過硫酸鹽氧化法結合厭氧生物復育法整治受三氯乙烯污染地下水之可行性評估

Feasibility study on the remediation of trichloroethylene (TCE)-contaminated groundwater using persulfate oxidation coupled with anaerobic bioremediation

林韋翰(Wei-Han Lin)

指導教授 ： 陳谷汎

國立暨南國際大學/科技學院/土木工程學系/碩士(2015年)

摘要

本研究以整治列車的概念，結合過硫酸鹽及厭氧生物復育法處理受三氯乙烯污染之地下水。整治列車系統先以過硫酸鹽降解高濃度之三氯乙烯，再以長效型厭氧生物復育試劑持續整治低濃度之三氯乙烯，最後以過硫酸鹽釋放物質於地表下長期釋放過硫酸鹽，持續將殘餘之三氯乙烯、二氯乙烯及累積之氯乙烯去除。在本研究中，我們採集一個三氯乙烯污染場址之土壤及地下水進行批次及管柱實驗。批次實驗結果顯示，1-5%過硫酸鹽添加，可於1天內迅速降解高濃度三氯乙烯(50 mg/L)，0.5%之過硫酸鹽亦可於4天內將三氯乙烯完全去除。以二價鐵活化過硫酸鹽去除污染物時，可能因過硫酸鹽迅速消耗，造成污染物之殘留。濃度2%以上之過硫酸鹽，對微生物之抑制極為顯著。微生物批次實驗結果顯示，0.5%商業化厭氧生物復育試劑Eco-Clean之添加，即可加速TCE之厭氧還原脫氯。高濃度硫酸鹽(5%)之存在，並不影響Eco-Clean對TCE之厭氧還原脫氯。分子生物技術分析結果顯示，場址中存在具有完全脫氯能力之菌種。管柱實驗結果顯示，在0.5%過硫酸鈉， 1% Eco-Clean條件下，配合釋過硫酸鹽物質使用之整治列車，於每階段處理程序皆可順利銜接，並無氧化還原條件衝突之問題，可有效去除TCE及其降解副產物。此外，使用過硫酸鹽整治受污染地下水時，應定期檢測地下水中重金屬濃度，避免二次污染發生。研究結果顯示，本研究所提之整治列車，應為一可行之整治方式，惟後續仍需以現地模場試驗進行驗證，以修正相關操作參
數。本計畫之成果，將可發展一套迅速有效之化學氧化結合生物復育之整治列車，供相關污染場址整治之應用。

關鍵字

三氯乙烯 ； 整治列車 ； 過硫酸鹽 ； 厭氧生物復育試劑 ； 釋氧化劑物質

並列摘要

In this study, a treatment train composed of chemical oxidation and anaerobic bioremediation was applied to remediate trichloroethylene (TCE)-contaminated groundwater. Soil and groundwater collected from a TCE-contaminated site were used for batch and column experiments. The treatment train used in this study consisted of persulfate oxidation, anaerobic bioremediation reagents, and persulfate release materials. Results of batch experiments show high concentrations of TCE (50 mg/L) could be removed rapidly by 1 to 5% persulfate addition during 1 day of reaction. The addition of 0.5% persulfate could also oxidize TCE completely during a 4-day reaction. Ferrous ion-activated persulfate may cause the residual of TCE due to the rapid consumption of persulfate by ferrous ions. Significant inhibition of soil bacteria was observed with the addition of persulfate higher than 2%. Results of microcosm study reveal dechlorinating bacteria were present at the site. The addition of 0.5% the commercial anaerobic bioremediation reagent, Eco-Clean, could enhance the dechlorination of TCE effectively. No significant effects on TCE removal were observed with thepresence of high concentrations of sulfate (5%). The results show the proposed treatment train would be feasible for groundwater remediation. However, field pilot study needs to be conducted to further evaluate the effectiveness of the treatment train on field applications.

並列關鍵字

Trichloroethylene (TCE) ； treatment train ； persulfate ； anaerobic bioremediation reagent ； oxidant release material

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