以地下水源热泵回灌过程中大肠杆菌堵塞作为研究对象,通过自主研发的砂层颗粒迁移-沉积试验系统观察大肠杆菌在多孔介质孔隙孔道内的运移、沉积。分别以石英石、玻璃珠作为多孔介质做对比性试验,通过试验得出：石英石颗粒不均匀,级配不良,颗粒间的咬合力为大肠杆菌的沉积提供了“温床”,进而孔隙水压力呈现先增大后减小再稳定的状态;但玻璃珠颗粒粒径均匀,同时颗粒之间光滑,咬合力小,不利于大肠杆菌的沉积,孔隙水压力呈现陡减的现象。建立大肠杆菌渗透率衰减数学模型,将理论值和室内试验值进行数据拟合,从验证的结果看,所提渗透率衰减模型对预见微生物的迁移和沉积所引起的孔隙率减小是有效的。
Abstract
The study focuses on the blockage of Escherichia coli in the recharge process of groundwater source heat pumps. Observing the migration and deposition of Escherichia coli in porous media pores through a self-developed sand layer particle migration sedimentation test system; Comparative experiments were conducted using quartz and glass beads as porous media. The results show that the quartz particles are uneven, poorly graded, and the biting force between particles provides a "warm bed" for the deposition of Escherichia coli. As a result, the pore water pressure showes a state of first increasing, then decreasing, and finally stabilizing. However, the glass bead particles have a uniform particle size, and the particles are smooth and have low biting force, which is not conducive to the deposition of Escherichia coli, resulting in a sharp decrease in pore water pressure. Establish a mathematical model for the attenuation of Escherichia coli permeability, fit theoretical values with indoor experimental values, and verify that the proposed permeability attenuation model is effective in predicting the porosity decrease caused by microbial migration and deposition.
关键词
水源热泵 /
大肠杆菌 /
堵塞 /
回灌系统 /
绿色节能
Key words
water source heat pump /
Escherichia coli /
blockage /
recharge system /
green and energy-saving
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基金
国家自然科学基金（51204168）; 深部煤矿采动响应与灾害防控国家重点实验室项目（SKLMRDPC23KF13）
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