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

7卷第7期

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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
2026年7卷第7期页码：61-70
网络首发：2026-08-21，

纸质出版：2026-07-30
DOI：10.47297/taposatWSP2633-456912.20260707
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Shiyu Xu. (2026). 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. 科技理论与实践（英文版）, 7(7), 61-70.

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.
Shiyu Xu. (2026). 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. 科技理论与实践（英文版）, 7(7), 61-70. DOI： 10.47297/taposatWSP2633-456912.20260707.

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

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