摘要：
Mining can provide abundant resources, but it also causes heavy metal wastewater pollution, which poses a serious threat to aquatic ecosystems. In this study, Cypridopsis vidua was used as the test organism to investigate the single and combined acute toxicity of common heavy metals (such as chromium (Cr) and nickel (Ni)) in mining wastewater. Then, a random forest model (RF model) was used to predict the combined toxicity of chromium and nickel. Single acute toxicity experiments showed that the 96 h-LC(50 )values of the Cr and Ni for Cypridopsis vidua were 0.81 mg/L and 4.3 mg/L, respectively. aCr was more toxic than Ni. Furthermore, the combined acute toxicity experiments demonstrated that the toxicity of Cr-Ni was higher than Ni but lower than Cr. The predicted results of the RF model were highly consistent with the experimental results of the Cr-Ni combined acute toxicity. So, the model has accurate toxicity prediction ability.
摘要：
Geopolymer is an amorphous cementitious material produced by geopolymerization using minerals or industrial waste as the main raw material under the action of activators. It can be used for safe treatment of heavy metal and radioactive pollution. This study applied molecular dynamics simulation to investigate the transport behaviour of uranyl nitrate in nanochannel of geopolymer, and focused on the influence of changes in the Si/Al ratio of geopolymer on the adsorption and diffusion of ions and water molecules. The simulation results described by density distribution, radial distribution function (RDF), hydrogen bonding network structure, mean square displacement (MSD) and diffusion coefficient. The density distribution shows that geopolymer has the strongest adsorption capacity for UO22+, followed by NO3-, and finally H2O. The results also indicate that the changes in molecular composition of geopolymer have a significant impact on kinetic characteristics of UO22+, NO3- and H2O. As the Si/Al ratio decreases, the adsorption capacity of geopolymer shows an upward trend, with the most significant improvement in the adsorption of UO22+. In addition, when the Si/Al ratio reduces, the migration rate of UO22+ and NO3- slows down. It could hinder the diffusion of ions in nanopores of geopolymer. The work could optimize the preparation of geopolymer adsorbent, and reveal the transport mechanism of uranyl nitrate in nanopore of geopolymer with different Si/Al ratios at the atomic scale.
期刊：
Journal of Building Engineering,2023年72:106503 ISSN：2352-7102
通讯作者：
Xie, D
作者机构：
[Zhang, Zixuan; Xie, D; Xie, Dong; Zhou, Lifeng; Wang, Lize] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Zhang, Zixuan; Xie, Dong; Zhou, Lifeng; Wang, Lize] Natl & Local Joint Engn Res Ctr Airborne Pollutant, Hengyang 421001, Peoples R China.
通讯机构：
[Xie, D ] U;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
关键词：
Building energy prediction;Bi-directional gated recurrent unit;Convolution neural network;Attention mechanism;Residual connection
摘要：
Accurate building energy consumption prediction is crucial to the rational planning of building energy systems. The energy consumption of buildings is influenced by various elements and is characterized by non-linearity and non-stationarity. To fully tap the time series characteristics of building energy consumption and heighten the model's prediction accuracy, this paper proposes a hybrid neural network prediction model combining attention mechanism, Bidirectional Gate Recurrent Unit (BiGRU), Convolutional Neural Networks (CNN), and the residual connection. The model uses BiGRU to train the extracted feature vectors by CNN on a two-way cycle. The attention mechanism highlights the key information extracted, and the residual connection is used to learn the features fully. Taking the energy consumption data of an office building in Guangzhou, China, as the object of study, the results indicate that the proposed model shows a stronger prediction accuracy than the commonly used model with an R2 of 90.74% and a CV-RMSE of 19.24%. Compared with the other five common models, the RMSE, MAPE, and MAE of the proposed model achieve lower error rates. Besides, the length 24 of the sliding window exceeds other lengths in the established model. The prediction accuracy of the established model in working hours outperforms the non-working hours of the office building. Building energy consumption prediction in the same season is better than that in the whole year.
期刊：
IOP Conference Series: Earth and Environmental Science,2020年510(4):042022- ISSN：1755-1307
通讯作者：
Li Nan
作者机构：
[Liu YingJiu; Duan ZhiYong; Li Nan] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Li Nan] U;Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
会议名称：
4th International Workshop on Renewable Energy and Development (IWRED)
会议时间：
APR 24-26, 2020
会议地点：
ELECTR NETWORK
会议主办单位：
[Li Nan;Duan ZhiYong;Liu YingJiu] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
摘要：
Both bioretention and sludge biochar have better effects to the removal of nitrogen and phosphorus removal in water.Combining them coulid improve the effect of bioretention on NH4+.After applying sludge biochar, the adsorption effect of filler on NH4+ was improved.When the sludge biochar was applied to the filler,on the top of the submerged area in the tank,the removal rate of NH4+ could reach 88.62%similar to 94.48%.
