Controlled sintering for cadmium stabilization by beneficially using the dredged river sediment

Xia，Yunxue1,2; Qiu，Dong1; Lyv，Zhong1; Zhang，Jianshuai1; Singh，Narendra3; Shih，Kaimin2; Tang，Yuanyuan1

2023-05-01

10.1007/s11783-023-1661-9

Frontiers of Environmental Science & Engineering   影响因子和分区

2095-2201

2095-221X

Cd-bearing solid wastes are considered to be a serious threat to the environment, and effective strategies for their treatment are urgently needed. Ceramic sintering has been considered as a promising method for efficiently incorporating heavy metal-containing solid wastes into various ceramic products. Mineral-rich dredged river sediment, especially Al and Si-containing oxides, can be treated as alternative ceramic precursors rather than being disposed of as solid wastes. To examine the feasibility of using waste sediment for Cd stabilization and the phase transition mechanisms, this study conducted a sintering scheme for the mixtures of CdO and dredged river sediment with different (Al+Si):Cd mole ratios. Detailed investigations have been performed on phases transformation, Cd incorporation mechanisms, elemental distribution, and leaching behaviors of the sintered products. Results showed that Cd incorporation and transformation in the sintered products were influenced by the mole ratio of (Al+Si):Cd. Among the high-Cd series ((Al+Si):Cd = 6:1), CdSiO, CdSiO, CdAl(SiO) and CdAlSiO were predominant Cd-containing product phases, while CdAlSiO was replaced by CdAlO when the mole ratio of (Al+Si):Cd was 12:1 (low-Cd series). Cd was efficiently stabilized in both reaction series after being sintered at ⩾ 900 °C, with < 5% leached ratio even after a prolonged leaching time, indicating excellent long-term Cd stabilization. This study demonstrated that both Cd-containing phases and the amorphous Al-/Si-containing matrices all played critical roles in Cd stabilization. A promising strategy can be proposed to simultaneously reuse the solid waste as ceramic precursors and stabilize heavy metals in the ceramic products. [Figure not available: see fulltext.].

Cadmium Dredged river sediments Leaching Sintering Stabilization

SCI ; EI

英语

第一 ; 通讯

null[2018YFC1902904] ; null[21707063] ; null[41977329] ; null[T21-771/16R] ; null[2017B030301012]

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:000895864400001

HIGHER EDUCATION PRESS

20225113277228

Cadmium ; Cadmium compounds ; Dredging ; Leaching ; Molar ratio ; Rivers ; Sediments ; Silicon ; Silicon compounds ; Sintering ; Solid wastes

Soil Mechanics and Foundations:483 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Physical Chemistry:801.4 ; Chemical Operations:802.3

2-s2.0-85144106918

Scopus

1.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Civil Engineering,Faculty of Engineering,The University of Hong Kong,999077,Hong Kong
3.Environmental Science Center,Decarbonisation and Resource Managemental,British Geological Survey,Nottinghamshire, Keyworth,NG12 5GG,United Kingdom

Xia，Yunxue,Qiu，Dong,Lyv，Zhong,et al. Controlled sintering for cadmium stabilization by beneficially using the dredged river sediment[J]. Frontiers of Environmental Science & Engineering,2023,17(5).

Xia，Yunxue.,Qiu，Dong.,Lyv，Zhong.,Zhang，Jianshuai.,Singh，Narendra.,...&Tang，Yuanyuan.(2023).Controlled sintering for cadmium stabilization by beneficially using the dredged river sediment.Frontiers of Environmental Science & Engineering,17(5).

Xia，Yunxue,et al."Controlled sintering for cadmium stabilization by beneficially using the dredged river sediment".Frontiers of Environmental Science & Engineering 17.5(2023).