Figure 8
Test results with added gypsum powder. (a) \({\text{SO}}_{4}^{2 - }\) removal efficiency and CaCO3 production rate within the crude urease triggered EICP solution. CaCO3 contents were obtained after 6 days (EICP 3 days + reaction 3 days) and \({\text{SO}}_{4}^{2 - }\) removal efficiency was measured after 1 day \({\text{SO}}_{4}^{2 - }\) reaction. (b) \({\text{SO}}_{4}^{2 - }\) removal efficiency with increasing \({\text{SO}}_{4}^{2 - }\) reaction time.
