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  • 學位論文

垃圾焚化底渣資源化處理之研究—水溶性氯離子去除成效

A Study on Recovery Treatment for MSWI Bottom Ash – Dechlorinate Performance

指導教授 : 章裕民
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摘要


目前國內外都市垃圾焚化底渣資源化再利用的比例逐年升高,而台灣垃圾底渣資源化所需面臨之問題仍是底渣本身之氯離子含量過高,故本研究主要著重於 底渣中氯離子含量,探討經加藥水洗處理後之垃圾焚化底渣再利用作為符合第一類管制標準之可行性。由實驗結果可知,對於水溶性氯離子濃度之去除效率,除了滯留時間以及液固比為主要之影響因子之外,酸液濃度也是非常重要的影響因子之一,隨著添加酸液濃度的增加,底渣水溶性氯離子的去除成效也隨著上升。 由本研究結果可推估在經過L/S=3四段連續式加酸水洗,每槽滯留時間30 min及酸液濃度(pH約等於2.30)的情況下可將垃圾焚化底渣中水溶性氯離子濃度值由0.889 % 降低至0.018 %,符合法規第一類標準規範,並應用於取代部分砂石粒料。就工程成本分析上,以處理500 (噸/天) 底渣所需之成本概估約35元/噸,經處理過後可用作取代砂石粒料之有價產品約為70噸,以目前市售價格 (保守估計250元/噸),此整體處理成本效益,在支出收入方面達到平衡不至於虧損的運作下,達到底渣資源化之目的,作為再生級配料運用在第一類再利用類型之產品。

並列摘要


Currently the domestic incineration bottom ash reuse proportion elevates year after year, and the bottom ash resources to achieve the first type of EPA regulatory standards required to face the problem is high chloride content of bottom ash. This research focus on the chloride content in bottom ash. Investigate to increase the acidic medicament by washing in elimination bottom ash and reuse as feasibility of the first type of EPA regulatory.For removal efficiency of water-soluble chloride concentration. In addition to the retention time and liquid-solid ratio are the main factor, acid concentration is one of important factor. As acid concentration increases, effectiveness of the removal of chloride ions increases. By the experimental results showed that water-soluble chloride ion concentration for the removal efficiency, operating conditions 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 0.893% from 0.020 %, achieve the first type of EPA regulatory standards, it can be used as gravel aggregate material in concrete applications, according to this study initially estimate cost of this work is 17,500 dollars / 500 ton, approximately 70 tons as gravel aggregates, the current price in the market is about 250 dollars each ton.Uunder equilibrium conditions,achieve the resource of MSWI Bottom ash as gravel aggregate material

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