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EPA-99-U1U4-04-002

099

2,500 千元

2010/05/18

2010/12/15

高志明

永續發展室

林燕柔

冠誠環境科技工程股份有限公司

土壤及地下水

乳化型釋氫基質;透水性反應牆;地下水污染;三氯乙烯

slow hidrogen releasing material;permeable reactive barriers;contaminated groundwater;trichloroethene

葉琮裕

郭育嘉

07-5252000#4419

D983030006@student.nsysu.edu.tw

含氯有機溶劑常被廣泛應用於脫脂、電子零件清洗及乾洗等工業製程中，一旦發生三氯乙烯洩漏，將可能經由飲用水等多種暴露途徑，對鄰近民眾之健康造成嚴重危害。本研究將本團隊所研發之乳化型釋氫基質結合透水性反應牆之概念，注入現地受三氯乙烯(trichloroethene, TCE)污染之地下水中，並評估其乳化型釋氫基質對於TCE降解之可行性，以提供未來整治含氯有機物場址之參考。研究中所設計合成之基質結合大豆油或乳酸鹽及生物可分解界面活性劑(Simple Green及卵磷脂)配方加以改良，使大豆油(或乳酸鹽)乳化為較易擴散之乳化型釋氫基質且能達到乳化效果90%以上，以期長期提供微生物還原脫氯所需之碳及氫源。本計畫選擇一TCE污染場址進行現地模場試驗，由場址調查結果可知注入之基質將可形成透水性反應牆，以防止污染源向下游傳輸擴散；監測結果亦顯示TCE濃度降低至符合法規標準，下游監測井測得TCE被微生物分解之副產物順1,2-二氯乙烯(cis-1,2 DCE)及氯乙烯(VC)。本研究成功利用乳化型釋氫基質結合透水性反應牆於現地模場試驗，且配製之乳化型釋氫基質為良好緩釋性物質，且具有長時效供應現地微生物生長之營養鹽，因此可省去經常灌注之經費及降低所有整治執行的環境影響，並可減少碳足跡排放，且符合綠色整治概念，以提供未來相關整治場址之參考依據。

乳化型釋氫基質;透水性反應牆;地下水污染;三氯乙烯

公開版.pdf

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2011/3/1 上午 12:00:00

Chlorinated solvents are commonly used for degreasing of electronic parts and drying cleaning industries. When they are released into the subsurface, they tend to adsorb onto the soils and cause the appearance of DNAPL (dense-non-aqueous phase liquid) pool. Among those halogenated organic compounds, trichloroethylene (TCE), a human carcinogen, is one of the commonly observed contaminants in groundwater. TCE will become hazardous to human health through drinking water exposure routes. In this study, TCE was used as the target compound, and green remediation technology was developed to remediate DNAPL polluted groundwater. The objective of this study was to develop the emulsified hydrogen releasing substrate and apply it in the permeable reactive barrier for TCE-contaminated groundwater cleanup. Results will be used for future practical application. In this study, the developed emulsified hydrogen releasing substrate contained soy bean oil , lactate , biodegradable surfactant (Simple Green: 5 w/w% and lecithin 20 w/w%), and nutrients (amino acids, trace elements, and vitamin). The emulsified hydrogen releasing substrate is able to provide carbon and hydrogen for bacterial growth. In the injection well A, the TCE concentration dropped to below 0.01 mg/L. Degradation byproducts for cis-1,2-dichloroethene and vinyl chloride. Results reveal anaerobic dechlorination is feasible and applicable technologies to clean up TCE contaminated aquifers. Thus, the in situ bioremediation technology has the potential to be developed into an environmentally, economically and naturally acceptable remediation technology. Knowledge obtained from this study will aid in designing a hydrogen-released substrate biobarrier system for site remediation.

slow hidrogen releasing material;permeable reactive barriers;contaminated groundwater;trichloroethene