| 摘要: | 近年來國內陸續發生彰化地區戴奧辛鴨蛋事件、高雄市大坪頂與彰化段台61線非法棄置案及台南中石化安順廠週邊土壤受戴奧辛污染等事件，土壤及地下水污染議題再度受到民眾與環保單位高度的關切與重視。其中，中石化安順場址不管是在污染物形態、污染土壤量與污染物濃度方面均為國內外罕見，受污染土壤之戴奧辛(PCDD/Fs)、五氯酚(PCP)與汞含量均遠遠超過管制標準；而此種包含不同超高濃度毒性物質之複合式污染型態，是最難整治的污染場址。本研究擬以中石化安順場受污染土壤為對象，透過本研究群自主研發的超臨界流體氧化（SCWO）處理模組進行長期試驗，以評估不同操作參數條件下（包含操作溫度、操作壓力、停留時間及氧化劑添加量等），對戴奧辛、五氯酚之去除效率及汞回收效率進行系統性的評估。在後段空氣污染控制技術方面，則搭配本研究群研發的驟冷塔進行氣相汞的回收，再藉由流動床式活性碳吸附/熱解/再生系統（發明第I424877）將汞與戴奧辛等有機污染物同步進行吸附及破壞去除。此外，在廢水處理技術方面，採用鈀觸媒（Pd/Al2O3）加氫脫氯技術達到戴奧辛減量之目的，避免戴奧辛殘留於環境中，達到全面解決（total solution）之境界，本研究所開發之相關技術及執行成果可提供國內相關產業於戴奧辛及汞控制上的新選擇。 ;Recently, various sites of contaminated soil, such as dioxin-containing eggs in Changhua, hazardous wastes in Kaohsiung and soil contaminated by dioxin and mercury in Tainan, are discovered. These issues have attracted much attention from government and general public. In these cases, contaminated soil in An-shun site simultaneously contains extremely high PCP, PCDD/F and mercury concentrations. Different characteristics of these contaminants have caused the difficulty for effective remediation. In this study, super-critical water oxidation (SCWO) technology is self-developed for remediation of contaminated soil containing PCDD/Fs, PCP and mercury. For efficient contaminant removal, relevant operating parameters including temperature, pressure, reaction time and oxidative additives ratio are tested. For effectively controlling pollutant emission, especially mercury, a novel quench tower is designed for recovering gas-phase mercury and condensing organic compounds. furthermore, the residual gaseous pollutants will be further destroyed via multi-layer adsorption/pyrolysis/regeneration system (Patent No I424877). Pollutants in contaminated soil, including PCDD/Fs, POPs and mercury, can be effectively destroyed and recovered via the integrated system of continuous pyrolysis system and multi-layer adsorption/pyrolysis/regeneration setup developed in this study. In addition, the waste water eluted via quench tower may contain high concentration contaminants. The chlorinated contaminants in the wastewater will be removed via hydro-dechlorination for total solution. The fruitful results obtained in this study will support the novel technology for remediation of the contaminated soil. ;研究期間：10501 ~ 10512 |
