焚化底渣加藥水洗脫氯成效之研究

A Study on Dechlorinate of MSWI Bottom Ash by Reagent-Assisted Washing

詹家凱(Jia-Kai Chan)

指導教授 ： 章裕民

國立臺北科技大學/工程學院/環境規劃與管理研究所/碩士(2014年)

https://doi.org/10.6841/NTUT.2014.00895

摘要

國內焚化底渣再利用由民國92年推動至今，近年來國內對於底渣資源化再利用之規定亦趨嚴格，底渣再利用依據品質標準之不同可分為三類型，然而國內大部分之處理廠商僅能符合至第二類型之再利用規定，導致底渣再利用用途受限，去化遭遇瓶頸，其中，若要達到第一類型之規定，其所需面臨之最大問題仍在於底渣中水溶性氯離子之含量，因此本研究期望藉由水洗之方式降低底渣中水溶性氯離子含量，達到脫氯之目的，以期提升再利用等級或再利用率，並以實廠化之成本效益進行考量。
本研究以液固比、滯留時間及添加酸洗液之濃度作為試驗之三大操作條件，研究發現前述操作參數之提高與水溶性氯離子削減效率成正相關。根據試驗分析結果發現若將各水洗槽採用不同之操作參數，其最佳之操作條件為以第一槽單槽滯留時間30min、液固比=3、酸洗液pH=2.3，第二槽以單槽滯留時間30min、液固比=3、酸洗液pH=2.9，第三槽以單槽滯留時間10min、液固比=1、酸洗液pH=2.3，第四槽以單槽滯留時間30min、液固比=2、酸洗液pH=2.9，其水溶性氯離子之削減率可達98.74%；另將研究成果應用於實際工程規劃，採用不同之操作條件概估以添加酸液之水洗方法處理底渣之成本約489元/噸。

關鍵字

底渣 ； 酸洗 ； 水溶性氯離子

並列摘要

Domestic incinerator bottom ash recycling since 2003 to promote, in recent years, the domestic provisions for bottom ash recycling and reuse are increasingly stringent, bottom ash recycling based on different quality standards can be divided into three types, but most of the domestic processing vendor only conform to the provisions of the second type of re-use, resulting in bottom ash recycling purposes limited to provenance bottlenecks, Which, in order to reach the first type provides, One of the biggest problems facing the still required at the end of the water-soluble chloride content of the bottom ash, the study expected by way of reducing the washing of water soluble chloride content of bottom ash, reaching dechlorination of Objective, in order to enhance the level of re-use or re-utilization, and cost-effectiveness of the real plant be considered.
In the study, liquid-solid ratio, residence time, and concentration of added acid lotion as a test of the three operating conditions, the study found the aforementioned operating parameters to improve the water-soluble chloride ions with a positive correlation between the reduction efficiency. According to the test results of the analysis showed that each wash tank using different operating parameters, Its best operating conditions for the retention time of 30min first slot, liquid-solid ratio = 3, add the acid concentration is equivalent to the acid pH =2.3, the second groove to Single residence time 30min , liquid-solid ratio = 3, add the acid concentration is equivalent to the acid pH = 2.9, the third slot to Single residence time 10min, liquid-solid ratio = 1, add the acid concentration is equivalent to the acid pH =2.3, the fourth slot to Single residence time 30min, liquid-solid ratio = 2, add the acid concentration is equivalent to the acid pH = 2.9, its water-soluble chloride was reduced rate of 98.74%; Another research results to practical engineering planning, such as the use of different operating conditions, costs about 489 dollar/ ton.

並列關鍵字

MSWI Bottom Ash ； Acid Washing ； Dechlorinate

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