The Potential of Biochar as N Carrier to Recover N from Wastewater for Reuse in Planting Soil: Adsorption Capacity and Bioavailability Analysis

文献类型： 外文期刊

第一作者： Yu, Yingliang

作者： Yu, Yingliang;Yang, Bei;Duan, Jingjing;Yang, Linzhang;Xue, Lihong;Petropoulos, Evangelos

作者机构：

关键词： biochar; nitrogen carrier; adsorption; bioavailability; agricultural wastewater

期刊名称：SEPARATIONS （ 影响因子：2.6； 五年影响因子：2.7 ）

ISSN：

年卷期： 2022 年 9 卷 11 期

页码：

收录情况： SCI

摘要： Recovering nitrogen (N) from agricultural wastewater for reuse in planting fields is a more sustainable and economical strategy to limit N pollution than using conventional treatments. Hereby, regular biochar produced by wheat straw pyrolysis and Mg-modified biochar were used as the N carriers to assess inorganic-N adsorption from simulated agricultural wastewater and the potential for reuse of the carried N in a planting system. The results showed that biochar materials have different affinities towards inorganic-N types. The amount of biochar carried-N increased with the increase in inorganic-N concentration and reached 4.44 mg/g as the maximum. The biochar carried similar to 4 mg/g of inorganic N substituting nearly 40% of N fertilizer following a 1% w/w addition rate for vegetable planting. After a trial season, 34.7-42.7% of the carried N from biochar was assimilated by the plant, 45.9-53.7% was retained by the soil, and only about 10% was lost. In comparison to the condition with all N inputs from chemical fertilizer, the addition of part of N by the N-biochar matrix significantly reduced the N loss by improving the plant N uptake or increasing the N content in the soil. This study demonstrates that biochar materials could be used as N carriers to recover N from wastewater for reuse in soil, carrier stability, and bioavailability preservation.

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