NITROGEN REMOVAL PERFORMANCE OF COMPOSITE VERTICAL FLOW CONSTRUCTED WETLAND AT DIFFERENT DEPTHS

HUANG Qiujin; XIAO Ying; WANG Yafen; WU Zhenbin; ZHOU Qiaohong

doi:10.13205/j.hjgc.202301020

Volume 41 Issue 1

Jan. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(1): 164-172

HUANG Qiujin, XIAO Ying, WANG Yafen, WU Zhenbin, ZHOU Qiaohong. NITROGEN REMOVAL PERFORMANCE OF COMPOSITE VERTICAL FLOW CONSTRUCTED WETLAND AT DIFFERENT DEPTHS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(1): 164-172. doi: 10.13205/j.hjgc.202301020

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HUANG Qiujin, XIAO Ying, WANG Yafen, WU Zhenbin, ZHOU Qiaohong. NITROGEN REMOVAL PERFORMANCE OF COMPOSITE VERTICAL FLOW CONSTRUCTED WETLAND AT DIFFERENT DEPTHS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(1): 164-172. doi: 10.13205/j.hjgc.202301020

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NITROGEN REMOVAL PERFORMANCE OF COMPOSITE VERTICAL FLOW CONSTRUCTED WETLAND AT DIFFERENT DEPTHS

doi: 10.13205/j.hjgc.202301020

1. School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan 430074, China;
2. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China

Received Date: 2022-04-15
Available Online: 2023-03-23

Abstract

Abstract

In this project, four sectional IVCW column pilot systems with the column depth of 145 cm and 185cm were built for wastewater with a low C/N ratio, to examine the effects of substrate height, the addition of active biomass and nitrogen composition in influent on nitrogen removal efficiency of the system. Results showed when the hydraulic retention time was 1 d, the total nitrogen (TN) removal rate of the four systems was all above 30%, and when the half-way substrate layer was set at 95 cm, the HI group without active biomass added had the highest TN removal rate of 42%; the average removal rates of NH₃-N and NO₃-N ranged from 20% to 48% and 21% to 66% respectively, while NO₂-N was found accumulated in different degrees in each system. With the increase of the proportion of NO3-N in the influent (from 1/7 to 6/7), the removal rate of NO₃-N in the influent decreased as a whole, and the removal rate of HI group was more stable than that of the other groups. However, after the depth of the IVCW system was increased, adding active biomass will reduce its TN removal effect. The first stage of the IVCW system, i.e. the upper downflow unit, contributed the most to nitrogen removal, up to 80%; although the effect of enhanced nitrogen removal was not significant among different treatments, there were certain differences in the nitrogen removal pathway in the later stages of the system. Accordingly, the abundance and type of microbial fatty acids were the highest in the first segment, and their fatty acid composition was the most obvious difference from other segments; the anaerobic bacteria marked by cy19:0 gradually occupied the dominant position in the 3 to 4 segments of the upstream flow, and the deepened group was higher than the control; the aerobic bacteria characterized by monounsaturated fatty acids (MUFA) contributed more to the nitrogen removal efficiency of the IVCW system.
- IVCW,
- ammonium nitrogen,
- nitrate nitrogen,
- microbial community,
- FAMEs analysis

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References(28)

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