低C/N都市下水における炭素効率的窒素除去のための外因性脱窒バイオオーグメンテーション
Exogenous Denitrifying Bioaugmentation for Carbon-Efficient Nitrogen Removal in Low C/N Municipal Wastewater (原題)
Xikun Zhu, Chunsheng Liu, Zehua Li, Xufa Ma
🤖 gxceed AI 要約
日本語
低C/N都市下水の窒素除去において、外部炭素源の添加を削減するため、外因性脱窒菌バイオオーグメンテーション（DEN）戦略を評価。選定した菌株により高い脱窒速度を達成し、6つの下水処理場でC/N要求値を21-55%低減。実規模検証では、処理水TNを約10mg/Lに維持しつつ、単位TN除去あたりの外部炭素源コストを69.4%削減した。
English
This study evaluates exogenous denitrifying bioaugmentation (DEN) to reduce external carbon addition in low C/N municipal wastewater treatment. The inoculant achieved high denitrification rates, and across six WWTPs, the apparent C/N requirement decreased by 21-55%, reducing COD demand per TN removed. Full-scale validation at a 24,000 m3/d plant maintained effluent TN at ~10 mg/L and cut external carbon-source cost per TN removed by 69.4%.
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のエネルギー消費と薬品使用削減が課題であり、本技術は外部炭素源の削減によるコスト削減とGHG排出削減に寄与する可能性がある。ただし、日本の規制や処理方式との適合性は要検討。
In the global GX context
Globally, wastewater treatment contributes to greenhouse gas emissions and operational costs. This study offers a practical bioaugmentation approach to reduce external carbon dependency, aligning with sustainability goals in the water sector. The cost reduction metric provides a clear business case for adoption in various regulatory contexts.
👥 読者別の含意
🔬研究者:Provides insights into bioaugmentation efficiency and microbial community shifts for carbon-efficient nitrogen removal.
🏢実務担当者:Offers a validated method to reduce external carbon costs and improve nitrogen removal performance in WWTPs.
🏛政策担当者:Highlights potential for cost savings and environmental benefits in wastewater treatment, informing policy on sustainable infrastructure.
📄 Abstract（原文）
Low carbon-to-nitrogen (C/N) municipal wastewater often limits heterotrophic denitrification and increases external carbon addition. This study evaluated an exogenous denitrifying bioaugmentation (DEN) strategy for improving nitrogen removal per unit of external carbon added. The screened inoculant reached approximately 2.5 × 109 CFU/mL, and maximum nitrate and nitrite reduction rates of 307.42 and 215.42 g N/(m3 h), respectively, were achieved by the selected isolates. Among the tested carbon sources, the highest denitrification rate was obtained with sodium acetate. Across wastewater samples from six municipal wastewater treatment plants (WWTPs), the apparent C/N requirement was reduced from 2.79–9.41 to 1.92–5.20 by DEN addition, corresponding to a 21–55% decrease in chemical oxygen demand (COD) required per unit total nitrogen (TN) removed. During full-scale validation at a 24,000 m3/d WWTP, effluent TN was maintained at approximately 10 mg/L through startup and adaptive maintenance dosing, while specific denitrification rate (SDNR) was increased by approximately 2.3-fold. Activated-sludge community restructuring was indicated by 16S rRNA sequencing, with an increase in the relative abundance of Pseudomonadota from 18.4% to 27.6% after dosing. Based on external carbon-source expenditure, the specific external carbon-source cost per unit TN removed decreased from 0.036 to 0.011 Chinese Yuan (CNY)/(t water·mg TN), corresponding to a 69.4% reduction in this cost indicator. Overall, DEN bioaugmentation was shown to be a practical engineering tool for carbon-efficient nitrogen removal from low-C/N municipal wastewater.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.3390/w18172218first seen 2026-09-09 04:58:17
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