Stimulation of Indigenous Carbonate Precipitating Bacteria for Ground Improvement
MetadataShow full item record
© Published under licence by IOP Publishing Ltd. Calcite minerals are precipitated in soil through biomineralisation which can be either organic or inorganic in nature. Biomineralisation can be employed to improve ground conditions in its natural state. Usually, studies of applied biomineralisation are highly interdisciplinary involving expertise from engineers, chemists and microbiologists. In this paper, we study the potential of biomineralisation from indigenous bacteria present in soil. The soil samples were collected from a high permeable zone and the bacteria that inhabit the soil were stimulated at a temperature of 15°C. A cementation solution consisting of 500mM calcium chloride, urea and nutrient broth at a pH of 7.5 was added to the soil samples. Inorganic precipitation was found to be dominant and was more efficient when compared to organic precipitation. Carbonate precipitation data indicated that inorganic precipitation were 1.37 times better at carbonate formation in comparison to organic precipitation. Scanning Electron Microscopy analysis identified cementation bonds formed between soil particles. It was deducted that organic precipitation is dependent on temperature, and may take an extended time at such low temperature. The preliminary data presented in this paper suggests that the implementation of biomineralisation with in-situ microbes is promising but requires further laboratory and field investigation before being considered for engineering application.
Showing items related by title, author, creator and subject.
Robson, T.; Stevens, Jason; Dixon, Kingsley; Reid, N. (2017)Recent studies suggest sulfur-accumulators (thiophores and gypsophiles) produce foliar gypsum (CaSO4 2H2O) as a novel biomineralogical tolerance mechanism against sulfate salinity and excess soluble calcium (e.g. gypsic ...
Lintern, Melvyn John (2011)Calcrete has been shown to contain significant Au, derived from nearby mineralisation, and this has led to its current use as an exploration sampling medium. Calcretes are secondary carbonates, principally consisting of ...
Visualizing Organophosphate Precipitation at the Calcite-Water Interface by in Situ Atomic-Force MicroscopyWang, L.; Qin, L.; Putnis, C.; Ruiz-Agudo, E.; King, H.; Putnis, Andrew (2016)Esters of phosphoric acid constitute a large fraction of the total organic phosphorus (OP) in the soil environment and, thus, play an important role in the global phosphorus cycle. These esters, such as glucose-6-phosphate ...