A Critical Review on Iron-Enhanced Constructed Wetland System: Mechanisms and Application Scope.

Constructed wetland system (CWs), as an effective ecological technology to deal with water pollution, has the advantages of good load adaptability, simple construction process, and low maintenance cost. However, the technology has some bottlenecks such as low operating efficiency and low pollutant removal rate. Iron (Fe) is a non-toxic and non-polluting element widely distributed in the nature and closely related to the removal of pollutants. Applying iron materials in CWs can improve their pollutant removal rate. This paper summarizes the decontamination mechanisms and application status of CWs and introduces the application of iron materials and the mechanisms of iron materials in enhanced CWs. In addition, the application scope of iron-enhanced CWs and its shortcomings are given. The future development direction of iron-enhanced CWs is pointed out to provide new ideas for the subsequent optimization of CWs. [ABSTRACT FROM AUTHOR]