Effect of self-drive weak electric strengthening measure on nitrogen removal of a constructed wetland based on ANAMMOX

XU Zhan-yu; TANG Chong; LIU Jun-jie; ZHANG Jian-bo; ZHU Qi-qi; PAN Ling-yang; LI Ding-xin; PING La-mei; LI Gang; WANG Zhen

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China Environmental Science ›› 2025, Vol. 45 ›› Issue (5) : 2490-2502.

Water Pollution Control

Effect of self-drive weak electric strengthening measure on nitrogen removal of a constructed wetland based on ANAMMOX

XU Zhan-yu¹, TANG Chong¹, LIU Jun-jie¹, ZHANG Jian-bo¹, ZHU Qi-qi¹, PAN Ling-yang², LI Ding-xin², PING La-mei¹, LI Gang³, WANG Zhen¹

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Abstract

A self-drive weak electric strengthening constructed wetland (SECW), which was renovated from a hybrid subsurface constructed wetland (HCW) based on ANAMMOX, was established in this study, and its operational performance was thoroughly investigated. Further, the microbial characteristics in the system during the steady operational period were explored, and the nitrogen transformation pathways were also analyzed and elucidated. The results showed that, prefabrication of electroactive biofilms and appropriate layout of the electrodes not only simultaneously enhanced electrode-dependent ammonium oxidation and cathodic denitrification in the SECW, but also significantly increased the abundance and activity of anaerobic ammonium-oxidizing bacteria in its substrate layer. Consequently, a multi-path nitrogen removal system based on ANAMMOX was formed in the device, thereby significantly improving the nitrogen removal performance of the SECW. When the electrode configuration was adopted as “double cathode-single anode” and the hydraulic loading rate (HLR) was 0.08m³/(m²·d), the SECW exhibited optimal performance. Specifically, its COD, TP, TN, and NH₄⁺-N removal rates could reach up to (91.39±3.09)%, (93.64±1.15)%, (91.67±2.77)%, and (94.34±2.72)%, respectively. Additionally, the mean output voltage and power density of the system respectively maintained at (816.45±8.44)mV and 651.96W/m³.

Key words

ANAMMOX / cathodic denitrification / constructed wetland(CW) / electrode-dependent ammoniumoxidation / nitrogen removal / self-drive weak electric strengthening

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XU Zhan-yu, TANG Chong, LIU Jun-jie, ZHANG Jian-bo, ZHU Qi-qi, PAN Ling-yang, LI Ding-xin, PING La-mei, LI Gang, WANG Zhen. Effect of self-drive weak electric strengthening measure on nitrogen removal of a constructed wetland based on ANAMMOX[J]. China Environmental Science. 2025, 45(5): 2490-2502

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