以生物碳/過硫酸鹽混合藥錠處理受三氯乙烯污染之地下水

三氯乙烯(Trichloroethylene, TCE)為地下水中具有毒及持久性之有機污染物，是世界各地長期之環境問題，有效處理受污染之含水層面臨著許多困境，因此本研究以生物碳（竹炭）結合過硫酸鹽氧化法製作對環境無負擔之新型綠色整治藥錠，利用控釋氧化劑物質及生物碳活化過硫酸鹽之新型技術，處理受三氯乙烯污染之地下水。本研究主要目的包含：(1) 評估不同黏合劑之控釋氧化劑能力；(2) 探討竹炭結合過硫酸鹽整治藥錠之控釋氧化劑能力；(3) 探討不同數量之整治藥錠釋放過硫酸鹽之濃度及時間；及(4) 探討各種整治藥錠對三氯乙烯之去除能力。　　本研究所使用之三種黏合劑中，控釋效果最佳者為A纖維素，於整治藥錠去除TCE之機制中，無去除三氯乙烯之效果，僅提供賦形之功用，且A纖維素與水接觸後經溶脹作用形成水凝膠之特性，使其成為良好的控釋材料，達到控釋氧化劑之目的。以竹炭結合過硫酸鹽之整治藥錠，對於三氯乙烯之去除率高達99 %，除了經由竹炭活化過硫酸鹽，使其具有更佳的氧化能力之外，竹炭本身之吸附能力，亦會增加其整體之去除效率，本研究改善了其他活化氧化劑技術之侷限性問題，使其成為具發展性之整治有機污染場址的新技術。

關鍵字

三氯乙烯；過硫酸鹽；竹炭；黏合劑；現地化學氧化法

並列摘要

Trichloroethylene (TCE) was one of the most toxic and persistent organic pollutant in groundwater. There are a lot of barriers on the way of remediating polluted aquifer. In this study, bamboo charcoal was used coupled with persulfate oxidation to synthesize a new type of remediation tablet that was friendly to the environment. A new technology combined with controlled-release oxidant (CRO) and biochar-activated persulfate was developed for the remediation of TCE- contaminated groundwater. The main subjects of this study were to: (1) evaluate the ability of different binders to control the release of persulfate; (2) evaluate the ability of bamboo charcoal-CRO to control the release of persulfate; (3) evaluate the effect of tablet numbers on the concentration and time of persulfate release; and (4) evaluate the removal efficiency of TCE by the developed CROs. 　　The results show that A cellulose had the best performance for the control of persulfate release. A cellulose alone did not remove TCE. The function A cellulose was to form the shape of the tablets and after A cellulose contacted with water, its characteristic of forming hydrogel allowed it to become a good controlled-release material. TCE removal reached 99 % by the remedial tablets of bamboo charcoal coupled with persulfate. TCE was treated by the charcoal-CRO tablets via adsorption and persulfate activation by charcoal that enhanced the removal of the pollutant.