首页|PRB颗粒填料对Cd2+的吸附特征及其孔隙结构动态演变规律

PRB颗粒填料对Cd2+的吸附特征及其孔隙结构动态演变规律

扫码查看
原文链接
  • 万方数据
  • 维普
以PRB复合颗粒填料(CGF)开展动态吸附试验，探究其对Cd2+的动态吸附规律与主要影响因素;借助可视化手段与孔隙网络模型(PNM)，探究吸附前后CGF的几何特征与孔隙结构演变规律，明确填料消蚀与孔隙堵塞的动态平衡关系。研究结果表明:当泵速为10 r/min、质量浓度为50 mg/L时CGF的平衡吸附量最大，达到了1。81 mg/g;泵速对穿透曲线的影响最大，且低流量更有利于CGF对Cd2+的吸附。吸附后孔隙率提高了7。79%，分形维数最多下降了7。95%，孔隙堵塞对分形维数影响较大;CGF溶蚀降低了表面积与平均等效直径，但球度在1。4～1。6范围的颗粒占比提高到75。9%。吸附后平均配位数由10。43降低至8。65，降低了17。07%;同时参与配位的"棍体"与"球体"数量分别降低了43。28%与31。63%。CGF消蚀导致动态柱中部发生堵塞，降低了孔隙与喉道的连接，但并未出现"实质性"堵塞，PNM仍保持良好的连通性能。
Adsorption characteristics of Cd2+and pore structure dynamic evolution of PRB granular fillers
The dynamic adsorption experiment was carried out with PRB composite granular filler(CGF)to investigate the dynamic adsorption laws of Cd2+and the main influencing factors.The geometric characteristics of CGF and pore structure evolution were explored with the help of visualization and pore network model(PNM),and the dynamic balance relationship between filler erosion and pore blockage was clarified.The results show that the equilibrium adsorption is the maximum at a pump speed of 10 r/min and a mass concentration of 50 mg/L,which reaches 1.81 mg/g.The pump speed has the most influence on the breakthrough curve,and low volume of flow is more favorable for Cd2+adsorption.The porosity increases by 7.79%,the fractal dimension decreases by up to 7.95%after adsorption,and the pore blockage has a significant impact on the fractal dimension.CGF erosion reduces the surface area and average equivalent diameter.However,the proportion of particle with sphericity in the range of 1.4 to 1.6 increases to 75.9%.The average coordination number decreases from 10.43 to 8.65 after adsorption,with a decrease of 17.07%.Meanwhile,the numbers of"sticks"and"spheres"involved in coordination decrease by 43.28%and 31.63%,respectively.The CGF erosion leads to pores blockage in the middle of the columns and reduces the connection between pores and throats.However,the pores are not"substantially"clogged,and the PNM still maintains satisfactory connectivity.

permeable reactive barrier(PRB)dynamic adsorptionfiller erosionpore pluggingmaximal ball algorithm

江杰、王树飞、罗豪豪、苏建、曹斐姝、廖长君、陈俊霖

展开 >

广西大学土木建筑工程学院,广西南宁,530004

广西博世科环保科技股份有限公司,广西南宁,530001

自然资源部南方石山地区矿山地质环境修复工程技术创新中心,广西南宁,530028

可渗透反应墙(PRB) 动态吸附 填料消蚀 孔隙堵塞 最大球算法

国家重点研发计划项目南宁市重点研发计划项目广西研究生教育创新计划项目National Key Research and Development Program of ChinaKey Research and Development Program of Nanning CityInnovation Project of Guangxi Graduate Education

2019YFC180350020223040YCBZ2022008

2024

10.11817/j.issn.1672-7207.2024.07.006

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(7)