作者机构：
[Sun, Bo; Wang, Zhiyuan; Liu, Hui] Univ South China, Sch Architecture, Hengyang, Peoples R China.;[Xie, Shuibo] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.;[Wu, Haoyi] Planning & Land Affairs Ctr, Shenzhen, Guangdong, Peoples R China.
会议名称：
International Low Impact Development Conference (LID)
会议时间：
JUL 20-24, 2020
会议地点：
Bethesda, MD
会议主办单位：
[Sun, Bo;Wang, Zhiyuan;Liu, Hui] Univ South China, Sch Architecture, Hengyang, Peoples R China.^[Xie, Shuibo] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.^[Wu, Haoyi] Planning & Land Affairs Ctr, Shenzhen, Guangdong, Peoples R China.
会议论文集名称：
International Low Impact Development Conference 2020: Setting the Vision for the Next Twenty Years
摘要：
With the acceleration of the urbanization process, and the increase of the impervious surface area, the problems of urban waterlogging are becoming more and more serious. How to effectively reduce the frequency of urban rain and flooding and its impact and destruction has become a major problem in urban construction. This paper selects the area around Guangming Phoenix New City Park in Guangming District, Shenzhen, constructs regional rainfall runoff model by SWMM model, and simulates the operation of the existing drainage network and the degree of waterlogging under six types of rainstorm return period of 1a, 3a, 5a, 10a, 20a, and 50a. Consequently, on this basis, four kinds of low impact development (LID) measures including separating the placement of bioretention cells, green roof, permeable paving, and rain barrels, and combined arrangement as the fifth schemes, are used to stimulate the reduction of the regional total runoff and total peak flow. By the comparison, in the current state of study, LID combination has the best effect in reducing the total runoff, followed by the bioretention cells, permeable paving, and rain barrels; green roof is the worst. In terms of reducing total peak flow and delaying the time of peak flow, LID combination is the best, followed by bioretention cells, permeable paving, and green roof; the worst is rain barrels. In basis of this to consider the problem of combining low impact development measures with the sponge city special plan. In the future, it is expected to inspire the construction of sponge cities in south coastal cities, especially the low impact development measures.
作者机构：
[Lai, Xiaobo; Hu, Juntong; Liu, Yingjiu; Rong, Lishan; Xia, Lin; Yuan, Bin] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Tec, Hengyang 421001, Peoples R China.
会议名称：
6th International Conference on Energy Materials and Environment Engineering (ICEMEE)
会议时间：
APR 24-26, 2020
会议地点：
ELECTR NETWORK
会议主办单位：
[Rong, Lishan;Xia, Lin;Yuan, Bin;Lai, Xiaobo;Hu, Juntong;Liu, Yingjiu] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Tec, Hengyang 421001, Peoples R China.
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
摘要：
This research inclines to study the ramification on arbuscular mycorrhizal fungi (AMF), including Glomusclaroideum (G. claroideum) and G. mosseae strains as well as the repair process of perennial ryegrass (Lolium perenne L.) in the uranium-containing soils. Three times at 120 degrees C for an hour was required to disinfect the soil mixture. Spraying the uranium (U3O8) into the soil mixture and mixing until the ingredients were thoroughly blended,serving the purpose of obtaining the uranium-containing soil mixture with 5 mg/kg U3O8. A week later, AMF was inoculated into every flowerpot and chamber facility. Seeds of perennial ryegrass were cultivated with thirty seeds in each flowerpot or each indoor equipment in a fortnight's time.Perennial ryegrass plants tended to be harvested after sowing and meeting the conditions of 60 days.Three substances are detected by three different detection means(Photosynthetic pigments, soluble proteins, and malondialdehyde correspond to ethanol extraction method, Coomassie brilliant blue method, and thiobarbituric acid method, respectively). Additionally,testing included activities of alkaline phosphatase and succinate dehydrogenase as well. Moreover, Hitachi H-7650 transmission electron microscope performed the function of observing cellular and subcellular distributions of uranium in plant epidermal cells.Photosynthetic pigment standards of perennial ryegrass are subject to AMF,which not only has a tendency to enhance the soluble protein levels in perennial ryegrass,but also gains the possibility of holding up the uranium-induced improvement of malondialdehyde levels in perennial ryegrass. G. mosseaes is properly more efficacious than G. claroideum in the attenuation of uranium damages in cell structures of perennial ryegrass. Our results demonstrate that AMF is capable of developing the capacity of perennial ryegrass on repairing the uranium-related soil contamination.
