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年度	109	專案性質	實驗性質
專案類別	研究專案	研究主題	整治
申請機構	中臺科技大學	申請系所	環境與安全衛生工程系
專案主持人	張益國	職等/職稱	副教授
專案中文名稱	油污染土壤減容成效提升
中文關鍵字	油污染土壤, 分離, 減容
專案英文名稱	Separation performance improvement and volume reduction of oil contaminated soils
英文關鍵字	Oil contaminated soils, separation, volume reduction
執行金額	1,058,950元
執行期間	2020/1/30 至 2020/12/4
計畫中文摘要	本研究「油污染土壤減容成效提升」進行下列改善試驗: (a)攪拌方式改善，嘗試以空氣攪拌替代或增強槳板攪拌效果。 (b)進流速度操作條件優化，了解送漿能力，對於模廠漩流器進行流況模擬，擷取適合操作參數進行實驗。 (c)如上述結果不佳，建議可考慮設計更換適合的漩流器、增加泥水泵馬力進行。 (d)架設分流槽，可進行並聯/串聯水力分選。 期藉由現有設備及條件診斷，改善模廠土壤清洗技術處理、分離設備及操作條件，促進粗細顆粒分離，達成水力漩流器overflow中63μm以上顆粒含量在10%以下目標，增加粗顆粒回收量，降低後續處理成本。 實驗成果顯示，空氣攪拌具良好效果。在土壤固體密度2.60，土壤:水=1:4(w/w)摻配，於空氣流量350 L/min下，可獲泥水流速0.49 m/s；其傳送質量能力1.33 Kg/s，換算每升空氣可傳送0.228公斤泥水，且僅需0.073馬力。 模廠實驗中，礙於無法獲得15馬力以上泥水泵，漿體流速不足導致分離效果不佳。於是設計新漩流器(縮小直徑)，於實驗室測試其效能，使用5馬力泥水泵送漿。新漩流器在13m/s流速下可得最佳操作效果，overflow stream中(主要以細顆粒為主)，94.3%顆粒粒徑均在63μm以下，僅有5.7%顆粒粒徑在63μm以上，d50為13.79μm；underflow stream中，89.3%顆粒在63μm以上，d50為174.3μm，顯示分離效果佳。進一步檢驗TPH含量，overflow土壤TPH濃度高達205,607 mg/kg；underflow土壤則僅是515 mg/kg，粗細顆粒分離佳，underflow土壤滿足TPH<1,000 mg/kg要求，土壤應能直接回填再利用，毋須再經其他物理、化學、熱處理。
計畫英文摘要	In this work, we applied separation performance improvement and volume reduction for oil contaminated soils. Firstly, the auditing was made for present pilot treatment processes. From the results of present hydrocyclone performance, it was found that there was about 24.3% coarse particle (particle size larger than 63μm) existed in overflow stream. It could be improved (reduced the coarse particle content in overflow stream) by modifying operating conditions or designed new hydrocyclone equipment with suitable operating factors. Hence, (a) mixing improvement; (b) inlet velocity increase improvement; (c) designing new suitable hydrocyclone with related operations; (d) designing mass flow controlled tank were conducted in this study. The performance improvement target was aimed at that less than 10% coarse particles existed in overflow stream. Results from mixing improvement experiments showed that the slurry was well-mixed applying air-mixing devices under 350 liter-air/min input and 0.49 m/s slurry flow rate conditions. The performance of pilot-scale hydrocyclone system was not good owing to lack of 15 Hp pump to produce high slurry inlet velocity which we need. A new hydrocyclone was designed and was tested for high separation performance. Under slurry inlet velocity of 13 m/s, the separated soil from overflow stream showed a TPH concentration of 205,607 mg/kg and 94.3% particles in overflow stream were smaller than 63μm (<63μm classified as fine soil). On the other hand, the separated soil from underflow stream showed a TPH concentration of 515 mg/kg, and 89.3% particles in underflow stream were larger than 63μm. It could achieve volume reduction goal of oil contaminated soils and could be an cost-effective improvement.