Feasibility of improving nitrogen removal by integrating the rice straw and zeolite with drainage ditches for farmland runoff control

文献类型： 外文期刊

第一作者： Cai, Min

作者： Cai, Min;Zhang, Xu;Zhou, Li;Chen, Guifa;Zou, Guoyan;Cui, Naxin;Cai, Min;Zhang, Xu;Zhou, Li;Chen, Guifa;Zou, Guoyan;Cui, Naxin;Abdelhafez, Ahmed A.

作者机构：

关键词： Nitrogen removal; Agricultural wastes; Organic carbon source; Functional genes

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：5.263； 五年影响因子：5.116 ）

ISSN： 2352-1864

年卷期： 2021 年 21 卷

页码：

收录情况： SCI

摘要： Natural zeolite and rice straw have been widely used for removing nitrogen (N) from wastewater due to their different N removal mechanisms. In this study, the N removal performances of three substrate systems composed of zeolite (Z), rice straw (R) and their combination (ZR) were assessed for decontaminating farmland runoff characterized by high loads of ammonium - N or nitrate - N besides of a low carbon content. The N-cycling functional genes were also investigated. The results showed that ZR achieved significantly higher ammonium (48.9%-77.7%) and TN (39.7%-65.9%) removal rates than Z and R (P < 0.05). ZR also exhibited the highest removal rates of nitrate (67.6%-82.7%) and TN (45.5%-62.1%) in nitrate wastewater treatment. The abundances of 16S rRNA and denitrifying genes (including nirK, nirS, narG and napA) were significantly enhanced in ZR, which partly explained the higher N removal in the ZR than in the Z and R systems. These findings suggest that it is feasible to combine rice straw with zeolite as a substrate of drainage ditches for considerable N removal enhancement in the control of agricultural runoff. (C) 2021 Elsevier B.V. All rights reserved.

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