regulatory compliance, and cost-effective operation. From predictive maintenance to real-time monitoring, we take full responsibility for operational excellence, allowing clients to focus on their core business with peace of mind.

Research and Development (R&D)

Sustainability and innovation drive everything we do. Our in-house R&D and collaborations with academic and industry partners lead the development of advanced treatment technologies that address today’s most critical water and environmental challenges.

Water as a Service (WAAS)

Our WaaS model delivers flexible, performance-based water treatment services. We design, build, and operate water infrastructure for our customers, turning capital expenditures into predictable operational costs while ensuring measurable results in sustainability and efficiency.

Discover our wide range of water solutions

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Industrial
Municipal

Membrane filtration

Process water
Industrial water
PFAS
Micropollutants
Wastewater
Drinking water
Source water
Rainwater

At Nijhuis Saur Industries (NSI), part of Saur Group, we deliver membrane filtration solutions that drive water reuse, resource recovery, and environmental compliance. Our membrane (...)

Industrial
Municipal

Aerobic treatment

Industrial water
Wastewater

Aerobic biological treatment is a process that uses oxygen and microorganisms to remove COD and BOD, breaking down organic pollutants present in the wastewater into simpler, non-harmful (...)

Municipal
Industrial

Filter and screening systems

Wastewater
Drinking water
Industrial water

Filter and screening systems remove large particles from surface water and wastewater. By capturing debris early, they prevent pipe blockages and protect your equipment, helping (...)

Industrial
Municipal

Coagulation & Flocculation

Industrial water
Process water
Drinking water
Wastewater

Our coagulation and flocculation solutions are engineered to support efficient solid-liquid separation across industrial and municipal applications.

Municipal
Industrial

Dissolved Air Flotation solutions (DAF)

Drinking water
Wastewater
Industrial water
PFAS

Our DAF systems are engineered to provide high removal efficiency, operational flexibility, and reliable performance under varying conditions.

Industrial
Municipal

Anaerobic wastewater treatment

Industrial water
Resource Recovery

Anaerobic wastewater treatment is a very effective and sustainable way of removing biodegradable organic compounds (COD/BOD) from wastewater without using oxygen. As the organic (...)

Industrial
Municipal

Biogas treatment

Wastewater
Resource Recovery
Industrial water
Sludge

Where organic material is anaerobically degraded, biogas will be produced. In order to utilize this biogas, it needs the right quality, pressure and humidity. H2S is a specific (...)

Industrial

Demineralized Water Treatment

Process water
Industrial water

At Nijhuis Saur Industries (NSI), part of Saur Group, we deliver high-performance demineralized water treatment solutions for industrial steam and heat systems. From boiler feedwater (...)