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Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization:A pilot-scale study

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Journal of Environmental Sciences 2025年第5期151卷 529-539页

作者： Xin Hu Hong Yang Xiaoyue Fang Xuyan Liu Jiawei Wang Xiaotong Wang Yongsheng Bai Bojun Su Key Laboratory of Beijing for Water Quality Science and Water Environmental Reco.ery Engineering Faculty of ArchitectureCivil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China Beijing General Municipal Engineering design&Research Institute co. Ltd.Beijing 100044China Hebei GEO University Shijiazhuang 050031China Hebei Key Laboratory of Water Quality Engineering and co.prehensive Utilization of Water Resources Hebei University of ArchitectureZhangjiakou 075000China School of Environmental Science and Safety Engineering Tianjin University of TechnologyTianjin 300384China Beijing Drainage Group co.Ltd. Beijing 100022China

As an energy and carbon saving process for nitrogen removal from wastewater,the partial nitrification and denitrification process(PN/D)has been extensively ***,achieving stable PNinmunicipalwastewater has always been *** this study,a gel immobilized PN/D nitrogen removal process(GI-PN/D)was established.A 94 days pilot-scale experiment was co.ducted using real municipal wastewater with an ammonia co.centration of 43.5±5.3mg N/L at a temperature range of 11.3–28.7◦*** nitrogen removal performance and associated pathways,shifts in the microbial co.munity as well as sludge yield were *** results were as follows:the effluent TN and co. were 0.6±0.4mg/L and 31.1±3.8 mg/L respectively,and the NAR exceeding 95%.GI-PN/D achieved deep nitrogen removal ofmunicipalwastewater through stable PN without taking any *** primary pathways for nitrogen removal were identified as denitrification,simultaneous nitrification-denitrification,and aerobic ***-throughput sequencing analysis revealed that the immobilized fillers facilitated the autonomous enrichment of functional bacteria in each reactor,effectively promoting the dominance and stability of the microbial *** addition,GI-PN/D had the characteristic of low sludge yield,with an average sludge yield of 0.029 kg SS/kg *** study provides an effective technical for nitrogen removal from municipal wastewater through PN.

关键词： Gel immobilization Partial nitrification Deep nitrogen removal Autonomous enrichment Sludge yield

Cross-section design of the flow channels in membrane electrode assembly electrolyzer for co.(2) reduction reaction through numerical simulations

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Chinese Chemical Letters 2025年第1期36卷 332-337页

作者： Lili Zhang Hui Gao Gong Zhang Yuning Dong Kai Huang Zifan Pang Tuo Wang Chunlei Pei Peng Zhang Jinlong Gong Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China co.laborative Innovation Center of Chemical Science and Engineering(tianjin) Tianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China National Industry-Education Platform of Energy Storage Tianjin UniversityTianjin 300350China Joint School of National University of Singapore and tianjin University International Campus of Tianjin UniversityFuzhou 350207China

Membrane electrode assembly(MEA)is widely co.sidered to be the most promising type of electrolyzer for the practical application of electrochemical co.(2) reduction reaction(co.(2)RR).In MEAs,a square-shaped cross-section in the flow channel is normally adopted,the co.figuration optimization of which co.ld potentially enhance the performance of the *** paper describes the numerical simulation study on the impact of the flow-channel cross-section shapes in the MEA electrolyzer for co.(2)*** results show that wide flow channels with low heights are beneficial to the co.(2)RR by providing a uniform flow field of co.(2),especially at high current ***,the larger the electrolyzer,the more significant the effect *** study provides a theoretical basis for the design of high-performance MEA electrolyzers for co.(2)RR.

关键词： Electrochemical reduction of co.(2) Membrane electrode assembly Mass transfer Gas diffusion electrode co.putational fluid dynamics

Precision-Engineered co.struction of Proton-co.ducting Metal-Organic Frameworks

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Nano-Micro Letters 2025年第4期17卷 230-274页

作者： Liyu Zhu Hongbin Yang Ting Xu Feng Shen Chuanling Si State Key Laboratory of Biobased Fiber Manufacturing Technology Tianjin Key Laboratory of Pulp and PaperTianjin University of Science and Technology300457 TianjinPeople’s Republic of China State Key Laboratory of Pulp and Paper Engineering South China University of Technology510640 GuangzhouPeople’s Republic of China Agro-Environmenta Protection Institute Ministry of Agriculture and Rural Affairs300191 TianjinPeople’s Republic of China Robustnique co.Ltd. Block CPhase IIPioneer ParkLanyuan Road300384 TianjinPeople’s Republic of China

Proton-co.ducting materials have attracted co.siderable interest because of their extensive application in energy storage and co.version *** them,metal-organic frameworks(MOFs)present tremendous development potential and possibilities for co.structing novel advanced proton co.ductors due to their special advantages in crystallinity,designability,and *** particular,several special design strategies for the structure of MOFs have opened new doors for the advancement of MOF proton co.ductors,such as charged network co.struction,ligand functionalization,metal-center manipulation,defective engineering,guest molecule inco.poration,and pore-space *** the implementation of these strategies,proton-co.ducting MOFs have developed significantly and profoundly within the last ***,in this review,we critically discuss and analyze the fundamental principles,design strategies,and implementation methods targeted at improving the proton co.ductivity of MOFs through representative ***,the structural features,the proton co.duction mechanism and the behavior of MOFs are discussed thoroughly and *** endeavors are also proposed to address the challenges of proton-co.ducting MOFs in practical *** sincerely expect that this review will bring guidance and inspiration for the design of proton-co.ducting MOFs and further motivate the research enthusiasm for novel proton-co.ducting materials.

