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Trade-off-based multi-objective optimisation of a simultaneous saccharification and fermentation process ⁎

IFAC-PapersOnLine 2020年第2期53卷 16884-16889页

作者： Viviane De Buck Mihaela Sbarciog Jan Van Impe BioTeC+ Chemical and Biochemical Process Technology and Control Department of Chemical Engineering KU Leuven Belgium

The demand for sustainable replacements for fossil-based products is steadily increasing, especially now that the effects of climate change are becoming more prominent. Lignocellulose, which is a sustainable and abundant carbon source, is dubbed to be the perfect replacement. Lignocellulose consists of lignin, hemicellulose, and cellulose. During the Simultaneous Saccharification and Fermentation (SSF) of cellulose, the hydrolysis and fermentation of the produced C6-sugars occurs simultaneously in the same vessel. The SSF process has mainly been developed to circumvent inhibitory effect and increase the overall product yield. Although the concept of the SSF process is promising, the applications are still limited. This contribution presents the trade-off-based multi-objective optimisation of an SSF process. Multi-objective optimisation allows for optimising (bio-)process with respect to multiple, and often conflicting, objectives. These optimisation problems do not render a unique optimal solution but instead an infinite set of so-called Pareto-optimal solutions, the Pareto front. From the Pareto front, the decision maker should select one working point. To aid decision makers in this selection process, the application of a novel genetic optimisation algorithm is presented in this contribution, i.e., tDOM, that is capable of filtering solutions using t-domination. This results in a less dense Pareto front that only contains solutions that are of interest for the decision maker. Additionally, by extending the t-domination concept to two subsequent solution populations, a novel problem-relevant stopping criterion is developed, resulting in a significant gain in the required computational time. A comparison to the well known NSGA-II is provided.

关键词： process modelling Multi-objective optimisation Simultaneous saccharification fermentation Bioprocesses Trade-off t-domination

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Comparative studies on fouling of homogeneous anion exchange membranes by different structured organics in electrodialysis

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Journal of Environmental Sciences 2019年第3期31卷 218-228页

作者： Zhijuan Zhao Shaoyuan Shi Hongbin Cao Yujiao Li Bart Van der Bruggen Division of Environment Technology and Engineering CAS key Laboratory of Green Process and Engineering Beijing Research Center of Process Pollution Control State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Chemical Engineering KU Leuven Zhengzhou Institute of Emerging Industrial Technology Faculty of Engineering and the Built Environment Tshwane University of Technology

Five negatively charged organic compounds with different structures, sodium methane sulfonate(MS), sodium benzene sulfonate(BS), sodium 6-hydroxynaphthalene-2-sulfonate(NSS), sodium dodecyl sulfate(SDS), and sodium dodecyl benzene sulfonate(SDBS), were used to examine the fouling of an anion exchange membrane(AEM) in electrodialysis(ED),to explore the effect of molecular characteristics on the fouling behavior on the AEM and changes in the surface and electrochemical properties of the AEM. Results indicated that the fouling degree of the AEM by the different organics followed the order:SDBS > SDS > NSS > BS > MS. SDBS and SDS formed a dense fouling layer on the surface of the AEM, which was the main factor in the much more severe membrane fouling, and completely restricted the transmembrane ion migration. The other three organics caused fouling of the AEM by adsorption on the surface and/or accumulation in the interlayer of the AEM, and exhibited almost no influence on the transmembrane ion migration. It was also concluded that the organics with benzene rings caused more severe fouling of the AEM due to the stronger affinity interaction and steric effect between the organics and the AEM compared with organics with aliphatic chains.

