Enhanced Nitrogen Removal Performance in Constructed Wetland by Coupling Partial Tide Flow Operation Mode with Iron-Carbon Micro-Electrolysis Process
Yi Ding 1,2
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College of Ocean Science and Engineering, Center for Marine Environmental and Ecological Modelling, Shanghai Maritime University, Shanghai 201306, China
College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China
Submission date: 2022-06-04
Final revision date: 2022-09-19
Acceptance date: 2022-10-02
Online publication date: 2022-12-05
Publication date: 2023-01-12
Corresponding author
Xingpo Liu   

Shanghai Maritime University, 201306, Shanghai, China
Pol. J. Environ. Stud. 2023;32(1):965-972
Constructed wetlands (CWs) with iron-carbon (Fe-C) filler and gravel filler were set up to examine the synthetic effects of partial tide flow operation mode and Fe-C micro-electrolysis on nitrogen removal performance. Submerged emptying ratio (SER) that representing flood and drain period was set to 2:1 and 1:2 respectively for creating aerobic/anoxic alternative conditions. Upper nitrification area of CWs was operated by tide flow mode and the transformation of NH4+-N to NO3--N was greatly enhanced via the extension of emptying time for air dissolution. Fe-C micro-electrolysis could enhance the availability of carbon sources for biological denitrification and facilitated autotrophic denitrification based on iron oxidation and transfer. It made clear that enhanced denitrification in bottom area contributed to NO3--N removal from water body thus facilitating TN removal. Comprehensive and stable COD (84.2±2.0%), NO3--N (82.1±2.0%) and TN (55.6±2.0%) removal efficiencies were simultaneously achieved in partial tide flow CW with Fe-C filler under SER of 1:2. The study provided a novel idea for the efficient nitrogen removal in CWs treating eutrophic water.
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