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Humic acid transport in saturated porous media:Influence of flow velocity and influent concentration 被引量:3

Humic acid transport in saturated porous media:Influence of flow velocity and influent concentration
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摘要 Understanding the transport of humic acids(HAs) in porous media can provide important and practical evidence needed for accurate prediction of organic/inorganic contaminant transport in different environmental media and interfaces. A series of column transport experiments was conducted to evaluate the transport of HA in different porous media at different flow velocities and influent HA concentrations. Low flow velocity and influent concentration were found to favor the adsorption and deposition of HA onto sand grains packed into columns and to give higher equilibrium distribution coefficients and deposition rate coefficients, which resulted in an increased fraction of HA being retained in columns.Consequently, retardation factors were increased and the transport of HA through the columns was delayed. These results suggest that the transport of HA in porous media is primarily controlled by the attachment of HA to the solid matrix. Accordingly, this attachment should be considered in studies of HA behavior in porous media. Understanding the transport of humic acids(HAs) in porous media can provide important and practical evidence needed for accurate prediction of organic/inorganic contaminant transport in different environmental media and interfaces. A series of column transport experiments was conducted to evaluate the transport of HA in different porous media at different flow velocities and influent HA concentrations. Low flow velocity and influent concentration were found to favor the adsorption and deposition of HA onto sand grains packed into columns and to give higher equilibrium distribution coefficients and deposition rate coefficients, which resulted in an increased fraction of HA being retained in columns.Consequently, retardation factors were increased and the transport of HA through the columns was delayed. These results suggest that the transport of HA in porous media is primarily controlled by the attachment of HA to the solid matrix. Accordingly, this attachment should be considered in studies of HA behavior in porous media.
出处 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第12期2554-2561,共8页 环境科学学报(英文版)
基金 supported by the Chinese Academy of Sciences(No.KZCX2-XB3-13-02) the National Natural Science Foundation of China(Nos.41271315,91025018) the Program for New Century Excellent Talents in University(No.NCET-13-0487) the Programs from the Northwest A&F University(No.2014YQ007)
关键词 ATTACHMENT Flow velocity Humic acid Initial concentration Porous media TRANSPORT Attachment Flow velocity Humic acid Initial concentration Porous media Transport
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