Feasibility Study of Low-Environmental-Load Methods for Treating High-Water-Content Waste Dredged Clay (WDC)—A Case Study of WDC Treatment at Kumamoto Prefecture Ohkirihata Reservoir in Japan

Zichen Zhang, Cui Li (), Kiyoshi Omine, Jiageng Li and Samuel Oye Flemmy
Additional contact information
Zichen Zhang: Department of School of Architecture & Civil Engineering, University of Liaocheng, Liaocheng 252000, China
Cui Li: Department of School of Architecture & Civil Engineering, University of Liaocheng, Liaocheng 252000, China
Kiyoshi Omine: Department of Graduate School of Engineering, University of Nagasaki, Nagasaki 8528521, Japan
Jiageng Li: Department of Graduate School of Engineering, University of Nagasaki, Nagasaki 8528521, Japan
Samuel Oye Flemmy: Department of Graduate School of Engineering, University of Nagasaki, Nagasaki 8528521, Japan

Sustainability, 2023, vol. 15, issue 10, 1-14

Abstract: The effective and sustainable treatment of high-water-content waste dredged clay (WDC) remains a significant challenge in water conservancy engineering. In this study, we focused on the treatment of WDC produced by Kumamoto Ohkirihata Reservoir. The study examined the effect of two types of cement-based solidifiers, namely, ordinary Portland cement (OPC) and cement–fly ash agent (DF), on three clay samples collected from different locations. The cone index test was used to assess the samples’ properties. The dosage of cement required for effective improvement with DF was significantly reduced (by about 47–55%), compared to OPC. Moreover, the dewatering efficiency of WDC improved by the simple dewatering method of vertically placing environmental protection materials. Within seven days, the average water content of the WDC decreased to below the liquid limit compared with natural air drying. Finally, the dosage of DF required to stabilize the WDC under effective improvement conditions was reduced by 37–58%, which is higher than the dosage of OPC reduction (22–50%). The reduction in water content reduced the pore space of the soil particles, benefiting the internal bonding of DF-stabilized clay. Dewatering methods facilitate the use of DF solidifiers, facilitating sustainable and environmentally friendly improvement in WDC.

Keywords: waste dredged clay; solidifying agent; reutilization; dewatering method; stabilized clay (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/15/10/8243/pdf (application/pdf)
https://www.mdpi.com/2071-1050/15/10/8243/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:15:y:2023:i:10:p:8243-:d:1150371

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().