Enhanced Nitrogen and Phosphorus Removal in a Vertical Flow Constructed Wetland with Acid-Modified Bamboo Biochar and Zeolite Composite Fillers under Dry-Wet Alternating Conditions

Shiyu Xu

doi:10.47297/taposatWSP2633-456912.20260707

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Enhanced Nitrogen and Phosphorus Removal in a Vertical Flow Constructed Wetland with Acid-Modified Bamboo Biochar and Zeolite Composite Fillers under Dry-Wet Alternating Conditions

Volume 7, Issue 7

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Enhanced Nitrogen and Phosphorus Removal in a Vertical Flow Constructed Wetland with Acid-Modified Bamboo Biochar and Zeolite Composite Fillers under Dry-Wet Alternating Conditions
Enhanced Nitrogen and Phosphorus Removal in a Vertical Flow Constructed Wetland with Acid-Modified Bamboo Biochar and Zeolite Composite Fillers under Dry-Wet Alternating Conditions
Department of Environmental Science, Hebei University of Environmental Engineering, Qinhuangdao, Hebei, 066000, China
Vol. 7, Issue 7, Pages: 61-70(2026)
Online First：21 August 2026，

Published：30 July 2026
DOI：10.47297/taposatWSP2633-456912.20260707
Accepted：

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Xu Shiyu.Enhanced Nitrogen and Phosphorus Removal in a Vertical Flow Constructed Wetland with Acid-Modified Bamboo Biochar and Zeolite Composite Fillers under Dry-Wet Alternating Conditions[J].Theory and Practice of Science and Technology,2026,07(07):61-70.
DOI：

Xu Shiyu.Enhanced Nitrogen and Phosphorus Removal in a Vertical Flow Constructed Wetland with Acid-Modified Bamboo Biochar and Zeolite Composite Fillers under Dry-Wet Alternating Conditions[J].Theory and Practice of Science and Technology,2026,07(07):61-70. DOI： 10.47297/taposatWSP2633-456912.20260707.

摘要

Abstract

Traditional constructed wetlands (CWs) often exhibit limited nitrogen and phosphorus removal efficiency when treating low carbon-to-nitrogen (C/N) ratio wastewater

primarily due to insufficient dissolved oxygen and endogenous phosphorus release from substrates. This study proposes a novel approach combining acid-modified bamboo biochar and natural zeolite as a composite filler in a vertical flow constructed wetland (VFCW) operated under dry-wet alternating cycles. Five operational regimes (W4D2

W2D4

W4D4

W8D4

W4D8) were investigated using synthetic wastewater (TN: 20 mg/L

TP: 5 mg/L). The results demonstrated that the optimal performance was achieved under the W8D4 regime (wet 8h + dry 4h). Under this condition

the average total nitrogen (TN) removal rates during the wet and dry phases reached 71.01% and 76.64%

respectively

while total phosphorus (TP) removal rates were 74.22% and 76.64%

respectively. The dry-wet alternation created distinct microenvironments: the hydraulic shear force during the wet phase promoted nitrification (average NH₄⁺-N removal of 86.90%)

while the static

oxygen-depleted conditions during the dry phase facilitated denitrification (average NO₃⁻-N removal of 45.76%). This work provides a promising strategy for decentralized wastewater treatment.

关键词

Keywords

references

Jiang, X. F., Yang, X. (2026). Analysis of rural water pollution control and treatment engineering technology. Rural Practical Technology , (01):47-48.

Qin, X. (2026). Design and application of vertical subsurface flow constructed wetland in advanced treatment of tail water from an industrial wastewater treatment plant. Environmental Protection and Circular Economy , 46(02):23-25.

Cui, Y. X., Ding, Y. (2026). Research progress on combined constructed wetland processes for nitrogen removal from waste water. Water Treatment Technology , :1-10. Advance online publication.

Ling, H. L. (2025). Research progress on nitrogen and phosphorus removal in constructed wetlands under low temperature conditions. Cleaning World , 41(12):36-38.

Sun, S., Ren, X., Shen, J., et al. (2025). Synergistic nitrogen and phosphorus elimination via iron-carbon micro-electrolysis in constructed wetlands treating low-pollution water. Water , 17(21):3139.

Tong, Y. X. (2025). Removal effect and mechanism of composite pollutants in aquaculture wastewater by substrate-improved vertical subsurface flow constructed wetland [Master's thesis ] . Shanghai Ocean University.

Li, S., Mou, J. H., Han, W. H., et al. (2026). Research progress on preparation, modification, and water treatment application of bamboo-based biochar. Chemical New Materials , :1-7. Advance online publication.

Zhang, H. F., Dzakpasu, M., Wang, X. C., et al. (2023). Adsorption characteristics of bisphenol A and sulfamethoxazole on bamboo-based biochar wetland substrate. Water Treatment Technology , 49(04):67-72+77.

Chen, X. Y. (2020). Mechanism of dry-wet alternation on nitrogen metabolism in constructed wetland ecosystems and its ecological model study [Doc toral dissertation ] . East China Normal University.

Zhai, X. T. (2025). Enhanced treatment of low C/N ratio wastewater by constructed wetlands based on biochar and pyrite [Master's thesis ] . Northeast Forestry University.

Wu, J. Y., Wu, Y. G., Lan, M. Y., et al. (2023). Purification of nitrogen and phosphorus from land-based aquaculture wastewater by composite constructed wetland and its microbial community characteristics. Chinese Journal of Environmental Engineering , 17(02):517-531.

Zhang, C. P., Wang, B., Li, S. Y., et al. (2017). Effects of hexachlorobenzene stress on root exudates of typical plants in dry-wet alternating constructed wetlands. Journal of Agro-Environment Science , 36(02):362-368.

Wang, P. S., Bai, X. L., Liu, J. L., et al. (2025). Progress in the application of biochar in constructed wetland. Environmental Science , 46(1):263-271.

Zhang, L. Y. (2025). Performance and mechanism of phenol wastewater purification by modified bamboo-based biochar [Master's thesis ] . Wuhan Polytechnic University.

Pang, R. F. (2024). Efficiency and mechanism of enhanced nitrogen and phosphorus removal in constructed wetlands by kitchen waste digestate biochar [Master's thesis ] . Chongqing Jiaotong Un iversity.

Zhu, M. B., Chen, Y. N., Xie, J. W., et al. (2026). Comparative study on the effect of different modification methods on Cd²⁺ adsorption performance of bamboo-based biochar. Chemical Engineering and Equipment , (03):1-5.

Liang, J. Y. (2025). Enhancement of nitrogen and phosphorus removal efficiency and mechanism of biofilter for rural domestic sewage based on biofilm enhancement [Master's thesis ] . Chinese Academy of Agricultural Sciences.

Guo, H., Zhai, X., Hu, M., et al. (2025). Atypical removals of nitrogen and phosphorus with biochar-pyrite vertical flow constructed wetlands treating wastewater at low C/N ratio. Bioresource Technology , 422:132219.