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農業稲わら由来の徐放性炭素源が人工湿地における低C/N廃水の脱窒を促進する

Agricultural Straw-Derived Slow-Release Carbon Sources Enhance Denitrification of Low C/N Wastewater in Constructed Wetlands (原題)

Dapeng Liu, Yadong Xie, Mawuli Dzakpasu, Qionghua Zhang

Water📚 査読済 / ジャーナル2026-10-23#その他Origin: CN経営インパクト: コスト削減対象セクター: water_utilities
DOI: 10.3390/w18212644
原典: https://doi.org/10.3390/w18212644

🤖 gxceed AI 要約

日本語

アルカリ改質した葦・トウモロコシわらをPBSおよび不活性骨材と複合化し、徐放性炭素源を開発した。トウモロコシわら系（AA−CC5）が最良の炭素放出バランスを示し、回分試験で硝酸除去率97.7%を達成。連続流人工湿地では全窒素・硝酸除去率がそれぞれ19.5%・16.5%向上し、脱窒関連菌属の相対存在量増加も確認された。

English

Biomass-derived slow-release carbon composites were made by coupling alkali-modified reed or corn straw with PBS and inert skeletal materials. The corn straw composite (AA−CC5) gave the best carbon-release balance, reaching 97.7% nitrate removal in batch tests and raising TN and nitrate removal by 19.5% and 16.5% in continuous-flow constructed wetlands treating low C/N tailwater. Denitrification-associated genera increased, supporting straw-derived composites as supplementary carbon sources.

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

下水処理水の高度処理・窒素管理は水環境規制対応の実務課題であり、農業副産物の有効利用は資源循環の観点で日本企業の環境技術開発にも示唆がある。ただし炭素会計や開示制度との直接の接続は薄い。

In the global GX context

Adds to the global literature on nature-based and low-energy nutrient removal for wastewater, relevant to water-quality regulation and circular use of agricultural residues, but with limited direct linkage to climate disclosure frameworks.

👥 読者別の含意

🔬研究者:農業バイオマス複合材料の炭素放出動態と微生物群集応答の設計指針として参考になる。

🏢実務担当者:下水・排水処理施設での炭素源補給コストや窒素規制対応の選択肢として検討材料になる。

🏛政策担当者:水質窒素規制と農業廃棄物再利用政策の接続を考える際の技術的根拠になりうる。

📄 Abstract（原文）

Low carbon-to-nitrogen (C/N) tailwater from wastewater treatment plants severely constrains denitrification in constructed wetlands, yet sustainable external carbon supplementation remains a major challenge. Herein, we developed a series of biomass-derived slow-release carbon composites by coupling alkali-modified reed or corn straw with polybutylene succinate (PBS) and inert skeletal materials, and systematically evaluated their carbon-release behavior, nutrient-leaching risks, structural evolution, and denitrification performance. Corn straw-based composites exhibited substantially higher carbon availability and more favorable release kinetics than reed-based counterparts. Among the tested materials, AA−CC5 (corn straw:PBS = 10:2) achieved the optimal balance between sustained carbon supply and release control. In batch denitrification tests, AA−CC5 enabled rapid nitrate removal with a peak NO3−-N removal efficiency of 97.7% while suppressing excessive nitrite accumulation. When integrated into continuous-flow constructed wetlands treating tailwater at an influent C/N of 0.4, AA−CC5 increased average total nitrogen and nitrate removal efficiencies to 19.5% and 16.5%, respectively. High-throughput sequencing showed higher observed relative abundances of several genera commonly associated with denitrification, including Pseudomonas, Paracoccus, and Dechloromonas, in the AA−CC5 wetland. These community patterns were consistent with the additional organic carbon supplied by AA−CC5. These findings suggest that agricultural straw-derived composites have potential as supplementary carbon sources for carbon-limited constructed wetlands.

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