現地化學氧化法整治受汽油污染之地下水案例經驗評析

Remediation of gasoline contaminated groundwater by in-situ chemical oxidation

蘇一哲(I-Jer Su)

指導教授 ： 林鎮洋

國立臺北科技大學/工程學院/環境規劃與管理研究所/碩士(2006年)

https://doi.org/10.6841/NTUT.2006.00063

摘要

本研究探討以現地化學氧化法 (in-situ chemical oxidation, ISCO)之Fenton’s試劑處理汽油中苯、甲苯、乙苯、二甲苯(benzene、toluene、ethylbenzene、xylenes，BTEX)污染地下水之實際案例，經由相關文獻資料、整治原理、去除效率、現場整治案例成效及成本等進行評析，以更清楚掌握其優點、限制及最佳之施用方法，做為國內相關人員在經濟效益及污染整治時程上考量，評估該污染整治操作技術之應用參考。
現地化學氧化法 (ISCO) 整合空氣曝氣法(AS) 及土壤氣體抽取法(SVE)系統為一項創新的技術，而國內現階段之整治案例，廠商為節省成本考量化學氧化劑注入方式係以重力式注入為主。就本研究現有之案例顯示在水力傳導係數為≧10-4cm/s及地下水中苯濃度＜750ppb之整治場址，僅以空氣曝氣法（AS）及土壤氣體抽取法（SVE）之整合系統整治案例與現地化學氧化法 (ISCO) 之Fenton’s試劑整合空氣曝氣法（AS）、土壤氣體抽取法（SVE）之整治案例比較，兩者所需整治時程差距不大。
對於早期發現加油站洩漏所造成小區域之汽油污染整治案，為考量整治期限能夠縮短,以全部挖除污染土壤換土後，再以現地化學氧化法(ISCO)整合空氣曝氣法(AS) 及土壤氣體抽取法(SVE) 系統整治汽油污染之地下水，其在經濟效益及污染整治時程上，是有其優勢之整治法；若考量水源區之水質保護及環境敏感區域時,是否需以化學氧化法進行地下水整治,實有必要審慎為之。

關鍵字

現地化學氧化法 ； Fenton’s試劑 ； BTEX ； ISCO ； 空氣曝氣法 ； AS ； 土壤氣體抽取法 ； SVE

並列摘要

This research discussed the treatment of the Fenton's agent of the in-situ chemical oxidation (ISCO) on contaminated groundwater polluted by benzene, toluene, ethylbenzene, and xylenes (BTEX) released from gasoline. The above treatment was evaluated by virtue of the literature review, principle of remediation, removal efficiency, real remediation cases and cost in order to clearly understand its merit, constraints, the best way to implement and to provide the domestic practitioners for assessing the remediation technique considering the economic benefit and the remediation schedule.
The integration of the in-situ chemical oxidation (ISCO), the air sparging (AS) and soil vapor extraction (SVE) is an innovative technology. However, as the domestic remediation cases are concerned, the local contractors use gravitational injection to inject chemical oxidants in order to save cost. The present research found that the difference of the remediation schedule between the cases treated by the integrated AS and SVE and those treated by the integrated Fenton’s agent of the ISCO, AS and SVE is not significant in the remediation site with hydraulic conductivity ≧ 10-4cm/s and benzene concentration < 750ppb in groundwater.
Regarding the remediation cases of the early discovered gasoline leakage from the gas station, in order to shorten the remediation period, the polluted soil was first completely removed and exchanged, then the polluted groundwater was treated by the integrated ISCO, AS, and SVE technology. The above remediation method is deemed favorable as the economic benefit and remediation schedule are concerned. However, it should be cautious about whether or not treating the groundwater by the chemical oxidation when considering the water quality protection of the water resource and environment sensitive region.

並列關鍵字

in-situ chemical oxidation (ISCO) ； BTEX ； air sparging (AS) ； soil vapor extraction (SVE)

參考文獻

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