Greenhouse gas emissions from urban wastewater treatment systems in Managua, Nicaragua
マナグア（ニカラグア）の都市下水処理システムからの温室効果ガス排出 (AI 翻訳)
Edwin Antonio Ojeda Olivares, Felipe Santiago López Solís, Loyda Isamar Mendieta Sotelo, Jassy Danisse Rivera Solís
🤖 gxceed AI 要約
日本語
本研究は、ニカラグア・マナグアの8つの下水処理施設を対象に、IPCC手法を用いてGHG排出量を初めて包括的に推定。嫌気性システムがメタン排出の大部分（60-85%）を占め、好気性システムがCO2排出で高い。全体で年間2.96 Gg CO2換算を排出し、ニカラグアの下水処理部門の0.353%に相当。局所的な排出係数と能力開発の必要性を強調。
English
This study provides the first comprehensive assessment of GHG emissions from eight decentralized wastewater treatment plants in Managua, Nicaragua using IPCC methods. Anaerobic systems dominate methane emissions (60-85% of footprint), while aerobic plants have higher CO2. Total emissions are 2.96 Gg CO2-eq/year, 0.353% of Nicaragua's wastewater sector. Findings highlight the need for local emission factors and capacity building.
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
日本では下水処理のGHG排出は既に把握されているが、途上国における小規模分散型システムの実態データは少なく、国際的な排出インベントリ改善やJCMプロジェクトの参考になる。
In the global GX context
While wastewater emissions are well-studied in developed countries, this paper provides rare empirical data from a developing country's decentralized systems, contributing to global GHG inventory improvement and climate policy in the sanitation sector.
👥 読者別の含意
🔬研究者:Provides baseline emission factors and methodology for small-scale wastewater systems in tropical developing countries.
🏢実務担当者:Can inform wastewater treatment plant design and operational choices to reduce GHG emissions in similar contexts.
🏛政策担当者:Supports the integration of wastewater management into national climate commitments and NDCs for developing countries.
📄 Abstract（原文）
ABSTRACT Graphical abstract of eight wastewater treatment plants in Managua, showing treatment types and emissions; anaerobic systems produce more methane, while aerobic systems produce more carbon dioxide. This study presents the first comprehensive assessment of greenhouse gas (GHG) emissions from decentralized sewered urban wastewater treatment systems (WWTS) in Nicaragua, focusing on eight representative plants in Managua's southern lake basin. It estimates CH4 and N2O emissions using IPCC methodologies, combining field surveys with historical data from 2013 to 2024 to quantify emissions from small-scale systems. The WWTS – including extended aeration, UASB reactors, biodigesters, and MBBR technologies – collectively emitted 8,113.33 kg CO2-eq/day (2.96 Gg CO2-eq/year), representing 0.353% of Nicaragua's wastewater sector emissions. Anaerobic systems (WWTS 2/3/6/8) dominated methane (CH4) release (60–85% of footprint, up to 76.1 m3 CH4/day), while energy-intensive aerobic plants (WWTS 1/7) showed the highest CO2 emissions (309.28 kg/day at 0.264 kWh/m3). N2O emissions (0.005 kg N2O-N/kg N removed) peaked at 0.364 kg/day in systems with nitrogen removal. This study addresses important data gaps regarding decentralized wastewater treatment systems (WWTS) in developing regions with limited data and offers a framework for aligning wastewater management with climate objectives. The findings highlight the urgent need for localized emission factors and capacity building to reduce greenhouse gas (GHG) emissions from the rapidly growing urban sanitation infrastructure in Nicaragua.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.2166/washdev.2026.136first seen 2026-05-14 22:36:12
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