Distribution of Pb Isotopes in Different Chemical Fractions in Bed Sediments from Lower Reaches of the Xiangjiang River, Hunan Province of China

On the basis of the principles of Green Infrastructure and Building (GIB) in LEED for Green Neighborhood Development (LEED-ND), this paper studies the technical feasibility, economic soundness, and environmental effectiveness of a water-sourced energy system in a 6.5 million square feet mixed-use neighborhood development project in Changsha, Hunan Province, China. Two energy systems proposed for the project are compared in the study by using scientific fundamentals and engineering principle. The two energy systems are: • System One: Use Xiangjiang River as cooling water for absorption chillers to generate chilled water for all buildings. • System Two: Use traditional cooling towers providing cooling water for absorption chillers to generate chilled water for all buildings. The system performance analyses of study show that system one has better energy, environmental and economic performance than system two. Compared to system two, system one is predicted to have a saving of 32% in electricity, 11% in natural gas, and 675 ton/year in CO2 emission; and its system payback year is 8 years. This paper also investigated the impact of system one on the Xiangjiang River by using Fluent computational fluid dynamics (CFD). The results of the CFD simulation indicated that there no significant changes of river temperature over time.. Finally, some suggestions on design and operation have been provided for system one to be implemented.

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Assessment of Heavy Metals and Metalloids Contamination in the Surface Sediments of the Xiangjiang River, Hunan, China

E3S Web of Conferences ◽

10.1051/e3sconf/20185304037 ◽

2018 ◽

Vol 53 ◽

pp. 04037

Author(s):

Yu Zhong ◽

Guangyi Fu ◽

Renjun Xiang ◽

Fubing Yao ◽

Youze Xu ◽

...

Keyword(s):

Heavy Metals ◽

Flow Velocity ◽

Inductively Coupled Plasma ◽

Surface Sediments ◽

Quality Standard ◽

Hunan Province ◽

Overlying Water ◽

Xiangjiang River ◽

Inductively Coupled ◽

Plasma Mass Spectrometry

In this study, the Qingshuitang District from the Shifeng Bridge to the Majiahe Bridge was selected as study areas to assess the contamination status and release amount of heavy metals from the surface sediments of the Xiangjiang River, Hunan Province, China. A sum of five surface sediment samples were collected, and the total contents of Cu,Pb,Zn,Cd,Cr,Mn,As and Hg in these samples were measured by the Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Atom Absorption Spectrophotometer (AAS). Results showed that the average contents of Cd and As in the sediments were higher than the Grade III of the China Environmental Quality Standard for Soils. Moreover, release experiments were carried out to study the effect of flow velocity and pH values on the release of heavy metals from the sediments. The results suggested that increased the flow velocity and decreased the pH of overlying water could promote the release of heavy metals, while the release amount of four heavy metals were too small and the largest release amount of Mn was only 7.50 μg/(g·d). It suggested that the release of heavy metals from the sediments into the overlying water is a slow and long-term process.

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Risk Assessment of Heavy Metal in the Surface Sediment at the Drinking Water Source of the Xiangjiang River in South China

10.21203/rs.2.19404/v2 ◽

2020 ◽

Author(s):

Zhifeng Huang ◽

Chengyou Liu ◽

Xingru Zhao ◽

Jing Dong ◽

Binghui Zheng

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Drinking Water ◽

Ecological Risk ◽

Surface Sediment ◽

Anthropogenic Activities ◽

Organic Matter Content ◽

Hunan Province ◽

Drinking Water Source ◽

Xiangjiang River

Abstract Background: The Xiangjiang River is an important drinking water resource for the Hunan province of China. It is crucial to ascertain the pollution status, influencing factors, ecological risks, and possible sources of heavy metals in the sediments of the Xiangjiang River. Sediment is both a source and a sink of heavy metals in aquatic ecosystems. In this study, surface sediment was collected from the Zhuzhou Reach of the Xiangjiang River and eight heavy metals were investigated. Results: In all sediment samples, all eight heavy metals were detected and their average concentration fell in the order of Zn > Pb > As > Cu > Cr > Ni > Cd > Co. Assessment shows extremely serious Cd pollution and a very high potential ecological risk from Cd. According to correlation analysis and principle component analysis (PCA), As, Cu, Ni, Pb, and Zn originate from industrial wastewater and mineral smelting activities, whereas Co, Cr, and Ni come from natural sources. Redundancy analysis (RDA) reveals that the organic matter content and the particle size of the sediment have some influence on the enrichment of heavy metals. Conclusion: Among all eight examined heavy metals in the surveyed area, the content of Zn, Pb, and As is the highest, and that of Cd and Co is the lowest. Despite a low level of absolute content, the Cd in sediment already renders a high ecological risk and thus calls for urgent attention. Anthropogenic activities are the main source of heavy metals in the sediment. The distribution of heavy metals is also influenced by sediment properties. The results provide guidance for controlling heavy metal pollution and protecting drinking water sources in the Xiangjiang River.

