Does rice straw addition and/or Vallisneria natans (Lour.) planting contribute to enhancement in nitrate nitrogen and phosphorus removal in constructed wetlands under low temperature?
文献类型： 外文期刊
作者： Cui, Naxin 1 ; Zhang, Xu 1 ; Cai, Min 1 ; Chen, Guifa 1 ; Zhou, Li 1 ; Zou, Guoyan 1 ;
作者机构： 1.Shanghai Acad Agr Sci, Eco Environm Protect Res Inst, Shanghai 201403, Peoples R China
2.Shanghai Engn Res Ctr Low Carbon Agr SERCLA, Shanghai 201415, Peoples R China
关键词： Constructed wetlands; Rice straw; Vallisneria natans; Microbial denitrification; Nutrient removal
期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：11.889； 五年影响因子：11.139 ）
ISSN： 0960-8524
年卷期： 2022 年 350 卷
页码：
收录情况： SCI
摘要： & nbsp;It is a global concern that nitrogen and phosphorus removal performances of constructed wetlands (CWs) are limited during cold weather. This study analyzed nutrient removal efficiencies and mechanisms in six CWs including combinations between evergreen submerged vegetation planting and rice straw adding under low temperature. The results showed that both unvegetated and vegetated CWs achieved the highest removal rates of total nitrogen (TN) (85.1-86.6%) and NO3--N (98.2-98.7%) with increases of approximately 56% and 68% by adding rice straw in water, respectively. Moreover, microbial denitrification accounted for reduction in over 70% of influent TN load. Planting vegetation, adding rice straw or their combination could all improve total phos-phorus removal. Compared with adding rice straw in sediment, more diversifying bacterial community and higher abundances of some anaerobic fermentative species in the rice straw biofilm might have contributed to higher nitrogen removal in CWs with rice straw added in water.
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