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Higher N_(2)O production in sequencing batch reactors compared to continuous stirred tank reactors:effect of feast-famine cycles

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Frontiers of Environmental Science & engineering 2023年第4期17卷 143-154页

作者： Xinjie Yan Xunyu Shen Jipeng Wang Jinlong Zhuang Yu Wang Jinchi Yao Hong Liu Yongdi Liu James P.Shapleigh Wei Li National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery East China University of Science and TechnologyShanghai 200237China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental EngineeringEast China University of Science and TechnologyShanghai 200237China School of Environmental and Safety Engineering Changzhou UniversityChangzhou 213164China Shanghai Huayi Group Co.Ltd. Shanghai 201108China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200237China Department of Microbiology Cornell UniversityIthacaNY 14850USA

Nitrous oxide(N_(2)O)is a potent greenhouse gas that can be emitted during the biological treatment of *** this study,a comparison of the long-term performance characteristics and N_(2)O production of sequencing batch reactors(SBR)and continuous stirred tank reactors(CSTR)during nitrite-based denitrification was *** was found that both reactors had NO_(2)^(-)-N removal efficiencies over 99.9%,but the N_(2)O-N emissions from the SBR reached~2.3%of the removal nitrite-N load,while in the CSTR it never exceeded 0.1%.High frequency sampling during one operation cycle of the SBR demonstrated that the N_(2)O accumulation ratio was~0.1%during the feast period,increased to~1.9%in the first five hours of the famine period,and then gradually reached~2.3%at the end of *** experiments showed that limiting extracellular electron donor is required for N_(2)O accumulation in cells from the SBR-famine period and that cells from the CSTR do not accumulate N_(2)O when either nitrite or carbon is *** notable difference in the two reactor communities was the high level of accumulation of intracellular granules,most likely polyhydroxybutyrate(PHB),in cells during the feast period in the *** assembly and binning found that one genome(PRO1),which is a Thauera,accounted for over half the metagenomic reads in both *** shifts in gene regulation nor community composition explained the observed differences in reactor performance suggesting some post-transcriptional regulation obligatorily linked to antecedent conditions underly increased N_(2)O production in the SBR.

关键词： Denitrifying N_(2)O mitigation SBR CSTR Meta-omics PHB

Defect promoted photothermoelectric effect in densely aligned ZnO nanorod arrays for self-powered position-sensitive photodetection

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Journal of Materiomics 2022年第3期8卷 693-701页

作者： Xinxin Du Weiliang Tian Ziqi Zhang Bin Hui Jiahui Pan Jianhua Sun Kewei Zhang State Key Laboratory of Bio-Fibers and Eco-Textiles Collaborative Innovation Center for Marine Biomass FibersMaterials and Textiles of Shandong ProvinceCollege of Materials Science and EngineeringInstitute of Marine Biobased MaterialsQingdao UniversityQingdao266071China Key Laboratory of Chemical Engineering in South Xinjiang College of Life ScienceTarim UniversityAlar843300China Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology Guangxi UniversityNanning530004China

Sustainable light energy from ambient environment has attracted particular attention to meet the evergrowing need of small-scale *** modulation of intercorrelated thermal and electronic transport is one of the crucial aspects for reliable photothermoelectric ***,a defectpromoted photothermoelectric effect is demonstrated in densely aligned ZnO nanorod array with rich lattice *** defect-rich ZnO device delivers high electrical conductivity and large Seebeck coefficient to enable significant improvement of photothermoelectric energy conversion and self-powered *** position sensitivity reaches approximately 0.19 mV mm^(-1),and the temperature gradient induced electric field makes up for the suppression in the photothermoelectric *** synergism between intrinsic defects and extra temperature field plays an important role in promoting the photothermoelectric properties of dense ZnO nanorod *** study is interesting for interpreting the thermo-phototronic phenomena as well as demonstrating the possibility of defect engineering and phonon engineering to enable highly efficient light energy scavenging and self-powered photodetection.

