下水污泥病原菌大腸桿菌之偵測及處理

Detection and Treatment of Escherichia coli in Sewage Sludge

李宜樺(YI-HUA LEE)

指導教授 ： 王順成

朝陽科技大學/理工學院/環境工程與管理系/碩士(2017年)

摘要

隨著人口增加其污泥量也隨之增加，亦使污泥回收再利用議題倍受重視，若能將污泥妥善規劃與處理，例如應用於農業用地作為堆肥、土壤改良劑等，除可改善土壤性質亦可一併處理廢棄污泥，但污泥中可能含有病原菌(如：大腸桿菌、沙門氏菌等)及重金屬(砷、鎘、鉻、汞、銅、鎳、鉛、鋅)等危害人體健康之物質，若將其直接施用在農業用地，可能造成人類健康之威脅。目前台灣尚未有完整污泥病原菌之偵測方法，本研究參考並修正前處理之國外污泥中大腸桿菌之偵測方法，建立台灣污泥大腸桿菌偵測方法。以此法評估污泥處理前後大腸桿菌菌量之變化，以瞭解處理方法之有效性，藉此減少污泥再利用之安全疑慮。試驗結果顯示三間水資源回收中心處理前之污泥，大腸桿菌量均超過USEPA及EU所規定之標準，經高溫120ﾟC短時間10分鐘處理後污泥大腸桿菌量均合於規定，顯示此處理之方式可有效降低大腸桿菌量。另外，重金屬部分分析結果顯示，三間水資源回收中心之重金屬濃度皆超過危害之標準，若要施用於農田用地，這部分需加入更有效去除重金屬處理方式，以避免對環境及人體造成危害。

關鍵字

污泥再利用 ； 大腸桿菌

並列摘要

The amount of sewage sludge generated with increase of the size of human society. The recycle use of sewage sludge had become an important issue in worldwide and Taiwan. Sewage sludge can be processed to fertilizer or soil modifier to improve agriculture lands. However this may face a great risk as sewage sludge may contained pathogens such as Escherichia coli, Salmonella, or other toxic substance such as heavy metals, environmental hormones and be harmful to human health and environment.
Currently there is no well set detecting method in Taiwan for the monitoring of sewage sludge pathogens. In this research, we developed a whole set method to detect the E. coli in sewage sludge and also measured the efficacy of killing E. coli with autoclave. The E. coli density in sewage sludge sampled from three sewage recycling plant in Taichung City exceeded the standard density of E. coli in fertilizer made from sewage sludge required by USEPA and EU, but dropped to very low, fulfilled the requirement of USEPA and EU, after sterilized with an autoclave at 120°C for 10 min. However we did not find effective method to reduce heavy metals in swage sludge. Further studies are needed to enhance the technology in removing heavy metal in sewage sludge for agricultural field use and avoid the harmful risk of heavy metals to human being.

並列關鍵字

sludge reuse ； Escherichia coli

參考文獻

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