Article
Chemistry, Physical
Veronica L. Martinez, Gabriel L. Salierno, Rodrigo E. Garcia, Maria Jose Lavorante, Miguel A. Galvagno, Miryan C. Cassanello
Summary: In this study, a model was developed to estimate the lag phase time, hydrogen production efficiency, and kinetics in dark fermentation. The model relied on growing bacteria in defined culture media, monitoring the pH, and using the acid-base species mass balance. The results showed that the pH curve could accurately predict the amount of produced hydrogen and estimate the parameters of the modified Gompertz model.
Article
Engineering, Environmental
Nor Habsah Md Sabiani, Husnul Azan Tajarudin, Wan Azlina Wan Ab Karim Ghani, Azni Idris, Azhari Samsu Baharuddin
Summary: This study evaluated the anaerobic digestion process of sonicated food waste using different kinetic models, with the Monod model proving to be the most suitable for understanding the system's kinetic parameters.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Endong Miao, Xufan Zheng, Zhuo Xiong, Yongchun Zhao, Junying Zhang
Summary: This study systematically investigated the direct aqueous mineral carbonation of carbide slag under various conditions. A novel kinetic model based on the Two-Film Theory was proposed and showed excellent agreement with experimental data. Carbonation efficiencies of over 90% were achieved in all experiments. The rate-controlling step of the reaction changed from gas-liquid mass transfer initially to solid-liquid mass transfer at later stages. Changes in the mineralogy and morphology of the carbide slag confirmed the reaction mechanism, and the effect of operating parameters on gas-liquid mass transfer was quantitatively investigated. This study contributes to the large-scale, rational utilization of energy and optimization of CO2 mineral carbonation in gas-liquid-solid reaction systems.
Article
Engineering, Chemical
Leone Mazzeo, Antonella Signorini, Giuseppe Lembo, Irene Bavasso, Luca Di Palma, Vincenzo Piemonte
Summary: In this study, a novel configuration of BM digester, the Gas Stirred Tank Reactor (GSTR) filled with random packing, was modeled to explore the working principle of in situ Bio-Methanation. The research found that the mass transfer coefficient is the limiting step of the process, as indicated by a dimensionless analysis involving Stanton (St) and beta numbers.
Article
Chemistry, Applied
Daniel Francis, A. John Blacker, Nikil Kapur, Stephen P. Marsden
Summary: The new modular photochemical continuous stirred-tank reactor (CSTR) design utilizes light-source units developed for the fReactor CSTR platform, making it suitable for both homogeneous and multiphasic reactions. By using slurries as input feeds, the system intensifies photochemical brominations, and its modular nature facilitates the integration of downstream reaction steps.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2022)
Article
Engineering, Environmental
A. Danican, A. Darrehmane, T. Chateau, Z. Trad, J. -P Fontaine, Ch. Vial
Summary: A modified optical trajectography technique was developed to study the hydrodynamic features of mass transfer enhancement in dark fermentation. The results showed that operating in the transition region between laminar and turbulent flow improved the efficiency of dark fermentation. Using multiple particles as tracers reduced the measurement time effectively.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Sonam Tiwari, Pranjal Tripathi, Devendra Mohan, R. S. Singh
Summary: This study isolated potential bacteria for the biodegradation of imidacloprid and found that the optimal degradation conditions are pH 7, temperature of 35°C, and shaking speed of 150 rpm. The bacterial consortium achieved 78% degradation in batch studies and 90% degradation in the reactor. Kinetics analysis showed that the Teisser model best fit the experimental data, with a correlation coefficient (R2) of 0.98. Ecotoxicological assessment revealed decreased luminescence inhibition and cytotoxicity after bacterial treatment.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
Zhenqi Sun, Jialin Tan, Guangping Zhou, Hao Huang, Shaoqu Xie
Summary: This study proposed a method of separating biofuel isobutanol from fermentation broth using sugaring-out and dilution. By reducing the water content, the formation of an isobutanol-water azeotrope was broken. The isobutanol was purified to high concentration using a sugaring-out and salting-out process.
