Environmental impact of fluidized solidified silt casting on surrounding water bodies. Issue 5 (27th May 2020)

• Record Type: Journal Article
• Authors: Li, Yunquan; Zhu, Wei; Wu, Silin; Shu, Shi; Lv, Yiyan; Cui, Yan
• Is Part Of: Marine georesources & geotechnology. Volume 38:Issue 5(2020)
• Page Start: 604
• Page End: 610
• Publication Date: 2020-05-27
• Subjects: Solidified silt -- underwater casting -- pH -- turbidity -- heavy metals; Marine mineral resources -- Periodicals; 551.46
• DOI: 10.1080/1064119X.2019.1606126
• Languages: English
• ISSNs: 1064-119X

Abstract

Abstract: With the growing demand for underwater refill engineering, the construction technology of implementing fluidized solidification in underwater pouring has recently received increased attention. However, the environmental impact of underwater casting on surrounding water bodies, especially when the silt is polluted, is still unclear. In this study, a simulated underwater pouring test and a static immersion release test were conducted separately to study the quality of the surrounding water during and after pouring. The results showed that fluidized-solidified silt casting could increase the pH of the surrounding water, even after the pouring had stopped, by approximately 1.0 and the turbidity could reach 200 NTU. No diffusion of Zn and Cu into the surrounding water was observed and while Ni and Cr exhibited slight diffusion, this was at a level well below international water quality standard. During construction, reducing the distance from the seafloor to the bottom of the pouring catheter could reduce the level of pollution. After construction, the use of neutral solidified materials can effectively reduce the pH of the surrounding water and the potential risk of heavy metal dissolution.