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Cloud-Model-Based Feature Engineering to Analyze the Energy-Water Nexus of a Full-Scale Wastewater Treatment Plant

Engineering 2024年第5期36卷 63-75页

作者： Shan-Shan Yang Xin-Lei Yu Chen-Hao Cui Jie Ding Lei He Wei Dai Han-Jun Sun Shun-Wen Bai Yu Tao Ji-Wei Pang Nan-Qi Ren State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150000China Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Civil and Environmental Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China China Energy Conservation and Environmental protection Group Beijing 100089China

Wastewater treatment plants(WWTPs)are important and energy-intensive municipal *** energy consumption and relatively low operating performance are major challenges from the perspective of carbon ***,water-energy nexus analysis and models for WWTPs have rarely been reported to *** this study,a cloud-model-based energy consumption analysis(CMECA)of a WWTP was conducted to explore the relationship between influent and energy consumption by clustering its influent’s *** principal component analysis(PCA)and K-means clustering were applied to classify the influent condition using water quality and volume *** energy consumption of the WWTP is divided into five standard evaluation levels,and its cloud digital characteristics(CDCs)were extracted according to bilateral constraints and golden ratio *** results showed that the energy consumption distribution gradually dispersed and deviated from the Gaussian distribution with decreased water concentration and *** days with high energy efficiency were extracted via the clustering method from the influent category of excessive energy consumption,represented by a compact-type energy consumption distribution curve to identify the influent conditions that affect the steady distribution of energy *** local WWTP has high energy consumption with 0.3613 kW·h·m^(-3)despite low influent concentration and volumes,across four consumption levels from low(I)to relatively high(IV),showing an unsatisfactory operation and management *** average oxygenation capacity,internal reflux ratio,and external reflux ratio during high energy efficiency days recognized by further clustering were obtained(0.2924-0.3703 kg O_(2)·m^(-3),1.9576-2.4787,and 0.6603-0.8361,respectively),which could be used as a guide for the days with low energy ***,this study offers a water-energy nexus analysis method to identify influent conditions with operational manageme

关键词： Wastewater treatment plants Cloud-model theory Data mining Principal component analysis K-means clustering Cloud-model-based energy consumption analysis

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Self-reaction of initial active groups in coal

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International Journal of mining Science and Technology 2012年第2期22卷 169-175页

作者： Qi Xuyao Wang Deming James A Milke Zhong Xiaoxing State Key Laboratory of Coal Resources and Mine safety School of Safety EngineeringChina University of Mining&TechnologyXuzhou 221008China Department of Fire protection Engineering University of Maryland.College ParkMD 20742USA

For further understanding of self-heating of coal, we tested the reactions of seven different ranks of coal under inert atmosphere. In the test, 50-gram of coal sample ranged from 0.18 mm to 0.38 mm was put into a special designed copper reaction vessel and let pure nitrogen to flow into the coal sample from the bottom at a rate of 100 mL/min. The programmed temperature enclosure was run at a programmed rate of 0.8 ~C/min. The concentration of the carbon oxides and the coal temperature were tested. The results show that the coal reactions under inert atmosphere can generate CO and C02. The reactions under inert atmosphere are affected by coal ranks, initial pore structure of coal and sulfur content. For low ranks of coal, the productions of carbon oxides are piecewise. The coal temperature is lower than the surrounding temperature throughout the reactions under inert atmosphere, but it rises quickly and reaches a crossing point temperature in the later stage under dry-air atmosphere. Based on the analysis, it indicates the self-reaction of initial active groups exists in the self-heating of coal besides the reactions in the two parallel reactions model. Spontaneous combustion of coal is due to both the oxidation heat accumulation and the chain reaction. A new reaction model of self-heating of coal was orooosed.

