本研究嘗試應用無機聚合物技術，在改變不同鹼活化劑之種類(如KOH及NaOH)及濃度(6M及12M)，以及添加10%-50%偏高嶺土，藉以調整反應材料間之矽鋁比等條件，評估受重金屬污染底泥之穩定化成效。研究結果顯示，添加偏高嶺土可有效提升無機聚合物的機械性能，且可以有效穩定重金屬之溶出行為，其中12M NaOH鹼性活化劑之試驗條件，當偏高嶺土添加比例由10%增加至50%時，無機聚合物之試體抗壓強度，由幾近於無強度增加至52.88±2.68 kgf/cm2。根據無機聚合物重金屬序列萃取之穩定化成效分析結果顯示，以12M鹼性活化劑NaOH及添加50 %偏高嶺土的試驗條件為例，底泥中Zn之不穩定相態比例由1.96，降低至無機聚合物試體之0.08。此外，無機聚合物試體之重金屬毒性溶出濃度分析結果，亦均遠低於法規管制標準。整體而言，根據本研究初步成果，已成功驗證無機聚合物技術，可有效降低底泥重金屬之溶出濃度，達到重金屬穩定化之效果。;This research investigates the feasibility of heavy metal stabilization of sediment contaminated metals by geopolymer with changing different alkali activator types (e.g. KOH and NaOH) with different concentration (e.g. 6M and 12M). Meanwhile, to adjust the silica-to-aluminum (Si/Al ratio) ratio with controlling 10%~50% metakaolin addition was also discussed. The experimental results showed that adding metakaolin addition could effectively improve the geopolymer mechanical properties and stabilize the heavy metals leaching behavior. In the case of 12M NaOH alkaline activator addition, the compressive strength of geopolymer was increased from nearly zero to 52.88±2.68 kgf/cm2 with metakaolin addition increasing from 10% to 50%. According to the sequential extraction analysis results, in the case of 12M NaOH alkaline activator and 50% metakaolin addition, the unstable Zn fraction of the contaminated sediment was decreased from 1.96 to 0.08. Meanwhile, the toxicity characteristics leaching procedure (TCLP) concentration results of tested heavy metal in the geopolymer was lower than that of the relevant regulations thresholds. In summary, based on the preliminary results of this research, it has been successfully verified that the geopolymer technology could effectively reduce the leaching concentration of heavy metals in sediments and achieve the heavy metals stabilization.