Article
Computer Science, Artificial Intelligence
Gongming Wang, Qing-Shan Jia, Junfei Qiao, Jing Bi, MengChu Zhou
Summary: This work introduces a deep learning-based model predictive control (DeepMPC) for modeling and controlling a continuous stirred-tank reactor (CSTR) system. DeepMPC achieves high performance in system identification and control through automatic determination of size and quadratic optimization.
IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS
(2021)
Article
Green & Sustainable Science & Technology
Hao Jiang, Wenchuan Hao, Yeqing Li, Hongjun Zhou
Summary: Biological methanation process is beneficial for upgrading anaerobic digestion, efficient utilization of surplus electricity and H-2, energy storage and peak regulation, as well as CO2 emission reduction. Continuous stirred tank reactor (CSTR) is an economical and convenient method for methanation. The study found that the reactor could run stably at a pH around 8.5, and CO2 flow was adjusted for pH control. Different stages of the process showed significant succession in the microbial community.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Chemical
J. N. Delbridge, T. A. Barrett, A. Ducci, M. Micheletti
Summary: This study investigated the microcarrier suspension performance and flow fields in a scale-down mimic of Allegro STR single-use bioreactor range compared to a standard cylindrical configuration. It was found that the down-pumping mode in the A-STR achieved homogeneous suspension at a considerably lower power input compared to other configurations. Flow structures at the just-suspended condition were similar to those in the turbulent regime. Baffles significantly reduced the power input required for suspension, except for the A-STR (DP) configuration.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Mathematics, Applied
Shi Liu, Song Chen, Tehuan Chen, Zhigang Ren
Summary: This paper proposes a residual neural network-based observer for CSTR systems, which can quickly and accurately observe the state changes during the CSTR reaction.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Environmental Sciences
Zineb Guellout, Emilie Francois-Lopez, Yacine Benguerba, Christine Dumas, Krishna Kumar Yadav, Ahmed M. Fallatah, Arivalagan Pugazhendhi, Barbara Ernst
Summary: This study utilized grape residues to generate fermentative hydrogen, establishing mathematical models to represent hydrogen generation and other fermentation products, substrate consumption, and bacterial growth. The optimal biomass load of 60 g COD/L with specific concentrations provided the best hydrogen yield.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Isabella Pecorini, Elena Rossi, Simone Becarelli, Francesco Baldi, Simona Di Gregorio, Renato Iannelli
Summary: Dark fermentation is a simple method for hydrogen production using various organic wastes as feedstock. This study optimized the methane yield by reducing the hydraulic retention time in a two-stage reactor system. Functional inference and microbial community analysis were conducted to understand the changes in each reactor stage. The results showed an overall increase in biogas production and improvement in gas quality.
