高氮排都市氮元素流分析：以臺北市為例

Substance Flow Analysis of Nitrogen in a High-Emission Urban Area: A Case Study of Taipei, Taiwan

李崇恩(Chong-En Li) ； 郭乃文(Nae-Wan Kuo)

《中華水土保持學報》 53卷1期 (2022/03) Pp. 54-65

https://doi.org/10.29417/JCSWC.202203_53(1).0006

摘要

高氮排都市對全球生態的嚴重影響值得深入討論，本文以臺北市（淡水河系流域部分）為研究區，利用都市代謝的概念執行該區域的氮元素流分析，範疇包含空域、陸域、水域三個子系統，依此計算各個來源在排放到出海口的總氮量之中所佔的比例，並根據研究結果討論減排的方法。研究結果可以觀察到：一、臺北市人類活動向大氣排放的通量大於沉降的通量；二、都市農業存在氮肥與飼料並未有效轉換成食物的問題；三、多數含氮廢水被雨水抽水站和溪溝接收後直接排放到河水中，而沒有經過污水處理系統；四、陸域子系統向河水排放的氮通量大於向大氣排放的氮通量；五、應透過都市合作降低排放到河口的總氮量。本文的研究方法與結果期待可以作為後續研究其他高度排放都市的參考，共同努力改善全球氮污染現況。

關鍵字

廢水 ； 空氣污染 ； 都市代謝 ； 元素流分析 ； 臺北市

並列摘要

The potential risks of high-nitrogen-emitting cities to the global ecology are worthy of in-depth study. This study employed the concept of urban metabolism to construct a nitrogen-flow analysis framework for the Tamsui River watershed region of Taipei, Taiwan, that encompassed three subsystems: atmosphere, land, and water. The proportion of the total nitrogen discharged to the sea was calculated, and emission reduction methods were discussed. Five conclusions were drawn from the study. First, the flux emitted by human activities into the atmosphere in Taipei was greater than that resulting from deposition. Second, some nitrogen fertilizers and feeds in urban agriculture were not effectively converted into food. Third, most nitrogen-containing wastewater was received by rainwater pumping stations and discharged into river water without passing through sewage treatment plants. Fourth, the nitrogen flux discharged into river water by the land subsystem was greater than that discharged into the atmosphere. Finally, the total amount of nitrogen discharged to the estuary should be reduced through urban cooperation. The methodology and results of this study may be applicable to follow-up studies on other high-nitrogen-emitting cities and research aiming to alleviate global nitrogen pollution.

並列關鍵字

wastewater ； air pollution ； urban metabolism ； substance flow analysis ； Taipei

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