Adsorption characteristics and mechanism of ammonia nitrogen and phosphate from biogas slurry by Ca2+- modified soybean straw biochar

文献类型： 外文期刊

第一作者： Wu, Xiaomei

作者： Wu, Xiaomei;Ye, Meifeng;Wu, Feilong;Li, Zhangting;Lin, Daiyan;Wu, Xiaomei;Yang, Rilong;Wang, Jinglong;Liu, Cenwei

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.7； 五年影响因子：3.8 ）

ISSN： 1932-6203

年卷期： 2023 年 18 卷 8 期

页码：

收录情况： SCI

摘要： The utilization of biogas slurry is critical for the sustainable development of animal husbandry. Biomass carbon adsorption is a feasible method for the recycling of nutrients from biogas slurry. However, research on the co-adsorption of ammonia nitrogen and phosphate is scarce. Herein, soybean straw was utilized as the raw material to prepare Ca2+- modified biochar (CaSSB), which was investigated for its ammonia nitrogen and phosphate adsorption mechanisms. Compared with natural biochar (SSB), CaSSB possesses a high H/C ratio, larger surface area, high porosity and various functional groups. Ca2+- modified soybean straw biochar exhibited excellent adsorption performance for NH4+- N (103.18 mg/g) and PO43-- P (9.75 mg/g) at pH = 6, using an adsorbent dosage of 2 g/L. The experimental adsorption data of ammonia nitrogen by CaSSB corresponded to pseudo-second-order kinetics and the Langmuir isotherm model, suggesting that the adsorption process was homogeneous and that electrostatic attraction might be the primary adsorption mechanism. Meanwhile, the adsorption of phosphate conformed to pseudo-second-order kinetics and the Langmuir-Freundlich model, whose mechanism might be attributed to ligand exchange and chemical precipitation. These results reveal the potential of CaSSBs as a cost-effective, efficient adsorbent for the recovery of ammonium and phosphate from biogas slurry.

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