关键词： Anion exchange membrane Different structural organics Membrane fouling Property characterization Fouling mechanism analyses

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Ptfe Enhances In Situ Electro-Generation of H2o2 On Graphite Felt Cathode to Synchronously Degrade Cr(Vi) And Methyl Orange in the Flow-Through System

SSRN

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SSRN 2024年

作者： Li, Li Zhang, Xinwan Shi, Yaqi Yang, Zhengwu Yin, Di Chen, Peng Zhang, Lehua National Engineering Laboratory for Industrial Wastewater Treatment East China University of Science and Technology Shanghai200237 China Department of Materials Science and Engineering City University of Hong Kong Kowloon999077 Hong Kong School of Biology Food and Environment Hefei University Hefei230601 China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology Shanghai200237 China

The co-existence of toxic hexavalent chromium [Cr(VI)] and synthetic organic dyes in dyeing effluents is a prevalent issue, while the simultaneous removal of these co-contaminants remains a great challenge. Electrocatalytic reduction of oxygen to hydrogen peroxide (H2O2) as reductant in the flow-through systems by achieving efficient generation and utilization of active sites is a promising strategy for Cr(VI) reducing detoxification, and electro-generated H2O2 can simultaneously degrade organic contaminants via hydroxyl radicals (•OH). Herein, we demonstrated a microfluidic-based flow-through electro-Fenton-like system with modified graphite felt (GF) electrode by constructing a gas diffusion micro-channel to generate H2O2 in situ and simultaneously degrade Cr(VI) and methyl orange (MO). This synergistic removal system promoted the degradation of Cr(VI) and MO compared to those in individual contaminant systems (Cr(VI) reduction reached 99.9%, while MO removal efficiency reached 99% simultaneously). Simulation study indicated that the increased number of accessible active sites and its induced nanoscale convection in flow-through system accelerated the nanoscale interfacial mass transfer at PTFE-electrode-solution. Moreover, active species monitoring and the quantum chemical calculation were applied to explore the synergistic mechanism and detailed pathway on the degradation of co-existing contaminants. This work demonstrated the feasibility of simultaneously converting heavy metals and organic dyes, holding a great promise to removal multiple contaminants in complex wastewater. © 2024, The Authors. All rights reserved.

关键词： Azo dyes

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GPP Estimation of a Grassland Ecosystem Based on Photosynthesis-Hydrology Coordination Optimization

GPP Estimation of a Grassland Ecosystem Based on Photosynthe...

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Chinese Automation Congress (CAC)

作者： Lijiang Fu Jinglu Tan Yongnian Jiang Suleyman I. Allakhverdiev Zhenyu Xu Ya Guo Key Laboratory of Advanced Process Control for Light Industry Ministry of Education Jiangnan University Wuxi China Department of Chemical & Biomedical Engineering University of Missouri Columbia Missouri USA Jiangsu Zhongnong IoT Technology Co. LTD Yixing China Timiryazev Institute of Plant Physiology RAS Moscow Russia Longcom Internet of Things Co. Ltd Hefei China

ISBN: (数字)9798350368604

ISBN: (纸本)9798350368611

Accurate estimation of gross primary production (GPP, ecosystem level photosynthesis) is critical for monitoring terrestrial ecosystems. However, most of the current models used for GPP estimation are with many unknown parameters and rarely include the effects of soil water stress due to the covariation of soil moisture and air humidity. In addition, grasslands, as the most widely distributed ecosystems in the world, have simple ecosystem structure and are easily affected by soil drought. Therefore, in this paper, we applied photosynthesis-hydrology coordination optimization theory and soil water potential based on soil moisture effect to develop a combined model (PH model) for GPP estimation of grassland ecosystems and used the US-Var grassland ecosystem, one of the FLUXNET sites from January to July 2004 (the driest period in recent years) as an example to validate the model. The results show that the model can effectively track the measured GPP during soil drought period and is better than the result from another commonly used photosynthesis coordination model (Pmodel) which does not consider the effect of soil drought. Further, we can infer the vegetation photosynthetic capacity parameters including the maximum carboxylation capacity (V cmax) and the maximum electron-transport capacity (Jmax) under the effect of soil drought. The result also shows that if soil drought is not considered, the photosynthetic capacity parameters of vegetation will be overestimated. These results provide evidence for the application of photosynthesis-hydrology coordination theory in the assessment of ecosystem carbon cycle under the intensified climate changes.

