Mineralization Process of Biocemented Sand and Impact of Bacteria and Calcium Ions Concentrations on Crystal Morphology

Figure 11

SEM micrographs of CaCO₃ crystals under different bacterial suspensions and calcium concentrations ((A-1)–(A-5), OD₆₀₀ = 0.25 and Ca²⁺ concentration () = 0.25, 0.50, 0.75, 1.00, and 1.50 mol/L, resp.; (B-1)–(B-5), OD₆₀₀ = 0.50 and Ca²⁺ concentration () = 0.25, 0.50, 0.75, 1.00, and 1.50 mol/L, resp.; (C-1)–(C-5), OD₆₀₀ = 1.00 and Ca²⁺ concentration () = 0.25, 0.50, 0.75, 1.00, and 1.50 mol/L, resp.; (D-1)–(D-5), OD₆₀₀ = 1.50 and Ca²⁺ concentration () = 0.25, 0.50, 0.75, 1.00, and 1.50 mol/L, resp.; (E-1)–(E-5), OD₆₀₀ = 2.00 and Ca²⁺ concentration () = 0.25, 0.50, 0.75, 1.00, and 1.50 mol/L, resp.).