| 研究生: |
彭惠君 Peng, Hui-Chun |
|---|---|
| 論文名稱: |
高錳酸鉀對水中有機物去除機制之研究 The Study on the Mechanisms of Aqueous Organic Removal by Potassium Permanganate |
| 指導教授: |
葉宣顯
Yeh, Hsuan-Hsien |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 環境工程學系 Department of Environmental Engineering |
| 論文出版年: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 116 |
| 中文關鍵詞: | 前氧化劑 、有機物 、高錳酸鉀 |
| 外文關鍵詞: | Preoxidants, Organics, Potassium Permanganate |
| 相關次數: | 點閱:107 下載:13 |
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由於鳳山水庫原水中含有較高的有機物濃度,於前加氯時,易生成較高濃度之消毒副產物,此外氯之氧化作用,會將大分子疏水性有機物氧化成小分子親水性有機物,而影響後續混凝處理效率。為了減少消毒副產物的生成與後續處理單元的負荷,必須使用另一氧化劑來替代前加氯程序,在此選用高錳酸鉀作為前氧化劑。
本研究主要針對水中有機物為探討對象,實驗之初,選用鳳山原水,調整其pH及硬度,進行高錳酸鉀氧化試驗,藉以瞭解pH及硬度對高錳酸鉀去除原水中有機物之影響。接著配製人工原水,使背景單純化,選用一簡單有機物水楊酸( salicylic acid )及一複雜有機物腐植酸( humic acid ),來模擬水中天然有機物,以瞭解高錳酸鉀對水中有機物之去除效果以及其反應機制。
研究結果顯示,高錳酸鉀對鳳山原水內所含有機物之去除量,隨著pH升高而增加,且隨著硬度之增加,有助於高錳酸鉀去除原水中之有機物,此結果應與膠體表面之界達電位趨向於零,及其穩定性降低相關。對於高錳酸鉀氧化有機物所生成之MnO2型態,其結構經由X-ray 繞射圖譜,發現是屬於d-MnO2。
在高錳酸鉀去除水楊酸及腐植酸之機制研究方面,以高錳酸鉀直接進行氧化試驗,且以d-MnO2進行吸附試驗,結果顯示,隨著高錳酸鉀劑量之增加,水中殘餘水楊酸及腐植酸之濃度亦隨著減少;而d-MnO2對腐植酸較之水楊酸有較大吸附量,尤其在酸性環境之下更有助於吸附作用之發生。由此可知高錳酸鉀對水楊酸以氧化作用為主;對腐植酸而言,則是兼具氧化及吸附作用。
關於d-MnO2對有機物之去除,在前加鈣試驗中,鈣離子無助於水楊酸吸附於d-MnO2表面,但有助於d-MnO2吸附腐植酸,而後加鈣時,則無此現象發生。若以高錳酸鉀氧化腐植酸,鈣離子則有助於高錳酸鉀所生成之d-MnO2吸附其氧化後之有機物質,且易與腐植酸結合形成錯合物。此外加鈣之順序會影響鈣離子與腐植酸錯合之程度。
The application of prechlorination on source water with high organic, might result in several drawbacks, including high total trihalomethane (TTHM) formation, decrease of organic removal by coagulation, and increase of biodegradable organic matter. Potassium permanganate have been demonstrated the ability to reduce the content of organic matter, including precursor of TTHM. In this study, it was used as an alternate oxidant to substitute chlorine. And the mechanisms of organic removal by potassium permanganate (KMnO4) were discussed.
Earlier in this research, the raw water from Fan-San (FS) Water Works was collected and adjusted to various pH and hardness values for understanding the effects of these parameters on organic removal by KMnO4. Then, for elucidating the mechanisms of organic matter removal by KMnO4, salicylic acid (SA) and humic acid (HA) were selected to simulate as low and high molecular weight organics in source water, respectively.
Concerning organic removal in FS water by KMnO4, both high hardness and high pH value was superior to those with either low hardness or low pH value. This may be the decrease of colloidal stability. The type of manganese dioxide, resulted from the reduction of KMnO4 by organic matters, was proved by X-ray diffraction to be the type of d-MnO2.
Furthermore, the residual concentrations of both SA and HA were decreased with increasing KMnO4. However, the amount of HA adsorption on d-MnO2 was larger than that of SA. From these results, it was speculated that the mechanism for SA removal by KMnO4 was dominant by oxidation, while that for HA removal was probably by both adsorption and oxidation.
For the effect of calcium on the adsorption of organic matter on d-MnO2, calcium added prior to d-MnO2 addition could increase the amount of HA adsorption, but not affect that of SA adsorption. As for the calcium added following d-MnO2, similar results would not be observed. Based on the experimental results, it also found that calcium could increase the adsorption of HA on d-MnO2, formed from the reaction between HA and KMnO4.
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