中文关键词生物滞留池浒苔生物炭氨氮吸附特性吸附机制 英文关键词bioretention pondEnteromorpha prolifera biocharNH₄⁺-Nadsorption characteristicsadsorption mechanism

作者	单位	E-mail
陈友媛	中国海洋大学环境科学与工程学院, 青岛 266100 中国海洋大学海洋环境与生态教育部重点实验室, 青岛 266100 中国海洋大学山东省海洋环境地质工程重点实验室, 青岛 266100	youyuan@ouc.edu.cn
李培强	中国海洋大学环境科学与工程学院, 青岛 266100
李闲驰	山东省青岛第九中学, 青岛 266100
孙萍	中国海洋大学环境科学与工程学院, 青岛 266100
赵新月	中国海洋大学环境科学与工程学院, 青岛 266100
李洁	中国海洋大学环境科学与工程学院, 青岛 266100
李晋	中国海洋大学环境科学与工程学院, 青岛 266100
辛至然	中国海洋大学环境科学与工程学院, 青岛 266100

中文摘要 为探究生物滞留池填料（浒苔生物炭）处理雨水径流氨氮（NH₄⁺-N）的去除效果及机制，进行室内批量吸附实验，在对浒苔生物炭进行碱改性（1、2和3 mol·L^-1 NaOH改性，分别标记为BC1、BC2和BC3）基础上，开展改性前后浒苔生物炭对NH₄⁺-N吸附性能研究.结果表明：①适宜浓度的碱改性提高了浒苔生物炭的比表面积和表面微观结构，增加了O元素含量，丰富了表面官能团，其中BC2改性效果最好.②浒苔生物炭对NH₄⁺-N的吸附在pH值9.0和生物炭投加量0.5 g·L^-1时，吸附量最大，BC1和BC2的吸附量比BC分别提高6.4%和10.8%，BC3则降低13.7%，BC2吸附效果最好，饱和吸附量达16.76mg·g^-1.③浒苔生物炭对NH₄⁺-N的吸附机制为单分子层的化学吸附，吸附过程受到生物炭的高pH值、孔隙的静电吸引以及表面羟基（-OH）、羧基（-COOH）和碳氧单键（C-O）等官能团的络合氧化等的促进作用.综上所述，适量的NaOH来改性浒苔生物炭能够提高对NH₄⁺-N的吸附效果，可作生物滞留池的填料来去除NH₄⁺-N污染. 英文摘要 In order to study the performance and mechanisms of bioretention pond media (Enteromorpha prolifera biochar) for NH₄⁺-N removal in rainfall runoff, three kinds of alkali modified biochars (marked as BC1, BC2, and BC3) were prepared with various concentrations of NaOH solution (1, 2, and 3 mol·L^-1) to explore their adsorption performance for NH₄⁺-N. The results showed that:① Appropriate modifications of the NaOH concentration increased the specific surface area and surface microstructure of biochar, with the content of O and the surface functional groups being enriched. In addition, BC2 possessed the best adsorption performance. ② The adsorption capacity reached a maximum when the pH was 9.0 and the dosage of biochar was 0.5 g·L^-1. Compared with BC, the adsorption capacity of BC1 and BC2 increased by 6.4% and 10.8%, respectively, while BC3 decreased by 13.7%. Moreover, BC2 had an optimal adsorption efficiency with a saturated adsorption capacity of 16.76mg·g^-1. ③ The adsorption mechanism of biochar belonged to chemical adsorption with a monomolecular layer. The adsorption process was promoted by the high pH of biochar, the electrostatic attraction of biochar pores, the complexation and oxidization of the functional groups of hydroxyl (-OH), carboxyl (-COOH), and carbon-oxygen single bond (C-O). To sum up, the proper amount of NaOH to modify biochar can improve the adsorption performance of NH₄⁺-N, and the modified biochar can be used as media of the bioretention pond to remove NH₄⁺-N.

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