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  • 學位論文

應用零價鐵結合氧化劑(ZVI/H2O2、O2、Air)以提升化學混凝處理非離子型界面活性劑成效之研究

Enhancement of Coagulation of Nonylphenol ethoxylate by Zero-Valent Iron with Oxidants (ZVI/H2O2, O2, Air)

指導教授 : 陳孝行
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摘要


一般金屬表面處理業中使用化學混凝處理廢水,但是廢水中壬基苯酚聚乙氧基醇,由於本身的親水性質使得該物質廢水中的去除率相當有限,因此若要增加化學混凝效率必須增加 NP9EO 的疏水性質。 因壬基苯酚聚乙氧基醇其親水性,因此希望於化學混凝程序前將壬基苯酚聚乙氧基醇作個前處理,提高壬基苯酚聚乙氧基醇的疏水性質,因此本研究利用零價鐵(1、2、3、5g / L)結合過氧化氫(0、35、70、125、250 mg / L)以及零價鐵結合曝氣(Air、O2)產生強氧化劑氫氧自由基來破壞壬基苯酚聚乙氧基醇結構,利用氫氧自由基攻擊乙氧基醇鏈(親水基),以冀達到提升壬基苯酚聚乙氧基醇疏水特性的目的,後續並接以化學混混凝程序,利用前處理所殘留鐵離子作為混凝劑而不另外添加混凝劑。 於 ZVI / H2O2 前處理當中,於實驗條件 pH 1.5、2、3、4,零價鐵 3 g / L,過氧化氫 70 mg / L,以 pH 2 於最終反應時間 60 分鐘可以達到較佳的效果,其NP9EO 以及 TOC 去除率分別為 80.5% 與 65.2 %。在利用不同零價鐵劑量結合不同濃度過氧化氫下,其實驗結果經由軟體模擬於條件 ZVI 3 g / L - H2O2 125 mg / L 時可得到最佳化參數。於零價鐵結合曝氣部分,利用曝氣方式替代過氧化氫,曝空氣對於 NP9EO去除率 42.6 %、TOC 去除率為 28 %,而曝氧氣對於 NP9EO 去除率 47.6 %、TOC 去除率 34.7%。此外經由 XAD-8 樹脂分析結果,證實經前處理確實可將破壞 NP9EO 結構增加疏水性質。 於化學混凝部份,NP9EO 經前處理後接以化學混凝程序,利用前處理殘留鐵離子作為混凝劑,化學混凝後總NP9EO去除效果經 Surfer 軟體模擬,於前處理於 ZVI 2.5 g / L – H2O2 125 mg / L 條件下就可達到最佳化。利用 ZVI / Air、O2 作為前處理於化學混凝程序下,利用前處理殘餘鐵離子作為混凝劑,曝空氣 NP9EO 總去除率約47.7 %、TOC去除率約 28%,曝氧氣部分 NP9EO 及 TOC 去除效果分別為 55% 與 43 %。

並列摘要


Metal surface treatment industry employs coagulation to treat wastewater, but in wastewater NP9EO of hydrophilic property made that removal efficiency limited. In order to increase the efficiency of chemical coagulation, it is necessary to increase the NP9EO hydrophobic property. This study used ZVI / H2O2, Air and O2 as a pretreatment before chemical coagulation, and used hydroxyl radical to destroy NP9EO hydrophilic group structures. This study included two stages of experiment. First of all, the ZVI / H2O2, Air or O2 process was used to pretreat NP9EO. Second, the pretreatment sample combined with coagulation by using pretreatment residual iron ionic. In the ZVI / H2O2 pretreatment with different pH, NP9EO could get better removal efficiency when pH was 2(NP9EO 1000 mg / L, ZVI 5 g / L, H2O2 125 mg / L), NP9EO and TOC removal efficiency were 58.4 % and 25.2 % , respectively. Besides, the ZVI / H2O2 pretreatment result could be using surfer software to get the optimum ZVI / H2O2 dosage which was ZVI 3 g / L – H2O2 125 mg / L. 42.6 % NP9EO and 28 % TOC were removed by using ZVI /Air, nevertheless 47.6 % NP9EO and 34.7 % TOC were removed by ZVI / O2. In addition, through the XAD-8 resin analysis confirmed that pretreatment could increase the hydrophobic nature of NP9EO by destroying NP9EO structural. NP9EO used the Fe2+ that pretreatment residual to apply the process of chemical coagulation after the pretreatment, and the pretreatment optimization was found under ZVI 2.5 g / L – H2O2 125 mg / L ,after total removal efficiency was simulated by the surfer software. Using pretreatment of ZVI / Air, O2 in the process of chemical coagulation, the total NP9EO and TOC removal efficiency were about 47.7% and 28% under aeration of oxygen.

並列關鍵字

NPnEO Zero valent iron hydrophilic hydrophobic coagulation

參考文獻


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被引用紀錄


林家緯(2013)。利用甘胺酸硝酸鹽程序進行鐵錳摻雜氧化銅處理有機污染物之研究〔碩士論文,國立臺北科技大學〕。華藝線上圖書館。https://doi.org/10.6841/NTUT.2013.00383

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