关键词： Defect-rich ZnO Photodetectors Light energy Photothermoelectric Self-powered

Ru-Catalyzed Chemoselective Methoxycarbonylation of Methyl Pentenoate: An Assistant Role of Chloride Anions

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SSRN 2023年

作者： Zhang, Shu Sun, Rui Guan, Pengxin Wang, Yaofeng Wang, Ling Zhu, Yanli Han, Lijun Xin, Jiayu Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing China

Alkoxycarbonylation of alkene has been an important basis in modern chemical industry. As the cheapest noble metal, the potential of ruthenium furnishes significant innovations in the homogeneous catalysis. However, the competitive hydrogenation of alkenes to alkanes represents the most challenge in the alkoxycarbonylation of alkene. Herein, the chloride anions-assisted Ru-catalyzed methoxycarbonylation of methyl pentenoate was *** chemoselectivity of methoxycarbonylation can be improved by controlling the ratio of LiCl/Ru3(CO)*** experiments show that the activation energy of hydrogenation is increased due to the change of the active species by increasing the amount of LiCl, which hinders the hydrogenation of methyl pentenoate. The di-methoxycarbonylation of 1,7-octadiene indicates that this methodology has the potential to develop the Ru-catalyzed di-methoxycarbonylation of diene substrates. © 2023, The Authors. All rights reserved.

关键词： Olefins

Recent progress in ternary mixed matrix membranes for CO_(2) separation

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Green Energy & Environment 2024年第5期9卷 831-858页

作者： Zikang Qin Yulei Ma Jing Wei Hongfang Guo Bangda Wang Jing Deng Chunhai Yi Nanwen Li Shouliang Yi Yi Deng Wentao Du Jian Shen Wenju Jiang Lu Yao Lin Yang Zhongde Dai College of Architecture and Environment Sichuan UniversityChengdu610065China College of Carbon Neutrality Future Technology Sichuan UniversityChengdu610065China National Engineering Research Centre for Flue Gas Desulfurization Chengdu610065China Carbon Neutral Technology Innovation Center of Sichuan Chengdu610065China School of Chemical Biological and Materials EngineeringUniversity of OklahomaNormanOK73019USA Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an710049China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China US DOE Natl Energy Technol Lab626 Cochrans Mill RdPittsburghPA 15236USA DongFang Boiler Co. Ltd.China Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province Chengdu611731China College of Environment and Resources Xiangtan UniversityXiangtan411105China

Mixed matrix membranes(MMMs)could combine the advantages of both polymeric membranes and porousﬁllers,making them an effective alternative to conventional polymer ***,interfacial incompatibility issues,such as the presence of interfacial voids,hardening of polymer chains,and blockage of micropores by polymers between common MMMsﬁllers and the polymer matrix,currently limit the gas sep-aration performance of *** phase MMMs(consisting of aﬁller,an additive,and a matrix)made by adding a third compound,usually functionalized additives,can overcome the structural problems of binary phase MMMs and positively impact membrane separation *** review introduces the structure and fabrication processes for ternary MMMs,categorizes various nanoﬁllers and the third component,and summarizes and analyzes in detail the CO_(2) separation performance of newly developed ternary MMMs based on both rubbery and glassy *** on this separation data,the challenges of ternary MMMs are also ***,future directions for ternary MMMs are proposed.

关键词： CO_(2) separation Mixed matrix membranes Ternary phase

Topology-Informed Graph Convolutional Network for Fault Diagnosis 11

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Topology-Informed Graph Convolutional Network for Fault Diag...

11th IEEE Data Driven Control and Learning Systems Conference, DDCLS 2022

作者： Jia, Mingwei Liu, Yi Xu, Danya Yang, Tao Yao, Yuan Institute of Process Equipment and Control Engineering Zhejiang University of Technology Hangzhou310023 China Northeastern University State Key Laboratory of Synthetical Automation for Process Industries Shenyang110819 China National Tsing Hua University Department of Chemical Engineering 30013 Taiwan

ISBN: (数字)9781665496759

ISBN: (纸本)9781665496759

The development of an accurate data-driven fault diagnosis model faces several obstacles. One significant challenge is how to combine the model with the process mechanism rationally and improve the model interpretability. In this work, a fault diagnosis method based on a topology-informed graph convolutional network (TIGCN) is proposed. This model first uses the empirical knowledge that analyzes the operating state of the process and combines the operating data to construct a signed directed graph. Then the operating data is divided into three modalities in the time dimension. The model utilizes a well-designed spatial-temporal convolutional layer and signed directed graph to construct different modalities separately to effectively detect fault types. The superior fault diagnosis performance of the proposed TIGCN model is demonstrated on the Tennessee-Eastman process as compared to traditional approaches. © 2022 IEEE.

关键词： Failure analysis

Resilient Learning-Based Control Under Denial-of-Service Attacks 63

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Resilient Learning-Based Control Under Denial-of-Service Att...

