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標題: | 酸淋洗及二段式奈米薄膜於污泥灰渣之磷回收 Phosphorus Recovery from Sewage Sludge Ash by Acidic Leaching and Two-stage Nanofiltration Processes |
作者: | Yu-Chu Chen 陳又楚 |
指導教授: | 駱尚廉(Shang-Lien Lo) |
關鍵字: | 奈米薄膜,磷回收,下水污泥灰,銅,鉛, Nanofiltration,Phosphorus recovery,Sewage sludge ash,Copper,Lead, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 焚化下水污泥灰中富含磷,使用酸淋洗法可將磷溶出,但同時也會溶出重金屬。因此本研究目的為發展兩段式奈米薄膜法來分離重金屬,並求出最佳操作參數。
第一段過濾控制pH低於5.0值,目的為利用奈米薄膜的選擇性使重金屬截留,並使磷酸通過;第二段過濾控制pH高於4.0值下將磷酸截留並濃縮。實驗控制因子除了pH值,尚有過濾之操作壓力。 實驗結果顯示,第一段過濾於pH值2.0下操作,可得鉛離子截留率約95.9%;銅離子截留率約88.0%,及磷酸離子截留率約12.6%,故第一段過濾設定最佳pH值為2.0。而操作壓為10 bar ,於滲透液回收率90%時,可得到磷酸質量回收率84.6%,以及銅離子質量截留率79.2%,和鉛離子的98.8%。 第二段過濾於pH值6.0下操作,可得磷酸離子截留率約98.5%,故設定最佳pH值為6.0。第二段最佳操作參數為操作壓10 bar下,於滲透液回收率87%時可得到磷酸質量截留率90.1%,濃縮倍數為7.4。 Incinerated sewage sludge ash contains rich phosphorus. Recovery of phosphorus from sewage sludge can also be carried out through an acidic leaching procedure. However, heavy metals also be carried out, therefore the objectives of this study are developing two-stage nanofiltration processes to separate heavy metals and to find the optimal factors. In the first stage, the pH is lower than 5.0. The objective is to utilize the selectivity of nanofiltration membrane (NF270) to remove heavy metals and to make phosphate pass through the membrane. In the second stage, the pH is higher than 4.0. The objective is to reject and to concentrate phosphate. The influencing factors contain pressure and pH. The results of the first stage that pH was 2.0, was obtained the Pb2+ retention was 95.9 %, the Cu2+ retention was 88.0%, and the phosphate retention was 12.6%. Consequently, the pH value in the first stage could be determined as 2.0. The optimal results showed that at a pressure of 10 bar and permeate recovery 90% could recover 84.6% mass of phosphate, removed 79.2% mass of Cu2+ and 98.8% mass of Pb2+. The results of the second stage that pH was 6.0, was obtained the phosphate retention was 98.5%, therefore the pH value in the second stage could be determined as 6.0. The optimal result showed that at a pressure of 10 bar and permeate recovery 87% can recover 90.1% mass of phosphate, and the concentrate ratio was 7.4. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/63078 |
全文授權: | 有償授權 |
顯示於系所單位: | 環境工程學研究所 |
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