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- Title
Investigations on biosorption and biogenic calcite precipitation in sands.
- Authors
Shashank, Bettadapura S.; Kuntikana, Ganaraj; Jiang, Ning‐Jun; Singh, Devendra N.; Hou, Deyi
- Abstract
Soils are a host to several micro‐organisms which are responsible for various biogeochemical processes prevailing in the geoenvironment. Such processes have been utilized to alter engineering properties of the coarse‐grained soils viz., sands, such as strength, liquefaction potential and permeability. One of such processes, which has been explored by several researchers, is Biogenic Calcite Precipitation (BCP) in the coarse‐grained soils. Though the impact of biogenic calcite (BC) on engineering behaviour of sands has been dealt with in great detail, the mechanism of calcite 'growth' on their surface, which primarily depends on biosorption (i.e. attachment of bacterial cells), has not been investigated and/or discussed in detail. It should be noted that biosorption would strongly depend upon the overall surface characteristics of the sand grains, apart from their chemico‐mineralogical characteristics. Unlike fine‐grained soils, where the bacteria‐soil interaction is being investigated extensively by researchers, the above‐referred studies on sands have been pretermitted, largely. With this in view, an attempt has been made to investigate the mechanisms associated with the interaction of bacterial cells with sand grains and BC substrates, which is a precursor for the biogeochemical processes such as BCP, bioremediation and biological degradation of soils. Highlighting the role of key factors in bacterial cell‐sand interactions, a conceptual model has been proposed for the growth of biogenic calcite around a sand grain. Such a fundamental study, conducted by employing Atomic Force Microscopy and Extended Derjaguin‐Landau‐Verwey‐Overbeek (ExDLVO) theory, provides an insight into the biosorption on sands and BC.
- Subjects
CALCITE; ATOMIC force microscopy; SAND; SOIL degradation; BACTERIAL adhesion; BIODEGRADATION
- Publication
Soil Use & Management, 2021, Vol 37, Issue 4, p772
- ISSN
0266-0032
- Publication type
Article
- DOI
10.1111/sum.12611