摘要：
In the process of electrokinetic (EK) remediation of uranium-contaminated soil, the existence form of uranium in soil pore fluid will affect on its migration behavior. In this paper, a novel type of electrolyte (citric acid + ferric chloride, CA+ FeCl3) has been investigated for the EK remediation of uranium-contaminated red soil. The effects of different electrolyte and the concentrations of FeCl3 on migration behavior of U(VI) and environmental risks were investigated after EK remediation. The result showed that the optimum concentration was 0.1 mol/L CA mixed with 0.03 mol/L FeCl3 in this study. At this time, the removal efficiency of uranium was about 61.55 +/- 0.41%, and the cumulative energy consumption was 0.2559 kWh. Compared with deionized water and single CA, combined CA with FeCl3 has the advantages of high removal efficiency, low leaching toxicity, and less damage to the soil after the electrokinetic remediation treatment.
会议名称：
18th Annual World Environmental and Water Resources Congress of the Environmental-and-Water-Resources-Institute (EWRI)
会议时间：
JUN 03-07, 2018
会议地点：
Minneapolis, MN
会议主办单位：
[Duan, Zhiyong;Xie, Shuibo;Chen, Zhenfu;Wang, Jingsong;Li, Zhi] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称：
World Environmental and Water Resources Congress 2018: Water, Wastewater, and Stormwater; Urban Watershed Management; Municipal Water Infrastructure; and Desalination and Water Reuse
摘要：
Constructed wetlands technology is an important type of wastewater treatment technologies. Compared with other wastewater treatment technologies, the aquatic plants are special components in constructed wetlands for water pollutants removal. However, the comprehensive functions of aquatic plants in constructed wetlands were little emphasized before. In this study, the comprehensive functions and effects of aquatic plants in constructed wetlands to the water pollutants removal are investigated. Multiple common used aquatic plants are compared with their biomass, nitrogen and phosphorus absorption capacity, and oxygen secretion by root systems. These are used to investigate the mechanisms of the functions of aquatic plants in water pollutants removal in constructed wetlands. In this study it is found different types of aquatic plants have different comparable advantages in biomass, nitrogen and phosphorus absorption capacity, and oxygen secretion by root systems. The aquatic plants in constructed wetlands provide dissolved oxygen to the environment around their roots. The aquatic plants themselves have absorption for the nitrogen and phosphorus to directly removal them from the wastewater. Their roots together with the fillers in the constructed wetlands establish the habitat environment for the microorganisms which degrade the water pollutants. The aquatic plants play important and special roles in constructed wetlands for wastewater treatment. These findings can be used for the improvement of the water pollutants removal efficiency in constructed wetlands. The improved constructed wetlands can be used for eutrophication control with higher efficiency.
作者机构：
[Cui, Wenping; Chen, Wenzhao] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Chen, Wenzhao] U;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
会议名称：
2nd International Workshop on Advances in Energy Science and Environment Engineering (AESEE)
会议时间：
FEB 02-04, 2018
会议地点：
Zhuhai, PEOPLES R CHINA
会议主办单位：
[Chen, Wenzhao;Cui, Wenping] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
会议论文集名称：
AIP Conference Proceedings
摘要：
The SMW method has many advantages, such as little influence on the surrounding environment, good watertight performance, wide range of application, short construction period, low cost and so on. In this paper, we chose the SMW engineering method combined with anchor cable to support structure in the second phase deep foundation pit of Jinan LuJinDongCheng as the research object, monitored and analysed the horizontal displacement of the pile top, Peripheral surface subsidence and internal force of the anchor cable in the foundation pit. We also discussed the displacement, internal force of anchor cable and the settlement of surrounding environment in the excavation of foundation pit and in different stages of construction. Conclusion:(1)The maximum horizontal displacement of the retaining structure is closely related to the depth and time of excavation, the construction of anchor cable can well limit the deformation of pile body; (2)Groundwater seepage caused by foundation pit dewatering will change the effective stress of soil. The change of groundwater level has an important influence on the working behavior of smw anchor cable supporting structure.
