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Optimal Design of Splitters Attached to Turbo Blower Impeller by RSM

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Journal of Thermal science 2012年第3期21卷 215-222页

作者： Choon-Man Jang Ka-Ram Choi environmental engineering Research Division Korea Institute of Construction Technology

This paper describes the optimization of the impeller having splitters for a turbo *** design variables,chord of splitter and pitch of splitter,are introduced to enhance the blower *** pressure and ef-ficiency are selected as an object function,and the optimization of the blower impeller is performed by a response surface method (RSM).Three-dimensional Navier-Stokes equations are introduced to analyze the internal flow of the blower and to find the value of the object function for each *** the shape optimization of the splitters attached to the impeller in the turbo blower,pressure and efficiency at the design flow condition are suc-cessively increased by 5.9 percent and 17.9 percent respectively based on the reference *** higher blower efficiency obtained by optimization of impeller having splitters is mainly caused by reducing the number of im-peller blades and optimal design of splitters in the blade passage while pressure increase keeps almost the same with the reference *** the object function of pressure,pressure increase is obtained at the design and off-design conditions while efficiency keeps higher compared to the reference *** enhancement of blow-er performance is due to the reduction of reverse and circulation flows in the blade passage.

关键词： Turbo Blower Splitter Numerical Simulation Optimal Design Pressure Response Surface Method

Nanofiltration for drinking water treatment: a review

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Frontiers of Chemical science and engineering 2022年第5期16卷 681-698页

作者： Hao Guo Xianhui Li Wulin Yang Zhikan Yao Ying Mei Lu Elfa Peng Zhe Yang Senlin Shao Chuyang Y.Tang Membrane-based environmental&Sustainable Technology(MembEST)Group Department of Civil EngineeringThe University of Hong KongHong KongChina Key Laboratory for City Cluster environmental Safety and Green Development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou 510006China College of environmental science and engineering Peking UniversityBeijing 100871China College of Chemical and Biological engineering Zhejiang UniversityHangzhou 310027China Research and Development Center for Watershed environmental Eco-engineering Advanced Institute of Natural SciencesBeijing Normal UniversityZhuhai 519087China School of Civil engineering Wuhan UniversityWuhan 430072China

In recent decades,nanofiltration(NF)is considered as a promising separation technique to produce drinking water from different types of water *** this paper,we comprehensively reviewed the progress of NFbased drinking water treatment,through summarizing the development of materials/fabrication and applications of NF membranes in various scenarios including surface water treatment,groundwater treatment,water reuse,brackish water treatment,and point of use *** not only summarized the removal of target major pollutants(e.g.,hardness,pathogen,and natural organic matter),but also paid attention to the removal of micropollutants of major concern(e.g.,disinfection byproducts,per-and polyfluoroalkyl substances,and arsenic).We highlighted that,for different applications,fit-for-purpose design is needed to improve the separation capability for target compounds of NF membranes in addition to their removal of *** and perspectives on membrane fouling control,chlorine resistance,integrity,and selectivity are also discussed to provide potential insights for future development of high-efficiency NF membranes for stable and reliable drinking water treatment.

关键词： nanofiltration drinking water disinfection byproducts micropollutants selectivity

A distributed scheme developed for eco-hydrological modeling in the upper Heihe River

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science China Earth sciences 2015年第1期58卷 36-45页

作者： YANG DaWen GAO Bing JIAO Yang LEI Hui Min ZHANG YanLin YANG HanBo CONG ZhenTao State Key Laboratory of Hydro-science and engineering Department of Hydraulic EngineeringTsinghua University School of Water Resources and Environment China University of Geosciences Cold and Arid Regions environmental and engineering Research Institute Chinese Academy of Sciences

Modeling the hydrological processes at catchment scale requires a flexible distributed scheme to represent the catchment to- pography, river network and vegetation pattern. This study has developed a distributed scheme for eco-hydrological simulation in the upper Heihe River. Based on a 1 km x 1 km grid system, the study catchment is divided into 461 sub-catchments, whose main streams form the streamflow pathway. Furthermore, a 1 km grid is represented by a number of topographically similar ＂hillslope-valley＂ systems, and the hillslope is the basic unit of the eco-hydrological simulation. This model is tested with a simplified hydrological simulation focusing on soil-water dynamics and streamflow routing. Based on a 12-year simulation from 2001 to 2012, it is found that variability in hydrological behavior is closely associated with climatic and landscape condi- tions especially vegetation types. The subsurface and groundwater flows dominate the total river runoff. This implies that the soil freezing and thawing process would significantly influence the runoff generation in the upper Heihe basin. Furthermore, the runoff components and water balance characteristics vary among different vegetation types, showing the importance of coupling the vegetation pattern into catchment hydrological simulation. This paper also discusses the model improvement to be done in future study.

