To more efficiently treat the dredged contaminated sediment (DCS) with a high water content, this study proposes an integrated method (called PHDVPSS) that uses the solidifying/stabilizing (S/S) agents and prefabricated horizontal drain (PHD) assisted by vacuum pressure (VP). Using this method, dewatering and solidification/stabilization can be carried out simultaneously such that the treatment time can be significantly shortened and the treatment efficacy can be significantly improved. A series of model tests was conducted to investigate the effectiveness of the proposed method. Experimental results indicated that the proposed PHDVPSS method showed superior performance compared to the conventional S/S method that uses Portland cement (PC) directly without prior dewatering. The 56-day unconfined compressive strength of DCS treated by the proposed method with GGBS-MgO as the binder is 12–17 times higher than that by the conventional S/S method. DCS treated by the PHDVPSS method exhibited continuous decrease in leaching concentration of Zn with increasing curing age. The reduction of Zn leachability is more obvious when using GGBS-MgO as the binder than when using PC, because GGBS-MgO increased the residual fraction and decreased the acid soluble fraction of Zn. The microstructure analysis reveals the formation of hydrotalcite in GGBS-MgO binder, which resulted in higher mechanical strength and higher Zn stabilization efficiency.

为了更有效地处理高含水量的疏con污染沉积物（DCS），本研究提出了一种综合方法（PHDVPSS），该方法使用固化/稳定剂（S / S）和预制水平排水（PHD）并借助真空压力（副总裁）。使用该方法，可以同时进行脱水和固化/稳定化，从而可以显着缩短处理时间并且可以显着提高处理功效。进行了一系列模型测试，以研究该方法的有效性。实验结果表明，与直接使用硅酸盐水泥（PC）且无需事先脱水的常规S / S方法相比，所提出的PHDVPSS方法表现出卓越的性能。用GGBS-MgO作为粘合剂，所提出的方法处理的DCS的56天无侧限抗压强度比常规S / S方法高出12-17倍。用PHDVPSS方法处理的DCS随着固化时间的延长，锌的浸出浓度持续降低。使用GGBS-MgO作为粘合剂时，Zn浸出性的降低比使用PC时更为明显，因为GGBS-MgO增加了残留量，降低了Zn的酸溶性。微观结构分析表明，在GGBS-MgO粘结剂中形成了水滑石，从而提高了机械强度和锌的稳定效率。用PHDVPSS方法处理的DCS随着固化时间的延长，锌的浸出浓度持续降低。使用GGBS-MgO作为粘合剂时，Zn浸出性的降低比使用PC时更为明显，因为GGBS-MgO增加了残留量，降低了Zn的酸溶性。微观结构分析表明，在GGBS-MgO粘结剂中形成了水滑石，从而提高了机械强度和锌的稳定效率。用PHDVPSS方法处理的DCS随着固化时间的延长，锌的浸出浓度持续降低。使用GGBS-MgO作为粘合剂时，Zn浸出性的降低比使用PC时更为明显，因为GGBS-MgO增加了残留量，降低了Zn的酸溶性。微观结构分析表明，在GGBS-MgO粘结剂中形成了水滑石，从而提高了机械强度和锌的稳定效率。