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Transport Behavior of Cu2+ Under Binary and Multi-Component Systems in the Columns of Polyaluminium Chloride and Anionic Polyacrylamide Water Treatment Residuals: Implication for Reuse in Stormwater Bioretention Systems

The lack of information from column studies of Cu 2+ transport in polyaluminium chloride and anionic polyacrylamide water treatment residuals (PAC-APAM WTRs) has been hampering their reuse as a media in stormwater bioretention systems. The transport behavior of inactive tracer Br − and Cu 2+ in vari...

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Published in:Water, air, and soil pollution air, and soil pollution, 2022-07, Vol.233 (7), Article 253
Main Authors: Duan, Runbin, Chen, Jing
Format: Article
Language:English
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Summary:The lack of information from column studies of Cu 2+ transport in polyaluminium chloride and anionic polyacrylamide water treatment residuals (PAC-APAM WTRs) has been hampering their reuse as a media in stormwater bioretention systems. The transport behavior of inactive tracer Br − and Cu 2+ in various systems with and without the presence of Pb 2+ , Cd 2+ , and Zn 2+ was investigated in the columns of PAC-APAM WTRs under saturated steady flow conditions. Modeling Br − breakthrough curves (BTCs) using CXTFIT revealed that the transport of a solute in the columns was an equilibrium process almost without stagnant water, with all active sites on PAC-APAM WTRs being instantaneously available for the adsorption reaction during transport ( β p  = 0.99 and ω L  = 100). The results of modeling Cu 2+ BTCs with HYDRUS-1D showed that the chemical non-equilibrium two-site model ( R 2 0.8911–0.9999; RMSE 0.00–0.05) described the experimental data of Cu 2+ better than the equilibrium convection–dispersion model using the linear isotherm ( R 2 0.4877–0.9901; RMSE 0.02–0.12) and the Langmuir isotherm ( R 2 0.7083–0.9938; RMSE 0.01–0.10). The fraction of instantaneous adsorption sites at the equilibrium ( f e ) of Cu 2+ decreased with the increase of co-existing heavy metal ions from 0.27 (monocomponent system) to 0.06 (quaternary system) due to competitive adsorption with the Cu 2+ , Cd 2+ , and Zn 2+ systems as an exception. The first kinetic rate ( ω ) of Cu 2+ increased with the increase of competitive heavy metal ions from 0.0076 (monocomponent system) to 0.0410 (quaternary system). This research could contribute to the understanding of Cu 2+ transport and potential leaching in stormwater bioretention systems.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-022-05739-x