改性地聚物CG固化/稳定化重金属污染底泥室内试验研究  

Solidification and Stabilization of Heavy Metal Contaminated Sediment by Modified Geopolymer CG

作　　者：廖斯汉 蔡燕燕[2] 林毅华 廖言丰 李剑峰 LIAO Sihan;CAI Yanyan;LIN Yihua;LIAO Yanfeng;LI Jianfeng(Fujian Constructian Engineering Group Company Limited,Fuzhou,Fujian 350025,China;School of Civil Engineering,Huaqiao University,Xiamen,Fujian 361021,China)

机构地区：[1]福建建工集团有限责任公司,福建福州350025 [2]华侨大学土木工程学院,福建厦门361021

出　　处：《水利与建筑工程学报》2025年第2期25-31,73,共8页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金(52278351)。

摘　　要：为增强地质聚合物(GP)替代水泥(OPC)固化/稳定化重金属污染底泥(污泥)的作用效果。通过引入天然高分子聚合物壳聚糖(CS)改性碱激发矿渣、粉煤灰地聚物合成新型固化剂(CG),并以OPC为对照组通过室内试验研究固化/稳定化污泥的无侧限抗压强度、抗氯盐侵蚀、重金属浸出特性以及固化/稳定化机理。结果表明:CG固化污泥的强度随着CS掺量的增加呈先上升后下降的趋势,且在任意龄期下均大于OPC;在氯盐干湿循环条件下,CG固化后的污泥强度、质量损失和表观劣化程度均小于OPC;CG稳定化重金属作用明显优于OPC,显著降低了Cu、Zn的浸出浓度;GP会产生大量水化产物来胶结和填充污泥颗粒间的孔隙,形成致密的骨架结构,提升强度。同时,CS能够形成薄膜状物质团聚污泥颗粒,并且通过吸附、螯合、化学结合和配位等作用,增强了GP固化/稳定化污泥的作用效果。To enhance the effect of geopolymer(GP)instead of cement(OPC)on solidification and stabilization of heavy metal contaminated sludge(sludge).Synthesis of new curing agent(CG)by introducing natural high polymer chitosan(CS)modified alkali to stimulate the terpolymers of slag and fly ash,and OPC was used as the control group to evaluate the unconfined compressive strength,chlorine salt erosion resistance,heavy metal leaching characteristics and curing/stabilizing mechanism of solidified/stabilized sludge.The results show that the strength of CG solidified sludge increases first and then decreases with the increase of CS content,and is greater than OPC at any age.The strength,mass loss and apparent deterioration of the sludge after CG curing were less than those of OPC under the condition of chloride dry and wet cycle.The stabilization of heavy metals by CG was better than that by OPC,and the leaching concentrations of Cu and Zn were significantly reduced.GP will produce a large number of hydration products to cement and fill the pores between the sludge particles to form a dense skeleton structure and improve strength.At the same time,CS can form filament-like aggregate sludge particles,and enhance the effect of GP solidification and stabilization of sludge through adsorption,chelation,chemical binding and coordination.

关 键 词：地质聚合物 固化/稳定化 重金属污染 无侧限抗压强度 浸出浓度 

分 类 号：TU528.7[建筑科学—建筑技术科学]