國內有害重金屬污泥每年產量約41萬公噸，傳統固化、掩埋方式處理已不合時宜，未來勢必朝向污泥資源再利用的方向發展，資源再生技術可分為重金屬與污泥的固定化或分離化兩類。本研究以EDTA重覆化學萃取之方式萃取污泥中之重金屬，並透過連續萃取法討論重金屬之結合型態的變異，最後對處理前後之污泥進行生物毒性試驗。

實驗用污泥取自皮革與印刷電路板業，重金屬主要存在於鐵錳氧化態與殘留態，碳酸鹽態亦佔有一定的比例，在此兩種污泥中，重金屬的結合型態分佈情況會依不同的類別之污泥而異。

化學試劑對重金屬的萃取實驗結果顯示，皮革業污泥以配置EDTA莫耳數比例五倍可得最佳之萃取效率，對於主要重金屬鉻而言，萃取效率可達54.39%，而在重覆化學萃取方面，莫耳數比例兩倍以萃取三次可得較佳之效果，其鉻的萃取效率達50.68%，莫耳數比例五倍以萃取兩次為較佳，莫耳數比例十倍時則以萃取兩次為較佳之結果，兩者對鉻的萃取效率則達62%；印刷電路板業污泥之萃取效率結果乃以配置EDTA莫耳數比例兩倍最為可行，對於主要污染重金屬銅其萃取效率達到83%，其在重覆化學萃取方面，以莫耳數比例兩倍而言，其萃取三次效果較好，其它比例的重覆萃取效率均遠較於其為低，其萃取效率達到93.29%。

在污泥之生物毒性試驗，發現種子之根系長度較發芽率的敏感性為高，在未處理組的污泥，因EC值過高，為抑制種子根系生長的主因。皮革污泥經過化學萃取處理後，有效降低重金屬全量與EC值，導致種子的根系生長情形較未處理組為佳；印刷電路板污泥經過EDTA處理後，因其EC值仍普遍偏高，所以相較於皮革業污泥種子生長情形則較差。

The production of hazardous heavy metal sludges in Taiwan has reached 410,000 tons per year. Sludge disposal methods of solidification and landfill is irrelevantly, but it must trend to reuse and recycle in the future. This research try to use chemical extraction to remove heavy metals from sludges and evaluate the influence of heavy metal combined forms by sequential chemical extraction on the extracted efficiency. At last, we used the root lengths and seed germinated rate to evaluate the biotoxicity of sludges before and after treatment.

Sludge sampled from leather and printed circuit board manufacturing industry. Heavy metals in sludges existed as the forms of Fe-Mn oxides fractions and residual fractions mostly, and the carbonate fractions also have stable proportion.
The results of sequential chemical extraction indicated that heavy metals fractions were significantly different in various kinds of sludge.

For the chemical extraction experiments, the results showed that the sludges of leather manufacturing industry use the five times of equivalent concentration of EDTA fraction get the better removal efficiency (54.39%).In the repetition of chemical extraction, it could get the best extracted efficiency (62%) in chromium. When we used five times of equivalent concentration of EDTA and repeat-extraction two times. The results of the sludge of printed circuit board manufacturing industry indicated it could get the best extracted efficiency in copper by using two times of equivalent concentration of EDTA and repeat-extraction three times.

The results of sludge biotoxicity evaluation showed that root elongation was more sensitive than seed germination. The root length growth of raw sludges were inhibited because higher EC values. After chemical extraction treatment, seed germination rate and root length growth in leather sludge were better that was because total metal concentrations and EC values decreased; In the sludges of printed circuit board industry, the seed germination rate and root length growth worse cause by EC values common higher.

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