改性塿土对土壤有机污染物苯酚运移的阻滞模拟
为了防止和控制污染物在土壤中纵向迁移,保护地下水免受污染。该研究通过饱水土柱运移试验,用非反应性离子Cl-探求土柱参数弥散系数,并运用平均孔隙水流速和弥散系数求算反应性溶质苯酚的运移参数阻滞系数,探究十六烷基三甲基溴化铵(cetyltrimethylammonium bromide,CTMAB)改性土和原土对苯酚运移的阻滞效应,以及改性比例、pH值、离子强度等因素对苯酚在土柱中运移的影响。结果表明:以 CTMAB 改性黏化层塿土,显著增强了土壤对苯酚运移的阻滞能力。改性土对苯酚运移的阻滞能力随着改性比例的增加而增强,苯酚在100%改性土中运移的阻滞系数值是在原土中的26.06倍;pH值在6.0...
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Published in | 农业工程学报 Vol. 31; no. 11; pp. 249 - 255 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
西北农林科技大学理学院,杨凌,712100%西北农林科技大学资源环境学院,杨凌 712100
2015
农业部西北植物营养与农业环境重点实验室,杨凌 712100%西北农林科技大学资源环境学院,杨凌,712100 |
Subjects | |
Online Access | Get full text |
ISSN | 1002-6819 |
DOI | 10.11975/j.issn.1002-6819.2015.11.036 |
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Summary: | 为了防止和控制污染物在土壤中纵向迁移,保护地下水免受污染。该研究通过饱水土柱运移试验,用非反应性离子Cl-探求土柱参数弥散系数,并运用平均孔隙水流速和弥散系数求算反应性溶质苯酚的运移参数阻滞系数,探究十六烷基三甲基溴化铵(cetyltrimethylammonium bromide,CTMAB)改性土和原土对苯酚运移的阻滞效应,以及改性比例、pH值、离子强度等因素对苯酚在土柱中运移的影响。结果表明:以 CTMAB 改性黏化层塿土,显著增强了土壤对苯酚运移的阻滞能力。改性土对苯酚运移的阻滞能力随着改性比例的增加而增强,苯酚在100%改性土中运移的阻滞系数值是在原土中的26.06倍;pH值在6.0~8.0变化时,对苯酚在改性土中运移的阻滞作用影响不大;当离子强度在0.001~0.1 mol/L范围内,随着离子强度的增加,原土和改性土对苯酚运移的阻滞能力均减弱,原土对苯酚的阻滞系数由0.56降至0.37,100%改性土由17.57降至8.71。以100%改性比例制备的改性土在中性环境,离子强度为0.001 mol/L环境中对苯酚的阻滞效果最好。 |
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Bibliography: | Di Xin, Meng Zhaofu, Yang Shuying, Cui Xiaobo, Xiang Wei, Ren Wenli, Yang Yali, Li Wenbin, Wu Qiong (1. College of Science, Northwest A &F University, Yangling 712100, China; 2. College of Resource and Environment, Northwest .4 &F University, Yangling 712100, China; 3. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China) 11-2047/S In order to prevent and control longitudinal migration of pollutants in soil and protect the groundwater from pollution, saturated soil column transport experiments were conducted,and the software CXTFIT2.1 was used for fitting the parameters from the experiments. This study aimed to explore retarding effect of the cetyltrimethylammonium bromide (CTMAB) modified soil and raw soil on migration of phenol, and to investigate the effect of modification ratio, pH, ionic strength on phenol migration in soil column. The results showed that with the software CXTFIT2.1, the deterministic equilibrium CDE (EM) model can b |
ISSN: | 1002-6819 |
DOI: | 10.11975/j.issn.1002-6819.2015.11.036 |