关键词： Grasslands Soil measurements Biological system modeling Atmospheric modeling Droughts Soil moisture Estimation Vegetation Optimization Stress

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Reconfigurable metasurface based on plasma cylinders

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Physical Review Research 2025年第1期7卷 013287-013287页

作者： Jiaruo Yan Ioannis Katsantonis Ioannis Draganidis Konstantinos Kourtzanidis Alessio Monti Stefano Vellucci Mirko Barbuto Filiberto Bilotti Maria Kafesaki Institute of Electronic Structure and Laser Foundation for Research and Technology-Hellas (FORTH) Crete 70013 Heraklion Greece Department of Materials Science and Engineering University of Crete Crete 70013 Heraklion Greece Chemical Process and Energy Resources Institute Centre for Research and Technology Hellas (CERTH) 6th km Charilaou-Thermi Thermi 57001 Thessaloniki Greece Department of Industrial Electronic and Mechanical Engineering Roma Tre University Via Vito Volterra 62 00146 Rome Italy Department of Engineering Niccolò Cusano University Via don Carlo Gnocchi 3 00166 Rome Italy Metamorphose-VI 1348 Louvain-la-Neuve Belgium

Dynamically reconfigurable metasurfaces, offering real-time wavefront control, promise the realization of unprecedented components for the future information and communication technologies. The current reconfiguration approaches, though, suffer from certain inefficiencies, such as small tunability range and depth, slow response, complex implementation, etc. Plasma discharges promise to face some of those inefficiencies, as they exhibit a wide tunable range of electric permittivity, via simple control of the plasma source in the implementation. Here, exploiting these unique tunability properties of plasma, we design and numerically demonstrate dynamically reconfigurable metasurfaces formed as arrays of plasma cylinders. Analytical results for single-cylinder scattering properties provide initial guidelines for the realization of a generalized Kerker condition below the plasma frequency of the plasma cylinder, where both the electric dipole and quadrupole moments are excited and balanced, and Huygens response for the cylinders array is expected. This is verified by numerical investigation of arrays of identical cylinders, demonstrating tunable high transmission and a wide phase coverage. Based on those results, a phase gradient metasurface made of tunable plasma cylinders is designed, optimized, and demonstrated. The analysis is extended to practically realizable coated plasma cylinders, where both frequency tunability and dynamically controllable beam steering capabilities are demonstrated.

关键词： Electric dipole moments

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Data driven modelling of the beer aging Formation and release of beer staling aldehydes 11

Data driven modelling of the beer aging Formation and releas...

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11th International Conference on Simulation and Modelling in the Food and Bio-Industry, FOODSIM 2020

作者： Munoz, Carlos Andre Trueba, Paula Bustillo Jaskula-Goiris, Barbara De Cooman, Luc Van Impe, Jan KU Leuven Department of Chemical Engineering BioTeC+ Chemical and Biochemical Process Technology and Control Gebroeders De Smetstraat Ghent9000 Belgium Gebroeders De Smetstraat Ghent9000 Belgium

ISBN: (纸本)9789492859136

The avour of beer and its stability in time is inuenced by the presence of staling aldehydes. Understanding the conditions that inuence the formation and release of aldehydes during the beer production and storage is crucial to determine the conditions that can favour lower concentrations of aldehydes in the final beer, resulting in better avour stability. Modelling this phenomenon based on process conditions and properties of the product at different stages (i.e., malting and brewing) offers a tool for quality prediction and opens the possibility for process optimization. In this contribution, experimental data obtained from the beer production and aging is used to build regression models that capture those correlations relevant to describe the beer avour stability. The main focus is on investigating and modelling the relations between 3 stages in the beer production, i.e., processed malt (M), fresh beer (FB) and 90 days aged beer (AB). The data driven regression models presented in this contribution are based on Partial Least Squares (PLS) for which feature selection was applied. These models were validated for the estimation of the total aldehydes (TA) in malt, the classification of fresh and aged beer as well as the prediction of the Overall Aging Score (OAS), and the estimation of the concentration of different aldehydes markers in the aged beer. © 2020 EUROSIS. All Rights Reserved.

