Field-validated Mg-biochar balls: In-situ nutrient recovery from Paddy runoff and compost enhancement for economic benefits

文献类型： 外文期刊

第一作者： Lu, Xinyue

作者： Lu, Xinyue;Wang, Lisha;Guo, Wenjing;Feng, Yanfang;Xue, Lihong;Wang, Lisha;Sun, Xiaolong;Sha, Aiguo;Feng, Yuanyuan

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关键词： Resource recovery; Field-validated trial; Metal-modified biochar balls; Aerobic composting; Economic benefits

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 520 卷

页码：

收录情况： SCI

摘要： Nitrogen and phosphorus are essential nutrients for all living organisms; however, excessive application of fertilizers has led to significant agricultural non-point source pollution. The recovery of these nutrients is critically important, particularly in light of the global scarcity of phosphorus resources. Hence, this study presents field-validated Mg-biochar balls (Mg-BCB) for in-situ nutrient recovery from paddy runoff and compost-driven economic gains. Biochar powder prepared by co-precipitation of MgCl2 and KOH was granulated into Mg biochar balls (Mg-BCB), Mg-BCB demonstrated efficient NH4+(20-27 %), NO3- (37-41 %), and total phosphorus (TP, 33-50 %) removal via ligand binding and surface precipitation in farmland ditches. The nitrogen and phosphorus saturated Mg-BCB (Mg-BCB-N/P) was repurposed as a composting additive, increasing total nutrient content by 30.82 % through lowered pH and higher composting temperatures to enhance microbial activity. Simulation analysis suggested Mg-BCB could recover 62 % of exogenous N/P inputs in Taihu Lake basin, projecting environmental economic profits of 206.35 RMB t-1 of Mg-BCB, with Yixing City estimated to attain 2.81 x 106 RMB annual benefits. The closed-loop strategy not only mitigates eutrophication but also converts non-points source pollutants into agricultural resources, addressing phosphorus scarcity while delivering scalable economic returns.

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