Article
Engineering, Chemical
Yuanxin Fang, Haozhe Cui, Bo Chen, Wanting Chen, Xuehua Ruan, Xuemei Wu, Fujun Cui, Minggang Guo, Gaohong He
Summary: In this study, a kinetics-mass transport model is proposed for the design of CO2 electroreduction reactors. The model can balance the competition between HCOO- production and H2 evolution, and optimize key parameters by considering the cathode potential and CO2 concentration in the flow channel, resulting in high efficiency of CO2 electroreduction.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Environmental Sciences
Magno F. Santos, Antonio E. Bresciani, Newton L. Ferreira, Gabriel S. Bassani, Rita M. B. Alves
Summary: The reverse water gas shift (RWGS) reaction is a promising method for converting carbon dioxide (CO2) and hydrogen (H2) into valuable syngas. This study focuses on modeling and simulating an industrial catalytic reactor for the RWGS reaction. Thermodynamic analysis reveals that the reaction conditions should include a feed molar ratio of 0.8:1 for H2/CO2, a temperature of 750 degrees C, and a pressure of 20 bar. The RWGS process demonstrates a CO2 conversion of 36.26% and a CO selectivity of 96.41% in a multi-tubular fixed bed reactor with a residence time of approximately 2.7 seconds.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Multidisciplinary
Jiazhen Shi, Kai Guo, Zhengchao Wang, Longyun Zheng, Hui Liu, Wenyu Xiang, Chunjiang Liu, Xue Li
Summary: A contraction-expansion guide vane (CEGV) has been proposed and applied to the two-stage internal loop airlift reactor (TSILALR) to suppress liquid back mixing between stages and improve global gas holdup. Computational fluid dynamics (CFD) simulation validates that the CEGV generates local circulation flows at each stage, rather than global circulation flow in the TSILALR.
Article
Engineering, Chemical
Gabi Altabash, Mahmoud Al-Hindi, Fouad Azizi
Summary: This study aimed to enhance the physical absorption of CO2 in water by using a tubular reactor equipped with screen-type static mixers. Four different screen geometries in two reactor designs were tested to investigate their impact on the volumetric mass transfer coefficient, k (L) a, while changing flow rates and gas holdups. Results showed that the limits of intensification were reached and the system became limited by reaction kinetics rather than mass transfer. It was found that the finer meshes provided the highest k (L) a values from a hydrodynamic perspective, while the coarsest woven mesh yielded the best energy utilization efficiency.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Thermodynamics
Jin Wang, Yimin Xuan, Jia Zeng, Qibin Zhu, Zhonghui Zhu
Summary: Proper design of a solar-driven photothermal catalytic reactor is proposed, which enables efficient CO2 reduction into solar fuels. A comprehensive numerical model, considering light harvesting, energy and mass transfer, and chemical conversion processes, is developed to analyze the effectiveness of the reactor and obtain the optimal design strategy. Methods are suggested to enhance the chemical reaction by controlling parameters such as light capture, radiation transfer, temperature field, and reactant supply in the catalyst layer. The designed reactor demonstrates outstanding catalytic performance with remarkable light absorptivity, energy confinement, and reactants enrichment characteristics.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Chemical
Tao Yang, Shujun Geng, Fei Gao, Taobo He, Jingcai Cheng, Qingshan Huang, Chao Yang
Summary: The study systematically investigated the hydrodynamics and mass transfer of a newly invented internal loop airlift slurry reactor under different conditions, proposed empirical models for critical parameters, and discovered an internal fluid relay circulation phenomenon in the riser at high gas velocities. Structural optimization ideas were suggested based on visual observation, picture sequences, and theoretical analysis. The reactor was found to have axial solid concentration deviations, particles inclined to the wall, and consistent particle size distributions throughout, indicating its potential for industrial use with further optimization.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Peyvand Valeh-e-Sheyda, Fatemeh Delpak
Summary: This paper investigates the use of glycerol as a CO2 absorbent in aqueous diethanolamine solution. Experimental results show that glycerol can enhance the CO2 removal percentage and mass transfer performance, contributing to the CO2 capture process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Thermodynamics
Veronique Osswald, Pascal Clain, Laurence Fournaison, Anthony Delahaye
Summary: CO2 hydrate slurries are potential phase change materials for secondary refrigeration, but the difficulty in evaluating their crystallization kinetics hinders their industrial use. This study presents a specific method to determine kinetics by directly measuring heat flow, which is consistent with the evaluation by the mass balance method.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Multidisciplinary
Athanasios A. Tountas, Geoffrey A. Ozin, Mohini M. Sain
Summary: This study introduces a tool for investigating potential catalysts for photochemical and thermal heterogeneous methanol synthesis, with a focus on thermal benchmarking using a commercial CZA catalyst. By improving low-temperature methanol yield and reducing equipment costs, more efficient CO2 utilization can be achieved.