关键词： Beer

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chemical looping based ammonia production--A promising pathway for production of the noncarbon fuel

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Science Bulletin 2022年第20期67卷 2124-2138,M0004页

作者： Qinghua Lai Tianyi Cai Shik Chi Edman Tsang Xia Chen Runping Ye Zhenghe Xu Morris D.Argyle Dong Ding Yongmei Chen Jianji Wang Armistead G.Russell Ye Wu Jian Liu Maohong Fan College of Engineering and Applied Science University of WyomingLaramie WY 82071USA School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Wolfson Catalysis Department of ChemistryUniversity of OxfordOxford Ox13QRUK College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Chemical and Materials Engineering University of AlbertaEdmonton Alberta T6G1H9Canada Department of Chemical Engineering Brigham Young UniversityProvo UT 84602USA Idaho National Laboratory Idaho Falls ID83415USA College of Chemistry Beijing University of Chemical TechnologyBejing 100029China School of Chemistry and Environmental Science Henan Normal UniversityXinxiang 453007China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlanta GA 30332USA MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Power EngineeringNanjing University of Science&TechnologyNanjing 210094China DICP-Surrey Joint Centre for Future Materials Department of Chemical and Process Engineeringand Advanced Technology InstituteUniversity of SurreyGuilford Surrey GU27XH UK

Ammonia, primarily made with Haber-Bosch process developed in 1909 and winning two Nobel prizes, is a promising noncarbon fuel for preventing global warming of 1.5 °C above pre-industrial levels. However,the undesired characteristics of the process, including high carbon footprint, necessitate alternative ammonia synthesis methods, and among them is chemical looping ammonia production(CLAP) that uses nitrogen carrier materials and operates at atmospheric pressure with high product selectivity and energy efficiency. To date, neither a systematic review nor a perspective in nitrogen carriers and CLAP has been reported in the critical area. Thus, this work not only assesses the previous results of CLAP but also provides perspectives towards the future of CLAP. It classifies, characterizes, and holistically analyzes the fundamentally different CLAP pathways and discusses the ways of further improving the CLAP performance with the assistance of plasma technology and artificial intelligence(AI).

关键词： Ammonia synthesis chemical looping Nitrogen carrier Renewable fuels Energy carrier

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A new sulfur bioconversion process development for energy- and space-efficient secondary wastewater treatment

arXiv

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arXiv 2023年

作者： Jiang, Chu-Kuan Deng, Yang-Fan Guo, Hongxiao Chen, Guang-Hao Wu, Di Department of Civil and Environmental Engineering Water Technology Centre Hong Kong Branch of Chinese National Engineering Research Centre for Control & Treatment of Heavy Metal Pollution The Hong Kong University of Science and Technology Hong Kong Wastewater Treatment Laboratory Fok Ying Tung Graduate School The Hong Kong University of Science and Technology Guangzhou China Centre for Environment and Energy Research Ghent University Global Campus Incheon Korea Republic of Department of Green Chemistry and Technology Ghent University Centre for Advanced Process Technology for Urban Resource Recovery Ghent Belgium Centre for Environment and Energy Research Ghent University Global Campus Korea Republic of Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Hong Kong

Harvesting organic matter from wastewater is widely applied to maximize energy recovery via biogas production from anaerobic digestion or power generation from incineration;however, it limits the applicability of secondary treatment for acceptable effluent discharge into surface water bodies. To turn this bottleneck issue into an opportunity, this study developed oxygen-induced thiosulfatE production duRing sulfATe reductiOn (EARTO) to provide efficient electron donor for wastewater treatment. Typical pretreated wastewater was synthesized with chemical oxygen demand of 110 mg/L, sulfate of 50 mg S/L, and varying dissolved oxygen (DO) and was fed into a moving-bed biofilm reactor (MBBR). The MBBR was operated continuously with a short hydraulic retention time of 40 min for 349 days. The formation rate of thiosulfate reached 0.12–0.18 g S/(m2·d) with a high thiosulfate-Sproduced/TdSSproduced ratio of 38–73% when influent DO was 2.7–3.6 mg/L. The sludge yield was 0.23–0.29 gVSS/gCOD, much lower than it in conventional activated sludge processes. Then, batch tests and metabolism analysis were conducted to confirm the oxygen effect on thiosulfate formation, to characterize the roles of sulfate and microbial activities, and to explore the mechanism of oxygen-induced thiosulfate formation in ERATO. Results examined that oxygen supply promoted the thiosulfate-Sproduced/TdS-Sproduced ratio from 4% to 24–26%, demonstrated that sulfate and microbial activities were critical for thiosulfate production, and indicated that oxygen induces thiosulfate formation through two pathways: 1) direct sulfide oxidation (S2- + O2 → S2O32-), and 2) indirect sulfide oxidation, sulfide is first oidized to S0 (dominant) which then reacts with sulfite derived from oxygen-regulated biological sulfate reduction (S0 + SO32- → S2O32-). The proposed compact ERATO process, featuring high thiosulfate production and low sludge production, supporting space- and energy-efficient secondary wastewater treatm

