| Autor: |
Zhang, Peng, Liu, Ming, Yang, Yang, Liu, Haijun, Gao, Xuecheng, Cheng, Liang |
| Předmět: |
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| Zdroj: |
Acta Geotechnica; Jun2024, Vol. 19 Issue 6, p4217-4226, 10p |
| Abstrakt: |
This study presents a novel method for seepage control in calcareous sand using microbially induced Ca-Alginate polymeric sealant, which was achieved by the reaction between supplied alginate and microbially induced Ca2+ ions directly derived from calcareous sand. This approach includes two steps: (i) microbially induced soluble Ca2+ generated inside the pores of calcareous sand through a bio-acidification process using activated sludge and (ii) reacting with supplied alginate to form Ca-alginate polymeric sealant via the in situ gelation. With the effect of Ca-alginate polymeric sealant, the seepage rate of the calcareous sand was intensely decreased to the level of 10–9 m/s from an initial 10–4 m/s when 5 g/L of alginate was applied. In this way, a low seepage rate of calcareous sand was achieved which was able to remove heavy metal ions and suspended solids from the wastewater sludge. A model test was also carried out to assess the erosion resistance of Ca-alginate treated calcareous sand dam subjected to wave attack. Built on the current research, the proposed polymeric sealant is a promising method for the reduction of seepage, formation barriers for coastal construction on the island, and remediation of specific contaminants. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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