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EPA-96-040-0-5

097

2,514 千元

2007/11/19

2008/09/18

王鴻博

永續發展室

林燕柔

國立成功大學創新育成中心

土壤及地下水

奈米零價鐵, 粒徑分佈, 地質化學參數, 重質非水相液體, 含氯揮發性有機物及現地整治

Iron nanoparticles, size distribution, geochemical parameters, DNAPLs, chlorinated volatile organic carbons, and in situ remediation

孫元邦

孫元邦

06-2360524

yp.sun2006@msa.hinet.net

本計畫是以自製高分散性奈米鐵進行現地場址整治試驗，並從奈米鐵之特性(例如，粒徑分佈、表面電荷)、地質化學參數 (pH、ORP、EC及DO)及傳輸影響半徑等評析現地整治成效。自製界面活性劑配方(CSF-1)可合成平均粒徑大小~20 nm的高分散性奈米鐵，界達電位顯示其表面帶負電性（=-1.39 mv），適合在普遍帶負電的土壤地下水介質中傳輸。 小規模整治試驗於北部某地下水受含氯揮發性有機物污染之場址進行，分散性奈米鐵展現出良好之傳輸效應，使地下水之氧化還原電位(ORP)產生顯著的變化，同時溶氧(DO)亦降低為零，形成極有利於厭氧還原脫氯反應的環境條件，目標污染物(PCE, TCE)顯示＞95%之清除效率。微量順-1,2-二氯乙烯產生(<8 ppb)，證明奈米鐵大部分以β-elimination的反應途徑進行外，也同時進行hydrogenolysis反應途徑，此外，未偵測到氯乙烯(VC)的產生。

奈米零價鐵, 粒徑分佈, 地質化學參數, 重質非水相液體, 含氯揮發性有機物及現地整治

081028 期末報告_公開版_.pdf

1MB

[期末報告]公開版

2009/2/1 上午 12:00:00

This project was to conduct a pilot-scale field test using well-dispersed iron nanoparticles synthesized in the laboratory. Evaluation of the field test results was mainly based on the properties of the injected iron nanoparticles (i.e., size distribution, surface charge), geochemical parameters (i.e., pH, ORP, EC and DO), and influenced radius. Surfactant solution (CSF-I) was used to disperse iron nanoparticles. CSF-I can effectively reduce the size from 66 to 20 nm and provide negative charge to the surface of iron nanopartices. The zeta potential of -1.39 mv was favorable to the transportation of ion nanoparticles in the soil and groundwater environment. The projected site, whose groundwater was mainly contaminated with PCE and TCE, is located in the northern part of Taiwan. The prepared nanoiron was separately injected by gravity into the groundwater. The dispersed iron nanoparticles showed an obvious effect of transport in the groundwater that had a significant change of ORP and DO drop down to zero, suggesting an occurrence of the dechlorination reaction. Concentrations of targeted compounds (PCE and TCE) were reduced by at least 95%, which mostly was expected to be through the reaction path of β-elimination (>70%). A very small amount of cis-1,2-DCE (<8 ppb) was detected during the test, suggesting a different reaction path (i.e., hydrogenolysis) would take place simultaneously. Moreover, no vinyl chloride (VC) was detected.

Iron nanoparticles, size distribution, geochemical parameters, DNAPLs, chlorinated volatile organic carbons, and in situ remediation