TY - JOUR
TI - Effect of dry and wet alternation on the transformation of heavy metal forms in bioretention systems
AU - Hao Yong
AU - Chen Lin-Xiao
AU - Liu Yu-Qi
AU - Gao Peng
AU - Jia Pei-Qi
AU - Li Yan-Li
AU - Mei Ying
JN - Thermal Science
PY - 2026
VL - 30
IS - 2
SP - 1273
EP - 1279
PT - Article
AB - Urban stormwater runoff pollution has emerged as a pressing concern, with  heavy metals emerging as a primary contaminant. This poses a significant  threat to the ecological environment and human health. As an effective  management measure, heavy bioretention systems are often subject to  different degrees of wet and dry alternation, resulting in changes in the  accumulation patterns of heavy metals in the system. In this study, a  simulation system was constructed and experimental groups with varying dry  and wet alternation cycles were established. We then proceeded to analyze  the morphological transformations of Cd²⁺ and Pb²⁺ using the continuous  extraction method, thereby unveiling the mechanism behind changes in the  bioefficacy of heavy metals under dry and wet alternation. The results  demonstrated that wet-dry alternation significantly altered the  morphological distribution of heavy metals. Specifically, the exchangeable  states of Cd²⁺ and Pb²⁺ decreased by 3%-7% and 2%-3%, respectively, during  the drought period. However, these metals increased by 1%-4% after  rewatering. The bioavailability of Cd and Pb exhibited an increase in  response to short-term wet-dry alternation, while long-term drought resulted  in a decrease. This study elucidates the regulatory principles that govern  the alterations in the morphology and bioavailability of heavy metals under  conditions of wet and dry alternation. This provides a theoretical basis  for controlling heavy metal pollution in urban storm-water and optimizing  bioretention systems.
DO - 10.2298/TSCI2602273H
ER -