Phosphorus emission control in rainfall-runoff from farmland by modified biochar

QIU Peng; ZHANG Tong; XU Jiawei; ZHANG Xiaolei; WANG Hongjie; LI Ji

doi:10.13205/j.hjgc.202505004

Volume 43 Issue 5

May 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(5): 28-37

QIU Peng, ZHANG Tong, XU Jiawei, ZHANG Xiaolei, WANG Hongjie, LI Ji. Phosphorus emission control in rainfall-runoff from farmland by modified biochar[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 28-37. doi: 10.13205/j.hjgc.202505004

Citation:

QIU Peng, ZHANG Tong, XU Jiawei, ZHANG Xiaolei, WANG Hongjie, LI Ji. Phosphorus emission control in rainfall-runoff from farmland by modified biochar[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 28-37. doi: 10.13205/j.hjgc.202505004

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Phosphorus emission control in rainfall-runoff from farmland by modified biochar

doi: 10.13205/j.hjgc.202505004

1. China Municipal Engineering Southwest Design and Research Institute Co., Ltd., Shenzhen 518109, China;
2. Harbin Institute of Technology, Shenzhen, Shenzhen 518055, China

Received Date: 2023-10-04
Accepted Date: 2024-02-10
Rev Recd Date: 2023-12-08

Available Online: 2025-09-11

Abstract

Abstract

The high concentration of phosphorus in farmland runoff along a river in Shenzhen leads to the risk of excessive phosphorus in the river section. Considering the characteristics of local rainy and dry seasons as well as short-term rainfall drainage， a metal-modified biochar-based phosphorus adsorption removal technology was proposed to control phosphorus in farmland rainfall-runoff. In this paper， the local abundant landscape plant deciduous biomass was used as the raw material， and the non-toxic metals Ca， Fe and Mg were used to modify it. The optimal pyrolysis temperatures were determined to be 500， 400 and 600 °C， and three metal-modified biochars （CaBC500， FeBC400， MgBC600） were prepared respectively. The metal-modified biochar was used as a filler to adsorb phosphorus in a fixed-bed reactor to treat the actual farmland runoff. The results showed that MgBC600 had the highest dynamic phosphorus adsorption capacity of 61.20 mg/g. The MgBC600/CaBC500 two-stage series fixed-bed reactor demonstrated better phosphorus removal efficiency in the early stage of adsorption. In addition， the metal-modified biochar was also mixed with soil to achieve the in situ phosphorus fixation. The results indicated an optimal doping ratio of 1%. The phosphorus fixation effects of FeBC400 and MgBC600 were relatively stable， and the fixation rate of phosphorus in the early precipitation was above 70% and 75%， respectively. The average concentrations of calcium ions， iron ions， and magnesium ions in the actual stormwater runoff were 1.771，0.159，1.773 mg/L， respectively， the concentrations of calcium ions and magnesium ions in the effluent water from the fixed bed increased slightly but remained below 5 mg/L， while the concentration of iron ions was consistently below 0.02 mg/L. The results demonstrated that the use of fixed beds with metal-modified biochar packing to control phosphorus in stormwater runoff achieved a low average concentration of dissolved metal ions and did not cause secondary pollution. At a doping ratio of 1%， the metal dissolution concentrations of the metal-modified biochar CaBC500， FeBC400， and MgBC600 were 3.553，0.003，4.013 mg/L， respectively， which didn't not cause secondary pollution.
- farmland rainfall-runoff,
- metal-modified biochar,
- phosphorus adsorption removal,
- in situ phosphorus fixation

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References(33)

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