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。以3种不同长度的试验箱体开展大肠杆菌在多孔介质里的运移沉积规律,通过试验得出：1）石英石颗粒内部的内摩擦力有利于大肠杆菌的沉积,流动速度对大肠杆菌引起的微生物堵塞起到关键作用：2）3种（60、80、100 cm）不同长度的试验箱体在流速作用下以100和80 cm为对象,其沉积率提高了57.1%;以80和60 cm为对比对象,其沉积率提高了27.3%;3）大肠杆菌的恢复率与流体速度也成正相关作用,其堵塞原理类似沉积率特性。
Abstract
The study focuses on the blockage of Escherichia coli during the recharge process of underground water source heat pumps. The migration and deposition of Escherichia coli in the pores and channels of Porous medium were dynamically observed through the self-developed sand particle migration and deposition test system. In this paper, three test boxes with different lengths were used to carry out the migration and deposition of Escherichia coli in Porous medium. Through the test, the following conclusions were drawn： The internal friction force inside the quartz stone particles is conducive to the deposition of Escherichia coli, and the flow speed plays a key role in the microbial blockage caused by Escherichia coli; Three types of test boxes with different lengths （60, 80, 100 cm） were used as objects under the action of flow velocity, and the sedimentation rate increased by 57.1% for 100 cm and 80 cm; Compared with 80 and 60 cm, the sedimentation rate increased by 27.3%; The recovery rate of Escherichia coli is also positively correlated with fluid velocity, and its principle is similar to sedimentation rate. The experimental research conclusion has on-site guidance significance for microbial blockage in groundwater source heat pump recharge.
关键词
地下水源热泵 /
大肠杆菌 /
多孔介质 /
沉积特性 /
迁移沉积 /
试验系统
Key words
underground water source heat pump /
Escherichia coli /
porous medium /
sedimentary characteristics /
migration sedimentation /
test system
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参考文献
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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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