Because of the advantages of low cost

low energy consumption

high treatment efficiency

simplicity of operation and maintenance etc.

wetland ecosystem is globally used in wastewater treatment (especially in rural areas and small cities). On the basis of existing results of removal mechanism of heavy metal in wetland ecosystem

A few key issues in the use of wetland ecosystem in wastewater treatment and the potential trend of the study have been comprehensively discussed and reviewed

which is of great significance to the future studies.