关键词： CoalSelf-heatingInitial active groupsSelf-reactionInert atmosphereCarbon oxides

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Life-cycle failure probability analysis of deteriorated RC bridges under multiple hazards of earthquakes and strong winds

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Earthquake Engineering and Engineering Vibration 2022年第3期21卷 811-823页

作者： Zheng Xiaowei Li Hongnan Jiangsu Key Laboratory of Environmental Impact and Structural safety in Engineering School of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhou 221116China State Lab.of Coastal and Offshore Engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China

Engineering structures may be exposed to one or more extreme hazards during their *** structural design specifications usually treat multiple hazards separately in designing structures and there is a limited probabilistic basis on extreme load ***,the performance of engineering structures will be deteriorated by the aggressive environments during their service periods,such as chloride attack,concrete carbonation,and wind-induced *** study presents a probabilistic methodology to assess the time-dependent failure probability of RC bridges with chloride-induced corrosion under the multiple hazards of earthquakes and strong *** loss of cross-section area of reinforcements and the reduction in strength of reinforcing steel and concrete cover induced by the chloride attack are ***,the Poisson model is employed to obtain the occurrence probabilities of the individual and concurrent earthquake and strong wind *** convolution integral is used to determine the joint probability distribution of combined load effects under simultaneous earthquakes and strong *** results indicate that the structural failure probability under multiple hazards increases significantly during the bridge′s life-cycle due to the chloride corrosion *** contribution of each hazard event on the total structural failure probability varies with ***,neglecting the combined influences of multiple hazards and chloride-induced corrosion may bring erroneous predictions in failure probability estimates of RC bridges.

关键词： life-cycle multihazard chloride occurrence model failure probability

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In situ synthesis of MIL-53-type eco-MOF from high-alumina fly ash for efficiently removing fluoride from water

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Progress in Natural Science:Materials International 2023年第5期33卷 681-690页

作者： Ning Yuan Kaiqi Tan Qiuyu Li Xinling Zhang Yixiang Bao State Key Laboratory of Water Resource protection and Utilization in Coal mining National Institute of Clean and Low Carbon Energy School of Chemical and Environmental Engineering China University of Mining and Technology

Facing ubiquitous fluoride pollution in aquatic environments and ever-increasing discharge of coal fly ashes,this study aims to in situ synthesize a kind of Al-based metal-organic framework eco-material(eco-MOF) using highalumina fly ash as metal raw material,and apply the obtained adsorbent to efficiently adsorb fluoride in *** synthesized eco-MIL-53(Al) exhibits excellent thermal stability,showcasing a consistent morphology of fine columnar crystals and possessing a high specific surface area(353 m2·g-1).Moreover,the adsorption isotherm demonstrates a strong agreement with the Langmuir isotherm model,indicative of a maximum uptake quantity of160 mg·g-1at 318 *** addition,fluoride adsorption experiments demonstrate that an increased dosage enhances the adsorption efficiency,the higher water pH value diminishes the removal efficiency,and the impact of coexisting anions is ***,the adsorption capacity is augmented with increasing temperature at high initial fluoride concentrations,but shows negligible variation at low initial fluoride *** is worth noting that the desiliconization filtrate can be applied to synthesize ZSM-5 zeolite,realizing the total utilization of fly *** present work provides a novel platform that would serve as a mutually beneficial reference for managing the environmental risks of fluoride and waste resource utilization.

关键词： Fluoride Fly ash Defluoridation Metal-organic frameworks Adsorption

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Rapid repair techniques for severely earthquake-damaged circular bridge piers with flexural failure mode

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Earthquake Engineering and Engineering Vibration 2017年第2期16卷 415-433页

作者： Sun Zhiguo Li Hongnan Bi Kaiming Si Bingjun Wang Dongsheng Department of Disaster Prevention Engineering Institute of Disaster Prevention Faculty of infrastructure Engineering Dalian University of Technology centre for Infrastructural Monitoring and protection School of Civil and Mechanical EngineeringCurtin University Institute of Road and Bridge Engineering Dalian Maritime University

In this study, three rapid repair techniques are proposed to retrofit circular bridge piers that are severely damaged by the flexural failure mode in major earthquakes. The quasi-static tests on three 1：2.5 scaled circular pier specimens are conducted to evaluate the efficiency of the proposed repair techniques. For the purpose of rapid repair, the repair procedure for all the specimens is conducted within four days, and the behavior of the repaired specimens is evaluated and compared with the original ones. A finite element model is developed to predict the cyclic behavior of the repaired specimens and the numerical results are compared with the test data. It is found that all the repaired specimens exhibit similar or larger lateral strength and deformation capacity than the original ones. The initial lateral stiffness of all the repaired specimens is lower than that of the original ones, while they show a higher lateral stiffness at the later stage of the test. No noticeable difference is observed for the energy dissipation capacity between the original and repaired pier specimens. It is suggested that the repair technique using the early-strength concrete jacket confined by carbon fiber reinforced polymer （CFRP） sheets can be an optimal method for the rapid repair of severely earthquake-damaged circular bridge piers with flexural failure mode.

