Advances in removal efficiency of nitrogen and phosphorus in constructed wetland ecosystem

In this paper, constructed wetland and its removal mechanisms of nitrogen and phosphorus in wastewater treatment were introduced. Recent research status of removal efficiency improvement of nitrogen and phosphorus were systematically expatiated on via wetland plants, substrates and microorganisms. Some proposals about the ways to improve the removal efficiency of nitrogen and phosphorus were given, such as meliorating the design of constructed wetland system, practicing bioaugmentation by the dominant species and optimal condition, appending subordinates in the substrate, and enhancing biodiversity in the bed of constructed wetland.