When Are Decentralised Non-Potable Water Systems Environmentally and Financially Viable? Evidence from a Water–Energy–GHG Evaluation of a Healthcare Facility in an Arid City
分散型非飲用水システムはいつ環境的・財政的に viable か？乾燥都市の医療施設における水・エネルギー・GHG評価からのエビデンス (AI 翻訳)
G. Seguela, J. Littlewood, G. Karani
🤖 gxceed AI 要約
日本語
アブダビの大規模医療施設を対象に、分散型非飲用水再利用システムのGHG排出原単位（kgCO2e/m3）とライフサイクルコストを評価。最適化構成により屋外水需要を36.7%削減し、10.94 kgCO2e/m3の純脱炭素化を達成。水供給源の代替とシステム構成が排出強度の主な決定要因であることを示した。
English
Using multi-year operational data from a large healthcare facility in Abu Dhabi, this study evaluates the GHG intensity (kgCO2e/m3) and life-cycle cost of decentralized non-potable water (NPW) systems. An optimized NPW configuration reduces outdoor water demand by 36.7% and achieves net decarbonization of 10.94 kgCO2e/m3. The results demonstrate that GHG intensity is driven primarily by water source substitution and system configuration rather than volumetric reuse alone.
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
本論文は水供給に伴うGHG排出を実証的に評価しており、水使用量が多い日本の施設（病院、工場等）でも同様の手法が応用可能。特に、スコープ3（上水・下水処理）の算定精緻化に寄与する可能性がある。
In the global GX context
This paper provides asset-level evidence on the decarbonization potential of decentralized water reuse in arid climates. It contributes to the global discourse on water-energy-GHG nexus, offering a methodology for integrating Scope 2 and Scope 3 emissions in building-level carbon accounting, relevant to TCFD/ISSB disclosures.
👥 読者別の含意
🔬研究者:Provides a replicable framework for evaluating water-related GHG intensity at asset scale.
🏢実務担当者:Offers a cost-benefit assessment methodology for facility managers considering onsite water reuse.
🏛政策担当者:Informs water strategy design by quantifying the environmental and financial viability of decentralized systems.
📄 Abstract（原文）
Rapid urbanisation in arid regions has increased reliance on energy-intensive desalinated water, intensifying environmental and financial pressures on the built environment. Although non-potable water (NPW) reuse is promoted within regional water strategies, empirical validation of decentralised systems at asset scale remains limited. This study applies a greenhouse gas (GHG) intensity metric (kgCO2e/m3) to multi-year operational data from a large healthcare facility in Abu Dhabi. The analysis integrates calibrated water balance records, onsite pumping energy (Scope 2), embedded desalination emissions (Scope 3), and a 20-year discounted cash flow framework. Three configurations are evaluated: a fully desalinated baseline, the observed mixed-supply system, and an optimised NPW configuration. The baseline exhibits an emission intensity of 19.53 kgCO2e/m3. The observed configuration reduces desalinated supply but achieves only marginal decarbonisation (0.40 kgCO2e/m3) due to continued dependence on desalinated make-up water. The optimised configuration reduces outdoor water demand by 36.7% and achieves 10.94 kgCO2e/m3 net decarbonisation while improving life-cycle cost (LCC) performance. The results show that GHG intensity is primarily driven by water source substitution and system configuration rather than volumetric reuse alone, providing asset-level evidence for evaluating decentralised NPW systems in arid-climate buildings.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.3390/su18062932first seen 2026-05-05 22:14:30
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