Geomechanics and Engineering

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Effect of microbial biopolymers on the sedimentation behavior of kaolinite

  • Yeong-Man Kwon (Department of Civil and Environmental Engineering, Northwestern University) ;
  • Seok-Jun Kang (Department of Civil and Environmental Engineering, KAIST) ;
  • Gye-Chun Cho (Department of Civil and Environmental Engineering, KAIST) ;
  • Ilhan Chang (Department of Civil Systems Engineering, Ajou University)
  • Received : 2022.12.24
  • Accepted : 2023.03.21
  • Published : 2023.04.25
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Abstract

Clay sedimentation has been widely analyzed for its application in a variety of geotechnical constructions such as mine tailing, artificial islands, dredging, and reclamation. Chemical flocculants such as aluminum sulfate (Al2(SO4)3), ferric chloride (FeCl3), and ferric sulfate (Fe(SO4)3), have been adopted to accelerate the settling behaviors of clays. As an alternative clay flocculant with natural origin, this study investigated the settling of xanthan gum-treated kaolinite suspension in deionized water. The sedimentation of kaolinite in solutions of xanthan gum biopolymer (0%, 0.1%, 0.5%, 1.0%, and 2.0% in a clay mass) was measured until the sediment height was stabilized. Kaolinite was aggregated by xanthan gum via a direct electrical interaction between the negatively charged xanthan gum molecules and positively charged edge surface and via hydrogen bonding with kaolinite particles. The results revealed that the xanthan gum initially bound kaolinite aggregates, thereby forming larger floc sizes. Owing to their greater floc size, the aggregated kaolinite flocs induced by xanthan gum settled faster than the untreated kaolinite. Additionally, X-ray computed tomography images collected at various depths from the bottom demonstrated that the xanthan gum-induced aggregation resulted in denser sediment deposition. The findings of this study could inspire further efforts to accelerate the settling of kaolinite clays by adding xanthan gum.

Keywords

Acknowledgement

This research was financially supported by the Ministry of Oceans and Fisheries (MOF) of the Korean Government (Project No. 20220364), and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022R1A2C2091517).

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