Underwater light source changes nitrogen and phosphorus removal pathways by Vallisneria spinulosa Yan growth system

IF 10.4 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Jinshan Zhao, Xiaolin Zhou, Chunzhen Fan, Zhiquan Wang, Zhan Jin, Ke Bei, Xiangyong Zheng, Min Zhao, Suqing Wu
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Abstract

Vallisneria spinulosa Yan (V.spinulosa Yan) with good ability of water purification is often used for ecological restoration of polluted water bodies. However, it is difficult to survive in turbid water bodies due to the low lighting condition. This study explored the feasibility of introducing artificial underwater light source into water bodies with high turbidity to strengthen the water restoration by V.spinulosa Yan. Addition of underwater light source promoted the clonal reproduction ability of V.spinulosa Yan, thus enhancing the removal loads of total nitrogen (TN), total phosphorus (TP), and nitrate nitrogen ( $${\mathrm{NO}}^{-}_{3}{\mbox{-}}{\mathrm{N}}$$ ) by 1.60–3.43 × 10−2, 1.49–3.49 × 10−3, and 0.80–2.06 × 10−2 g m−2 d−1, respectively. Underwater light source significantly reduced the abundance of microbial community on V.spinulosa Yan leaves, as well as most nitrifying bacteria (Nitrosomonadaceae) and denitrifying bacteria (Nitrospira, Comamonadaceae, and Rhodocyclaceae) in the system. But the attachment of some Cyanophyta (Chloroplast and Cyanobacteria) and Photosynthetic bacteria (Rhodobacter) onto the leaves and the growth of Methyloligellaceae in water and sediments were promoted. Nitrogen and phosphorus removal by the growth system of V.spinulosa Yan without underwater light source mainly depended on the biological processes by functional bacteria, while the absorption and co-assimilation effect of V.spinulosa Yan with underwater light source.

Abstract Image

Abstract Image

水下光源改变鹅掌楸(Vallisneria spinulosa Yan)生长系统的脱氮除磷途径
鹅掌楸(Vallisneria spinulosa Yan)具有良好的水质净化能力,常被用于污染水体的生态修复。然而,由于光照条件较差,它很难在浑浊的水体中存活。本研究探讨了在高浊度水体中引入人工水下光源以加强燕桫椤水体修复的可行性。添加水下光源可促进燕尾藻的克隆繁殖能力,从而提高其对总氮(TN)、总磷(TP)和硝酸盐氮($${mathrm{NO}}^{-}_{3}{\mbox{-}}{mathrm{N}}$$)的去除负荷,分别为1.60-3.43 × 10-2、1.49-3.49 × 10-3和0.80-2.06 × 10-2 g m-2 d-1。水下光源明显降低了燕麦叶片上微生物群落的丰度,也降低了系统中大部分硝化细菌(亚硝化单胞菌科)和反硝化细菌(亚硝化细菌科、科莫纳德菌科和Rhodocyclaceae)的丰度。但叶片上附着的一些蓝藻(叶绿体和蓝细菌)和光合细菌(Rhodobacter)以及水中和沉积物中的甲藻科(Methyloligellaceae)的生长却得到了促进。无水下光源的燕尾藻生长系统对氮和磷的去除主要依赖于功能菌的生物过程,而有水下光源的燕尾藻则具有吸收和同化作用。
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来源期刊
npj Clean Water
npj Clean Water Environmental Science-Water Science and Technology
CiteScore
15.30
自引率
2.60%
发文量
61
审稿时长
5 weeks
期刊介绍: npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.
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