摘要
以太湖沉积物及上覆水为处理对象,通过室内微宇宙模拟实验,对比探究了苦草(V)、苦草-鲢鱼(VH)、苦草-铜锈环棱螺(VB)、苦草-鲢鱼-铜锈环棱螺(VHB)4种处理系统对沉积物及上覆水氮素去除特性的影响.结果表明:系统对上覆水及沉积物氮素去除率依次为VHB系统(17.65%)>VB系统(14.57%)>V系统(11.96%)>VH系统(9.05%);(动)植物对氮素的富集以及微生物脱氮作用是各系统去除氮素的主要途径,贡献率依次为微生物作用(83.41%~89.43%)>植物富集(9.97%~11.44%)>动物富集(4.06%~6.07%);苦草-鲢鱼-铜锈环棱螺(VHB)组合系统的协同作用能有效提升微生物脱氮效率,与其他处理组相比,沉积物亚硝化假单胞菌属(Nitrosomonas)、OLB12属、硝化螺旋菌属(Nitrospira)和硫曲菌属(Sulfuricurvum)等关键脱氮菌属丰度增加了29.83%~381.72%,沉积物硝化和反硝化速率分别增加了17.47%~117.72%和19.36%~146.65%,微生物脱氮量提升了15.61%~98.76%,强化了系统对氮素的去除效果.
The study investigated the nitrogen removal in sediment and overlying water using four treatment systems:Vallisneria natans(V),Vallisneria natans-Hypophthalmichthys molitrix(VH),Vallisneria natans-Bellamya aeruginosa(VB),and Vallisneria natans-Hypophthalmichthys molitrix-Bellamya aeruginosa(VHB).These systems were analyzed comparatively through indoor microcosm simulations using Lake Taihu sediments and overlying water.The results indicated that the nitrogen removal efficinecies of the systems for the overlying water and sediment were in the order of VHB system(17.65%)>VB system(14.57%)>V system(11.96%)>VH system(9.05%).Nitrogen enrichment by plants and animals,along with microbial denitrification,were the main pathways of nitrogen removal in each system.The contribution rates were in the order of microbial enrichment(83.41%~89.43%)>plant enrichment(9.97%~11.44%)>animal enrichment(4.06%~6.07%).The synergistic effect of the combined system of VHB significantly improved microbial denitrification efficiency.Compared to other treatment groups,the abundance of key denitrifying genera in the sediment,such as Nitrosomonas,OLB12,Nitrospira,and Sulfuricurvum,increased by 29.83%~381.72%.The rates of sediment nitrification and denitrification increased by 17.47%~117.72%and 19.36%~146.65%,respectively.Consequently,the amount of microbial denitrification increased by 15.61%~98.76%,enhancing the system′s overall nitrogen removal efficiency.
作者
韩旭
吴玮
黄天寅
许晓毅
庄金龙
HAN Xu;WU Wei;HUANG Tianyin;XU Xiaoyi;ZHUANG Jinong(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009;Key Laboratory of Suzhou Sponge City Technology,Suzhou 215009)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第12期37-48,共12页
Acta Scientiae Circumstantiae
基金
苏州市水利科技项目(No.2022001)
苏州市科技计划项目(No.SS202218)。
关键词
沉水植物
水生动物
沉积物
氮去除特性
微生物群落结构
submerged plant
aquatic animal
sediment
nitrogen removal performance
microbial community
作者简介
韩旭(1998-),男,E-mail:17315278745@163.com;吴玮,E-mail:wuwei@usts.edu.cn。
