Impact of biological clogging on the barrier performance of landfill liners
Impact of biological clogging on the barrier performance of landfill liners
复制标题
生物堵塞对垃圾填埋场衬垫阻隔性能的影响
DOI：
10.1016/j.jenvman.2018.05.039
复制
发表时间：
2018
影响因子：
8.7
通讯作者：
Mo Jialin
中科院分区：
文献类型：
--
作者：
Tang Qiang（唐强）;Gu Fan;Zhang Yu;Zhang Yuqing;Mo Jialin
填埋场的耐久性主要取决于衬垫系统的防渗性能。微生物生物量的积累对降低土壤导水率是有效的。本研究旨在评估微生物对填埋场衬垫屏障性能的影响。根据结果，大肠杆菌。产生大量的胞外聚合物并聚结形成汇合堵塞生物膜。这种微生物最终导致土壤渗透性降低81%-95%。同时，内孔内表面粗糙度的增加提高了微生物定植与颗粒表面的粘附性。随后，进行了广泛的参数敏感性分析，以评估垃圾填埋场衬垫中的污染物传输。将渗透系数从1 × 10− 8 m/s降低到1 × 10− 10 m/s，穿透时间增加了345.2%。这表明，低的水力传导率对于衬里系统实现期望的屏障性能是必不可少的。
The durability of landfill mainly relies on the anti-seepage characteristic of liner system. The accumulation of microbial biomass is effective in reducing the hydraulic conductivity of soils. This study aimed at evaluating the impact of the microorganism on the barrier performance of landfill liners. According to the results,Escherichia coli. produced huge amounts of extracellular polymeric substances and coalesced to form a confluent plugging biofilm. This microorganism eventually resulted in the decrease of soil permeability by 81%–95%. Meanwhile, the increase of surface roughness inside the internal pores improved the adhesion between microorganism colonization and particle surface. Subsequently, an extensive parametric sensitivity analysis was undertaken for evaluating the contaminant transport in landfill liners. Decreasing the hydraulic conductivity from 1 × 10−8m/s to 1 × 10−10m/s resulted in the increase of the breakthrough time by 345.2%. This indicates that a low hydraulic conductivity was essential for the liner systems to achieve desirable barrier performance.