The study of constructed wetlands has its origin in the study of wetlands generally (Moreno et al., 2007; Gao et al., 2007).
Constructed wetland is a type of sewage treatment process that began to develop in the 1970s (Hattermann et al., 2006; Vymazal et al.,2007).
The constructed wetland treatment system artificially batches sewage with land that is usually in a submerged state and has aquatic plants growing (such as reeds, cattails, etc.),
the sewage along a certain direction of flow is purified under the synergistic effects of water-resistant plants, soil and microorganisms