| 生物炭颗粒在饱和多孔介质中的迁移与滞留 |
| |
| 引用本文： | 杨雯,郝丹丹,徐东昊,商建英,李保国.生物炭颗粒在饱和多孔介质中的迁移与滞留[J].土壤通报,2017(2):304-312. |
| |
| 作者姓名： | 杨雯 郝丹丹 徐东昊 商建英 李保国 |
| |
| 作者单位： | 中国农业大学资源与环境学院,北京,100193 |
| |
| 基金项目： | 中国农业大学优秀人才项目(2015RC002)，国家自然科学基金项目(41501232)，2016教育部本科教学工程国家级大学生创新项目(15101001) |
| |
| 摘 要： | 生物炭在实际生产实践中具有许多潜在的农业和环境效益,因此受到了越来越多的关注。生物炭在多孔介质中的迁移不仅会影响它在土壤中的归趋,还可能会影响微生物群体及土壤有机质的动态变化以及被吸附的污染物对环境的影响。实验通过柱实验研究了微米级生物炭颗粒在饱和多孔介质中的迁移和滞留特性,主要选取了四种影响生物炭迁移的潜在因素:原材料、裂解温度、背景溶液pH值和离子强度。实验结果显示微米级生物炭在饱和多孔介质中具有一定的迁移能力,但是大部分的微米级生物炭会滞留在饱和多孔介质的表面和孔隙间。生物炭的制备原材料对于生物炭的表面电势特性有较大影响,从而影响了微米级生物炭在饱和多孔介质中的迁移能力。热解温度越高,生物炭的表面电势越大,迁移能力越弱。随着背景溶液离子强度增加和pH值减小,微米级生物炭颗粒在多孔介质中滞留增加,迁移能力减弱。
|
| 关 键 词： | 生物炭 多孔介质 迁移 DLVO理论 |
Transport and Retention of Biochar Particles in Saturated Porous Media |
| |
| YANG Wen,HAO Dan-dan,XU Dong-hao,SHANG Jian-ying,LI Bao-guo.Transport and Retention of Biochar Particles in Saturated Porous Media[J].Chinese Journal of Soil Science,2017(2):304-312. |
| |
| Authors: | YANG Wen HAO Dan-dan XU Dong-hao SHANG Jian-ying LI Bao-guo |
| |
| Abstract: | Application of biochars has been attracting more and more attention for potential agronomic and environmental benefits.The mobility of biochar influences its fate in soils,the dynamic changes of microbial groups and soil organic matter,and soil quality due to its strong sorption ability for pollutants in environment.In this study,column experiments were conducted to investigate the transport and retention of biochar particle in saturated porous media.The potential influencing factors were studied,including biochar feedstock (wheat straw and corn straw),pyrolysis temperature (450 ℃ and 600 ℃),and the conditions of background solution such as ionic strength (IS,1 mM and 0.1 mM) and pH (5 and 7).Most of biochar particles were retained in saturated porous media,but around 10％ -20％ biochars can move out of the columns packed with glass beads.The feedstock and pyrolysis temperature had great influence on the surface charge on biochar particles,and affected the mobility of biochar particles in saturated porous media.The transport ability of biochar particles decreased with increasing IS or decreasing pH of background solution. |
| |
| Keywords: | Biochar Porous media Transport DLVO theory |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