关键词： MOFs Proton co.duction Porous materials Fuel cells

Ballistic response mechanism and resistance-driven evaluation method of UHMWPE co.posite

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Defence Technology(防务技术) 2025年第2期44卷 1-16页

作者： Yemao He Johnny Qing Zhou Yanan Jiao Hongshuai Lei Zeang Zhao Daining Fang Beijing Key Laboratory of Lightweight Multi-functional co.posite Materials and Structures Beijing Institute of TechnologyBeijing 100081China Beijing Protech New Material Science co. Ltd.Beijing 102200China School of Textile Science and Engineering Tiangong UniversityTianjin 300387China Key Laboratory of Advanced Textile co.posite Materials Ministry of EducationInstitute of Textile Composite MaterialsTiangong UniversityTianjin 300387China

The use of ultra-high molecular weight polyethylene(UHMWPE)co.posite in the design of lightweight protective equipment,has gained a lot of ***,there is an urgent need to understand the ballistic response mechanism and theoretical prediction model of *** paper explores the ballistic response mechanism of UHMWPE co.posite through experimental and simulation ***,a resistance-driven modeling method was proposed to establish a theoretical model for predicting the bulletproof *** ballistic response mechanism of UHMWPE co.posite enco.passed three fundamental modes:local response,structural response,and co.pled *** occurrence ratio of these fundamental response modes during impact was dependent on the projectile velocity and laminate *** bulletproof performance of laminate under different response modes was assessed based on the penetration depth of the projectile,the bulging height on the rear face of the laminate,the thickness of remaining sub-laminate,and residual velocity of the *** absolute deviations of bulletproof performance indicator between theoretical value and experimental value were well within 11.13%,demonstrating that the established evaluation model possessed high degree of prediction accuracy.

关键词： UHMWPE co.posite Ballistic response mechanism Theoretical model Performance evaluation

Effect of surface species on the alco.ol-acid adsorption from FTS wastewater on graphene:A structure-capacity study

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Journal of Environmental Sciences 2025年第3期149卷 651-662页

作者： Xiao Liu Xiaolong Zhang Chunyu Geng Qinglan Hao Jie Chang Xin Hu Yongwang Li Botao Teng tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco.utilization College of Chemical Engineering and Materials ScienceTianjin University of Science and TechnologyTianjin 300457China State Key Laboratory of Medicinal Chemical Biology Key Laboratory of Functional Polymer MaterialsCollege of ChemistryNankai UniversityTianjin 300071China National Energy Center for co.l to Liquids Synfuels China Co.Ltd.Beijing 101407China Institute of Sustainability of Chemical Energy and EnvironmentAgency for ScienceTechnology and Research627833Singapore Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal UniversityJinhua 321004China

Fischer-Tropsch synthesis(FTS)wastewater retaining low-carbon alco.ols and acids are organic pollutants as a limiting factor for FTS *** this work,the structurecapacity relationships between alco.ol-acid adsorption and surface species on graphene were reported,shedding light into their intricate *** graphene oxide(GO)and reduced graphene oxide(rGO)were synthesized via improved Hummers method with flake graphite(G).The physico.hemical properties of samples were characterized via SEM,XRD,XPS,FT-IR,and *** alco.ol-acid adsorption behaviors and adsorption quantities on G,GO,and rGO weremeasured via theoretical and *** was revealed that the presence of co.H,C=O and C–O species on graphene occupy the adsorption sites and increase the interactions of water with graphene,which are unfavorable for alco.olacid *** equilibrium adsorption quantities of alco.ols and acids grow in pace with carbon *** monolayer adsorption occurs on graphene was verified viamodel *** has the highest FTS modeling wastewater adsorption quantity(110 mg/g)due to the reduction of oxygen *** novel findings provide a foundation for the alco.olacid wastewater treatment,as well as the design and development of high-performance carbon-based adsorbent materials.

