地下水人工回灌过程中多孔介质悬浮物堵塞实验.docx

地下水人工回灌过程中多孔介质悬浮物堵塞实验AbstractGroundwater artificial recharge is a critical process for water resources conservation and management, and the efficiency and effectiveness of the process are largely dependent on the porosity and permeability of the mediums used. In this paper, we report on an experiment to investigate the clogging effect of suspended particles in porous medium during the groundwater artificial recharge process. The experiment involves the simulation of suspended particles in groundwater using kaolin as a model particle to achieve a realistic scenario.The results indicate that the deposition of kaolin particles in the porous medium increases with time and eventually leads to the clogging of the medium. The degree and speed of clogging were found to be dependent on several factors, including the particle size, concentration, and flow rate of the groundwater. The analysis of the experimental data shows that the deposition of particles in medium followed a logarithmic function, and the rate of clogging was higher at higher flow rates and lower particle size.However, the removal of the particle deposition in the medium was found to be possible using a backwash process. The efficiency of the backwash process was found to be limited by factors such as the particle size, concentration, and the duration of the clogging. However, the experimental data showed that the backwash process could effectively remove the deposited particles and restore the permeability of the medium.Overall, this experiment provides insights into the clogging mechanism of porous media during the artificial recharge of groundwater. The results can be applied to optimize the design and operation of groundwater recharge systems to ensure long-term efficiency and sustainability. Keywords: groundwater, artificial recharge, porous media, clogging, kaolin. IntroductionGroundwater artificial recharge is a process that involves the injection of surface water or treated wastewater into aquifers to replenish the depleted groundwater resources. The process has become increasingly popular as a means of enhancing water supply security, particularly in areas where water is scarce or where the available sources are overexploited. The success of groundwater artificial recharge is largely dependent on the porosity and permeability of the mediums used, which can determine the rate of infiltration, the degree of saturation, and the distribution of recharge water within the aquifer. However, the process of artificial recharge can lead to the clogging of the porous medium, which reduces the rate of infiltration and the efficiency of the recharge process over time. The clogging of the porous medium during the artificial recharge of groundwater is caused by the deposition of suspended particles in the aquifer. The deposition of particles can result from several factors, including particle size, concentration, and flow rate. The deposition of particles in porous media reduces the hydraulic conductivity and can ultimately lead to the clogging of the medium, which decreases the recharge efficiency. Therefore, it is essential to understand the clogging mechanism of porous media during the artificial recharge of groundwater to optimize the design and operation of recharge systems and to ensure the long-term sustainability of the process. In this paper, we present an experimental investigation of the clogging process in porous media during the artificial recharge of groundwater. The experiment involved the simulation of groundwater with suspended kaolin particles to achieve a realistic scenario. The objective of the experiment was to determine the degree and rate of clogging of the medium and to investigate the possibility of removal of particle deposition using the backwash process. Materials and MethodsMaterialThe experimental material used in this study was kaolin. Kaolin is a clay mineral commonly used as a model particle for soil and groundwater studies, and it has a wide range of particle sizes between 0.1 and 10 µm. The kaolin particles used in this study were purchased from a commercial supplier with an average particle size of 3.5 µm. Experimental SetupThe experimental setup consisted of a cylindrical column (40 cm diameter, 50 cm height) filled with porous media (sand) with a grain size of 0.2 mm. The column was connected to a water supply system to simulate the flow of groundwater through the porous medium. The water used in the experiment was filtered using a 0.45 µm membrane filter to remove any suspended particles naturally present in the water. The experimental protocol involved the injection of the groundwater through the porous medium at a constant rate while monitoring the deposition of the kaolin particles in the medium. The concentration of kaolin particles was measured before and after the experiment using a UV-vis spectrophotometer. Experimental ProcedureBefore the start 。