作者：
Duan, Zhiyong*;Diaz-Ramirez, Jairo;Martin, James L.;Zeng, Taotao;Liu, Yingjiu
期刊：
WORLD ENVIRONMENTAL AND WATER RESOURCES CONGRESS 2018: WATERSHED MANAGEMENT, IRRIGATION AND DRAINAGE, AND WATER RESOURCES PLANNING AND MANAGEMENT,2018年:398-403
通讯作者：
Duan, Zhiyong
作者机构：
[Liu, Yingjiu; Zeng, Taotao; Duan, Zhiyong] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.;[Martin, James L.; Diaz-Ramirez, Jairo] Dept Civil & Environm Engn, Mississippi State, MS 39762 USA.
通讯机构：
[Duan, Zhiyong] U;Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
会议名称：
18th Annual World Environmental and Water Resources Congress of the Environmental-and-Water-Resources-Institute (EWRI)
会议时间：
JUN 03-07, 2018
会议地点：
Minneapolis, MN
会议主办单位：
[Duan, Zhiyong;Zeng, Taotao;Liu, Yingjiu] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.^[Diaz-Ramirez, Jairo;Martin, James L.] Dept Civil & Environm Engn, Mississippi State, MS 39762 USA.
会议论文集名称：
World Environmental and Water Resources Congress 2018: Watershed Management, Irrigation and Drainage, and Water Resources Planning and Management
期刊：
IOP Conference Series: Earth and Environmental Science,2018年153:400-407 ISSN：1755-1307
通讯作者：
Xiao, X.
作者机构：
[Zhang, P.; Xiao, X.; Zhang, Q.] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Xiao, X.] U;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
会议名称：
2nd International Workshop on Renewable Energy and Development (IWRED)
会议时间：
APR 20-22, 2018
会议地点：
Guilin, PEOPLES R CHINA
会议主办单位：
[Xiao, X.;Zhang, P.;Zhang, Q.] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
摘要：
In order to study the seismic behavior of eccentrically braced frames with different braces, nonlinear finite element analysis of two eccentrically braced frames with Y and K shapes is carried out by using the software ABAQUS. Q235 steel is used in the K and Y shaped energy dissipation section and support in composite steel frames, and the other components are composed of Q345 and Q460 grade steel respectively. The analysis results show that both of them have good energy dissipation under the low cyclic loading; Under the same amount of steel., with the steel grade increases for the frame beam and column, the energy dissipation capacity of Y and K shape has greatly improved, the energy dissipation capacity of link beam Y shape frame is better than that in K shape frame; the overall energy consumption ability of Y shape frame is also better than that of K shape frame, and Y shape frames have many advantages such as easy repair after the earthquake, , save steel, and high economic benefit.
摘要：
MWNTs are reacted with CM-β-CD to obtain CM-β-CD-g-MWNTs with great dispersivity. The effects of pH value, initial concentration of uranium, contact time and adsorbent dosage on the adsorption behavior were investigated. The results show that pH=5,the initial concentration of uranium was 10mg/L, the adsorption of uranium on CM-β-CD-g-MWNTs after 90 min, and the adsorption capacity is 19.42 mg/g at 25°C. Kinetics and isothermal were better fitted by Langmuir isotherm model and pseudo-second-order kinetic model, and the maximum adsorption capacity was 92.65mg/g. The composites had been antegrallty made, the -C=O,-C-O and -OH palyed irreplaceable role by SEM,EDS and FTIR.
期刊：
IOP Conference Series: Earth and Environmental Science,2017年64(1) ISSN：1755-1307
通讯作者：
Zhou, Shukui
作者机构：
[Chang, Zhe; Zhou, Shukui] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
通讯机构：
[Zhou, Shukui] U;Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
会议名称：
International Symposium on Resource Exploration and Environmental Science (REES)
会议时间：
APR 14-16, 2017
会议地点：
Ordos, PEOPLES R CHINA
会议主办单位：
[Chang, Zhe;Zhou, Shukui] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
摘要：
The uranium tailings in southern China was used as the object of study to study the fixation and migration characteristics of nuclide U in shallow tailings. The results showed that the precipitation of tailings in the tailings soil was not linearly related to the depth during the acid rain leaching process. Tailings soil in the role of fixatives, when the lime as a fixative, the tailings of different soil uranium in 20 days after the re-precipitation. However, when lime and ammonium phosphate were used as fixing agents, the cumulative precipitation of U had a significant effect, and the migration of uranium was inhibited.
