Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-Ku, Sapporo, 060-8628, Japan.
Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-Ku, Sapporo, 060-8628, Japan.
Environ Sci Pollut Res Int. 2019 May;26(15):15653-15664. doi: 10.1007/s11356-019-04984-8. Epub 2019 Apr 4.
Biocementation of hazardous waste is used in reducing the mobility of contaminants, but studies on evaluating its efficacy have not been well documented. Therefore, to evaluate the efficacy of this method, physicochemical factors affecting stabilized hazardous products of in situ microbially induced calcium carbonate precipitation (MICP) were determined. The strength and leach resistance were investigated using the bacterium Pararhodobacter sp. Pb-contaminated kiln slag (KS) and leach plant residue (LPR) collected from Kabwe, Zambia, were investigated. Biocemented KS and KS/LPR had leachate Pb concentrations below the detection limit of < 0.001 mg/L, resisted slaking, and had maximum unconfined compressive strengths of 8 MPa for KS and 4 MPa for KS/LPR. Furthermore, biocemented KS and KS/LPR exhibited lower water absorption coefficient values, which could potentially reduce the water transportation of Pb. The results of this study show that MICP can reduce Pb mobility in mine wastes. The improved physicochemical properties of the biocemented materials, therefore, indicates that this technique is an effective tool in stabilizing hazardous mine wastes and, consequently, preventing water and soil contamination.
生物固化技术被用于降低污染物的迁移性，但评估其效果的研究尚未得到充分记录。因此，为了评估该方法的效果，确定了影响原位微生物诱导碳酸钙沉淀（MICP）稳定危险产物的物理化学因素。使用从赞比亚卡布韦收集的受 Pb 污染的窑渣（KS）和浸出厂残渣（LPR）中的细菌 Pararhodobacter sp. 对生物固化的 KS 和 KS/LPR 的强度和抗浸出性进行了研究。生物固化的 KS 和 KS/LPR 的浸出液 Pb 浓度低于检测限 < 0.001 mg/L，抗消解，KS 的最大无侧限抗压强度为 8 MPa，KS/LPR 的最大无侧限抗压强度为 4 MPa。此外，生物固化的 KS 和 KS/LPR 表现出较低的吸水率系数值，这可能会降低 Pb 的水迁移。本研究结果表明，MICP 可以降低矿山废物中的 Pb 迁移性。因此，生物固化材料的物理化学性质得到改善，表明该技术是稳定危险矿山废物的有效工具，从而防止水和土壤污染。
