EDITOR’S PICKS
Veolia Water Technologies optimises green hydrogen production
Veolia Water Technologies has partnered with a major producer of green hydrogen and helped the company to increase production, whilst also reducing the volume of wastewater put to drain. Veolia Water Technologies supplied its TERION™ S 4000 unit, which combines reverse osmosis (RO) and continuous electrodeionisation (CEDI). This chemical-free solution enables the continuous supply of pure water and reduces the likelihood of the electrolysers sustaining damage by running dry.
The customer is a manufacturer of Proton Exchange Membrane (PEM) electrolysers and a leading producer of green hydrogen – a key fuel in global progress towards net zero. Having developed a tried-and-tested method, it was seeking to expand its production. As water is crucial for electrolysis – the process by which green hydrogen is generated – the facility required an increased volume; specifically, a constant stream of 4000 ltr/rh of water with a conductivity of <0.1µs/cm.
However, the customer’s previous water treatment plant had relied on standard units with exchange cylinders. Due to the low conductivity levels needed for the feed water, the polishing cylinders were exhausting quickly, resulting in expenditure for their regeneration and costly downtime. In addition, the existing
50 | August 2024 |
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RO plant used 40 litres of water for every 20 litres of pure water produced for electrolysis, so a lot of water was being rejected and put to drain, which was at odds with the company’s sustainability goals. As such, the customer sought a new water treatment system that would not rely on chemicals at any stage of the purification process to avoid degradation of the electrolysers.
Veolia Water Technologies proposed its TERION™ S 4000 unit, which combines RO and CEDI processes to ensure a chemical- free supply of pure water. Having worked
with other hydrogen producers, Veolia Water Technologies were able to offer experience with this kind of system delivery and recommend the creation of a central ring main system for the entire facility, which would utilise the single TERION™ S 4000.
The proposal also included 50,000 litres of water being held in storage to ensure the electrolysers would continue running, even if an unscheduled outage should occur. This aspect was crucial for the customer as the electrolysers can sustain damage if they run dry.
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