Influence of Sediment, Plants, and Microorganisms on Nitrogen Removal in Farmland Drainage Ditches

The removal of nitrogen from water is a consequence of the synergistic action of plant uptake, sediment sorption, and microbial decomposition. However, there is a lack of long-term experimental studies on the effects of each component in the process of nitrogen removal. In this study, we investigate...

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Published in:Agronomy (Basel) 2023-09, Vol.13 (9), p.2211
Main Authors: Guo, Chenyao, Zhang, Qisen, Hu, Yawei, Zhao, Qiang, Li, Qiangkun, Wu, Jingwei
Format: Article
Language:English
Subjects:
Adsorption
Agricultural land
agricultural non-point source pollution
Ammonia
Aquatic microorganisms
Aquatic plants
Ditches
Drainage
Drainage ditches
Experiments
Microorganisms
Mineralization
Nitrates
Nitrogen
nitrogen migration
Nitrogen removal
pollutant removal
Pollutants
Pollution
Precipitation
purification mechanism
Rankings
Sediments
Sediments (Geology)
Water conservation
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Summary:The removal of nitrogen from water is a consequence of the synergistic action of plant uptake, sediment sorption, and microbial decomposition. However, there is a lack of long-term experimental studies on the effects of each component in the process of nitrogen removal. In this study, we investigated the effect of sediment, plants, and microorganisms on nitrogen removal by setting up three systems: water–sterilized sediment, water–sediment, and water–sediment–plant. The nitrogen removal effect followed the following rank order of effectiveness: the “water–sediment–plant” system > the “water–sediment” system > the “water–sterilized sediment” system. The ditch sediment had a strong enrichment effect for nitrogen. In addition, the migration rate of nitrogen in the sediment with different depths was different. The ammonia-nitrogen migration rate in the sediment showed an increasing trend with time and depth. The nitrate-nitrogen migration process in the sediment showed a trend of enrichment toward the middle layer (15.0–25.0 cm). Aquatic plants and microorganisms can promote the removal of nitrogen in water, with the average purification rates of 13.92% and 19.92%, respectively.
ISSN:2073-4395
2073-4395
DOI:10.3390/agronomy13092211