English  |  正體中文  |  简体中文  |  Items with full text/Total items : 52333/87441 (60%)
Visitors : 9110642      Online Users : 162
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/102720

    Title: 垃圾焚化底渣碳酸化浸漬穩定之研究
    Other Titles: A study on the stabilization of MSWI bottom ash by soaking carbonation
    Authors: 黃政隆;Huang, Cheng-Lung
    Contributors: 淡江大學水資源及環境工程學系碩士班
    Keywords: 垃圾焚化底渣;碳酸化;浸漬;無機成分可溶出量測定;bottom ash;carbonation;soaking;TCLP;inorganic components for leaching
    Date: 2014
    Issue Date: 2015-05-04 10:02:40 (UTC+8)
    Abstract: 都市垃圾焚化底渣於再利用之前仍須妥善前處理,以降低重金屬釋出污染環境之風險。碳酸化穩定為一熟知之技術,但仍有需時較久之問題。本研究回收水洗底渣之廢水,以10%之二氧化碳曝氣,使形成含有碳酸之水溶液,利用浸漬方式使CO32-與底渣中的Ca2+形成CaCO3化合物,以期提升底渣中重金屬穩定的效率。
    循環式碳酸化實驗結果顯示,浸漬0.5小時就有抑制重金屬Pb、Zn、Cu、Cd溶出的效果,其溶出濃度分別為0.02、8.23、1.49、0.09 mg/L,Cr的溶出已無法測得;浸漬反應時間愈長,水溶性氯離子洗出量愈多0.5、1、3小時浸漬洗出量分別為74.3、76.2、85.7%。建議將浸漬時間控制在0.5小時並配合105℃烘乾,可達到穩定重金屬及增加氯溶出之效果。
    Municipal solid waste incinerator (MSWI) bottom ash should be pretreated before reusing, which can reduce the risk of polluting the environment by leaching the heavy metals from bottom ash. It is significant scientific and engineering benefit of carbonization for stabilization of solid waste. Nevertheless, taking too much time is the defect of the carbonization. In this study, the retrieved water of washing bottom ash aerated carbon dioxide about 10% to become carbonated water. Let calcium from bottom ash and carbonate ion from carbonated water reacted to form calcium carbonate by dipping process to raise the stability rate of heavy metals.
    The experiment of this study has divided into two parts of batch and circulation. In the batch experiment, the bottom ash through two steps of five minutes stirred and then dipped in carbonated water for 3, 6 and 18h. The aim of this experiment is to observe the concentrations of TCLP for heavy metals and the remove rate of chlorine ion. In the circulation experiment, the dripped solution would be recycled to substitute the tap-water of the first step wash water. The bottom ash through two steps of five minutes stirred and then dipped in carbonated water for 0.5, 1 and 3h. In a circle, the process needs to repeat three times.
    The result of the batch experiment shows that the dripping process really can reduce the TCLP concentration of heavy metals. The concentrations of lead and cadmium do not decrease with the dripping time. Zinc and copper would increase the leaching rate with the dripping time increased. The leaching rates of the water-soluble chloride ion were 44.2%, 45.2% and 46.3% at dipping time of 3, 6 and 18 h respectively. The consummation of alkalinity in the water increases with the dripping time.
    The results of the circulation experiment indicate that the leaching concentration of Pb, Zn, Cu and Cd were 0.02, 8.23, 1.49 and 0.09 mg/L and would be restrained after dripping time of o.5h. Specially, the Cr concentration was not detectable. The leaching amount of the water-soluble chloride increased with the dripping time increased. The leaching rates were 74.3%, 76.2% and 85.7% after dripping time of o.5, 1 and 3h respectively. The dripping time of 0.5h and dry in 105 oC of oven could reach the aim of stabilization of heavy metals and increase the leaching rate of chloride.
    Appears in Collections:[水資源及環境工程學系暨研究所] 學位論文

    Files in This Item:

    File SizeFormat

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback