Environmental assessment of heavy metal transport and transformation in the Hangzhou Bay, China

Hongwei Fang, Lei Huang, Jingyu Wang, Guojian He, Danny Reible

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

The environmental impact of heavy metal (Cu, Cd, Zn, Pb, Ni, 90Sr and 137Cs) transport and transformation in the Hangzhou Bay (China) was assessed through a comprehensive model that integrates hydrodynamics, sediment and heavy metal transport. A mechanistic surface complexation model was used to estimate the adsorption and desorption of heavy metal by suspended sediment under different aqueous chemistry conditions. The dynamics of metal exchange to and from the seabed was also assessed. The primary processes regulating heavy metal distribution, i.e., convection-diffusion, adsorption-desorption, sedimentation-resuspension, as well as other physical and chemical processes related to mass exchange between adjacent sediment layers, were considered in detail. The accidental discharge of 137Cs was simulated as an example and results showed that 137Cs transported along the coast driven by tidal flow. Most 137Cs distributed near the outfall and accumulated in the seabed sediment. The proposed model can be a useful tool for predicting heavy metal transport and fate and provide a theoretical basis to guide field sampling, assessment of risks and the design of remediation strategies.

Original languageEnglish
Pages (from-to)447-457
Number of pages11
JournalJournal of Hazardous Materials
Volume302
DOIs
StatePublished - Jan 25 2016

Keywords

  • Environmental impact
  • Hangzhou Bay
  • Heavy metal transport
  • Numerical modeling
  • Sediment

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