Article
Electrochemistry
Xin Li, Kevin Huang, Noah Van Dam, Xinfang Jin
Summary: This paper presents a simulation of the oxidative coupling of methane (OCM) reaction in a plug-flow CO2/O-2 transport membrane (CTM) reactor. The results show that the CTM reactor exhibits significant improvements in C-2 yield and CH4 conversion rate compared to the conventional co-fed fixed-bed reactor.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Engineering, Chemical
Zongliang Wang, Hongshan Guo, Tong Zhou, Zhenmin Cheng, Zibin Huang
Summary: The influence of three different gas sparger structures on mass transfer efficiency was investigated in a pilot-scale internal loop airlift reactor, and it was found that the perforated plate sparger had the best mass transfer efficiency.
Article
Environmental Sciences
Jingyuan Cui, Hanling Xu, Yafei Cui, Chenyu Song, Yao Qu, Sheng Zhang, Haiping Zhang
Summary: Improving hydrodynamic conditions is an effective method for managing eutrophication, but the specific effects on algal growth are rarely quantified. In this study, a eutrophication model was developed to simulate algae growth dynamics in a drinking water source reservoir in East China, taking into account flow velocity. The model revealed that flow velocity has a significant impact on algal growth and additional sluice operations effectively inhibited excessive algae growth. This research provides valuable insights for eutrophication management in similar water bodies.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Michael O. Schwartz
Summary: Ground basalt, as a mineral fertilizer, has the ability to capture CO2 from the atmosphere, raise soil pH, and reduce ocean acidification. However, its carbon capture capacity will eventually be exhausted over time.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Chiranjit Das, Ravi Kumar Kunchala, Naveen Chandra, Lukasz Chmura, Jaroslaw Necki, Prabir K. Patra
Summary: The influence of El Nino Southern Oscillation on carbon dioxide growth rates is not spatially uniform, with anomalies originating in the tropics and propagating towards the poles with asymmetric delays. This asymmetric time delay is mainly due to CO2 flux anomalies from tropical southern hemisphere land and slower transport of southern hemisphere air into the northern hemisphere.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Giuseppina Oliva, Rekich R. Pahunang, Giovanni Vigliotta, Tiziano Zarra, Florencio C. Ballesteros Jr, Aniello Mariniello, Antonio Buonerba, Vincenzo Belgiorno, Vincenzo Naddeo
Summary: A novel approach utilizing a combination of an activated sludge moving bed bioreactor (MBBR) and an algal photo-bioreactor (PBR) was investigated for the treatment of VOCs, specifically toluene, and the conversion of carbon dioxide into valuable biomass. The MBBR achieved up to 99.9% removal of toluene for a given inlet load. The resulting CO2 was effectively fixed in the PBR with a fixation rate of 95.8%, facilitated by algae and leading to an average production of algal biomass.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Environmental Sciences
Balachandran Ketheesan, David C. Stuckey
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2015)
Article
Agricultural Engineering
Balachandran Ketheesan, Pham Minh Thanh, David C. Stuckey
BIORESOURCE TECHNOLOGY
(2016)
Review
Biotechnology & Applied Microbiology
Pham Minh Thanh, Balachandran Ketheesan, Zhou Yan, David C. Stuckey
BIOTECHNOLOGY ADVANCES
(2016)
Review
Biotechnology & Applied Microbiology
Peter J. Lammers, Michael Huesemann, Wiebke Boeing, Daniel B. Anderson, Robert G. Arnold, Xuemei Bai, Manish Bhole, Yalini Brhanavan, Louis Brown, Jola Brown, Judith K. Brown, Stephen Chisholm, C. Meghan Downes, Scott Fulbright, Yufeng Ge, Jonathan E. Holladay, Balachandran Ketheesan, Avinash Khopkar, Ambica Koushik, Paul Laur, Babetta L. Marrone, John B. Mott, Nagamany Nirmalakhandan, Kimberly L. Ogden, Ronald L. Parsons, Juergen Polle, Randy D. Ryan, Tzachi Samocha, Richard T. Sayre, Mark Seger, Thinesh Selvaratnam, Ruixiu Sui, Alex Thomasson, Adrian Unc, Wayne Van Voorhies, Peter Waller, Yao Yao, Jose A. Olivares
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2017)
Article
Agricultural Engineering
Balachandran Ketheesan, Nagamany Nirmalakhandan
BIORESOURCE TECHNOLOGY
(2012)
Article
Chemistry, Physical
B. Ketheesan, N. Nirmalakhandan
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2011)
Article
Chemistry, Physical
Karnayakage Rasika J. Perera, Balachandran Ketheesan, Yalini Arudchelvam, Nagamany Nirmalakhandan
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2012)
Article
Engineering, Environmental
T. Thinojah, B. Ketheesan, G. B. B. Herath
Article
Water Resources
T. Thinojah, B. Ketheesan
Summary: The study found that GAC is effective in removing iron from synthetic groundwater, with a maximum removal efficiency of 88% and a maximum adsorption capacity of 0.17 mg Fe/g GAC. Column experiments showed that the effluent iron concentration decreased from 0.05 to 0.03 mg/L when the influent iron concentration increased from 1 to 3 mg/L. Reducing the HRT from 7 to 3.5 hours did not significantly affect the iron removal efficiency.
