熱淡水化システムへのCO₂回収統合：淡水生産と海水炭素回収の二目的アプローチ
Integrating CO₂ Recovery into Thermal Desalination Systems: A Dual-Purpose Approach to Freshwater Production and Seawater Carbon Capture (原題)
Mauro Capocelli, Erika Ballini, Mauro Luberti
🤖 gxceed AI 要約
日本語
多段フラッシュ（MSF）および多効蒸留（MED）淡水化プラントの非凝縮性ガス（NCG）排気をCO₂回収源として活用する初のプロセスレベル評価。Aspen Plusで海水炭酸塩化学・電解質熱力学・CO₂放出・空気漏入を明示的にモデル化し、標準海水・アラビア湾高塩分海水・RO濃縮ブラインの3種を比較した。熱脱気により供給DICの9〜28%が放出され、MSFで173〜193 g CO₂/m³、MEDで30〜70 g/m³、ROブラインでは2〜3倍となる。淡水化ハブを水とCO₂の二目的施設とし、永続貯留と組み合わせた海水ベース炭素除去の経路となり得ることを示す。
English
First process-level assessment of using non-condensable gas vents from thermal desalination (MSF/MED) as a CO₂ recovery feed. Aspen Plus models explicitly capture seawater carbonate chemistry, electrolyte thermodynamics, CO₂ release, air leakage and NCG extraction, benchmarked against reference plants. Thermal degassing releases 9–28% of feed DIC (173–193 g CO₂/m³ distillate in MSF, 30–70 g/m³ in MED, 2–3× with RO brine), yielding vents of 0.3–0.9 mol/mol CO₂. Desalination hubs can thus act as dual-purpose water–CO₂ facilities and, with permanent storage, a seawater-based carbon removal route.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本は海水淡水化と沿岸産業の共存が進み、CCUS拠点整備を政策課題とする。本論文は淡水化施設を炭素除去インフラとして再定義する視点を提供し、国内CCUSバリューチェーンやGX推進の議論に接続しうる。
In the global GX context
Amid ISSB/CSRD-driven scrutiny of carbon removal claims, this work offers a novel engineered CDR pathway tied to water infrastructure. It broadens the global CCUS and seawater-based carbon removal literature with process-level, validated modeling.
👥 読者別の含意
🔬研究者:淡水化とCCUSを統合したプロセスモデリングと海水炭酸塩化学の検証手法を参照できる。
🏢実務担当者:淡水化・用水インフラ企業がCO₂回収の追加収益・炭素除去クレジット化の可能性を検討する材料になる。
🏛政策担当者:CCUS拠点や炭素除去の制度設計において、淡水化施設を二目的インフラとして位置づける根拠を提供する。
📄 Abstract（原文）
Achieving climate neutrality requires carbon dioxide removal strategies capable of addressing dilute environmental carbon reservoirs, in addition to carbon capture from point sources. On the other hand, global water scarcity continues to drive the expansion of seawater desalination that continuously extract non-condensable gases (NCG), releasing part of the dissolved inorganic carbon (DIC) as CO₂. This work assesses, for the first time at process level, the utilization of NCG vent of thermal desalination plants as a feed for CO₂ recovery. Aspen Plus models were developed for Multi-Stage Flash (MSF) and Multi-Effect Distillation (MED) desalination plants, explicitly including seawater carbonate chemistry, electrolyte thermodynamics, CO₂ release, air leakage and non-condensable gas extraction through simplified steam-ejector representations. Three feed compositions were considered: standard open-ocean seawater, high-salinity Arabian Gulf seawater and concentrated reverse-osmosis brine. The models were benchmarked against reference plants and literature works and used to assess the influence of temperature, number of stages/effects and feed composition on CO₂ recovery and NCG composition. CO₂ release was described with a non-equilibrium approach, i.e. the kinetics of bicarbonate and temperature-dependent stage degassing efficiency, validated against reference distillers. Thermal degassing releases 9–28% of the feed DIC, 173–193 g CO₂ per m³ of distillate in MSF and 30–70 g m⁻³ in MED with natural seawater, and two to three times more with RO brine; after water removal, the vent contains 0.3–0.9 mol mol⁻¹ CO₂. This work also presents preliminary economic results of integrated Carbon Capture plants demonstrating that thermal desalination hubs can therefore act as dual-purpose water–CO₂ facilities and, coupled with permanent storage, as a route for seawater-based carbon removal.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.dwt.2026.101997first seen 2026-10-21 04:41:34
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