二種復育系統對地下水含氯有機化合物污染整治研析：以桃園RCA場址為例

Abstract

近幾年來，國內地下水受含氯有機化合物污染的事件，時有傳聞，桃園RCA場址即為其中一典型案例。本文利用一個三維污染物含生物性分解的傳輸模式結合地下水流模式3DFATMIC程式，配合斗牆與阻門系統（funnel and gate system），以桃園RCA場址為對象，模擬分析PCE、TCE污染物分佈情形，並在阻門內加入零價鐵與零價鋅作為還原劑，以分解PCE、TCE污染物。模擬結果顯示，經過兩年處理後，RCA場址下游監測井(TM-601, TM-602, and TM-603)最終濃度降為原抽取處理法的0.02﹪，且遠低於40 ppb。顯示斗牆與阻門系統能較有效地處理地下水中PCE、TCE等污染物。

The events of groundwater contamination due to chlorinated organic chemicals have been known for several years in Taiwan. The RCA Taoyuan site is one of the typical cases. In this thesis, the 3DFATMIC model was employed to simulate the concentration distribution of PCE and TCE. A funnel and gate system, which adopts granular zero-valent iron and zero-valent zinc in the gate, is chosen to replace the pump and treat method for remediationg the RCA Taoyuan site. The simulation results from 3DFATMIC indicate that the final concentrations of PCE and TCE in downstream monitoring wells reduce to about 0.02 ％ of those when using pump and treat method after two years. Accordingly, the funnel and gate system may be a better choice over the pump and treat method to remove the dissolved chlorinated organic chemicals, such as PCE and TCE, at RCA Taoyuan site.