Spatiotemporal modeling of oxygen transport and layered regulation in tidal flow constructed wetlands.

IF 12.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-10-20 DOI:10.1016/j.watres.2025.124838

Rui Ma, Lanlan Fu, Jiangsen Ma, Lei Jiang, Yiyuan Zhuo, Linsong Cheng, Fangying Ji, Xiaoming Wang

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Abstract

Tidal flow constructed wetlands (TFCW) are widely used for treating domestic, industrial, agricultural, and aquaculture wastewaters due to their ecological advantages. However, the reoxygenation efficiency remains inconsistent across operational conditions, primarily because current practices rely on empirical oxygen enhancement strategies, lacking a mechanistic understanding of pore-scale oxygen dynamics and the interplay between oxygen supply and microbial demand during the resting phase. In this study, a spatiotemporal model (φ(x,t)) was developed to quantify the distribution of oxygen within the pores, revealing the synergistic effects of resting time, pollutant load, and the media particle size on oxygen transfer. A "tidal-layered oxygen supply" strategy was proposed to optimize multilayer microenvironments. The results demonstrated three distinct phases of oxygen variation during the resting period: rapid decline, stabilization, and gradual recovery. The model, with a high goodness-of-fit (R²=0.998), identified an oxygen-regulation-dominant layer (0-10 cm, η(x)=58 %) and diffusion-limited zones (>10 cm, η(x)<15 %). Convection (43.2 %) and diffusion (56.8 %) governed reoxygenation, forming a dual-phase mechanism: early convection dominance followed by sustained diffusion. This work provides the quantitative framework for dynamic oxygen regulation in TFCW, advancing beyond empirical approaches and offering strategies for precision oxygen management in tidal flow systems.

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潮汐流人工湿地氧输运的时空模拟及分层调节。

潮汐人工湿地（TFCW）因其生态优势被广泛用于处理生活、工业、农业和水产养殖废水。然而，在不同的操作条件下，再氧化效率仍然不一致，主要是因为目前的实践依赖于经验氧增强策略，缺乏对孔隙尺度氧动力学的机制理解以及静息阶段氧供应和微生物需求之间的相互作用。在本研究中，我们建立了一个时空模型（φ(x,t)）来量化氧在孔隙中的分布，揭示了静置时间、污染物负荷和介质粒径对氧传递的协同效应。提出了一种“潮汐分层供氧”策略来优化多层微环境。结果表明静息期氧变化有三个不同的阶段：快速下降、稳定和逐渐恢复。该模型具有较高的拟合优度（R²=0.998），确定了氧调节主导层（0 ~ 10 cm, η(x)= 58%）和扩散限制区（> ~ 10 cm, η(x)）。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.