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年度	110	專案性質	非實驗性質
專案類別	模場試驗	研究主題	整治
申請機構	國立交通大學	申請系所	環境科技及智慧系統研究中心
專案主持人	周珊珊	職等/職稱	執行長
專案中文名稱	應用可再生型吸附顆粒(RAP)搭配多介質水力沖洗循環系統(HFS)去除受LNAPL污染之土壤及地下水
中文關鍵字	可再生型吸附顆粒,多介質水力沖洗循環系統,土壤,地下水
專案英文名稱	Combination of regenerative adsorption particles (RAP) and hydraulic circulation flushing soil remediation system (HFS) for the remediation of contaminated soil and groundwater
英文關鍵字	RAP,HFS,LNAPL
執行金額	3,319,888元
執行期間	2021/1/1 至 2022/2/28
計畫中文摘要	輸油管線和加油站與油槽的洩漏是常見的油品污染土壤與地下水污染源。本計畫係採用兩種不同領域的高端處理技術，來處理輕質非水相溶液非水相液體(light non-aqueous phase liquid, LNAPL)污染物，兩種技術分別為可再生型吸附顆粒(Regenerative Adsorption Particles，簡稱RAP)與多介質水力沖洗循環系統(Hydraulic circulation Flushing Soil remediation System，簡稱HFS)。其中RAP係以活性碳為基底，覆蓋貴金屬成分，具有極佳的吸附與氧化還原特性，且可再生循環使用，可處理水中有機物和VOC；HFS系統設計構想係依據油類污染物特性，於現地藉由系統循環抽除、淋洗並結合霧化及曝氣原理，以同時去除土壤及地下水中氣相、浮油相及溶解相之污染物。結合RAP及HFS技術於現地設置處理時，應可對於現地高濃度之LNAPL污染物將有明顯之移除效果，而使整治效率有效提升。 本計畫模場設置區為台灣中油股份有限公司石化事業部林園石化廠「100油槽區」儲槽LY-109南側，本場址之土壤污染物與地下水污染物均為苯、甲苯及總石油碳氫化合物(TPH)。計畫初期在模場區先進行土壤及地下水調查以確認背景濃度，土壤背景調查引用「中油林園廠」107年之檢測結果-3採樣點TPH皆超過土壤污染管制標準(1,000 mg/kg)；地下水背景調查則於今年4月底進行採樣，檢測結果3口井除TPH項目超過第二類地下水污染管制標準(10 mg/L)外，其餘項目皆低於定量下限值。 模場HFS整治井及相關系統在配合安裝防爆型電控設備後，已於110年08月12日正式試運轉，本計畫之模場試驗分為兩階段，第一年將 RAP放置於 HFS系統之地表上，RAP於地表上主要用於吸附 HFS系統運轉期間產生之揮發性氣體，另放置於循環水處理槽系統之 RAP，主要是移除地下水中之污染物；而第二年則將RAP設置於HFS系統之影響半徑範圍內之地下水監測井中，藉由HFS系統運轉帶動下，運用 RAP本身特有處理功能，有效將影響半徑範圍內之地層污染物移除。本場址之 HFS系統在運轉期間皆定期紀錄 HFS系統實際操作情形，且在試運轉後進行系統影響半徑測試，結果亦可見明顯地下水位洩降曲線。 此外，為評估模場試驗成效，亦規劃於模場試驗期間定期進行 HFS尾氣、地下水及土壤監測作業，本計畫至今已完成5次 HFS尾氣、8次地下水及2次土壤監測作業。到目前為止，模場試驗已經操作約5個月，雖然目前土壤及地下水定期監測結果仍為總石油碳氫化合物超過污染管制標準，但尾氣處理結果良好。尾氣處理原先設計是使 RAP先吸附飽和後再將其再生，但目前為止仍未發現吸附飽和現象，這可能與我們在實驗室測試甲苯有類似的現象-即在常溫下經由 RAP和空氣氧化，即可對 VOCs也產生相當的降解效果有關。另外由土壤監測結果，顯示循環系統已將地層中之污染聚集至 HFS系統周圍，因此，預計結合 RAP及 HFS技術可加速本場址污染物之移除。後續將持續操作及監測，以評估整體整治成效。
計畫英文摘要	Petroleum hydrocarbons leaks from oil pipes, storage tanks of gas station and oil farm can contaminate soil and groundwater. The main R&D concept of this project integrates two key technologies- regenerative adsorption particles (RAP) and hydraulic circulation flushing soil remediation system (HFS) for on-site light non-aqueous phase liquid (LNAPL) remediation. RAP is the activated carbon-based material, and doping with noble metal oxide thin-film. RAP has excellent adsorption-regeneration and redox, so it can be applied in treating VOCs and the organic pollutants in wastewater and groundwater. According to the characterization of LNAPL pollutants, HFS combining pumping and recirculating, flushing, and air injection with mist atomization will be conducted. Therefore, HFS can remove the pollutants in gas phase, oil phase, and aqueous phase remained in soil and groundwater. Combining HFS and RAP, it should have the significant removal performance and improve the remediation efficiency. A pilot test study will be conducted in Lin Yuan petrochemical plant of CPC Corporation. The major pollutants BTEX (benzene, toluene, ethyl benzene and xylene) dissolved into soil and groundwater and migrated from a LNAPL source in a sandy aquifer under this site. In this study, the site background information about soil and groundwater contamination was investigated first. The background soil pollution applies the data sampled from CPC in 2018, which TPH (total petroleum hydrocarbons) concentration of 3 sampling points are all above the soil pollution control standard (1,000 mg/kg). The background groundwater pollution applies the data sampled in 2021, April, which TPH concentration of 3 sampling wells are all above the groundwater pollution control standard (10 mg/L) while other items meet the standards. After upgrading the explosion-proof electrical control panel, the HFS pilot system has been normally operated on site since Aug 12, 2021. The on-site pilot test was separated into two stages. For the first stage in 2021, using HFS to have the good hydraulic circulation and flushing, and RAP bed was installed not only on the ground to treat the VOC of vent, but also in the recirculated water treatment system of HFS to treat groundwater. For the second stage in 2022, RAP bed will be installed inside the monitoring well located in the influence radius of HFS. Therefore, the pollutants remained in the soil, groundwater and vent can be removed. The real operating conditions of HFS system such as the flowrate and accumulated pumping flow were recorded during the operation of pilot system. Furthermore, the influence radius of HFS was also tested, it is shown that the significant drawdown curve of groundwater level occurs when the pumping flow of HFS system is shut down and then restarted. Furthermore, to evaluate the remediation performance of this pilot HFS and RAP system, the sampling and analysis of vent, groundwater and soil were conducted after this pilot system is commissioned. Up to now, monitoring about 5 times of HFS vent, 8 times of groundwater and 2 times of soil were performed. Although the TPH in both soil and groundwater are still above the pollution control standard after 5 months of operation through this pilot system, the outlet vent after RAP bed shows good performance. This may be similar as our experimental results of toluene degradation in the lab, that is, it shows the fairly desirable VOC removal only by RAP and air oxidation at room temperature. On the other hand, examining the monitoring results of soil, it is shown that the recirculating flow has moved the pollution in the soil to the nearby area of HFS system. Therefore, it is expected that integrating both HFS and RAP technologies on-site could reduce the remediation period. The further continuous operation and monitoring of this pilot system will be performed to evaluate the overall remediation effectiveness.