Compatibility of Landfill Leachate with Compacted Biocemented Lateritic Soil Through Microbial Induced Calcite Precipitation Technique

Kolawole J Kolawole, Gadzama W Emmanuel, A. Eberemu, T. S. Ijimdiya
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Abstract

A new soil improvement method known as microbial induced calcite precipitation (MICP) has received tremendous attention of researchers in the related fields. This paper reports the results of the compatibility of compacted bio-cemented lateritic soil with municipal solid waste (MSW) leachate. Lateritic soil was treated with Sporosarcina pasteurii (S. pasteurii) suspension densities up to 2.40 x 10 cells/ml and compacted using British Standard light, BSL (or standard Proctor) energy. The permeation with leachate only yielded minimum hydraulic conductivity values of 5.02 x 10 m/s for the natural soil and 5.78 x 10 m/s for specimen treated with S. pasteurii suspension density of 2.40 x 10 cells/ml. The micrographs of specimens treated with S. pasteurii suspension density of 2.40 x 10 cells/ml and permeated with leachate only depicted the development of bio-film when compared with micrograph of the untreated soil. Test results showed significant reduction in the concentration of the MSW leachate chemical specie considered after interaction with S. pasteurii for 150 days either through bio-transformation or bio-degradation process.
利用微生物诱导方解石沉淀技术研究垃圾渗滤液与生物胶结红土的相容性
微生物诱导方解石降水(microinduced calcite precipitation, MICP)是一种新的土壤改良方法,受到了相关领域研究人员的广泛关注。本文报道了生物胶结红土与城市生活垃圾渗滤液的相容性研究结果。用巴氏孢弧菌(S. pasteurii)悬浮浓度高达2.40 × 10个细胞/ml处理红土,并使用英国标准光,BSL(或标准Proctor)能量压实。在自然土壤中,渗滤液渗透产生的最低水导率值为5.02 × 10 m/s,而在巴氏杆菌悬浮浓度为2.40 × 10个细胞/ml的样品中,渗透产生的最低水导率值为5.78 × 10 m/s。巴氏杆菌悬浮液浓度为2.40 × 10个细胞/ml并渗透渗滤液的样品的显微照片与未处理土壤的显微照片相比,仅描述了生物膜的发育。测试结果表明,通过生物转化或生物降解过程,与巴氏杆菌相互作用150天后,城市生活垃圾渗滤液中所考虑的化学物质的浓度显著降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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