Water treatment for green hydrogen

Production of green hydrogen is becoming an essential part

Green hydrogen is vital for achieving the goals of the Paris Climate Agreement. It is produced through water electrolysis, in which only electricity from renewable energy sources is used.

Green hydrogen can then be used as an alternative fuel or feedstock in industry, as a fuel for shipping and long-distance transport, or it can converted into electricity and heat.

These various options when it comes to using green hydrogen are also referred to as power-to-X and play an important role in climate protection and decarbonisation of the economy.

We offer solutions for the production of ultrapure water

Water is the central feedstock for production of green hydrogen.

Herco provides the entire water treatment system incl. the pure water cycle tailored to the necessities of the client. Our portfolio includes compact units for piloting, large-scale plants with sophisticated process technology or containerised units for rapid installation and start-up on site.

Our experts will be happy to advise you on requirements of PEM, AEM or alkaline electrolysis, the appropriate process technology for water treatment and the selection of suitable materials.

We design modular, scalable units for you and customise or label them according to your requirements.

“I believe that the future of our blue planet depends on innovative technologies such as green hydrogen.”

Birgit Fabritius, Product Manager

Plant engineering:
Water treatment for the production of ultrapure water

2 Reverse osmosis

Single or double stage RO
Membrane contactors (MEG)
Electro-deionisation (EDI)

3 Storage and distribution

Pure water storage tank
Pumping station for distribution
Mixed-bed demin cartridge as control

4 Pure water

UV unit for TOC reduction
Mixed-bed demin cartridge for conductivity reduction

Water treatment plants for the production of green hydrogen

Production of hydrogen at a wind farm in Sweden

Production of hydrogen as a fuel for vehicles in Austria

Production of CO2-neutral fuel from hydrogen in Chile

Reverse osmosis system with EDI

Our typical ultrapure water plant "UP-S7 12000 PP/MEG" for the hydrogen industry is used to produce diluate with a conductivity < of 0.2 μS/cm by complete desalination of softened water according to the principle of reverse osmosis (RO) in combination with electrodeionisation (EDI).

Advantages of the ultrapure water system

  • Very good permeate quality due to combination of UO and EDI (typical conductivity < 0.2 μS/cm).
  • No chemicals required, continuous operation without interruptions
  • Convenient and user-friendly PLC S7-1200
  • Permeate recirculation PR and low-pressure piping in PP
  • Data transmission to the central control system
  • 30 - 50 % less energy required with FU pump


Our ultrapure water plants

You will find our water treatment systems, including those for the production of ultrapure water, from page 42 onwards in our general product catalogue.

File format:
PDF / 5.4 MB

Green hydrogen brochure

Our expertise and technology in water treatment for the production of green hydrogen in one .pdf.

File format:
PDF / 746.6 KB

What is osmosis or reverse osmosis?

Osmosis describes the natural process in which water is separated from a solution by a semi-permeable membrane and diffuses through this membrane.

What is ultrapure water needed for?

In many processes, specific requirements are placed both on the purity of the water needed and on the plant technology.

We will be happy to advise you on water treatment solutions for the production of green hydrogen.

Any questions? Just get in touch with me.
+49 (0) 7141 7095 681

Why Herco for Power-to-X?

Individual water treatment

We provide efficient, resource-saving and reliable treatment systems that are tailored to your requirements in terms of conductivity, metal content and TOC. In this way, we create the prerequisites for high availability of the electrolyser and smooth operation. In consultation with you, we find intelligent solutions for space-saving container installation and the appropriate control concept.

Long product life

Treatment in the ultrapure water loop is indispensable in PEM electrolysis in order to ensure the longest possible service life of the electrolyser. Our units for the reduction of TOC and conductivity are adapted to the elevated temperatures in the loop and are only made of materials that are not harmful for the electrolyser stack. Depending on customer requirements, we provide complete systems or components for individual installation.

High quality standard

We have a lot of experience in water treatment for green hydrogen. Our high-quality units are manufactured by our production team in Germany, parametrised before delivery and tested in our test facility. This means that commissioning can be carried out quickly and easily on site. Through standardisation and the close relationship between planning and production, we can offer you very short delivery times, helping you to complete projects quickly.

Interview at the Aquatech 2021 about Green Hydrogen:
with Birgit Fabritius (Herco) and Micheline Verhaeghe (PWG)

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