Propagation of side-stream partial nitritation–anammox disturbance to mainstream wastewater greenhouse gas emissions
サイドストリーム部分硝化・アナモックス擾乱の主流廃水温室効果ガス排出への伝播 (AI 翻訳)
Zhufang Wang, Xiaobo Shen, Bang Du, Wenhan Li, Paul Church, Claudio Avignone-Rossa, Kai Yang, Bing Guo
🤖 gxceed AI 要約
日本語
実規模廃水処理プラントにおいて、サイドストリーム部分硝化・アナモックス（PN/A）プロセスの擾乱が主流処理の温室効果ガス（GHG）排出に与える影響を評価。擾乱時にN2OおよびCH4排出が増加し、総GHG排出量が約34%増加した。メタゲノム解析により、アナモックス細菌の減少とニトロソモナス関連N2O生成能の上昇が原因と示唆された。
English
This study evaluates how disturbance of side-stream partial nitritation-anammox (PN/A) affects mainstream greenhouse gas (GHG) emissions in a full-scale wastewater treatment plant. Under disturbed operation, N2O and CH4 emissions increased, raising total estimated GHG emissions by ~34%. Metagenomic analysis revealed reduced anammox bacteria and increased nitrifier-associated N2O production potential.
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
日本では下水処理場からのGHG排出削減が課題であり、本知見は省エネ型窒素除去プロセスの安定運用指針に寄与する。ただし、開示枠組み（SSBJ等）との直接的な接続は弱い。
In the global GX context
This paper provides empirical evidence on how operational instability in energy-efficient nitrogen removal can increase GHG emissions, relevant for global wastewater treatment optimization and climate mitigation strategies.
👥 読者別の含意
🔬研究者:Provides mechanistic insights into how PN/A disturbances propagate to mainstream GHG emissions, useful for process modeling and optimization.
🏢実務担当者:Highlights the need for stable PN/A operation to avoid unintended increases in GHG emissions from wastewater treatment plants.
🏛政策担当者:Indicates that policies promoting AD intensification should consider potential trade-offs with PN/A stability and GHG emissions.
📄 Abstract（原文）
Abstract Side-stream partial nitritation-anammox (PN/A) process is energy efficient for nitrogen removal but highly sensitive to disturbances such as high organic loadings from anaerobic digestion (AD) liquor. How such disturbance affects downstream treatment performance and greenhouse gas (GHG) emissions in full-scale plants remains insufficiently understood. Here, a full-scale Anoxic-Aerobic-AD-PN/A wastewater treatment plant was compared during satisfied and disturbed PN/A operation. Under disturbed operation, the mainstream apparent liquid-phase TN removal rate decreased from 472.4 to 298.2 kg-N/d and estimated N 2 O and CH 4 emissions increased by 69.39 kg-N 2 O/day and 10.99 kg-CH 4 /day, respectively. Estimated mainstream GHG emissions rose from 61784.2 to 82768.9 CO 2 -eq.kg/day. A broader comparison including PN/A N 2 O estimates and biogas-electricity offset also suggested increased climate burden (58997.2 to 77742.1 CO 2 -eq kg/day). Metagenomic analysis showed marked reductions in the relative abundance of Ca. Brocadia and Nitrosomonas in PN/A, together with a strong depletion of anammox genes, hdh / hzo . Elevated Nitrosomonas -associated cytochrome P460 and higher abundances of nirK/norBC (assigned to Nitrosomonas and Nitrospira ) in the Anoxic and Aerobic tanks were consistent with increased nitrifier-associated N 2 O-production potential. These findings indicate that disturbance of side-stream PN/A can propagate to the mainstream and increase estimated mainstream GHG emissions, highlighting the need to balance AD intensification with stable PN/A operation.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.1038/s41545-026-00600-8first seen 2026-06-24 05:44:47
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