An integrated method for the rapid dewatering and solidification/stabilization of dredged contaminated sediment with a high water content

doi:10.1007/s11783-020-1359-1

Front. Environ. Sci. Eng.

2021, Vol. 15

Issue (4) : 67 https://doi.org/10.1007/s11783-020-1359-1

RESEARCH ARTICLE

An integrated method for the rapid dewatering and solidification/stabilization of dredged contaminated sediment with a high water content

Hefu Pu¹, Aamir Khan Mastoi^1,², Xunlong Chen¹(

), Dingbao Song¹, Jinwei Qiu¹, Peng Yang¹

¹. Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
². Department of Civil Engineering, Quaid-e-Awam University of Engineering, Sciences and Technology, Sindh 67450, Pakistan

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Abstract

• An integrated method, called PHDVPSS, was proposed for treating DCS.

• The PHDVPSS method showed superior performance compared to conventional method.

• Using the method, water content (%) of DCS decreased from 300 to<150 in 3 days.

• The 56-day UCS from this method is 12‒17 times higher than conventional method.

• Relative to PC, GGBS-MgO binder yielded greater reduction in the leachability.

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.

Keywords Dredged contaminated sediment Dewatering Solidification/stabilization Vacuum preloading Prefabricated horizontal drain Heavy metal

Corresponding Author(s): Xunlong Chen

Issue Date: 27 October 2020

Cite this article:

Hefu Pu,Aamir Khan Mastoi,Xunlong Chen, et al. An integrated method for the rapid dewatering and solidification/stabilization of dredged contaminated sediment with a high water content[J]. Front. Environ. Sci. Eng., 2021, 15(4): 67.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-020-1359-1
https://academic.hep.com.cn/fese/EN/Y2021/V15/I4/67

Fig.1 PVD in traditional VP method: (a) Traditional PVD-based vacuum dewatering method, (b) Serious bending and deformation of PVD after use (Reprinted from Cai et al., (2017), with permission from Elsevier. Copyright (2017)).

Tab.1 Physicochemical properties and chemical compositions of the materials

Fig.2 The proposed integrated PHDVPSS method: (a) Procedure for the integrated PHDVPSS method, (b) Model test apparatus for the treatment method, (c) Model test of the method to treat DCS.

Fig.3 Water content vs. time during vacuum dewatering.

Fig.4 UCS vs. Zn concentration.

Fig.5 Leaching concentration vs curing time.

Fig.6 Distribution and speciation of Zn in the untreated and treated DCS samples: (a) Initial Zn concentration= 400 mg/kg, (b) Initial Zn concentration= 800 mg/kg, (c) Initial Zn concentration= 1600 mg/kg.

Fig.7 XRD results of DCS treated by VP-GM and VP-PC after 28 days of curing: (a) 800-VP-GM, (b) 800-VP-PC, (c) 1600-VP-GM, and (d) 1600-VP-PC.

Fig.8 Microstructure of DCS treated by VP-GM and VP-PC after 28-day of curing: (a) 800-VP-GM, (b) 800-VP-PC, (c) 1600-VP-GM, and (d) 1600-VP-PC.

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