关键词： distributed scheme catchment discretization streamflow pathway hillslope parameterization the upper Heihe River

Strategies to improve electrochemical performances of pristine metal‐organic frameworks‐based electrodes for lithium/sodium‐ion batteries

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SmartMat 2021年第4期2卷 488-518页

作者： Zhoujia Liu Fenfen Zheng Weiwei Xiong Xiaogang Li Aihua Yuan Huan Pang School of environmental and Chemical engineering Jiangsu University of Science and TechnologyZhenjiangChina School of Chemistry and Chemical engineering Yangzhou UniversityYangzhouChina

Metal‐organic frameworks(MOFs)have attracted considerable attention as promising next‐generation active electrode materials for lithium‐ion batteries(LIBs)or sodium‐ion batteries(SIBs)because of ultrahigh specific surface area,uniformly distributed pores,and tunable ***,there are some disadvantages inevitably far from meeting commercial requirements,such as low conductivity,inconvenient electron transmission,and unsatisfactory circulation *** this review,a comprehensive summary of MOFs‐based electrode materials is presented and ***,the general Li^(^(+))/Na^(+)storage mechanism in MOFs‐based electrode materials,including conversion‐and insertion‐type reactions,are summarized with details of active inorganic/organic ***,MOFs as anode materials for LIBs/SIBs are emphasized and improved on the electrochemical ***,very few research literature on MOFs‐based cathode materials is also ***,opinions and prospects on the current challenge of MOFs‐based electrode materials are provided for future research directions.

关键词： improvement strategies lithium/sodium‐ion batteries metal‐organic frameworks

Effects of eggshell addition on calcium-deficient acid soils contaminated with heavy metals

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Frontiers of environmental science & engineering 2018年第3期12卷 69-78页

作者： Weiqi Luo Yanping Ji Lu Qu Zhi Dang Yingying Xie Chengfang Yang Xueqin Tao Jianmin Zhou Guining Lu School of Environment and Energy South China University of Technology Guangzhou 510006 China The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education Guangzhou 510006 China School of environmental science and engineering Zhongkai University of Agriculture and Engineering Guangzhou 510225 China South China Institute of environmental sciences Ministry of Environmental Protection Guangzhou 510655 China Guangdong Provincial engineering and Technology Research Center for environmental Risk Prevention and Emergency Disposal Guangzhou 510006 China

In this study, effects of water conditions （flooded, wet, or dry） and eggshell dosages （0, 0.1, 1.0, and 10.0 g/kg soil, respectively） on pH variation, content of unavailable state of heavy metals, form of heavy metals, and available nutritious element calcium （Ca） in acid soils contaminated with heavy metals were investigated, respectively. The soil samples were continuously cultivated indoors and analyzed by toxicity characteristic leaching procedure and community bureau of reference （BCR） sequential extraction procedure. The results showed that the addition of eggshell could effectively improve the pH of acid soil and increase it to neutral level. Moreover, the contents of unavailable state of heavy metals Cu, Zn, and Cd increased significantly. Furthermore, when the soil was cultivated under the flooded condition with 1.0 g/kg eggshell, the unavailable state ofCu, Zn, and Cd increased the most, and these heavy metals were transformed into residual state. On the other hand, the amount of available state of Ca increased to 432.19 from 73.34 mg/kg with the addition of 1.0 g/kg eggshell, which indicated that the addition of eggshell dramatically improved the available state of Ca. Therefore, eggshell could ameliorate the soil environment as it led to the decrease of available heavy metals and improvement of fertilization effectively. In a word, this study indicates that the addition of eggshell would be a new potential method for remediation of acid field soils contaminated with heavy metals.

关键词： Heavy metals Eggshell Acid soil remediation BCR sequential extraction

Effects of Shallow Groundwater Table on Soil Matric Potential and Hydraulic Characteristics

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Transactions of Tianjin University 2014年第6期20卷 463-468页

作者： Jiang Jianmei Zhao Lin Qi Yun Zhai Zhe School of Chemical engineering and Technology Tianjin UniversityTianjin 300072China School of environmental science and engineering Tianjin UniversityTianjin 300072China

Groundwater recharge significantly affects soil moisture redistribution through capillary rise. In this study,the soil matric potential at depths of 5, 10, 20 and 30 cm above the groundwater tables of 10, 30 and 60 cm weremeasured for 5 d. Soil hydraulic properties were analyzed by using the Philips and de Vries model. Results showedthat evaporation mainly influenced the matric potential of the shallow layer at the 5 cm depth regardless of the saturationof the layer. Groundwater recharge mainly affected soil moisture at the depth of 20 cm or more. A constant matricpotential layer existed between the evaporation front and capillary rise front where moisture content did not *** isothermal-liquid hydraulic conductivity （KLh） and the thermal-vapor hydraulic conductivity （KvT） were thedominant hydraulic conductivities in the liquid and vapor phases. At the groundwater table depths of 10, 30 and 60 cm,the mean peak values of KLh were 2.32×10^-7, 1.63×10^-7 and 0.29×10^-7 m/s, respectively, whereas the mean peakvalues of KvT were 2.7×10^-7, 2.4×10^-7 and 1.8 ×10^-7m/s, respectively.

