Bio-mediated treatment of organic soil with fungal strain Penicillium Chrysogenum and wood fly ash

用真菌菌株产黄青霉和木粉煤灰生物介导处理有机土壤

• 批准号: 576746-2022
• 负责人: Siddiqua, SumiS
• 金额: $ 1.82万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=761740
• 关键词: Bio; mediated; treatment; organic; soil

Organic soil is one of the vulnerable kinds of soil found in Canada which occupies almost 18% of its total landmass. Poor shear strength and compressibility properties and high creep behaviour are some of the characteristics of such soil. Construction works done above such soil lead to the failure of those structures. Therefore, they must be improved before performing any developmental works above them. The most common approach to improving those soils is the chemical treatment using cement and other chemical compounds. The hike in carbon emission (i.e., about 5% of total carbon emissions), climate change, and wildfires with the production of cement and other conventional cementing compounds have increased the necessity of exploring alternative materials. Bio geotechnics is an evolving environmentally friendly technology that employs various microorganisms to stabilize the soil. The following research targets to stabilize such problematic soil with the help of bio cementation technique using a type of fungi called Penicillium Chrysogenum and wood fly ash (a by-product of the Canadian paper and pulp industry). There are mainly two types of bio cementation processes i.e., bacterial, and fungal among which the fungal bio cementation is less explored. Various bench-scale experiments will be conducted to check the possibility of forming a biocomposite material by blending the microbe with fly ash and organic soil. Also, some trial bench scales replicating the field conditions will be performed. The biocomposite material formed is expected to have better uniformity and distribution resulting in higher mechanical behaviour, better compressibility behaviour and applicability to a larger area compared to bacterial bio cementation. Also, the addition of wood fly ash is expected to reduce the cycles of treatment reducing the amount of ammonium released to the environment. Success of the project will lead to application of the technology for the construction of foundations, highways and other structures constructed on problematic organic soils in Canada.

有机土壤是加拿大发现的脆弱的土壤之一，占其总质量的18％。剪切强度和可压缩性和高蠕变行为是这种土壤的某些特征。在这样的土壤上进行的建筑工程导致这些结构的失败。因此，在执行上方的任何发展作品之前，必须对其进行改进。改善这些土壤的最常见方法是使用水泥和其他化合物进行化学处理。随着水泥的产生和其他常规胶结化合物的产生，碳排放量（即占总碳排放量的约5％），气候变化和野火的升高增加了探索替代材料的必要性。 Bio Geotechnics是一种不断发展的环保技术，它采用各种微生物来稳定土壤。以下研究目标是在生物胶结技术的帮助下，使用一种称为青霉基因生成剂和木制粉煤灰的真菌（加拿大纸和纸浆行业的副产品）。主要有两种类型的生物胶结过程，即细菌和真菌，其中真菌生物胶结较少探索。将进行各种台式实验，以检查通过将微生物与粉煤灰和有机土壤混合形成生物复合物质的可能性。同样，将执行一些复制现场条件的试验基准尺度。与细菌生物胶结相比，预期形成的生物复合材料有望具有更好的均匀性和分布，从而产生更高的机械行为，更好的可压缩性行为以及对更大面积的适用性。同样，预计木制粉煤灰的添加将减少治疗周期，以减少释放到环境的铵量。该项目的成功将导致该技术在加拿大有问题的有机土壤上建造的基础，高速公路和其他结构的建设。