人工回灌过程中富里酸和Cu(Ⅱ)对多孔介质悬浮物堵塞的影响

梁昊志; 王欢; 张俊杰; 刘勇毅; 方运海

doi:10.16030/j.cnki.issn.1000-3665.202301011

人工回灌过程中富里酸和Cu(Ⅱ)对多孔介质悬浮物堵塞的影响

doi: 10.16030/j.cnki.issn.1000-3665.202301011

梁昊志^{1, 2,},
王欢^{1, 2, 3, ,},
张俊杰^{1, 2},
刘勇毅¹,
方运海⁴

1.
桂林理工大学环境科学与工程学院，广西桂林　541004
2.
广西环境污染控制理论与技术重点实验室，广西桂林　541004
3.
桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心，广西桂林　541004
4.
合肥工业大学资源与环境学院，安徽合肥　230009

基金项目: 国家自然科学青年基金项目（42207064）；广西科技基地和人才专项项目（桂科 AD21220079）

详细信息

作者简介:
梁昊志（1998-），男，硕士研究生，主要从事水资源利用与保护研究。E-mail：lianghaozhi1106@163.com

通讯作者:
王欢（1990-），男，讲师，主要从事水资源利用与保护研究。E-mail： wanghuan@glut.edu.cn

中图分类号: P641
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出版历程
- 收稿日期: 2023-01-15
- 修回日期: 2023-03-19
- 网络出版日期: 2023-09-19
- 刊出日期: 2023-09-19

Effect of fulvic acid and Cu(II) on the suspended particles clogging of porous media during artificial recharge

LIANG Haozhi^{1, 2
,},
WANG Huan^{1, 2, 3
, ,},
ZHANG Junjie^{1, 2},
LIU Yongyi¹,
FANG Yunhai⁴

1.
College of Environmental Science and Engineering, Guilin University of Technology, Guilin, Guangxi　541004, China
2.
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin, Guangxi　541004, China
3.
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, Guangxi　541004, China
4.
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui　230009, China

摘要

摘要: 地下水人工回灌是解决地下水超采问题的有效措施，悬浮颗粒物堵塞是影响回灌进行的技术瓶颈。目前多数研究聚焦在悬浮物堵塞方面，然而地表回灌水中重金属离子以及腐殖质对多孔介质物理堵塞的影响缺乏研究。本研究采用室内渗流砂柱试验研究富里酸、Cu(Ⅱ)以及两者共存对多孔介质悬浮物堵塞的影响，分别采用高岭土（SS组）、富里酸+高岭土（SS+FA组）、富里酸+Cu(Ⅱ)+高岭土（SS+FA+Cu组）配置模拟回灌用水。研究结果表明：（1）回灌结束时，SS组、SS+FA组、SS+FA+Cu组多孔介质整体相对渗透系数K’分别降至0.233，0.095，0.182。SS组和SS+FA+Cu组在中上层（0~7.50 cm）相对渗透系数K’均降至0.28以下，而在底层（7.50~10.50 cm）相对渗透系数K’仅降至0.45左右，说明2组多孔介质中上层重度堵塞（0<K’<0.30）、底层中度堵塞（0.30<K’<0.60）；SS+FA组在各渗流段（0~10.50 cm）相对渗透系数K’均降至0.18以下，说明SS+FA组各渗流段多孔介质均为重度堵塞，相对其它2组，SS+FA组中悬浮物更易向深层迁移。（2）富里酸、Cu(Ⅱ)的存在会改变悬浮颗粒粒径、荷电性及内部氢键作用，从而影响多孔介质的堵塞发生。（3）相对SS组，SS+FA组富里酸的存在会加剧多孔介质堵塞；SS+FA+Cu组多孔介质整体堵塞程度比SS+FA组小，说明Cu(Ⅱ)会缓解富里酸对堵塞的加剧作用。探明富里酸和Cu(Ⅱ)对多孔介质堵塞的影响机制，能够为人工回灌过程中多孔介质堵塞的防治提供理论基础和科学依据。
- 多孔介质 /
- 堵塞 /
- 悬浮物 /
- 富里酸 /
- Cu(Ⅱ) /
- 地下水起采 /
- 地面沉降
Abstract: Artificial recharge is an effective technology to solve the problem of groundwater over-exploitation. Clogging of porous media is the bottleneck affecting groundwater recharge. Most studies have focused on the clogging of suspended particles. Few studies focus on the effects of heavy metal ions and humus in recharge water on the physical clogging. This study conducts sand column experiment to explore the influence of fulvic acid, Cu(II) and their coexistence on the suspended particles clogging of porous media. Kaolin (SS group), fulvic acid + kaolin (SS+FA group), fulvic acid + Cu(II) + kaolin (SS+FA+Cu group) are added to recharge water, respectively. The results show that (1) the relative hydraulic conductivity (K’) of SS group, SS+FA group and SS+FA+Cu group decrease to 0.233, 0.095 and 0.182, respectively. The K’ of SS group and SS+FA+Cu group in 0−7.50 cm decrease to below 0.28, while the K’ in the bottom layer (7.50−10.50 cm) decrease to about 0.45, which indicates that 0−7.50 cm of the porous media in SS group and SS+FA+Cu group are severely clogged (0<K’<0.30) and the bottom layer is moderately clogged (0.30<K’<0.60). TheK' of the porous media in SS+FA group among different layers (0−10.50 cm) decrease to below 0.18, which shows that the porous media of SS+FA group in different layers are severely clogged. Compared with the other two experimental groups, the suspended particles in SS+FA group are more likely to migrate into the deeper layer in the sand column. (2) Fulvic acid and Cu(II) can change the particle size, charge and internal hydrogen bonding of the suspended particles, thus affect the clogging process. (3) Compared with SS group, fulvic acid aggravates the clogging of the porous media. The clogging degree of the porous media in SS+FA+Cu group is slighter than that in SS+FA group, which indicates that Cu(II) would alleviate the aggravating effect of fulvic acid on clogging. Exploring the influence mechanism of fulvic acid and Cu(Ⅱ) on porous media clogging can provide a theoretical and scientific basis for the prevention and treatment of porous media clogging in the process of artificial recharge.
- porous media /
- clogging /
- suspended particles /
- fulvic acid /
- Cu(II) /
- groundwater over-exploitation /
- land subsidence

