氨氮在土工合成黏土衬垫中的扩散行为研究

王宝; 王泽峰; 窦桐桐; 赵亚峰; 葛碧洲

doi:10.11779/CJGE202101016

氨氮在土工合成黏土衬垫中的扩散行为研究 English Version

王宝^{1, 2,},
王泽峰^{3, 2},
窦桐桐¹,
赵亚峰¹,
葛碧洲¹

1.
西安建筑科技大学环境与市政工程学院,陕西　西安　710055
2.
陕西省岩土与地下空间工程重点实验室,陕西　西安　710055
3.
西安建筑科技大学土木工程学院,陕西　西安　710055

基金项目:

国家自然科学基金青年基金项目 41602291

详细信息

作者简介:
王宝(1983— ),男,讲师,主要从事固体废物填埋处置方面的研究工作。E-mail: wangbao@xauat.edu.cn

中图分类号: TU449
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出版历程
- 收稿日期: 2020-05-24
- 网络出版日期: 2022-12-04
- 刊出日期: 2020-12-31

Diffusion of ammonium through a geosynthetic clay liner

1.
School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an710055, China
2.
Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi'an University of Architecture and Technology, Xi'an710055, China
3.
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an710055, China

摘要

摘要: 氨氮是垃圾渗滤液中最具代表性的污染物之一,但其在土工合成黏土衬垫（GCL）中的扩散行为至今尚未得到重视。开展批式吸附试验和扩散试样浸提试验测定氨氮在GCL中的吸附分配系数；进行扩散试验测定氨氮在GCL中的扩散系数；基于试验得到的吸附分配系数和扩散系数,使用数值软件POLLUTE v7.0对氨氮在GCL中的运移行为进行模拟。试验结果表明,氨氮在膨润土上的吸附分配系数为0.017 L/g,在GCL中的扩散系数约为9.0×10^-11 m²/s。POLLUTE v7.0的模拟结果显示,当考虑扩散存在时,氨氮将提前30 a击穿GCL。
- 土工合成黏土衬垫 /
- 氨氮 /
- 扩散 /
- 吸附
Abstract: Ammonium is a typical pollutant encountered in municipal solid waste landfill leachate. However, there have been no researches about the diffusion behavior of ammonium in a geosynthetic clay liner (GCL) until now. A series of batch adsorption tests and diffusion specimen leaching tests are conducted to measure the distribution coefficient of ammonium onto bentonite. In addition, the diffusion tests are conducted to estimate the diffusion coefficient of ammonium in the GCL. Both the adsorption and diffusion coefficients are used in the POLLUTE v7.0 to simulate the mass transfer of ammonium through the GCL. The test results show that the distribution coefficients of ammonium onto bentonite is 0.017 L/g, and the diffusion coefficient through the GCL is 9.0×10^-11 m²/s. The simulated results obtained by the POLLUTE v7.0 show that the ammonium will break through the GCL about 30 years earlier when the diffusion behavior is considered.
- geosynthetic clay liner /
- ammonium /
- diffusion /
- adsorption

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图 1 扩散系数测定仪示意图

Figure 1. Schematic of diffusion test apparatus

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图 2 批式吸附试验结果

Figure 2. Result of batch adsorption tests

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图 3 扩散系数测定仪上下筒中氨氮浓度变化趋势及模拟数值

Figure 3. Observed and predicted change of ammonium with time during diffusion tests

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图 4 垃圾渗滤液运移通过GCL的模型

Figure 4. Mathematical model for landfill leachate transport through GCL

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图 5 GCL底部出流中氨氮浓度随时间变化情况

Figure 5. Calculated concentration in outflow of GCL versus time

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表 1 试验用膨润土的基本性质^[21]

Table 1 Properties and mineralogy of bentonites in geosynthetic clay liner

界限含水率/%		膨胀指数/(mL·2g^-1)	主要矿物质/%					阳离子交互容量/(meq·100g^-1)
液限	塑限	膨胀指数/(mL·2g^-1)	蒙脱石	石英	斜长石	高岭石	钾长石	阳离子交互容量/(meq·100g^-1)
314	40	39	70.56	18.30	5.80	2.94	2.40	91

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表 2 输入到POLLUTE v7.0的参数

Table 2 Input data for modeling ammonium transport through GCL using POLLUTE v7.0

参数	填埋场长度L/m	填埋场宽度W/m	垃圾填埋高度H/m	填埋场中垃圾密度ρ/(kg·m^-3)	单位质量垃圾中氨氮含量ω_b/(g·kg^-1)	渗滤液中氨氮初始浓度c_i/(mg·L^-1)	垃圾渗滤液深度H_Le/m	GCL厚度H_Li/m	GCL中膨润土干密度ρ_d/(g·cm^-3)	GCL中膨润土孔隙率n	GCL渗透系数k/(m·s^-1)	氨氮在GCL中扩散系数D_e/(m²·s^-1)	氨氮在膨润土上分配系数k_d/(L·g^-1)	含水层厚度h_a/m	含水层孔隙率n_a	含水层地下水流速v_a/(m·a^-1)
数值	100	50	20	600	0.35	1500	0.30	0.075	0.79	0.73	5.0×10^-11	9.0×10^-11	0.017	5.0	0.3	5.0

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