Enhanced Nitrogen Removal of Eutrophic Water in Constructed Wetland by Novel Integration of Submerged Macrophyte Pond
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
Xinshan Song   

Donghua University, 201620, Shanghai, China
Submission date: 2021-07-20
Final revision date: 2021-10-24
Acceptance date: 2021-10-31
Online publication date: 2022-02-14
Publication date: 2022-04-06
Pol. J. Environ. Stud. 2022;31(3):2485–2491
Nitrogen pollution exacerbated water eutrophication and thus caused the rapid growth of algae. Constructed wetland (CW) could be blocked by excessive algae when removing nitrogen from eutrophic water. Submerged macrophytes were proved to be effective in decreasing algae survival and purifying nitrogen compounds. Therefore, submerged macrophyte pond (SMP) was integrated with CW to enhance nitrogen removal through intensifying nitrification and denitrification simultaneously. In hybrid system, algae-macrophyte photosynthesis in SMP improved oxygen environment of subsequent CW, thus facilitating nitrification process of CW. Residual algae debris from SMP effluents could be utilized as biodegradable carbon sources for subsequent CW, thus promoting denitrification process of CW. Nitrogen removal performance in hybrid system was significantly higher than that in single SMP and CW reactor due to carbon and oxygen enhancement, and the highest NH4-N and TN removals reached 62.1±2.0% and 60.4±2.0%. The layer effect on nitrogen removal had been identified in CW unit, and optimal reductions of NH4-N and TN were obtained in the upper and bottom layer respectively. The study suggested that the hybrid system could be a cost-effective solution for reducing nitrogen and algae loads of eutrophic water.