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图 1 试验装置示意图

Figure 1. Schematic diagram of experimental setup

下载: 全尺寸图片幻灯片

图 2 傅里叶变换红外光谱图

Figure 2. Fourier transform infrared spectrum

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图 3 多孔介质整体相对渗透系数随时间变化

Figure 3. Changes of relative hydraulic conductivity for the entire sand column with time

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图 4 不同试验组砂柱各渗流段相对渗透系数随时间变化

注：AB段表示0～1.50 cm；BC段表示1.50～4.50 cm；CD段表示4.50～7.50 cm；DE段表示7.50～10.50 cm。

Figure 4. Changes in relative hydraulic conductivity of each seepage section of the sand columns in different test groups with time

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图 5 不同渗流段石英砂介质中悬浮颗粒沉积量

Figure 5. Deposition of suspended particles in the sand column of different seepage layers

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图 6 悬浮颗粒粒径和静电斥力对迁移能力的影响

Figure 6. Influence of particle size and electrostatic repulsion of suspended particles on migration ability

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图 7 悬浮物堵塞类型及微观机制示意图

Figure 7. Schematic diagrams showing the mechanism of suspended solids clogging and main clogging types

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表 1 渗流试验主要组别及参数设计

Table 1. Parameters of different experimental groups

试验组别	模拟回灌用水	高岭土浊度 /NTU	富里酸质量浓度 /（mg·L⁻¹）	Cu（Ⅱ）质量浓度 /（mg·L⁻¹）
CK组	纯水	−	−	−
FA组	富里酸	−	5.00	−
SS组	高岭土	100	−	−
SS+FA组	高岭土+富里酸	100	5.00	−
SS+FA+ Cu组	高岭土+富里酸+ Cu（Ⅱ）	100	5.00	1.00

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表 2 不同组别悬浮物Zeta电位及粒径

Table 2. Zeta potential and particle size of suspended solids in different experimental groups

试验组别	悬浮颗粒	悬浮颗粒共存物质	Zeta电位/mV	中位粒径/μm
SS组	高岭土	无	−5.64	2.47
SS+FA组	高岭土	富里酸	−8.56	2.05
SS+FA+Cu组	高岭土	富里酸+Cu（Ⅱ）	−7.22	2.37

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