Efficiencies of Nitrogen Removal in Slope-Constructed Wetlands
Guofen Hua 1  
,   Jinli Li 1,   Ying Cheng 1,   Jun Kong 2,   Xiangdong Liu 1,   Ying Shi 1,   Yuying Huang 1
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College of Water Conservancy and Hydroelectric Power, Hohai University, Nanjing, 210098, P.R. China
College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing, 210098, P.R. China
Guofen Hua   

College of Water Conservancy and Hydroelectric Power, Hohai University, China, China
Submission date: 2020-07-24
Final revision date: 2020-09-16
Acceptance date: 2020-09-26
Online publication date: 2021-02-03
This study proposes a slope-constructed wetland that can be adapted to local conditions in combination with landscape changes along with topography, and the influences of slope and hydraulic load condition changes on nitrogen removal were explored. The main results were as follows. (1) The slope-constructed wetlands showed good feasibility. The removal rate of ammonia nitrogen was approximately 76.60%-77.79%, the removal rate of nitrate nitrogen was 54.46%-56.87%, and the removal rate of total nitrogen was approximately 74.68%-77.16%. (2) Different slopes had their own advantages in removing different forms of nitrogen. The steeper the slope was, the higher the removal of ammonia nitrogen but the lower the removal of nitrate nitrogen. This finding was mainly because with slope changes, the proportion of saturated and unsaturated areas in the slope-constructed wetland changed, and therefore, the ratio in the nitrification zone and denitrification zone subsequently changed; eventually, the removal efficiencies of ammonia nitrogen and nitrate nitrogen were affected.