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Level, Source, and Spatial Distribution of Potentially Toxic Elements in Agricultural Soil of Typical Mining Areas in Xiangjiang River Basin, Hunan Province

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17165793 ◽

2020 ◽

Vol 17 (16) ◽

pp. 5793

Author(s):

Yang Yu ◽

Haijiang Luo ◽

Lihuan He ◽

Wenqing Liu ◽

Renji Xu ◽

...

Keyword(s):

Toxic Elements ◽

Pollution Index ◽

Principal Component ◽

Potentially Toxic Elements ◽

Water Soluble ◽

Hunan Province ◽

Anthropogenic Sources ◽

Xiangjiang River ◽

Mining Areas ◽

Chemical Availability

The concentrations, chemical availability, distribution, and sources of potentially toxic elements (PTEs) in the soil of Xiangjiang Basin in Hunan Province, China were investigated at 85 sites. The highest mean concentrations of Cd, Cu, Zn, As, and Pb were observed in Hengyang, whereas those for Mn, Co, and Hg were observed in Changde. The pollution index values followed the order: Cd > Hg > Cu > Zn > As > Pb; the mean geo-accumulation index values were in the order: Cd > Hg > Pb > Cu > Zn > As > Co > Mn. Cd was associated with moderate contaminated level, Hg and Pb were associated with moderate contaminated to uncontaminated level, and Cu, Zn, As, Co, and Mn were associated with uncontaminated level of pollution. Furthermore, 64.5% of Cd was water-soluble and exhibited exchangeable fractions; its chemical availability posed a risk to the ecosystem. Spatial analysis, principal component analysis, and a positive matrix factorization model were used to assess the PTE sources. Four principal components contributed to 88.8% of the 8 PTEs concentrations. Mining, smelting, industrial, and agricultural activities, alongside sewage irrigation, the use of agrochemicals, and vehicular emissions are the possible anthropogenic sources that pollute agricultural products and threaten human health in the Xiangjiang Basin.

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Risk zoning of flood disaster based on GIS: A case study of Xiangjiang River, Hunan Province, China

2011 International Conference on Remote Sensing, Environment and Transportation Engineering ◽

10.1109/rsete.2011.5964809 ◽

2011 ◽

Author(s):

Shaoqing Li ◽

Hongwei Mo

Keyword(s):

Flood Disaster ◽

Hunan Province ◽

Xiangjiang River ◽

Risk Zoning

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Risk Assessment of Heavy Metal in the Surface Sediment at the Drinking Water Source of the Xiangjiang River in South China

10.21203/rs.2.19404/v1 ◽

2019 ◽

Author(s):

Zhifeng Huang ◽

Chengyou Liu ◽

Xingru Zhao ◽

Jing Dong ◽

Binghui Zheng

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Drinking Water ◽

Ecological Risk ◽

Surface Sediment ◽

Anthropogenic Activities ◽

Organic Matter Content ◽

Hunan Province ◽

Drinking Water Source ◽

Xiangjiang River

Abstract Background: The Xiangjiang River is an important drinking water resource for the Hunan province of China. It is crucial to ascertain the pollution status, influencing factors, ecological risks, and possible sources of heavy metals in the sediments of the Xiangjiang River. Sediment is both a source and a sink of heavy metals in aquatic ecosystems. In this study, surface sediment was collected from the Zhuzhou Reach of the Xiangjiang River and eight heavy metals were investigated.Results: In all sediment samples, all eight heavy metals were detected and their average concentration fell in the order of Zn > Pb > As > Cu > Cr > Ni > Cd > Co. Assessment shows extremely serious Cd pollution and a very high potential ecological risk from Cd. According to correlation analysis and principle component analysis (PCA), As, Cu, Ni, Pb, and Zn originate from industrial wastewater and mineral smelting activities, whereas Co, Cr, and Ni come from natural sources. Redundancy analysis (RDA) reveals that the organic matter content and the particle size of the sediment have some influence on the enrichment of heavy metals.Conclusion: Among all eight examined heavy metals in the surveyed area, the content of Zn, Pb, and As is the highest, and that of Cd and Co is the lowest. Despite a low level of absolute content, the Cd in sediment already renders a high ecological risk and thus calls for urgent attention. Anthropogenic activities are the main source of heavy metals in the sediment. The distribution of heavy metals is also influenced by sediment properties. The results provide guidance for controlling heavy metal pollution and protecting drinking water sources in the Xiangjiang River.

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