The impact of recycling polyaluminium chloride and anionic polyacrylamide water treatment residuals on heavy metal adsorption in soils: implications for stormwater bioretention systems

Jing Chen; Runbin Duan; Bingzi Zhu; Yao Sun; Jiangqi Gao

doi:10.2166/wst.2024.078

Water Science and Technology (Mar 2024)

The impact of recycling polyaluminium chloride and anionic polyacrylamide water treatment residuals on heavy metal adsorption in soils: implications for stormwater bioretention systems

Jing Chen,
Runbin Duan,
Bingzi Zhu,
Yao Sun,
Jiangqi Gao

Affiliations

Jing Chen: Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China
Runbin Duan: Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China
Bingzi Zhu: Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China
Yao Sun: Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China
Jiangqi Gao: Department of Environmental Engineering, College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi Province 030024, China

DOI: https://doi.org/10.2166/wst.2024.078
Journal volume & issue: Vol. 89, no. 6
pp. 1570 – 1582

Abstract

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Despite the high adsorption capacity of polyaluminum chloride and anionic polyacrylamide water treatment residuals (PAC-APAM WTRs) for Pb2+, Cd2+, Cu2+, and Zn2+, their influence on the adsorption behavior of heavy metals in traditional bioretention soil media remains unclear. This study investigated the impact of PAC-APAM WTRs at a 20% weight ratio on the adsorption removal of Pb2+, Cd2+, Cu2+, and Zn2+ in three types of soils. The results demonstrated improved heavy metal adsorption in the presence of PAC-APAM WTRs, with enhanced removal observed at higher pH levels and temperatures. The addition of PAC-APAM WTRs augmented the maximum adsorption capacity for Pb2+ (from 0.98 to 3.98%), Cd2+ (from 0.52 to 10.99%), Cu2+ (from 3.69 to 36.79%), and Zn2+ (from 2.63 to 13.46%). The Langmuir model better described the data in soils with and without PAC-APAM WTRs. The pseudo-second-order model more accurately described the adsorption process, revealing an irreversible chemical process, although qe demonstrated improvement with the addition of PAC-APAM WTRs. This study affirms the potential of PAC-APAM WTRs as an amendment for mitigating heavy metal pollution in stormwater bioretention systems. Further exploration of the engineering application of PAC-APAM WTRs, particularly in field conditions for the removal of dissolved heavy metals, is recommended. HIGHLIGHTS The impacts of polyaluminum chloride and anionic polyacrylamide water treatment residuals (PAC-APAM WTRs) on heavy metal adsorption in soils were investigated.; The addition of PAC-APAM WTRs enhanced heavy metal removal in soils.; PAC-APAM WTRs showed no alterations in the monolayer adsorption process.; PAC-APAM WTRs enhanced the maximum adsorption capacity of heavy metals in soils.; PAC-APAM WTRs did not alter the kinetic behavior of heavy metals.;

Published in Water Science and Technology

ISSN: 0273-1223 (Print); 1996-9732 (Online)
Publisher: IWA Publishing
Country of publisher: United Kingdom
LCC subjects: Technology: Environmental technology. Sanitary engineering
Website: https://iwaponline.com/wst

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