Yanran Dai

Wasser Cluster Lunz

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Wei Liang

Anshun University

Shuiping Cheng

Tongji University

Juan Wu

Zhejiang University of Technology

Feihua Wang

Sichuan Normal University

Fei Zhong

Nantong University

Naxin Cui

Shanghai Academy of Agricultural Sciences

Junjun Chang

Yunnan University

Yaocheng Fan

Institute of Hydrobiology

Zhenbin Wu

Institute of Hydrobiology

Deshou Cun

Yunnan University

Cooperative Institutions

Chinese Academy of Sciences

Institute of Hydrobiology

University of Chinese Academy of Sciences

Tongji University

University of Science and Technology of China

Wuhan University of Technology

State Key Laboratory of Pollution Control and Resource Reuse

Nantong University

China University of Geosciences

Guangzhou University

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Nitrogen removal from nitrate-laden wastewater by integrated vertical-flow constructed wetland systems

Ecological Engineering (2013)

Junjun Chang Suqing Wu Yanran Dai Wei Liang Zhenbin Wu

Constructed wetland

Subsurface Flow

10.1016/j.ecoleng.2013.06.039

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Citations (1)

Seasonal variation of microbial community for the treatment of tail water in constructed wetland

Water Science & Technology (2017)

Kang Liang Yanran Dai Feihua Wang Wei Liang

Effects of seasons and hydraulic loading rates (HLR) on the treatment performance and the response of the microbial community of vertical flow constructed wetland treating tail water were investigated. The seasonal treatment performance was evaluated at four HLR of 125, 250, 375 and 500 mm/d, respectively. The microbial community was detected by MiSeq Illumina platform at HLR 125 and 375 mm/d. The wetland showed significantly higher chemical oxygen demand (COD) and total nitrogen (TN), total phosphorus (TP) at HLR 125 mm/d, compared with other HLR. Overall removal efficiency was 61.47%, 71.40% and 76.31% for COD, TN and TP, respectively, while no significant differences for COD, TN and TP removal were found at HLR of 250, 375 and 500 mm/d. The best removal efficiency for COD and TN was achieved in summer and autumn, while the best TP removal was achieved in winter. Nitrification bacteria (Nitrosomonas and Nitrospira) were significantly higher in HLR 125 mm/d, whereas sequences associated with denitrification had no significant difference at the two HLR. The results can partially explain the significantly higher NH4+-N removal in HLR 125 mm/d and relatively low nitrogen performance in winter.

Nitrospira

Nitrosomonas

Nitrifying Bacteria

Constructed wetland

10.2166/wst.2017.124

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Citations (19)

Treatment performance and microorganism community structure of integrated vertical-flow constructed wetland plots for domestic wastewater

Environmental Science and Pollution Research (2012)

Suqing Wu Junjun Chang Yanran Dai Zhenbin Wu Wei Liang

10.1007/s11356-012-1307-0

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Citations (43)

Biological mechanisms associated with triazophos (TAP) removal by horizontal subsurface flow constructed wetlands (HSFCW)

The Science of The Total Environment (2016)

Juan Wu Yuqin Feng Yanran Dai Naxin Cui Bruce C. Anderson

Tap water

Constructed wetland

10.1016/j.scitotenv.2016.02.067

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Citations (31)

General trends in freshwater ecological restoration practice in China over the past two decades: the driving factors and the evaluation of restoration outcome

Research Square (Research Square) (2020)

Juan Wu Yanran Dai Shuiping Cheng

Abstract Background Although freshwater ecological restoration (FER) has undergone an immense development in China either in the number of projects or in the spatial scale of implementations, a dearth of clear and comprehensive trends in this field is still a particular concern. We conducted a literature survey through searching the database of Web of Science between 1998-2017.Results A total of 2047 publications were hit and 198 of them were finally retained after manual screening. The number of studies in this field has been steadily increasing in recent years and their provincial distribution is positively correlated with GDP growth and the investment to pollution control and protection, suggesting that economic development is a key driving factor of FER practice. Among the remained articles, nearly half (46.5%) focus on lake ecosystems, and 34.8% and 32.8% of the studies believe that land reclamation and eutrophication are the top two causes of freshwater ecosystem degradation. The overarching target of the restoration is biodiversity increase (31.4%), followed by water quality improvement (24.7%) and ecosystem services (23.9%). Revegetation is the dominant restoration approach (40.9%). Reference sites for assessment of restoration projects are normally control areas or locations without intervention (60%), or the status of the targeted sites before the interventions. For the restoration outcome evaluation, 86% of the studies present positive outcomes in terms of water quality improvement, and 79% have improvement in biological features. The most frequently monitored organisms are macrophytes (31%), then followed by benthos as indicators of ecological condition.Conclusions The literature research indicated that economic growth, water pollution and investment into environmental protection are the main driving factors of FER practice in China. Additionally, the effort of restoration and evaluation over the past two decades has not been limited to improving hydrological function and water quality, but also pay increasingly more attention to biological processes and ecological integrity, and further the ecosystem services in recent years. However, the lack of long-term monitoring and socioeconomic attributes considered in restoration success assessments are still particular issues needed to be addressed in the future FER researches and projects.

