【摘要】 地下水人工回灌过程中，由悬浮颗粒沉积引起的物理堵塞是造成回灌效率降低的主要原因之一。溶解性有机质广泛存在于回灌水和含水层中，深入研究溶解性有机质对含水层物理堵塞的影响，具有重要的科学意义与应用价值。本文以腐植酸作为代表性溶解性有机质，利用一维渗流模拟试验，系统研究了低浓度腐植酸(1 mg C/L)对悬浮颗粒在含水介质中迁移、沉积行为及含水层物理堵塞的影响效应，并采用扫描电镜、傅里叶红外光谱、X射线光电子能谱及动态光散射等手段揭示腐植酸对含水层物理堵塞的影响机制。研究结果表明，在人工回灌过程中，添加腐植酸可以促进含水介质中悬浮颗粒的迁移，减少含水介质中悬浮颗粒的沉积量，抑制含水层的物理堵塞；当腐植酸吸附至高岭土表面时，增强了高岭土之间的空间位阻效应，进而减少了高岭土之间的团聚，从而增强高岭土的分散稳定性。更多还原

【Abstract】 Suspended soils(SS) are the main factor causing physical clogging during artificial recharge. Dissolved organic matter(DOM) exists widely in recharge water and aquifer. It is of great scientific significance and application value to study the influence of DOM on physical clogging. One-dimensional seepage simulation experiments were used to explore the influence of low concentration(1 mg C/L) humic acid(HA), a representative DOM, on the transport and deposition behavior of SS in porous media, and on the physical clogging during artificial recharge. Scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS), and dynamic light scattering(DLS) were used to reveal the influence mechanism of HA on physical clogging in porous media. The results showed that after adding HA, the transportability of SS was enhanced, the deposition amount of SS was reduced, and the physical clogging in porous media was inhibited. When HA was adsorbed on the surface of kaolinite, the steric hindrance effect between kaolinite was enhanced, and then the agglomeration between kaolinite was reduced, thus enhancing the dispersion stability of kaolinite.更多还原