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
作者： Cai, Min 1 ; Zhang, Xu 1 ; Abdelhafez, Ahmed A. 3 ; Zhou, Li 1 ; Chen, Guifa 1 ; Zou, Guoyan 1 ; Cui, Naxin 1 ;
作者机构： 1.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China
2.Shanghai Engn Res Ctr Lowcarbon Agr SERCLA, Shanghai 201415, Peoples R China
3.New Valley Univ, Dept Soils & Water, Fac Agr, Kharga Oasis, Egypt
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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