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EPA-99-GA103-03-A236-19

099

990 千元

2010/12/31

2011/12/30

王永福

土污基管會

尤衍翔

國立成功大學

土壤及地下水

微生物電化學反應牆

bioelectrochemical permeable reactive barrier

郭明錦

王永福

06-3840136#214

yfwang@mail.ncku.edu.tw

苯(benzene)、甲苯(toluene)、乙苯(ethylbenzene)與對二甲苯(xylene) (簡稱BTEX)普遍存在汽油污染的地下水中，且隨著地下水的流動，污染的範圍也隨之擴大。傳統處理方式需耗費大量動力自地下抽出污染物質或注入過氧化劑以利污染物質之氧化，各種方法中生物處理方法被認為最符合經濟效應，其中生物反應牆常被用來防止汙染物質的擴散，但氧化物質(最終電子接受者)的順利提供，依然是生物反應牆在實際整治過程中最大的瓶頸。 根據先期研究發現，以電極為電子接受者，在無氧的環境下，微生物可以持續進行苯的氧化反應。後續進一步在模擬土壤管柱中(反應層約15 cm)，利用實際土壤微生物作為植種菌源，在特定電壓的施加下，以電極為最終單一電子接受者，進行BTEX生物降解研究，初步發現微生物對BTEX有極佳的降解率(95%以上)，此重要結果有利於開發一微生物電化學反應牆。為使此反應牆更趨實用，本計劃將進行實際現地模廠規模(Pilot study)驗證，探討在不同停留時間、不同施加電壓與不同反應層深度下之各物質降解、中間產物累積與相關微生物分布情形。

微生物電化學反應牆

期末報告可公開.pdf

1MB

2012/2/1 上午 12:00:00

Benzene, toluene, ethylbenzene and xylenes isomers (BTEX) exist widely in the groundwater contaminated by gasoline and are spread by the groundwater flow. Traditional remediation methods of physical (Pump and treat) or chemical (chemical oxidation) techniques are generally costly. Biological approaches for treating BTEX in the contaminated groundwater appear to be economical and environmental friendly processes, but supply of final electron acceptors for the microbe efficiently is still a strict problem. In our previous study, it was revealed that an electrode at a given potential could be the final electron acceptor for benzene biodegradation under anaerobic conditions. Further, the soil columns (reaction zone were 15 cm) were constructed to study the biodegradations of BTEX with carbon fiber electrode as the sole electron acceptor. The degradations of BTEX were more than 95%. This result is useful for the development of bioelectrochemical permeable reactive barrier. In order to promote this useful barrier to the on-site application in the near future, some useful parameters, such as the suitable value of applied potential for the electrode, hydraulic retention time, the efficiencies of BTEX biodegradation, and the microbial communities within the carbon fiber electrode will be organized in this pilot scale study on bioelectrochemical permeable reactive barrier.

bioelectrochemical permeable reactive barrier