63rd IEEE Conference on Decision and Control, CDC 2024

作者： Chakraborty, Sayan Gao, Weinan Vamvoudakis, Kyriakos G. Jiang, Zhong-Ping New York University Can Lab BrooklynNY11201 United States Northeastern University State Key Laboratory of Synthetical Automation for Process Industries Shenyang110819 China Georgia Institute of Technology The Daniel Guggenheim School of Aerospace Engineering GA30332-0150 United States

ISBN: (纸本)9798350316339

In this paper, we have proposed a resilient reinforcement learning method for discrete-time linear systems with unknown parameters, under denial-of-service (DoS) attacks. The proposed method is based on policy iteration that learns the optimal controller from input-state data amidst DoS attacks. We achieve an upper bound for the DoS duration to ensure closed-loop stability. The resilience of the closed-loop system, when subjected to DoS attacks with the learned controller and an internal model, has been thoroughly examined. The effectiveness of the proposed methodology is demonstrated on an inverted pendulum on a cart. © 2024 IEEE.

关键词： Inverted pendulum

Enhancing Electricity Generation from Water Evaporation Through Multiscale Fibers Network Structure

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SSRN 2024年

作者： Kong, Haoran Li, Yuting Yan, Jin Liu, Xiang Xiang, Mingxue Wang, Qinhuan Wang, Yu State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing100049 China

Harvesting energy from the water−solid interface through natural water evaporation provides a promising approach for generating sustainable electricity to power self-powered electronics. Advancing the bio-based hydrovoltaic materials enhances sustainability, with wood as a viable candidate due to the inherent hydrophilic and charged properties. However, current wood-based water evaporation-induced electricity generators (WEIGs) mainly depend on the "top-down" construction strategies. Wherein, the improvement of power density is constrained by the limited structural regulation, nondiverse building blocks, and monolithic enhancement mechanisms. Here, the high-performance wood-based WEIGs based on multiscale fibers network (MFN) structure are reported by embedding the Ti4O7 nanofibers (T4NF) inside the assemblies of TEMPO-oxidized cellulose nanofibrils (TOCNF) through a "bottom-up" route. Benefiting from the large specific surface area, high surface potential, and photothermal effect of conductive T4NF, the WEIG achieves a high short-circuit current of ~12 μA while delivering ~0.85 V open-circuit voltage. This work presents an efficient method to boost performance while understanding the impact of functional MFN on water evaporation. © 2024, The Authors. All rights reserved.

关键词： Nanofibers

Direct Numerical Simulations of Internal Flow Inside Deformed Bubble by Phase-Field-Based Lattice Boltzmann Method

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SSRN 2024年

作者： Zhang, Huahai Fu, Shaotong Xiang, Xing Su, Weite Guo, Zhenjiang Wang, Limin State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing100049 China

Internal flow mechanism inside deformed bubble was investigated through direct numerical simulation by Allen-Cahn phase-field-based lattice Boltzmann method and theoretical model developed from Bernoulli equations. The effects of key parameters such as bubble size and gas or liquid physical properties on bubble dynamic behaviors were systematically analyzed. The internal flow that gas flowed through bubble neck from the smaller part to the larger part was well simulated. Lower redistribution was observed at high gas viscosity due to enhanced viscous flow resistance, at low surface tension and high gas density due to the weaken driving force for internal flow, respectively. And, at high liquid viscosity, the time for cutting-off of bubble neck was longer than the time for internal flow due to decreased bubble rising velocity, finally the mother bubble failed to breakup. The internal flow velocity predicted by numerical simulation were in consistent with calculated value by theoretical model, which greatly validated our theoretical model and emphasized the great significance of internal mechanism. © 2024, The Authors. All rights reserved.

关键词： Density of gases

Effects of Particle Size on the Crystallization Kinetics Characterization for the Preparation of CaO-SiO2 Based Glass -Ceramics, Part 1: In a Simple Crystallization process with Only One Crystal Phase

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SSRN 2024年

作者： Wang, Zhen Xu, Renze State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing100049 China

In-depth discussion of the influencing mechanisms of particle size in the crystal growth of silicate glass has been conducted by calculating the crystallization kinetics parameters based on the exothermic peaks in differential thermal analysis curves. For the as-quenched glass, as particle size changes from 2.5mm to © 2024, The Authors. All rights reserved.

关键词： Particle size