关键词： rapid repair severely earthquake-damaged circular bridge piers flexural failure mode CFRP early-strengthconcrete

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Characterization of Sediment from Ourokessoum, North Cameroon: Morphostructural, Mineralogical, and Physicochemical Properties

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Journal of Geoscience and Environment protection 2024年第9期12卷 51-76页

作者： Atangana Jacqueline Ntsama Kadaguina Doussana Joseph Roland Atenga Essama Akoa Philémon Rémi Etoundi Bilobi Roland Touna Jean Pierre Nguetnkam Department of Earth Sciences Faculty of Science University of Yaound I Yaound Cameroon Department of Earth Sciences Faculty of Science University of Ngaoundere Ngaoundr Cameroon College of Civil Engineering and Architecture China Three Gorges University Yichang China Department of mining Geology School of Geology and Mining Engineering University of Ngaoundere Meiganga Cameroon

The present study examines the morphological, physicochemical, and mineralogical specificity of clay sediments in the Hamakoussou Basin with the objective of exploring their potential applications. Field data collection was followed by a series of physicochemical and mineralogical tests on the clay samples. Results show that the clay layers, which range in thickness from 11 - 120 cm, exhibit gray, yellowish, or greenish colors. From a physicochemical perspective, these clay layers are found to be basic with a pH ranging from 8.5 for the higher Hama2 layer to 7.6 for the lower Hama1 layer. The sum of exchangeable bases (S) is medium to high with higher values in the Hama1 layer (53.45 meq/100g) and lower values in the Hama3 layer (17.09 meq/100g). Similarly, the cation exchange capacity (CEC) varies from 62.32 meq/100g for the higher Hama1N4 clay layer to 35.6 meq/100g for the lower Hama1N3 clay layer. Mineralogically, the clay materials are primarily composed of smectites, with illite, kaolinite, calcite, quartz, feldspar, hematite, and goethite also present. This study emphasizes the versatility of clay in various industries and scientific domains. It is known for its impermeability, plasticity, and fossil-preserving capabilities, making it a valuable material for economic, practical, and academic applications.

关键词： Morphostructural Sediments Clay Layers Sedimentary Basin Hamakoussou

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Use of high-resolution X-ray computed tomography and 3D image analysis to quantify mineral dissemination and pore space in oxide copper ore particles

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International Journal of Minerals,Metallurgy and Materials 2017年第9期24卷 965-973页

作者： Bao-hua Yang Ai-xiang Wu Guillermo A.Narsilio Xiu-xiu Miao Shu-yue Wu Information Science and Engineering School Hunan International Economics UniversityChangsha 410205China Department of infrastructure Engineering The University of MelbourneVictoria 3010Australia Key Laboratory of High-efficient mining and safety of Metal Mines(Ministry of Education) University of Science and Technology BeijingBeijing 100083China

Mineral dissemination and pore space distribution in ore particles are important features that influence heap leaching performance. To quantify the mineral dissemination and pore space distribution of an ore particle, a cylindrical copper oxide ore sample (I center dot 4.6 mm x 5.6 mm) was scanned using high-resolution X-ray computed tomography (HRXCT), a nondestructive imaging technology, at a spatial resolution of 4.85 mu m. Combined with three-dimensional (3D) image analysis techniques, the main mineral phases and pore space were segmented and the volume fraction of each phase was calculated. In addition, the mass fraction of each mineral phase was estimated and the result was validated with that obtained using traditional techniques. Furthermore, the pore phase features, including the pore size distribution, pore surface area, pore fractal dimension, pore centerline, and the pore connectivity, were investigated quantitatively. The pore space analysis results indicate that the pore size distribution closely fits a log-normal distribution and that the pore space morphology is complicated, with a large surface area and low connectivity. This study demonstrates that the combination of HRXCT and 3D image analysis is an effective tool for acquiring 3D mineralogical and pore structural data.