Article
Engineering, Environmental
S. S. Hoseini, G. Najafi, B. Ghobadian, A. H. Akbarzadeh
Summary: This study investigates the importance of mixing in the chemical industry and proposes a computational framework for optimizing power consumption and impeller stress in stirred-tank reactors. By using Computational Fluid Dynamic (CFD) analysis, the study examines three types of impellers and utilizes Multi-objective Genetic Algorithm (MOGA) to optimize the geometrical parameters of the blades. The results show a decrease in power consumption with V- and U-shape impellers compared to the 6-blade Rushton turbine, and indicate differences in turbulent kinetic energy and stress distribution among different impeller designs.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Electrochemistry
Shobana Raghunath, Abhijeet Prasad, Rahul Tevatia, Jillian. R. Gunther, Santanu Roy, Sunil Krishnan, Ravi F. Saraf
Article
Electrochemistry
Santanu Roy, Abhijeet Prasad, Rahul Tevatia, Ravi F. Saraf
ELECTROCHEMISTRY COMMUNICATIONS
(2018)
Article
Multidisciplinary Sciences
Rahul Tevatia, George A. Oyler
Article
Multidisciplinary Sciences
James W. Allen, Rahul Tevatia, Yasar Demirel, Concetta C. DiRusso, Paul N. Black
Article
Chemistry, Analytical
Rahul Tevatia, Abhijeet Prasad, Ravi F. Saraf
ANALYTICAL CHEMISTRY
(2019)
Article
Biotechnology & Applied Microbiology
Rahul Tevatia, Sophie Payne, James Allen, Derrick White, Thomas E. Clemente, Heriberto Cerutti, Yasar Demirel, Paul Blum
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2019)
Article
Microbiology
Jessica A. Slade, Mary Brockett, Raghuveer Singh, George W. Liechti, Anthony T. Maurelli
Article
Immunology
Raghuveer Singh, George Liechti, Jessica A. Slade, Anthony T. Maurelli
INFECTION AND IMMUNITY
(2020)
Article
Chemistry, Multidisciplinary
Jay Min Lim, Rahul Tevatia, Ravi F. Saraf
Summary: This study found that small nucleic acids have a significant impact on the limit of quantification in qPCR analysis, primarily due to the length of the PCR product. Therefore, it is crucial to consider the size of the nucleic acids and the length of the PCR product during primer design for qPCR.
Article
Environmental Sciences
Seyedeh Parvin Moussavi, Abudukeremu Kadier, Raghuveer Singh, Razieh Ashoori, Maryam Shirinkar, Jun Lu, Nur Syamimi Zaidi, Farooq Sher
Summary: This study develops an innovative and self-regenerative process based on a low-cost calf bone char (CBC) for the removal of humic acid (HA). The CBC showed high adsorption capacity and could remove 92.1-100% of HA. This process provides a cost-effective and sustainable water pre-treatment method.
Article
Chemistry, Physical
Abudukeremu Kadier, Raghuveer Singh, Dongsheng Song, Farshid Ghanbari, Nur Syamimi Zaidi, Putu Teta Prihartini Aryanti, Dipak A. Jadhav, M. Amirul Islam, Mohd Sahaid Kalil, Walid Nabgan, Aidil Abdul Hamid, Hassimi Abu Hasan, Peng-Cheng Ma
Summary: Due to the global efforts toward decarbonization, the microbial electrolysis cell (MEC) has gained attention as a clean hydrogen producing technology. However, the sustainability, scalability, and application costs of MEC have raised concerns due to its external energy requirement. This research aimed to enhance MEC's performance in treating palm oil mill effluent (POME) by integrating a pico-hydro-power generator (PHP). The novel PHP-MEC system showed superior performance in terms of hydrogen production, organics removal, and energy efficiency compared to previous MEC studies.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Environmental Sciences
Amina Othmani, Abudukeremu Kadier, Raghuveer Singh, Chinenye Adaobi Igwegbe, Mohamed Bouzid, Md Osim Aquatar, Waheed Ahmad Khanday, Million Ebba Bote, Fouad Damiri, Omur Gokkus, Farooq Sher
Summary: This paper provides a comprehensive review of the literature on electrocoagulation (EC) fundamentals, reactor design, process implementation, current challenges, and performance enhancement through coupling EC with important pollutant degradation processes (DPs). The results suggest that optimizing treatment time, current density, pulse frequency, shaking speed, and spaced electrode can improve the efficiency of pollutant removal. Coupling EC with other DPs can further enhance the removal efficiency of organic pollutants and heavy metals.
ENVIRONMENTAL RESEARCH
(2022)
Article
Immunology
Raghuveer Singh, Jessica A. Slade, Mary Brockett, Daniel Mendez, George W. Liechti, Anthony T. Maurelli
Summary: The study demonstrates the functionality of DapF in Chlamydia trachomatis through a substrate competition strategy, showing that excess substrate can inhibit specific enzyme activities. The findings suggest that suppressing either the glutamate racemase or epimerase activity of DapF compromises the growth of the bacterium.
INFECTION AND IMMUNITY
(2021)
