垃圾焚化底渣資源化前處理之研究 －連續式加藥水洗脫氯

A Study of MSWI Bottom Ash by Dechlorination Pretretment of Continuous Dosing Wash

蔡煒嶸(wei-rung Tasi)

指導教授 ： 章裕民

國立臺北科技大學/工程學院/環境工程與管理研究所/碩士(2009年)

https://doi.org/10.6841/NTUT.2009.00093

摘要

底渣再利用目前比較多的用途為用於水泥原料、路基材料等，然而多數研究已發現單用「清水」淋洗或攪拌洗滌底渣以去除水溶性氯離子所需耗用的「水量」太大，這主要原因可能是一方面由於溶解性(易溶解與難溶解)的氯鹽之溶解度逐漸飽和，另一方面可能是底渣顆粒中的「水溶性氯離子」溶出之「質量傳輸(mass transfer)」受到外圍水中的氯離子濃度逐漸增多，而降低其被移除的速率與量。故本計畫係利用化學反應與物理溶出機制，期使底渣的水溶性氯離子含量低於0.024% (依CNS1240規定)以符合我國法規規定之第一類型之再利用等級。
經由實驗結果發現，對於水溶性氯離子濃度之去除效率，滯留時間、液固比與藥劑之添加量(濃度)等三項因子為重要影響因子之一，在每槽滯留時間30分鐘、液固比=3，添加酸性濃度相當於pH=2.3之酸液時，於四次批次試驗或連續式加藥水洗試驗下，可使底渣之水溶性氯離子含量由0.902%降至0.017%。若以四段連續式水洗處理之底渣，於處理條件：液固比=1、每槽滯留時間10分鐘、添加酸性濃度相當於pH=3.1之酸液，去除率僅約為87.2%，但若提高各參數值(即液固比=3、每槽滯留時間30分鐘、酸性濃度增加至相當於pH=2.3之酸液)，則其去除率可高達98.1%。由結果可發現添加弱酸性藥劑可提高底渣水溶性氯離子的去除效果。

關鍵字

焚化底渣 ； 資源化 ； 連續式 ； 加藥水洗 ； 脫氯

並列摘要

Reuse of bottom ash to take advantage of a relatively large number of uses for raw materials for cement, subgrade materials. However, most studies have found that single-use "water" at the end of leaching or mixing slag washing to remove water-soluble chloride ions required for the consumption of "water", which on the one hand, the main reason may be due to soluble (dissolves easily and difficult to dissolved) chloride on the solubility of the gradual saturation, on the other hand, particles may be the residue at the end of the "water-soluble chloride ion," Dissolution of the "mass transfer (mass transfer)" affected by external chloride concentration in water gradually increased, while reducing their Remove the rate and quantity. Therefore, the department plans to use chemical reactions and physical dissolution mechanism at the end of Java to make the water-soluble chloride ion content of less than 0.024% (in accordance with the provisions of CNS1240) to comply with China's laws and regulations of the first type of re-use levels.
By the experimental results showed that water-soluble chloride ion concentration for the removal efficiency, residence time, liquid-solid ratio and add the amount of pharmaceutical (concentrations) of three factors such as an important factor for one in every 30 minutes retention time slot, liquid-solid ratio = 3, add the acid concentration is equivalent to the acid pH = 2.3, in four batches of test or continuous test Dosing washed, the residue at the end will enable the water-soluble chloride ion content of 0.902% from 0.017 %. In terms of four continuous residue washed at the end of processing, handling was the worst conditions (liquid-solid ratio = 1, every 10 minutes retention time slot, add the acid concentration is equivalent to the acid pH = 3.1), the removal rate of only about 87.2%, but increase the value of each parameter (ie, liquid-solid ratio = 3, each slot of 30 minutes retention time, acid concentration increased to equivalent to the acid pH = 2.3), while its removal can be as high as 98.1%. Integrated these preliminary results can be found in weak acid added at the end of the pharmaceutical residue can increase the removal of water-soluble chloride ion effect.

並列關鍵字

Bottom Ash ； Resources ； Continuous ； Dosing Wash ； Dechlorination

參考文獻

10. 吳忠勳，以微波消化處理焚化飛灰鉛重金屬之研究，碩士論文，國立台北科技大學環境工程與管理研究所，台北，2005。

12. 李銘清，利用微波消化法處理有害性物質之研究–戴奧辛與鉛重金屬，碩士論文，國立台北科技大學環境工程與管理研究所，台北，2007。

13. 張哲銘，垃圾焚化底渣資源化前處理之研究–流體化床熱脫臭，碩士論文，國立台北科技大學環境工程與管理研究所，台北，2007。

7. 李公哲、侯嘉洪、黃錦明、張蕙蘭，廢棄物焚化灰渣材料化技術研究專案計畫期末報告，國立台灣大學環境工程研究所，行政院環境保護署委託，2003。

11. 行政院環境保護署，96年度垃圾焚化場焚化灰渣管理及查核專案工作計畫，中興工程顧問股份有限公司，2007。