不同<i>SAR</i>条件下滨海含水层胶体释放与渗透性变异

李海明; 李子琛; 赵雪; 吴锦兰; 马斌

doi:10.3799/dqkx.2012.027

不同SAR条件下滨海含水层胶体释放与渗透性变异

doi: 10.3799/dqkx.2012.027

李海明^{1, 2,},
李子琛^{1, 2},
赵雪^{1, 2},
吴锦兰^{1, 2},
马斌^{1, 2}

1.
天津科技大学滨海地下水利用与保护研究室, 天津 300457
2.
天津市海洋资源与化学重点实验室, 天津 300457

基金项目:

国家自然科学基金项目 40872156

国家自然科学基金项目 40602029

天津市自然科学基金重点项目 11JCZDJC24700

国家水体污染控制与治理科技重大专项 2009ZX07212-003

详细信息

作者简介:
李海明(1971-), 男, 教授, 博士, 主要从事地下水资源利用与污染控制研究.E-mail: lhm99044@163.com

中图分类号: X52
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出版历程
- 收稿日期: 2010-08-12
- 刊出日期: 2012-03-15

Colloid Release Process and Permeability Losses of Coastal Aquifer in Different SAR Conditions

LI Hai-ming^{1, 2
,},
LI Zi-chen^{1, 2},
ZHAO Xue^{1, 2},
WU Jin-lan^{1, 2},
MA Bin^{1, 2}

1.
Laboratory of Coastal Groundwater Utilization & Protection, Tianjin University of Science & Technology, Tianjin 300457, China
2.
Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin 300457, China

摘要

摘要: 在野外调查的基础上, 研究不同钠吸附比(SAR)条件下滨海含水层胶体释放规律, 采集天津平原区代表性含水层土样, 采用室内批实验和土柱实验, 研究胶体释放浓度和释放量的动态特征, 识别不同含水介质胶体释放的差异性, 同时分析胶体颗粒释放过程中含水介质渗透性变异特征.结果表明, 在NaCl和CaCl₂混合溶液系统中, 含水层含水介质胶体颗粒的释放与地下水溶液所含阳离子价态有关, Ca²⁺含量越高, SAR越小, 胶体越不容易释放出来, Ca²⁺对胶体释放的抑制作用越强烈.土柱实验表明不同吸附比情况下粉砂和中砂胶体释放浓度均很小; 当地下水中SAR为0和8时粉土胶体释放很少, 当溶液的SAR为∞时胶体有明显的释放, 释放浓度随孔隙体积数的增加而增加, 在52个孔隙体积数瞬时达到峰值73.76 mg/L, 然后缓慢减少, 最后累积释放量达0.13 mg/g.胶体释放过程中, 粉土、粉砂和中砂渗透性损失分别为98.2%、86.7%和95.9%;含水介质渗透性的降低主要是由于释放的胶体颗粒在空间上重新分布造成的.
- 胶体释放 /
- 钠吸附比 /
- 含水层 /
- 渗透性 /
- 水文地质 /
- 污染控制 /
- 滨海地区
Abstract: On the basis of field investigation, batch experiments and column experiments have been conducted to elucidate dynamics of colloid release concentration and amount from the coastal aquifer under different sodium adsorption ratios (SAR). The differences of colloids release in different aqueous mediums are identified, and the permeability changes of aqueous mediums are investigated in the process of colloid release. The results show that the release capacity of colloidal particles from the aqueous mediums decrease with the increasing of sodium adsorption ratio (SAR) in the mixed solution system of NaCl and CaCl₂, and Ca²⁺ inhibits the release of the colloid. From the column experiment, it is found that a little colloid particles of silty soil are released at the SAR of influent is 0 and 8, and begin to release obviously when the SAR of influent is ∞, and the release amount of colloidal particles from the aqueous mediums increases gradually with the increasing of pore volumes, and reaches the maximum at pore volumes of 52, then the concentration reduces gradually. The total cumulative release amount of colloidal particles from silty soil is 0.13 mg/g. Very little colloid particles of the fine silty and medium sand are released. The permeability loss of silty soil, fine silty and medium sand are 98.2%, 86.7% and 95.9% respectively in the process of colloid release. The permeability losses of aqueous mediums are mainly due to the spatial redistribution of released colloidal particles in the media.
- colloid release /
- sodium adsorption ratio /
- aquifer /
- permeability /
- hydrogeology /
- pollution control /
- coastal regions

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图 1 胶体标准曲线

Fig. 1. Standard curve of colloids

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图 2 实验装置示意

Fig. 2. Sketch of experimental apparatus

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图 3 含水介质胶体释放量与SAR关系曲线

Fig. 3. Correlation curves of colloid release capacity of water-bearing media and sodium adsorption ratio (SAR)

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图 4 不同SAR条件下含水介质胶体释放曲线

Fig. 4. Curves of colloid release water-bearing media in different SAR conditions

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图 5 不同SAR条件下含水介质胶体累积释放量曲线

Fig. 5. Accumulation release capacity of colloid water-bearing media in different SAR conditions

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图 6 不同SAR条件下含水介质渗透系数变化曲线

Fig. 6. Permeability change of the water-bearing media in different SAR conditions

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表 1 含水层含水介质机械组成和主要特征

Table 1. Mechanical composition and major characteristics of water-bearing media of aquifer

含水介质	机械组成(%)					容重(g·cm^-3)	相对密度(g·cm^-3)	孔隙度	CEC(cmol·kg^-1)
含水介质	＞2 mm	2.0~0.5 mm	0.5~0.25 mm	0.25~0.075 mm	< 0.075 mm	容重(g·cm^-3)	相对密度(g·cm^-3)	孔隙度	CEC(cmol·kg^-1)
粉土	0.00	0.00	0.00	10.32	89.68	1.77	2.61	0.32	1.352 8
粉砂	0.00	0.00	2.43	58.01	39.57	1.71	2.76	0.38	0.201 2
中砂	3.40	42.70	16.30	15.10	22.50	1.84	2.90	0.37	0.189 8

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参考文献(14)

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