利用穩定同位素探討地下水中氮化合物轉化及氮污染溯源先期研究-以雲林農業區地下水為例
| 中文摘要 | 本先期研究計畫以雲林農業區地下水為研究對象，探討氨氮及硝酸鹽氮的來源及轉換機制。計畫內容包含地下水中氮議題案例蒐集與分析、含氮關切地區篩選及調查、氮類來源與轉換機制研究，以及氣候變遷對地下水品質的潛在影響。研究方法包括同位素資料解析、地下水污染傳輸模型及機器學習演算法等，並透過專家會議完善方法論。計畫結果指出，雲林地區地下水中氨氮與硝酸鹽氮濃度偏高。大屯地區地下水主要受到雨水、畜牧放流水與生活排水混合補注，而氨氮δ15N特徵顯示氮污染來源為肥料施用、沼渣沼液灌溉及生活排水混合所致；此外，土壤調查結果顯示有氨揮發、氨固定化作用以及異化硝酸鹽轉換為銨鹽等轉換機制的同位素科學證據。六合地區地下水主要由雨水、灌溉給水及生活排水補注，硝酸鹽氮來源除氮肥施用外，亦包括土壤有機氮轉換為硝酸鹽的貢獻，並提供硝化及脫硝作用的同位素證據。此外，計畫亦探討氣候變遷對地下水品質的影響，涉及碳捕存、地熱開發及海水入侵等議題，並提出初步因應對策。研究建議包括建立臺灣本土同位素資料庫、引進同位素前處理與分析技術、擴大同位素應用範疇，及制定氣候變遷影響因應計畫，以提升地下水污染治理與環境管理能力。 | ||
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| 中文關鍵字 | 同位素分析、氮化合物轉換機制、地下水氮化合物來源研析 | ||
基本資訊
| 專案計畫編號 | 經費年度 | 113 | 計畫經費 | 9050 千元 | |
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| 專案開始日期 | 2024/02/23 | 專案結束日期 | 2024/12/31 | 專案主持人 | 朱順傑 |
| 主辦單位 | 國環院環境治理研究中心 | 承辦人 | 何建仁 | 執行單位 | 業興環境科技股份有限公司 |
成果下載
| 類型 | 檔名 | 檔案大小 | 說明 |
|---|---|---|---|
| 期末報告 | 113FA023(不含附錄)_去.pdf | 28MB |
Preliminary Study on the Transformation of Nitrogen Compounds in Groundwater and Nitrogen Pollution Source Tracing Using Stable Isotopes: Two Case Studies of Groundwater in Yunlin Agricultural Area
| 英文摘要 | This preliminary research project focuses on the groundwater of the agricultural regions in Yunlin, investigating the sources and transformation mechanisms of ammonium nitrogen (NH₄⁺-N) and nitrate nitrogen (NO₃⁻-N). The project includes two case studies on nitrogen-related issues in groundwater, selection and investigation of nitrogen-affected areas, studies on nitrogen sources and transformation mechanisms, and assessments of the potential impacts of climate change on groundwater quality. The research methods involve isotopic data analysis, groundwater contamination transport modeling, and machine learning algorithms, refined through expert consultations. The findings highlight elevated concentrations of NH₄⁺-N and NO₃⁻-N in Yunlin's groundwater. In Datun, groundwater is primarily recharged by a mix of rainwater, livestock wastewater, and domestic wastewater. The δ¹⁵N signature of NH₄⁺-N indicates that nitrogen pollution originates from a combination of fertilizer application, digestate irrigation, and domestic wastewater. Soil investigations provide isotopic evidence for ammonia volatilization, immobilization and dissimilatory nitrate reduction to ammonium (DNRA) processes. In Liuhe, groundwater recharge sources include rainwater, irrigation water, and domestic wastewater. The NO₃⁻-N in groundwater is derived not only from nitrogen fertilizer applications but also from the conversion of soil organic nitrogen into nitrate, with isotopic evidence supporting both nitrification and denitrification processes. The study also examines the potential impacts of climate change on groundwater quality, addressing issues such as carbon capture and storage, geothermal development, and seawater intrusion, and proposes initial mitigation strategies. The research recommendations include establishing a Taiwan-specific isotopic database, introducing isotopic pre-treatment and analysis technologies, expanding the scope of isotopic applications, and developing response plans for climate change impacts. These measures aim to enhance groundwater pollution control and environmental management capabilities. | ||
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| 英文關鍵字 | Isotope Analysis, Nitrogen compounds conversion mechanisms, Tracing of nitrogen compounds in groundwater | ||