关键词： Wastewater treatment

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Data-Driven Distributionally Robust Mixed-Integer control through Lifted control Policy

arXiv

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arXiv 2025年

作者： Ma, Xutao Ning, Chao Du, Wenli Shi, Yang Department of Automation Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China the Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education East China University of Science and Technology Shanghai200237 China the Department of Mechanical Engineering University of Victoria VictoriaBCV8W 3P6 Canada

This paper investigates the finite-horizon distributionally robust mixed-integer control (DRMIC) of uncertain linear systems. However, deriving an optimal causal feedback control policy to this DRMIC problem is computationally formidable for most ambiguity sets. To address the computational challenge, we propose a novel distributionally robust lifted control policy (DR-LCP) method to derive a high-quality approximate solution to this DRMIC problem for a rich class of Wasserstein metric-based ambiguity sets, including the Wasserstein ambiguity set and its variants. In theory, we analyze the asymptotic performance and establish a tight non-asymptotic bound of the proposed method. In numerical experiments, the proposed DR-LCP method empirically demonstrates superior performance compared with existing methods in the literature. © 2025, CC BY.

关键词： Mixed-integer linear programming

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Effect of the number of Cyperus rotundus and medium height on the performance of batch-constructed wetland in treating aquaculture effluent

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Chemosphere 2024年 353卷 141595页

作者： Imron, Muhammad Fauzul Hestianingsi, Wa Ode Ayu Putranto, Trisnadi Widyaleksono Catur Citrasari, Nita Abdullah, Siti Rozaimah Sheikh Hasan, Hassimi Abu Kurniawan, Setyo Budi Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Campus C UNAIR Jalan Mulyorejo Surabaya60115 Indonesia Department of Water Management Faculty of Civil Engineering and Geosciences Delft University of Technology Stevinweg 1 CN Delft 2628 Netherlands Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Bangi Selangor 43600 Malaysia Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Bangi Selangor 43600 Malaysia Laboratory of Algal Biotechnology Centre Algatech Institute of Microbiology of the Czech Academy of Sciences Opatovický mlýn Novohradská 237 Třeboň379 81 Czech Republic

Increasing aquaculture cultivation produces large quantities of wastewater. If not handled properly, it can have negative impacts on the environment. Constructed wetlands (CWs) are one of the phytoremediation methods that can be applied to treat aquaculture effluent. This research was aimed at determining the performance of Cyperus rotundus in removing COD, BOD, TSS, turbidity, ammonia, nitrate, nitrite, and phosphate from the batch CW system. Treatment was carried out for 30 days with variations in the number of plants (10, 15, and 20) and variations in media height (10, 12, and 14 cm). The result showed that aquaculture effluent contains high levels of organic compounds and nutrients, and C. rotundus can grow and thrive in 100% of aquaculture effluent. Besides that, the use of C. rotundus in CWs with the effect of numbers of plants and media height showed performance of COD, BOD, TSS, turbidity, ammonia, nitrate, nitrite, and phosphate with 70, 79, 90, 96, 64, 82, 92, and 48% of removal efficacy, respectively. There was no negative impact observed on C. rotundus growth after exposure to aquaculture effluent, as indicated by the increase in wet weight, dry weight, and growth rate when compared to the control. Thus, adding aquaculture effluent to CWs planted with C. rotundus supports the growth and development of plants while also performing phytoremediation. © 2024 Elsevier Ltd

关键词： Wetlands

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