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Water 2017, 9(1), 10; doi:10.3390/w9010010

Influence of Humic Acid on the Transport and Deposition of Colloidal Silica under Different Hydrogeochemical Conditions

1,2
,
1,2,* , 1,2
,
1,2
and
1,2
1
Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China
2
College of Environment and Resources, Jilin University, Changchun 130021, China
*
Author to whom correspondence should be addressed.
Academic Editor: Pieter J. Stuyfzand
Received: 26 October 2016 / Revised: 30 November 2016 / Accepted: 20 December 2016 / Published: 28 December 2016
(This article belongs to the Special Issue Water Quality Considerations for Managed Aquifer Recharge Systems)
View Full-Text   |   Download PDF [2462 KB, uploaded 28 December 2016]   |  

Abstract

The transport and deposition of colloids in aquifers plays an important role in managed aquifer recharge (MAR) schemes. Here, the processes of colloidal silica transport and deposition were studied by displacing groundwater with recharge water. The results showed that significant amounts of colloidal silica transport occurred when native groundwater was displaced by HA solution. Solution contains varying conditions of ionic strength and ion valence. The presence of humic acid could affect the zeta potential and size of the colloidal silica, which led to obvious colloidal silica aggregation in the divalent ion solution. Humic acid increased colloidal silica transport by formation of non-adsorbing aqueous phase silica–HA complexes. The experimental and modeling results showed good agreement, indicating that the essential physics were accurately captured by the model. The deposition rates were less than 10−8 s−1 in deionized water and monovalent ion solution. Moreover, the addition of Ca2+ and increase of IS resulted in the deposition rates increasing by five orders of magnitude to 10−4 s−1. In all experiments, the deposition rates decreased in the presence of humic acid. Overall, the promotion of humic acid in colloidal silica was strongly associated with changes in water quality, indicating that they should receive greater attention during MAR. View Full-Text
Keywords: colloidal silica; humic acid (HA); managed aquifer recharge (MAR); transport and deposition; sand columns colloidal silica; humic acid (HA); managed aquifer recharge (MAR); transport and deposition; sand columns
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhou, J.; Zhang, W.; Liu, D.; Wang, Z.; Li, S. Influence of Humic Acid on the Transport and Deposition of Colloidal Silica under Different Hydrogeochemical Conditions. Water 2017, 9, 10.

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