疏水膜與疏水氫氧化銅塗層網過濾結合氣泡萃取去除銅的研究

Integration of hydrophobic membrane or superhydrophobic copper hydroxide coated mesh filtration with compressed air-assisted solvent extraction for copper removal

謝屹宸(YiChen Xie)

指導教授 ： 李奇旺

淡江大學/工學院/水資源及環境工程學系碩士班/碩士(2021年)

https://doi.org/10.6846/TKU.2021.00002

摘要

本研究探討疏水膜與疏水氫氧化銅塗層網過濾結合氣泡萃取去除含銅廢水。實驗中用到兩種薄膜過濾方式和一套疏水氫氧化銅塗層網系統。對於薄膜系統，首先探討pH以及D2EHPA劑量對去除銅和化學需氧量的影響，隨後探討氣泡萃取系統釋放壓力對去除銅和化學需氧量的影響，最後探討D2EHPA與煤油比例對去除銅和化學需氧量的影響。結果顯示，濃度為每升5毫摩爾的銅溶液在pH值為5以及D2EHPA劑量為1.61克和釋放壓力為0.3 MPa，D2EHPA/煤油的比例為1: 10的條件下，利用薄膜過濾系統後，銅的去除效率能達到98%，但是化學需氧量的去除效率只有60%，且薄膜堵塞的情況嚴重。
對於疏水氫氧化銅塗層網系統，首先探討水力停留時間對去除化學需氧量的影響，隨後探討萃取劑/水的比例對去除化學需氧量的影響，最後討論D2EHPA/煤油比例對去除銅和化學需氧量的影響。結果顯示，濃度為每升5毫摩爾的銅溶液，在pH值為5以及D2EHPA劑量為1.61克和釋放壓力為0.3 MPa，D2EHPA/煤油的比例為1: 10，水力停留時間為1分鐘的條件下，利用疏水氫氧化銅塗層網系統過濾後，銅的去除效率能達到98%。並且COD的去除效率優於薄膜系統，可以保持在80%-85%，且沒有堵塞的情況產生。

關鍵字

薄膜 ； 疏水 ； 過濾 ； 氣泡萃取 ； D2EHPA ； 煤油 ； 水力停留時間

並列摘要

Integration of hydrophobic membrane or superhydrophobic copper hydroxide coated mesh filtration with a compressed air-assisted solvent extraction system was employed for copper removal. Two sets of membrane systems, namely, cross-flow system and dead-end system, and one set of hydrophobic copper hydroxide coated mesh system were used in the experiment. For the membrane system, the effects of pH and D2EHPA dosage on copper removal and COD removal were discussed first. Then the effects of the compression pressure of the compressed air-assisted solvent extraction system on copper removal and COD removal were discussed. The effects of different ratios of D2EHPA and kerosene on copper removal and COD removal were discussed at the end. The copper concentration in the wastewater used in the experiment is 5 mM. The best experimental condition is pH 5, D2EHPA dosage of 1.61 g, compression pressure of 0.3 MPa, and D2EHPA/kerosene ratio of 1:10. With the integration of the membrane system, the removal rate of copper can reach 98%, but the removal rate of COD is only 60%, and membrane fouling is serious.
For the hydrophobic copper hydroxide coated mesh system, the effects of hydraulic retention time on COD removal were discussed first. Then the effects of different extractant/water ratios on COD removal were discussed. The effects of different D2EHPA/kerosene ratios on copper removal and COD removal were discussed at the end.
The results showed that for the copper solution with a concentration of 5 mM under the conditions of pH 5, a D2EHPA dose of 1.61 g, a compression pressure of 0.3 MPa, a D2EHPA/kerosene ratio of 1:10, and a hydraulic retention time of 1 minute, the copper removal efficiency can reach 98% with the integration of the superhydrophobic copper hydroxide coated mesh system. The removal of copper in membrane system and superhydrophobic copper hydroxide coated mesh system are almost the same, but the superhydrophobic copper hydroxide coated mesh system has a better COD removal, The COD removal rate maintained at 80%-85% for a long operation time of 12 hrs, and there is no clogging.

並列關鍵字

Membrane ； Hydrophobic ； Filter ； Compressed air-assisted solventextraction (CASX) ； D2EHPA ； Kerosene ； Hydraulic retention time (HRT)

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