樹脂薄片電去離子技術應用於半導體合成廢水中鎳離子去除之表現評估

Abstract

樹脂薄片電去離子是一種不僅用於淡鹽水淡化，不使用有害化學物質之外，亦可能淨化及濃縮含金屬離子廢水利於後續回收利用的技術。本研究藉由不同施加電壓和進料流速條件，來評估樹脂薄片電去離子技術對於含鎳離子合成廢水淨化的能量效率，去除率，生產率與回收率。結果表明，在鎳離子濃度為2g/L，可達94%以上的去除率，更在操作條件下為90mL/min進流流量及9V操作電壓下，處理後濃度為0.4 mg/l低於法規放流水標準，而在3g/L，可達70%以上的去除率及6(g/m2/hour)以上的生產率，且在電去離子技術的反應動力學的研究，得知其去除率部分符合一階反應動力學模式，最後使用Umberto 5.5.之生命週期軟體，進行初步評估結果得知樹脂薄片電去離子技術具有較低的環境衝擊結果，且本研究以Design Expert軟體評估其較高去除率及較低能耗之最佳化操作條件。此外，本技術不僅有可以原位電再生離子交換樹脂能力，減少污泥的生成，有害化學物質使用，亦有淨化及濃縮的功能利於回收使用，在其他淨水技術中具有一定的優勢。

Resin wafer electrodeionization is different from the other water purification technologies in that its brackish water desalination requires no harmful chemicals use. In addition, it is capable of purifying and producing metal ion containing wastewater. Despite these merits, two drawbacks of the general electrodeionization technology affect its wide application in the field: the high energy consumption and heterogeneization. In this study, the performance efficacy of resin wafer electrodeionization used nickel ion-containing synthetic wastewater under different applied voltages and feed flow rates, and evaluated the energy efficiency, removal ratio, productivity, and recovery ratio. The results showed the nickel ion concentration is 2g/L, the removal ratio can reach 94% or more, and under the operating conditions, the inflow flow rate of 90mL/min and the application voltage of 9V, the concentration after treatment is 0.4 mg/l lower than the regulatory standard. The nickel ion concentration is 3 g/L, and the removal ratio of 70% or more and the productivity of 6 (g/m2/hour) or more are obtained, and the results are found that optimization operating conditions of the high removal ratio and low energy consumption by Design Expert software. In the study of the reaction kinetics of the electrodeionization technology, it was found that the removal rate partially conformed to the first-order reaction kinetics model. Finally, Umberto 5.5. life cycle software was used for preliminary evaluation. The resin wafer electrodeionization technology has lower environmental impact results. Therefore, the advantages of this technology are demonstrated in this present study: (1) this technology with ion exchange resins can be being electrically re-generable in situ; (2) reducing sludge formation; (3) its waiving the use of harmful chemicals; (4) allowing purification and concentration, which is beneficial to recycling. In conclusion, all these merits confirm the strengths of this technology in meeting the needs of contemporary life and its promising role in the field.