添加污泥抑制飛灰熱處理過程之戴奧辛再生成效率探討;Effectiveness of Applying Sewage Sludge as PCDD/F Formation Inhibitor in Thermal Treatment of Fly Ash

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Title:	添加污泥抑制飛灰熱處理過程之戴奧辛再生成效率探討;Effectiveness of Applying Sewage Sludge as PCDD/F Formation Inhibitor in Thermal Treatment of Fly Ash
Authors:	謝長樺;Hsieh, Chang-Hua
Contributors:	環境工程研究所
Keywords:	戴奧辛;熱裂解;抑制劑;都市垃圾焚化爐;脫氯反應;Dioxin;Thermal pyrolysis;Inhibitors;Municipal solid waste incineration;Dechlorination
Date:	2022-07-27
Issue Date:	2022-10-04 12:24:02 (UTC+8)
Publisher:	國立中央大學
Abstract:	隨著人口持續成長以及科技的高度發展，都市固體廢棄物（Municipal Solid Waste，簡稱MSW）及事業廢棄物（Industrial Waste，簡稱IW）的處理處置問題也日趨嚴重。都市固體廢棄物焚化量的增加意味將有大量焚化飛灰產生，因為飛灰含有毒物質如戴奧辛及重金屬等，需經過適當處理才能進行處置或再利用。本研究以生活污泥為抑制劑應用於飛灰熱裂解，以提高都市固體廢棄物焚化爐飛灰中 PCDD/Fs的破壞效率。結果表明水洗後飛灰之氯含量由原本的16.48 ± 0.78 wt% 降低至10.45 ± 0.56 wt%，顯示水洗可有效降低飛灰中的氯化物含量，也提升飛灰熱解過程PCDD/Fs的破壞效率。污水污泥經加熱產生之硫氧化物及氮化合物可毒化催化金屬及佔據催化點位，有效抑制前驅物異相催化反應與De Novo synthesis反應，降低PCDD/Fs生成。350℃之熱裂解結果顯示添加不同比率之污泥對PCDD/Fs之質量濃度去除率皆達99%以上、毒性當量濃度去除率則皆達96%以上。綜合三種溫度（即250℃、300℃及350℃）與不同WFA/DSS質量比結果得知最佳條件為350F5S5，在反應5分鐘後毒性當量濃度降至0.89 ng I-TEQ/g-WFA，符合國內法規限值。250F1S0、300F1S0及350F1S0的實驗結果顯示於250 ~ 400℃之溫度區間是De Novo synthesis反應劇烈生成區間，且反應溫度降低使熱裂解效率降低，使De Novo synthesis反應速率提升。在350F5S5條件下由不同反應時間之測試結果顯示系統之操作時間控制於10分鐘可達歐盟最終廢棄物再利用標準（European End of Waste criteria, 20 pg TEQ/g）;With the continuous growth of population and high development of technology, many environmental pollution problems including the disposal of municipal solid waste (MSW) and industrial waste (IW) have arisen. With increasing municipal solid waste being incinerated, the amount of fly ash generated will also increase. Because fly ash contains various toxic substances, it needs to be treated before disposal or reuse. Water washing and suppression via pyrolysis can improve the destruction efficiency of PCDD/Fs in fly ash generated from municipal solid waste incinerators. The results showed that after washing the chloride content of fly ash was reduced from 16.48 ± 0.78 wt% to 10.45 ± 0.56 wt%. Since sulfur oxides and nitrogen-containing compounds generated by the heating of sewage sludge poison the catalytic metals and occupy the active sites, they can effectively inhibit precursor formation and De Novo synthesis reaction, and PCDD/F concentration was reduced. The results of the pyrolysis temperature at 350℃ show that the PCDD/F reduction efficiency based on mass concentration are all over 99% and the reduction efficiency based on TEQ concentration are all over 96% under each operating condition. Based on the results of different WFA/DSS mass ratios at three temperatures, the best condition is 350F5S5, and the TEQ concentration was reduced to 0.89 ng I-TEQ/g-WFA with 5 minutes of reaction. The results of 250F1S0, 300F1S0, and 350F1S0 showed that the De Novo synthesis reaction was significant at 250~400 ℃, and decreasing reaction temperature is favorable for De Novo synthesis reaction. The results obtained for 350F5S5 of different reaction times show that extending the reaction time to 10 minutes can further reduce PCDD/F TEQ concentration to meet the European End of Waste criteria (20 pg TEQ/g).
Appears in Collections:	[Graduate Institute of Environmental Engineering ] Electronic Thesis & Dissertation

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