| 研究生: |
張鈞維 Chang, Chun-wei |
|---|---|
| 論文名稱: |
以淨水污泥及鐵氧化物吸附劑去除水庫水體含磷之研究 Sludge cake and iron oxide were used as adsorbent to remove phosphate |
| 指導教授: |
溫清光
Wen, Ching-Gung |
| 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: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 84 |
| 中文關鍵詞: | 吸附 、淨水污泥 、磷酸鹽 |
| 外文關鍵詞: | Sludge cake, Phosphate, Adsorption |
| 相關次數: | 點閱:111 下載:3 |
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台灣水庫由於含氮量普遍偏高,因此磷便為優氧化主要的控制因子,本研究中探討以淨水污泥和鐵氧化物中之針鐵礦為吸附劑去除水庫中磷酸鹽之研究,實驗內容包括吸附劑之製備和調理、吸附劑表面特性分析、吸附動力、恆溫吸附和競爭吸附等,其中吸附實驗所用之溶液以去離子水所配製。此外,本研究還採用鳳山淨水場的原水進行吸附實驗,並和配製磷酸鹽溶液的吸附情形比較。
以去離子水配置磷酸鹽的初始濃度為1 mg P/L,在pH=7條件下,原淨水污泥飽和吸附量為0.042 mg P/g,對磷酸鹽吸附效果低,鹼洗後將淨水污泥SiO2的成分降低,吸附容量提高為1.2 mg P/g,在52小時以上達成平衡;而針鐵礦在24小時以上達成平衡,吸附容量為32 mg P/g。
在恆溫吸附實驗中,兩種吸附劑對磷酸鹽的吸附量隨著平衡濃度增加而增加,也隨著pH增加而減少,而在pH=4時最大(本研究最低值)。在原水吸附實驗中,兩種吸附劑的飽和吸附量為配置磷酸鹽溶液的一半,原因主要是受到高HCO3-濃度的影響。
Phosphate is an essential factor for eutrophication of reservoirs in Taiwan due to the high N concentration in water. In this study, sludge cake and iron oxide (goethite) were used as adsorbent to remove phosphate. The preparation and the characterization of adsorbent, the kinetics and isotherm of adsorption, and the competitive adsorption experiment were carried out. In order to compare the difference between prepared phosphate solution and real water sample, the water sample from Fengshan water treatment plant was conducted for the further adsorption experiment.
According to the average concentration in reservoirs, the solution was prepared with the phosphate concentration of 1 mg P/l in deionized water. At pH7, the adsorption capacity of raw sludge cake was as low as 0.042 mg P/g. After the modification of sludge with NaOH, the adsorption capacity raised to 1.2 mg P/g within 52 hours. The adsorption capacity of goethite at pH7 was found to be 32 mg P/g within 24 hours.
The results of the adsorption isotherm experiments showed that the adsorption capacities of the both adsorbent increase with the decreasing pH-value. By comparing the adsorption behaviors of the both adsorbent in prepared solution and real water sample from Fengshan water treatment plant, the high concentration of HCO3- was found to be the limiting factor so that the adsorption capacities were reduced by 50% in the real water sample.
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