关键词： shallow groundwater matric potential thermal hydraulic conductivity isothermal hydraulic conductivity

Multi-electron reaction concept for the universal battery design

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Journal of Energy Chemistry 2020年第12期29卷 416-417页

作者： Feng Wu Haoyi Yang Ying Bai Chuan Wu Beijing Key Laboratory of environmental science and engineering and School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

Electrochemical batteries define the contraption stores electricity in the direct form of chemical energy with high efficiency. If the energy conversion process can be reversed, namely the input and output of electricity both being permitted, the batteries are termed rechargeable batteries or also secondary batteries accordingly [1]. These decades have witnessed the rapid development of batteries because of the demands for transportation of information and mass in the mobile area, and stationary storage for the implementation of renewable energy technologies.

关键词： Multi-electron reaction Electrode material Redox chemistry

An updating of landslide susceptibility prediction from the perspective of space and time

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Geoscience Frontiers 2023年第5期14卷 295-307页

作者： Zhilu Chang Faming Huang Jinsong Huang Shui-Hua Jiang Yuting Liu Sansar Raj Meena Filippo Catani School of Infrastructure engineering Nanchang UniversityNanchang 330031China Department of Geosciences University of PaduaPaduaItaly Department of Civil Environmental and Architectural EngineeringUniversity of PaduaPadovaItaly Discipline of Civil Surveying and Environmental EngineeringPriority Research Centre for Geotechnical Science and EngineeringUniversity of NewcastleNSWAustralia

Due to the similarity of conditioning factors,the aggregation feature of landslides and the multi-temporal landslide inventory,the spatial and temporal effects of landslides need to be considered in landslide susceptibility prediction(LSP).The ignorance of this issue will result in some biases and time-invariance in landslide ***,a novel framework has been proposed to update landslide susceptibility by simultaneously considering the spatial and temporal effects of landslides at the regional *** this framework,the landslide inventory of Chongyi County has been divided into pre-and fresh-landslide *** to the LSP results predicted by the support vector machine(SVM)model using the slope unit-based conditioning factors and pre-landslide inventory,a normalized spatial distance index(NSDI)is calculated to quantitatively represent the spatial correlation between landslides and surrounding slope units to develop the SVM-NSDI ***,the SVM-Updating model,which incorporates the LSP results of the SVM-NSDI model and fresh-landslide inventory,could be developed to update the LSP ***,the confusion matrix,the area under the receiver operating characteristic curve(AUC)and frequency ratio(FR)accuracy are used to evaluate the prediction performance of the above LSP *** F1-score values of the SVM,SVM-NSDI and SVM-Updating models are 0.776,0.816 and 0.831,*** AUC values are 0.869,0.903 and 0.914 and the FR accuracies are 0.795,0.853 and *** can be concluded that landslide susceptibility is a time-variant variable,which can be updated by considering the spatial correlation between landslides and surrounding slope units as well as the temporal effects of multi-temporal landslide *** study provides a new framework to update landslide susceptibility over time and also provides more accurate LSP results for decisionmakers.

关键词： Landslide susceptibility updating Spatial effect Temporal effect Machine learning

Removal of odors and VOCs in municipal solid waste comprehensive treatment plants using a novel three-stage integrated biofilter:Performance and bioaerosol emissions

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Frontiers of environmental science & engineering 2021年第3期15卷 177-189页

作者： Jianwei Liu Peng Yue Nana Zang Chen Lu Xinyue Chen Beijing engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control Beijing University of Civil Engineering and ArchitectureBeijing 100044China Department of environmental science and engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China

A novel three-stage integrated biofilter(TSIBF)composed of acidophilic bacteria reaction segment(ABRS),fungal reaction segment(FRS)and heterotrophic bacteria reaction segment(HBRS)was constructed for the treatment of odors and volatile organic compounds(VOCs)from municipal solid waste(MSW)comprehensive treatment *** performance,counts of predominant microorganisms,and bioaerosol emissions of a flill-scale TSIBF system were *** and stable removal efficiencies of hydrogen sulfide,ammonia and VOCs could be achieved with the TSIBF system,and the emissions of culturable heterotrophic bacteria,fungi and acidophilic sulfur bacteria were relatively *** removal efficiencies of different odors and VOCs,emissions of culturable microorganisms,and types of predominant microorganisms were different in the ABRS,FRS and HBRS due to the differences in reaction conditions and mass transfer in each *** emissions of bioaerosols from the TSIBF depended on the capture of microorganisms and their volatilization from the *** rational segmentation,filling of high-density packings and the accumulation of the predominant functional microorganisms in each segment enhanced the capture effect of the bioaerosols,thus reducing the emissions of microorganisms from the bioreactor.

关键词： Biofiltration Multi-stage biofilter Volatile organic compounds Waste gas treatment Bioaerosol emissions