关键词： high-resolution X-ray computed tomography 3D image analysis ore particles mineral dissemination pore space

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Classification and progress of extraction technologies for nonferrous metal resources

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Science China Chemistry 2024年

作者： Fangqin Cheng Na Zhou Nazeer Muhammad Nouman Li Cui Caixia Yin Institute of Resources and Environmental Engineering State Environmental Protection Key Laboratory of Efficient Utilization of Coal Waste Resources Shanxi University Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular ScienceShanxi University

In recent years, the demand for strategic metal resources, essential for scientific and technological progress and industrial development, has multiplied. Ensuring a stable supply of these metals is critical to national security and the well-being of the population. As global industrialization accelerates, the daily demand for nonferrous metals continues to rise. Consequently,extracting and recovering strategic metals from low-grade raw materials, such as solid waste, has become crucial for maintaining their supply and economic development. However, the extraction process is fraught with challenges, including mineral phase stability and complex composition. This review focuses on key strategic metals such as lithium, aluminum, gallium, and vanadium. It introduces and examines various methods for extracting nonferrous metals from different raw materials, including traditional mining technologies applied to low-grade solid wastes. It also outlines future development opportunities and challenges in this field.

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The role of potential soil cavity on ground subsidence and collapse in coal mining area

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Journal of Coal Science & Engineering(China) 2010年第3期16卷 240-245页

作者： OUYANG Zhen-hua Mine safety Technology Research Branch State Key Laboratory of Coal Mining and Environment Protection China Coal Research Institute Beijing 100013 China

Based on five basic assumptions, of the ground subsidence and collapse was using theoretical analysis method, the nature revealed from the mechanics point. Divided into four phases as groundwater level descent, soil cavity formation, soil cavity expansion, and ground collapse emersion, the whole process of ground subsidence and collapse was analyzed in detail. The study shows that ground subsidence and collapse is the macro- scopic performance and inevitable result of the soil cavity expansion and development, and the dynamic mechanics is the spalling force induced by the groundwater falling. The activities of underground water play a very important role in the process from the formation of soil cavity to the production of ground subsidence.

关键词： potential soil cavity ground subsidence and collapse groundwater spalling force

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Spatial variability of soil moisture in a mining subsidence area of northwest China

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International Journal of Coal Science & Technology 2022年第5期9卷 160-171页

作者： Lu Bai Yajing Wang Kai Zhang Yingming Yang Kaikai Bao Jiangang Zhao Xiaonan Li School of Chemical and Environmental Engineering China University of Mining and TechnologyBeijing 100083China State Key Laboratory of Water Resource protection and Utilization in Coal mining Beijing 102211China

The current study investigated the impact of coal mining on deep soil moisture from the perspective of the absolute value of soil moisture.A combined classical statistics and multi-dimensional geo-statistics approach was employed to analyze the temporal and spatial changes in soil moisture from 0 to 10 m in the mining face of the Nalin River No.2 Mine in Northwest China from the perspective of spatial *** results of the study show that compared with the control area,the average value of soil moisture in 1-and 2-year subsidence areas decreased by 1.18%and 0.96%,respectively,whereas the coefcient of variation increased by 17.92%and 3.63%,*** of soil moisture spatial distribution results showed that the spatial variability of soil moisture in the control area was less than that in the subsidence areas,and the spatial variability of soil moisture in the 2-year subsidence area was less than that in the 1-year subsidence area,indicating that mining increases the spatial variability of soil moisture and that the degree of spatial variability of soil moisture decreases as the subsidence enters the stable *** results provide evidence for the mechanism by which coal mining subsidence afects soil *** fow caused by surface cracks,soil texture,the soil pore microstructure,and other factors in the coal mining subsidence area are the primary drivers of the increase in spatial variability of soil moisture.

关键词： soil moisture subsidence

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