堆肥過程含氮化合物含量與氧化亞氮釋放之動態關係

Dynamic Relationships between Nitrogenous Compounds Levels and Nitrous Oxide Emission during Composting

許皓豐(Hau-Feng Hsu) ； 黃大駿(Da-Ji Huang) ； 王淑音(Shu-Yin Wang)

《華岡農科學報》 12期 (2003/12) Pp. 13-25

摘要

堆肥製作過程為家禽產業主要釋放溫室氣體之來源。本研究之目的為藉由測量追蹤堆肥各階段所排放之氧化亞氮與有機質、總凱氏氮、銨態氮、硝酸態氮、亞硝酸態氮之含量，以尋求含氮化合物與氧化亞氮的動態關係及降低氧化亞氮釋出之有效解決方案。本研究配合受檢測堆肥場之處理流程，進行氧化亞氮釋出及堆肥中含氮物質分析。結果顯示，在堆肥製作之堆置後期至發酵後期中，均可發現反應物與生成物有明顯的拮抗情形，如銨態氮與亞硝酸態氮、亞硝酸態氮與硝酸態氮、硝酸態氮與氧化亞氮之間，均呈明顯之相互消長情形，而這情形也類似土壤中之氮素循環。經由堆肥中氮素消長情形推論，增加翻堆次數或通氣量應可增加堆肥中含氧量，可促進堆肥熟成及抑制氧化亞氮生成。另一方面並發現，堆肥pH值與氧化亞氮生成有明顯相關，故推論控制堆肥pH值有助於堆肥熟成，亦可抑制氧化亞氮生成。因此，如果適量增加堆肥中含氧量及控制pH值應可抑制堆肥製程中所釋出的氧化亞氮。

關鍵字

堆肥 ； 含氮物質 ； 氧化亞氮 ； 動態關係

並列摘要

The purpose of this study was to investigate the dynamic relationships between nitrogenous compounds and nitrous oxide (N2O) emission during composting in order to search for a solution for reducing the greenhouse gas emission. N2O and other nitrogenous compounds were analyzed in coordination with the fermentation process of testing composting factory. Results indicated that an inverse relationship in concentrations of (NH4+)-N and (NO2-)-N, (NO2-)-N and (NO3-)-N, (NO3-)-N and N2O-N were observed during the fermentation period. In addition, pH value of the compost was positively correlated with the N2O emission from the composting process. Results of the study suggested that control of the optimal acidity of compost and/or increasing the turning process should be an effective way to reduce N2O emission.

並列關鍵字

compost ； nitrogenous compounds ； nitrous oxide ； dynamic relationship