以不同方式活化過硫酸鈉處理染整廢水之研究

Treating dye wastewater by persulfate oxidation process with various activation methods

陳蓁怡(Chen-Yi Chen)

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(2010年)

https://doi.org/10.6846/TKU.2010.00023

摘要

染整廢水處理技術研究文獻中，高級氧化處理程序(Advanced Oxidation Processes, AOPs)是較為廣泛採用方法之一，其中又以Fenton處理程序為主要處理技術，但此方法之缺點為藥劑添加量高及污泥產生量大。因此本研究擬採行超音波加熱作為催化方法，並配合添加過硫酸鈉產生硫酸根自由基之方式，希望藉由超音波震動產生熱能，催化過硫酸鹽產生強氧化力之硫酸根自由基(SO4-˙)，達到去除污染物的效果。因此，其性質穩定且對環境無危害，所以後續處理上較處理大量污泥或是其他二次汙染要來的容易之優點，加上超音波屬於物理性之催化角色，來發展更新穎且無害於環境之處理程序。
實驗結果顯示，藉由超音波催化水樣溫度可高達70℃，因而縮短染料色度降解的時間。而實驗條件為超音波催化時，與單純加熱催化相比，在低溫度(30、40℃)條件下，超音波可明顯提升色度去除效率，反之在高溫(60℃)時，超音波則使色度去除率降低。
在零價鐵結合過硫酸鈉的批次實驗中，實驗結果說明色度去除效率的提高會隨著過硫酸鹽濃度的增加(PS/Dye莫爾比的增加)，但會隨著起始pH值的增加而減少；零價鐵結合過氧化氫的實驗中，色度去除效率的降低會隨著過氧化氫濃度的減少，但是會隨著起始pH值的增加而減少，使零價鐵表面氧化，降低色度去除效果；綜合兩者氧化劑結合零價鐵比較發現，最理想的pH值為3。探討零價鐵於管柱實驗中操作的可行性，結果顯示染料的降解受到起始pH值以及水力停留時間的影響並不明顯。

關鍵字

過硫酸鹽 ； 超音波 ； 催化 ； 零價鐵

並列摘要

Advanced oxidation processes (AOPs) were wildly studied for dye wastewater treatment. Among the AOPs,Fenton process was the most discussed treatment technologies. However, Fenton process has following disadvantages including high dosage required and large amount of sludge generated. Therefore, the objective of this study is to study ultrasound-activation of persulfate to produce a very powerful oxidant, sulfate free radical, for dye wastewater treatment. Sodium persulfate is a stable and harmless material for environment. The results showed ultrasound can activate persulfate, and the reaction temperature can reach up to70℃. Comparison of ultrasound- and heat-activation of persulfate for dye removal , ultrasound-activation shows higher removal efficiency of dye than heat-activation when temperature is fixed at 25 and40 ℃. However, ultrasound-activation has lower color removal efficiency than heat-activation when temperature is fixed at 60℃.
Zero-valent iron (ZVI) was also used for persulfate activation under batch and column reactors. The experimental results showed color removal efficiency increased with the increase of persulfate concentration, but decreased with the increase of initial pH value. In the experiment of zero-valent iron combined hydrogen peroxide, color removal efficiency decreased with the decreased of hydrogen peroxide concentration, but decreased with the increase of initial pH value due to passivation of ZVI by iron oxide. For both ZVI/persulfate and ZVI/hydrogen peroxide systems, optimized pH value for dye removal was found to be 3.0. In ZVI column experiments, the results showed the initial pH value and HRT did not significantly impact the degradation of dyes.

並列關鍵字

persulfate ； ultrasound ； activate ； Zero-valent iron

參考文獻

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59. 林佩雲. 水中常見之陰離子對過硫酸鹽熱催化三氯乙烯的影響. 國立成功大學環境工程研究所, 台南, 2005.

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