| 脱硫石膏对碱化土壤胶体絮凝的影响 |
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| 引用本文： | 张文新,张文超,王淑娟,李彦,赵永敢.脱硫石膏对碱化土壤胶体絮凝的影响[J].土壤,2021,53(3):555-562. |
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| 作者姓名： | 张文新 张文超 王淑娟 李彦 赵永敢 |
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| 作者单位： | 清华大学山西清洁能源研究院,清华大学能源与动力工程系,清华大学能源与动力工程系,清华大学能源与动力工程系,清华大学能源与动力工程系 |
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| 基金项目： | 国家重点研发计划课题(2016YFC0501306)；中国博士后科学基金（2019M660682） |
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| 摘 要： | 为明确脱硫石膏改良碱化土壤胶体絮凝过程的离子交换作用,设置了碱化土壤组和碱化土壤胶体组。在不同土水比(1∶5、1∶10、1∶20(m︰V))条件下加入不同量脱硫石膏量(0.1%～2%,m︰m)作为碱化土壤组,以及向利用土水比为1∶100的方法制备碱化土壤胶体中加入不同量的脱硫石膏作为胶体组,以分析脱硫石膏对碱化土壤胶体团聚过程中的临界絮凝值和Na~+与Ca~(2+)摩尔比。结果表明,碱化土壤(pH=9.8;EC=496.1μS/cm)胶体的临界絮凝值为MFGDG=0.008 g,胶体与脱硫石膏的质量比为19.4︰1;碱化土壤临界絮凝值为0.5%,胶体与脱硫石膏的质量比为10.4︰1。在临界絮凝值处,碱化土壤所用脱硫石膏量是土壤胶体的1.8倍,碱化土壤组Na~+与Ca~(2+)摩尔比为2∶1。随着脱硫石膏施用量的增加,胶体组中絮凝层厚度逐渐变薄,pH降低趋势趋于平缓。土水比越小,混合液中pH越大,加入脱硫石膏后,pH明显下降。土水比为1∶20,碱化土壤组上清液Na~+变化逐渐趋于平稳,当加入脱硫石膏后,Ca~(2+)直接吸附在胶体表面发生絮凝现象。研究结果有利于加深脱硫石膏改良碱化土壤中胶体絮凝机理认识,并为确定脱硫石膏改良碱化土壤的适宜施用量提供参考。
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| 关 键 词： | 碱土 脱硫石膏 胶体絮凝 |
| 收稿时间： | 2020/3/10 0:00:00 |
| 修稿时间： | 2020/7/3 0:00:00 |
Effect of Flue Gas Desulphurization Gypsum on Colloidal Flocculation in Sodic Soil |
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| ZHANG Wenxin,ZHANG Wenchao,WANG Shujuan,LI Yan,ZHAO Yonggan.Effect of Flue Gas Desulphurization Gypsum on Colloidal Flocculation in Sodic Soil[J].Soils,2021,53(3):555-562. |
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| Authors: | ZHANG Wenxin ZHANG Wenchao WANG Shujuan LI Yan ZHAO Yonggan |
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| Institution: | Center for ecological restoration of saline?alkali, Shanxi research institute for clean energy, Tsinghua University,Beijing Engineering Research Center for Ecological Restoration and Carbon Fixation of Saline?Alkaline and Desert Land,Department of Energy and Power Engineering,Tsinghua University,Beijing Engineering Research Center for Ecological Restoration and Carbon Fixation of Saline?Alkaline and Desert Land,Department of Energy and Power Engineering,Tsinghua University,Beijing Engineering Research Center for Ecological Restoration and Carbon Fixation of Saline?Alkaline and Desert Land,Department of Energy and Power Engineering,Tsinghua University,Beijing Engineering Research Center for Ecological Restoration and Carbon Fixation of Saline?Alkaline and Desert Land,Department of Energy and Power Engineering,Tsinghua University |
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| Abstract: | |
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| Keywords: | sodic soil desulphurization gypsum colloidal flocculation |
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