燃煤飛灰與磷酸塩類螯合劑對含汞廢污泥固化／穩定化處理之效能研究

Performance Evaluation of Coal Burning Fly Ash and Phosphate Chelating Agents to Sludge Containing Mercury with Solidification and Stabilization Processes

曾志宏(Chih-Hung Tseng)

指導教授 ： 黃益助

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2012年)

https://doi.org/10.6346/NPUST.2012.00260

摘要

摘要

本研究主要探討於水泥固化劑內添加具卜作嵐反應之燃煤飛灰，對固化體抗壓強度增加之影響。研究結果顯示，於水泥固化劑內添加15%以上燃煤飛灰(水泥重量比)，其7天、14天之抗壓強度與未添加燃煤飛灰試體強度相近；惟其28天時之抗壓強度，則高出約9 kg cm-2。另為瞭解現行市售螯合劑對含汞廢污泥之螯合效果，採用高鹼性與強酸性之螯合劑進行對比實驗，結果發現屬於鹼性之硫磺成份有機性螯合劑，不論添加配比或混拌程度，均無法有效阻隔含汞廢污泥汞之溶出。而對添加磷酸塩類螯合劑之固化體經毒性特性溶出試驗，未添加燃煤飛灰之總汞溶出濃度，約在0.0035～0.0095 mg L-1；而添加燃煤飛灰之總汞溶出濃度，則在0.00038～0.0045 mg L-1，均低於法規限值0.025 mg L-1。研究結果顯示含汞廢污泥採固化/穩定化方式處理時，可於水泥固化劑中添加至少15%以上之燃煤飛灰，除可提高固化體衍生物之長期強度外，亦可增加Ca2+的釋出量進而達成阻礙元素Hg及其他形式Hg之移動現象，降低固化/穩定化含汞廢污泥之汞溶出性。

關鍵字：含汞廢污泥、燃煤飛灰、固化/穩定化、毒性特性溶出試驗

關鍵字

含汞廢污泥 ； 燃煤飛灰 ； 固化/穩定化 ； 毒性特性溶出試驗

並列摘要

Abstract

The aim of this research is to study the effects of addition of coal burning fly ash (CBFA) into concrete on compressive strength of solidified specimens. The results showed that the compressive strength of the 7- and 14-day solidified specimens for addition of at least 15% weight ratio of CBFA into concrete was almost the same as that without addition of CBFA. However, it was 9 kg cm-2 higher for addition of 15% of CBFA. The other study is to understand the current commercially available chelating agents on the chelating effect of the mercury-containing waste sludge, especially with high alkaline and strongly acidic ones. The results showed that the organic chelator composed of alkaline sulfur, regardless of addition ratios or blending levels, did not effectively prevent the Hg leaching from the mercury-containing waste sludges. Addition of phosphate chelator, the leaching Hg concentrations via toxicity characteristic leaching procedure test were around 0.0035 - 0.0095 and 0.00038 - 0.0045 mg L-1 for solidified specimens with and without addition of CBFA, respectively. The leaching Hg concentrations are all below the regulated criterion of 0.025 mg L-1. From this study, addition of at least 15% CBFA into concrete can not only enhance the long-term compressive strength but also reduce the mobility of Hg compounds by raising the release amounts of Ca2+ to further lower the leachability of Hg from the solidified/stabilized derivatives.

Keywords: waste containing mercury, coal burning fly ash, solidification/stabilization, toxicity characteristic leaching procedure.

並列關鍵字

waste containing mercury ； coal burning fly ash ； solidification/stabilization ； toxicity characteristic leaching procedure

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