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| Impacts of high pH on transport of colloid in saturated porous media |
| YUAN Rui-qiang1, GUO Wei1,2, WANG Peng3, WANG Shi-qin4 |
1. School of Environment and Resource, Shanxi University, Taiyuan 030006, China;
2. Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China;
3. Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, China;
4. key Laboratory of Agricultural Water Resources Research, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050021, China |
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Abstract The adsorption behaviors of colloid transported in untreated glass bead and acid-washed glass bead were compared to examine influences of high pH conditions. Results showed that adsorption of colloid reduced by increasing pH value due to detachment of colloid from the primary minimum under unfavorable conditions. Chemical impurities promoted attachment of colloid to primary minimum. However, a part of colloids attached by chemical impurities was released as pH value increased. Furthermore, the influence of chemical impurities on adsorption of colloid can be ignored when the pH value of solution exceeded 10. The amount of colloid adsorbed depends on not only the adsorption and desorption processes but also the final environment of solution, especially the high pH conditions. The limitation of the traditional DLVO theory was verified. The understanding about the role of high pH conditions during the process of colloid transport was improved.
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Received: 26 January 2017
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