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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Combined effect of matrix dams and paddy field drainage ditches on nitrogen and phosphorus removal

Jing Cheng https://orcid.org/0000-0001-6147-8356 A B , Hao Yang C , Haisheng Liu A * , Fangli Su D * , Hiba Shaghaleh E * , Yu Peng A and Yousef Alhaj Hamoud F
+ Author Affiliations
- Author Affiliations

A College of Hydraulic Engineering, Zhejiang Tongji Vocational College of Science and Technology, Hangzhou, 311231, PR China.

B College of Agricultural Science and Engineering, Hohai University, Nanjing, 210098, PR China.

C State Grid Xinyuan Hebei Funding Pumped Storage Co. Ltd, 1-1 Tianshan North Road, Qinhuangdao, PR China.

D College of Water Conservancy, Shenyang Agricultural University, Shenyang, 110866, PR China.

E School of Energy and Environment, Southeast University, Nanjing, 210096, PR China.

F College of Hydrology and Water Resources, Hohai University, Nanjing, 210024, PR China.


Handling Editor: Wan Zhanhong

Marine and Freshwater Research 76, MF24274 https://doi.org/10.1071/MF24274
Submitted: 4 December 2024  Accepted: 21 August 2025  Published: 23 September 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Nitrogen and phosphorus contaminants from paddy field drainage flow into the receiving bodies of water, posing a risk of eutrophication. To mitigate this pollution risk, several technologies, including constructed wetlands, ecological revetments and ecological floating beds, have been introduced in drainage ditches. However, the capacity of these technologies to intercept pollutants need to reconstruct the existing ditch structure.

Aims

This study aimed to optimise the interception and purification capabilities of drainage ditches through matrix dams.

Methods

A hydrodynamic and water-quality numerical model was established using the Mike 21 software, and the comprehensive ability of purifying pollutants by the interception of matrix dams and drainage ditches was evaluated.

Key results

We found that the overall average flow rate was reduced by 84% in the paddy field drainage ditch after introducing matrix dams, and pollutant concentrations decreased progressively from upstream to downstream. Total nitrogen concentrations were reduced by exceeding 60%, with a maximum reduction in total dissolved nitrogen concentrations of 84.3%.

Conclusions

Results indicated that the the combined deployment of drainage ditches and matrix dams is effective in removing nitrogen and phosphorus pollutants from paddy field drainage.

Implications

This study can provide a theoretical foundation for the practical implementation of matrix dams.

Keywords: adsorption material, flow rate, hydrodynamic numerical model, matrix dam, nitrogen and phosphorus removal, paddy field drainage ditch, pollutant concentration, water quality model.

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