Nitrogen removal from summer to winter in a field pilot-scale multistage constructed wetland-pond system

A pilot-scale multistage constructed wetland-pond（MCWP） system with a "pre-ecological oxidation pond, two-stage horizontal subsurface flow constructed wetland（HSCW） and surface flow constructed wetland（SFCW） as the core and postsubmerged plant pond" as the process was used to treat actual polluted river water in the field, and the variation in nitrogen removal from summer to winter was investigated. The results showed that the average total nitrogen（TN） removal efficiency in the MCWP was approxi...