Water treatment for hydrogen production by electrolysis

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43933457" target="_blank" >RIV/60461373:22310/25:43933457 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22320/25:43933457

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Water treatment for hydrogen production by electrolysis

Original language description

Technological processes used in modern world generate emissions and wastewater, both of which negatively affect the environment. Among them is hydrogen production, which is associated with high energy consumption and relatively high water usage approximately 9 to 15 liters of theoretical water demand, while in practice it ranges from 20 to 30 liters per kilogram of hydrogen.. The water used in hydrogen production must be highly purified, and during its pre-treatment, saline wastewater is produced. This wastewater must be eliminated and not discharged into the environment, as it can disrupt native natural conditions. A viable solution to this issue is the concept of Zero Liquid Discharge (ZLD).The electrolyser used in hydrogen production generates not only hydrogen but also warm water, which can serve as a thermal energy source for ZLD. Using a vacuum evaporator the saline water can be evaporated at temperatures below 70 °C, enabling the development of a system where saline water is concentrated into a salt slurry which can be usable as feedstock in chlor-alkali or soda processes while distilled water is recovered and repeatedly used in hydrogen production. This reduces liquid waste to zero and provides reusable feedstocks, thereby lowering overall process costs. As part of this work, optimal flow rates within the evaporator system were investigated, both the flow of heated brine and the warm water supplied from the electrolyser as the thermal energy source. In addition, it was necessary to design and assemble the entire system. Initially, a process model of the system was created using Aspen software which then served as the basis for constructing the physical prototype. The core component of the system is the evaporation chamber, where water evaporation and brine concentration are expected to occur. The water vapor is separated and subsequently condensed outside the evaporation chamber. Once the brine reaches a high salt concentration, it is extracted and used as a raw material for further production processes.The saline water originates from the pre-treatment stage of the MCVD process and is continuously fed into the evaporator system. The feed rate can be regulated, ensuring that the system does not become overloaded. In contrast to conventional membrane-based wastewater treatment technologies, this system is capable of operating intermittently without risk of damage or process instability.This work was carried out with the support of the Technology Agency of the Czech Republic under the project. TS01020164.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/TS01020164" target="_blank" >TS01020164: Demineralized water production for hydrogen production by electrolysis with zero liqiud discharge</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů