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• W2622342028 endingPage "531" @default.
• W2622342028 startingPage "524" @default.
• W2622342028 abstract "Microbially induced CaCO3 precipitation (MICP) via urea hydrolysis is an emerging technique for soil amelioration, building materials rehabilitation and pollutants sequestration amongst other various environmental applications. The successful application of MICP requires the sustainability of the precipitated CaCO3; to which the fate of ammonia, the main by-product of ureolysis, is potentially significante. Ammonia volatilization and biological ammonia oxidation both induce a pH decrease, which, in turn, might cause CaCO3 dissolution. To examine the potential effect of accumulated ammonia on precipitated CaCO3, we conducted a long-term MICP batch experiment, using environmental enrichment cultures of ureolytic bacteria. Here we show that CaCO3 precipitation was completed within 15-27 days, along with a rise in ammonium concentration. Following completion of ureolysis and precipitation, ammonium concentrations decreased, leading to a pH decrease. About 30 days after precipitation was completed, as much as 30% CaCO3 dissolution, was observed. A two-step model, describing urea hydrolysis followed by the removal of ammonia from the precipitation solution, predicted CaCO3 dissolution due to ammonia volatilization. We suggest that ureolytic MICP might result in ammonia volatilization, leading to significant CaCO3 dissolution. These results provide basic insights into the sustainability of ureolytic MICP and should further encourage removal of the accumulated ammonia from the treated site." @default.
• W2622342028 created "2017-06-15" @default.
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• W2622342028 date "2017-10-01" @default.
• W2622342028 modified "2023-10-18" @default.
• W2622342028 title "Long-term sustainability of microbial-induced CaCO3 precipitation in aqueous media" @default.
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• W2622342028 doi "https://doi.org/10.1016/j.chemosphere.2017.06.015" @default.
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