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Vol. 13 No. 02 (2026)
International Multidisciplinary Journal for Research & Development

Articles

WATER TREATMENT FOR “GREEN” HYDROGEN PRODUCTION IN ALKALINE ELECTROLYZERS

Published 2026-02-05

  • Akmaljon Mirzatillaevich Kudratov
    • ,
  • Isayev Sobirjon Murotaliyevich,

Akmaljon Mirzatillaevich Kudratov
DSc (Chemistry), Senior Research Fellow; Professor, Department of Exact and Natural Sciences, University of Geological Sciences

Isayev Sobirjon Murotaliyevich,
Control room engineer; Green Hydrogen plant,

Abstract

This paper systematizes typical feedwater quality requirements for AWE systems and explains why the parameters of specific electrical resistance (resistivity) and electrical conductivity are interrelated quality-control indicators. The main technological solutions for producing demineralized water are reviewed, including mechanical filtration, activated carbon filtration, reverse osmosis (RO), and electrodeionization (EDI). Key operational risks are also discussed, such as channeling, increased pressure drop (ΔP), carryover of carbon fines, biofouling, and oxidative damage to RO membranes. As a practical example, an aggregated process scheme is presented for a water treatment line designed to produce demineralized (DM) water with a target quality of approximately 1 MΩ·cm or higher. Recommendations are provided for monitoring (conductivity/resistivity, SiO₂, TOC, Cl⁻, iron), filter backwash regimes, protection of RO membranes from chlorine, and reduction of factors that contribute to increased cell voltage during AWE operation.

Keywords

green hydrogen; alkaline electrolyzer; AWE (alkaline water electrolyzer); demineralized water; reverse osmosis; EDI (electrodeionization); activated carbon; conductivity; resistivity; impurities; degradation; voltage increase.

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References

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