Restoration Ecology

Revegetation

10.21203/rs.2.19860/v1

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Citations (1)

Odor compounds and the related impact factors in Tangxi River, Hefei

Journal of Lake Sciences (2016)

Yang Zhou Yanran Dai Fei Zhong Juan Wu Li Zhu

以合肥市塘西河为研究对象,2014-2015年逐月对其水体水质和异味物质进行监测,同时结合塘西河浮游植物群落结构调查,综合分析塘西河异味物质变化规律及其影响因素.研究发现,塘西河异味暴发集中发生在夏季,夏季二甲基异莰醇浓度可达4909 ng/L,土腥素浓度可达197 ng/L.浮游植物群落结构调查表明,秋、冬季塘西河优势种类为蓝藻,春、夏季为硅藻、绿藻或隐藻.主成分分析得到5种主成分分别解释了光照、有机质、微生物活动、氮、磷等对水质的影响. 相关性分析结果表明,氮是塘西河异味的限制因素,水体中氮浓度较高是异味产生的重要原因.;The spatio-temporal variation of odor compounds, together with water quality parameters and composition and quantity of algae, were monitored in Tangxi River, Hefei City, during 2014-2015.The results showed that the odor in Tangxi River outbroke in summer and the highest concentration of 2-methylisoborneol and geosmin were 4909 and 197 ng/L,respectively.Extensive algae composition analysis revealed that Cyanophyta was the dominant species in autumn and winter, while Euglenophyta, Chlorophyta or Cryptophyta were the dominant species in spring and summer.Principal component analysis showed that the water quality was influent by light, organic compound, microbial activity, nitrogen and phosphorus in water.Additionally, significant relationships were detected between nitrogen concentration and odor compounds, which indicated that nitrogen was one of the main reasons for odor problems in Tangxi River.

Geosmin

10.18307/2016.0210

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Effects of macrophytes on ecosystem metabolism and net nutrient uptake in a groundwater fed lowland river

The Science of The Total Environment (2020)

Stefan Preiner Yanran Dai Matthias Pucher Rosanne E. Reitsema Jonas Schoelynck

Transport and transformation of inorganic nutrients are influenced by abiotic-biotic interactions and determine downstream water quality. Macrophytes play an important role in these complex ecological interactions. The role of macrophytes was studied in three reaches of the groundwater-fed, oligotrophic River Fischa with different macrophyte coverage and biomass. This was done by measuring metabolism and calculating changes in nutrient loading and concentrations, which were determined via an upstream-downstream mass balance approach. As the dominant autotrophs, we expected macrophytes (i) to have a direct effect by uptake and release, and (ii) an indirect effect by slowing down flow, which results in changed sedimentation patterns and altered conditions for heterotrophic microbial organisms implicating higher turnover and uptake rates. The seasonal development of macrophytes in 2017 had a strong impact on gross primary production, but not on ecosystem respiration. Increase in macrophyte biomass led to higher GPP (max. 5.4 g O2m−2d−1). ER was highest in autumn in the reach with intermediate macrophyte biomass (max. 10.1 g O2m−2d−1). We observed that the autotrophic uptake of phosphorus accounted for 80–145% of the P-PO4-flux and concluded that P-uptake by macrophytes from the sediment is an important source of phosphate for macrophytes in the river. By accumulating fine sediment, macrophytes are improving the availability of phosphate for their own long-term development. N-NO3, represented >99% of the nitrogen flux. N-NO3 net uptake was higher in the reaches with more macrophytes (0.84 vs. 0.12 g m−2d−1), but in average only 21% of the net uptake could be related to autotrophic nitrogen uptake in the reach with high macrophyte biomass. Dissimilatory uptake by heterotrophic organisms, most probably denitrification, were of high relevance. Macrophytes supported microbial uptake and release by improving conditions and slowing down flow. In the River Fischa, an oligotrophic river with low variability of environmental parameters, macrophytes greatly affected nutrient uptake by direct and indirect pathways.

Autotroph

10.1016/j.scitotenv.2020.137620

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Citations (44)

Comparing the effect of tailwater replenishment at different time intervals on eutrophic surface freshwater: a mesocosm simulation study

Water Science & Technology Water Supply (2021)

Haibin Tang Yanran Dai Yaocheng Fan Deshou Cun Xiaoyong Song

Abstract Tailwater is becoming the main water source supplied to surface freshwater worldwide. However, few studies have compared the effect of tailwater replenishment at different time intervals on eutrophic surface freshwater. In this study, we investigated the changes of water quality, sediment, and submerged macrophytes in eutrophic water in an outdoor mesocosm in response to different tailwater replenishment time intervals [every 7 days (TW7), 14 days (TW14) and 28 days (TW28)]. An 84-day simulation experiment demonstrated that there were only significant differences in the total nitrogen (TN) concentration of the overlying water, with the lowest mean value occurring in TW28. Nevertheless, the sediment TN was lowest in TW7 with a denitrification rate of 102.9 μmol/m2/h. Tailwater replenishment also increased the nitrogen content and total biomass of Vallisneria spiralis, and TW7 had the highest total biomass of 20.19 g. Additionally, tailwater replenishment also affected plant enzyme activity, causing an increase in superoxide dismutase, peroxidase, and catalase, coupled with a decrease in malondialdehyde concentration in leaves. Overall, TW28 can be adopted as a tailwater replenishment strategy to ensure water quality, whereas TW7 can be applied without a strict water quality requirement for TN.

Tailwater

Mesocosm

10.2166/ws.2021.375

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Citations (0)

Effects of Ceratophyllum demersum L. restoration on phosphorus balance at water–sediment interface

Ecological Engineering (2012)

Yanran Dai Suqing Wu Junjun Chang Chenrong Jia Wei Liang

Ceratophyllum demersum

10.1016/j.ecoleng.2012.04.003

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Citations (10)