关键词： Alco.ol-acid adsorption Fischer-Tropsch synthesis wastewater Graphene Surface species Density functional theory

Metal-organic frameworks with dinuclear metal centers for synergistically boosting co.(2) photoreduction

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Science China Chemistry 2025年第1期68卷 201-208页

作者： Hui-Feng Wang Wen-Jie Shi Yu-Xin Yang Bao-Xia Dong Tong-Bu Lu Di-Chang Zhong School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Institute for New Energy Materials and Low Carbon Technologies School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

Dinuclear metal synergistic catalysis(DMSC)has been proved powerful in boosting co.(2)reduction,while this has not been achieved in heterogeneous catalysts with long-range order *** this study,we,by introduction of metal catalytic centers into an indium-based metal-organic framework(MOF),obtained a series of isostructural In-MOFs,including three MOFs with mononuclear metal catalytic center(M-In),three MOFs with dinuclear homometallic catalytic centers(MM-In),and three MOFs with dinuclear heterometallic catalytic centers(MM’-In,M/M’=co.II),Ni(II),Zn(II)).It was found that all these MOFs can serve as catalysts for photochemical co.(2)reduction to *** with M-In,the catalytic activities of MM-In were obviously enhanced,and that of MM’-In was further significantly *** example,the co.yield of co.Zn-In reaches a reco.d value of 12,700μmol g^(-1)h^(-1),which is 4.0,8.1,9.4,and 18.6-fold higher than that of co.co.In,Zn Zn-In,co.In,and Zn-In,***,the catalytic activities of co.Ni-In and Ni Zn-In also show different fold increase than those of co.responding dinuclear homometallic and mononuclear metallic *** results of co.trol experiments and theoretical calculation reveal that the higher catalytic activities of MM-In over M-In can be ascribed to the DMSC effect,and the higher catalytic activity of MM’-In over MM-In can be ascribed to the strengthened DMSC *** work reveals the relationship between DMSC effect and bimetal centers in co.(2)reduction,which provides new insights into the DMSC and paves a new way to design highly active catalysts for photochemical co.(2)reduction.

关键词： metal-organic frameworks dinuclear metal centers synergistic catalysis co.(2)reduction photocatalysis

Study of seismic behavior of PHC piles with partial normal-strength deformed bars

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Earthquake Engineering and Engineering Vibration 2020年第2期19卷 307-320页

作者： Zhang Xizhi Zhang Shaohua Xu Shengbo Niu Sixin architectural design&Research Institute of tianjin University Tianjin 300072China Key Laboratory of co.st Civil Structure Safety Ministry of EducationTianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Shandong Tong Yuan design Group co. Ltd.Jinan 250101China

Nine PHC piles with partial normal-strength deformed bars were prepared in present study,and cyclic loading tests were implemented to evaluate these piles’seismic *** influence of the axial co.pression ratio and the amount of normal-strength deformed bars on failure modes,crack patterns,strength,stiffness,and ductility were *** test findings indicate that the change of axial co.pression ratio has a noticeable influence on the failure mode of PHC piles.A larger axial co.pression ratio results in a higher cracking bending resistance,ultimate bending resistance,and initial stiffness,but the propagation heights of flexural cracks decrease as the axial co.pression ratio ***,increasing the amount of normal-strength deformed bars causes a slight decrease in ***,a calculation formula was proposed to predict the flexural capacity of PHC piles with partial normal-strength deformed bars.

关键词： PHC pile prestressed tendons deformed bars seismic behavior cyclic loading test flexural capacity

Method for rating energy performance of public buildings

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Frontiers in Energy 2014年第3期8卷 379-385页

作者： Jincheng XING Youli LI Jihong LING Huiyang YU Liwen WANG School of Environmental Science and Engineering Tianjin University Tianjin 300072 China tianjin Vanke Real Estate co. Ltd. Tianjin 300141 China Urban tianjin University Research Institute of architectural design & Planning Tianjin 300072 China

This paper discussed a co.parative study of several state-of-art methods for determining building energy co.sumption benchmark. A new approach, which co.bined the idea of ＂building benchmark＂ and ＂operational benchmark＂ in its rating system, was proposed. A case study was co.ducted which applied the proposed approach to benchmarking an existing office building in tianjin. Besides, the calculation of benchmarks of the reference building model and real building model using the rating method in eQUEST was also co.sidered. Furthermore, the simulation results of the reference building model were taken as the baseline to divide real office buildings into different energy performance grades.

关键词： energy co.sumption benchmark energy efficiency benchmark energy performance level

Application of the VOF method based on unstructured quadrilateral mesh

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Journal of Marine Science and Application 2008年第1期7卷 24-32页

作者：及春宁师颖 tianjin Key Laboratory of Harbor & Ocean Engineering Tianjin University Huahui architectural design & Engineering co. Ltd.

To simulate two-dimensional free-surface flows with co.plex boundaries directly and accurately, a novel VOF (Volume-of-fluid) method based on unstructured quadrilateral mesh is presented. Without introducing any co.plicated boundary treatment or artificial diffusion, this method treated curved boundaries directly by utilizing the inherent merit of unstructured mesh in fitting curves. The PLIC (Piecewise Linear Interface Calculation) method was adopted to obtain a seco.d-order accurate linearized reco.struction approximation and the MLER (Modified Lagrangian-Eulerian Re-map) method was introduced to advect fluid volumes on unstructured mesh. Moreover, an analytical relation for the interface’s line co.stant vs. the volume clipped by the interface was developed so as to improve the method’s efficiency. To validate this method, a co.prehensive series of large straining advection tests were performed. Numerical results provide co.vincing evidences for the method’s high volume co.servative accuracy and seco.d-order shape error co.vergence rate. Also, a dramatic improvement on co.putational accuracy over its unstructured triangular mesh co.nterpart is checked.

关键词： VOF unstructured quadrilateral mesh PLIC MLER