Field engineering application of agricultural farmland surface runoff pollution treatment by combined bioreactor and constructed wetlands

Luo, Huibo; Li, X.; Chen, Y.; Liu, X.; Zhang, K.; Fu, Xun; Jiang, Bing; Xue, Rui; Yang, Jing; Li, M.; Chen, W.; Fan, Liangqian; Chen, F.; Zhang, Xiangfei; Anderson, Bruce

doi:10.1007/s13762-021-03449-1

Cited by 2 publications

(1 citation statement)

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“…However, ecological ditches do not perform well at low temperatures, and they may even become N sources (Wang et al, 2017). Luo et al reported that the average removal rate of total nitrogen (TN) from agricultural surface runoff on farmland in constructed wetlands was 29.64% (Luo et al, 2022). Additionally, during heavy rainfall events, this method does not have a good effect to the elevated N concentrations (Wei et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Reduction of nitrogen loss in runoff from sloping farmland by a ridged biochar permeable reactive barrier with vegetated filter strips

Zhang,

Gao,

et al. 2024

Front. Environ. Sci.

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IntroductionEutrophication due to nitrogen (N) loss from sloping farmland has a high risk in the Three Gorges Reservoir. Biochar and vegetated filter strips (VFS) are used to control nutrient runoff and increase soil water-holding capacity, soil nutrient retention, and crop yield. However, surface biochar application has limited ability to control N loss, especially from sloping farmland.MethodsIn this study, different widths of ridged biochar permeable reactive barrier (RB-PRB) with VFS were employed to intercept N loss in runoff from sloping farmland. Adsorption characteristics of biochar for nitrate and ammonium N were evaluated using isothermal and kinetic adsorption models before field experiments. N index values for ammonium (NH4+), nitrate (NO3−), dissolved N (DTN), particulate N (PN), and total N (TN) lost through runoff were monitored from April 2019 to January 2020.ResultsNO3− and NH4+ sorption on biochar was predominantly physical adsorption with a maximum capacity of 4.51 and 4.12 mg g-1, respectively. During the research period, the dominant transportation pathway of N loss involved dissolved total N movement through subsurface flow, which accounted for 65.55% of the total loss. TN loss for CK was 1954 g·hm-2, while RB-PRB and VFS decreased N loss from sloping farmland by 36.7%. The interception efficiency of RB-PRB was highest at 0.3 m width. VFS successfully intercepted particulate N and reduced it by 32.75%. In terms of soil nutrients, the RB-PRB and VFS interventions led to a substantial 41.69% increase in the TN content of the soil at a 0.4 m width.DiscussionThe findings suggest that biochar has a favorable adsorption effect on NH4+ and NO3−, an appropriate width of RB-PRB with VFS could effectively reduce nitrogen loss from sloping farmland. Simultaneously, it enhances the water and fertilizer retention capacity of sloping cropland soil; however, the long-term implications necessitate further validation.

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Section: Introductionmentioning

confidence: 99%