JOURNAL OF WATER AND CLIMATE CHANGE
(2022)
Article
Environmental Sciences
Lithma Ruwangi Kariyawasam Hetti Gamage, Nalina Gnanavelrajah, Balachandran Ketheesan, Kasthuri Kajeevan
Summary: This study found that Chlorella sp. can be cultivated in parboiled rice effluent without nutrient supplements and used as organic fertilizer in combination with organic or inorganic fertilizers. The incubation experiment showed that Chlorella provided similar available nitrogen as inorganic fertilizer, while improving available phosphorus and potassium. The combination treatments of Chlorella resulted in similar or higher pod yield compared to sole inorganic fertilizer.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Engineering, Environmental
Pham Minh Thanh, Balachandran Ketheesan, David C. Stuckey, Yan Zhou
CHEMICAL ENGINEERING JOURNAL
(2017)
Article
Agricultural Engineering
Pham Minh Thanh, Balachandran Ketheesan, Yan Zhou, David C. Stuckey
BIORESOURCE TECHNOLOGY
(2017)
Article
Agricultural Engineering
Pham Minh Thanh, Balachandran Ketheesan, David C. Stuckey, Yan Zhou
BIORESOURCE TECHNOLOGY
(2017)
Article
Agricultural Engineering
Pham Minh Thanh, Balachandran Ketheesan, Zhou Yan, David C. Stuckey
BIORESOURCE TECHNOLOGY
(2017)
Article
Agricultural Engineering
Yinping Xiang, Meiying Jia, Rui Xu, Jialu Xu, Lele He, Haihao Peng, Weimin Sun, Dongbo Wang, Weiping Xiong, Zhaohui Yang
Summary: This study investigated the impact of the non-antibiotic pharmaceutical carbamazepine on antibiotic resistance genes (ARGs) during anaerobic digestion. The results showed that carbamazepine induced the enrichment of ARGs and increased the abundance of bacteria carrying these genes. It also facilitated microbial aggregation and intercellular communication, leading to an increased frequency of ARGs transmission. Moreover, carbamazepine promoted the acquisition of ARGs by pathogens and elevated their overall abundance.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Weixin Zhao, Tianyi Hu, Hao Ma, Dan Li, Qingliang Zhao, Junqiu Jiang, Liangliang Wei
Summary: This review summarizes the effects and potential mechanisms of biochar on microbial behavior in AD systems. The addition of biochar has been found to promote microbial colonization, alleviate stress, provide nutrients, and enhance enzyme activity. Future research directions include targeted design of biochar, in-depth study of microbial mechanisms, and improved models.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Christina Karmann, Anna Magrova, Pavel Jenicek, Jan Bartacek, Vojtech Kouba
Summary: This review assesses nitrogen removal technologies in reject water treatment, highlighting the differences in environmental impacts and economic benefits. Partial nitritation-anammox shows potential for economic benefits and positive environmental outcomes when operated and controlled properly.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Wei-Hao Huang, Ying-Ju Chang, Duu-Jong Lee
Summary: This study modified pinecone biochar with layered double hydroxide (LDH) to enhance its adsorption capacity for heavy metal and phosphate ions. The LDH-biochar showed significantly improved adsorption capacities for Pb2+ and phosphate, and a slight increase for Cu2+ and Co2+. The LDH layer enhanced the adsorption through various mechanisms.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Chao Song, Fanfan Cai, Shuang Yang, Ligong Wang, Guangqing Liu, Chang Chen
Summary: This paper developed a machine learning model to predict the biochemical methane potential during anaerobic digestion. Model analysis identified lignin content, organic loading, and nitrogen content as key attributes for methane production prediction. For feedstocks with high cellulose content, early methane production is lower but can be improved by prolonging digestion time. Moreover, lignin content exceeding a certain value significantly inhibits methane production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sang Min Lee, Ju Young Lee, Ji-Sook Hahn, Seung-Ho Baek
Summary: This study successfully developed an efficient platform strain using Yarrowia lipolytica for the bioconversion of renewable resources into adipic acid, achieving a remarkable increase in production level.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sefkan Kendir, Matthias Franzreb
Summary: This study presents a novel approach using magnetic separation to efficiently harvest freshwater microalgae, Chlorella vulgaris. By combining pH-induced calcium phosphate precipitation with cheap natural magnetite microparticles, harvesting efficiencies up to 98% were achieved in the model medium.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Ishaq Kariim, Ji-Yeon Park, Wajahat Waheed Kazmi, Hulda Swai, In-Gu Lee, Thomas Kivevele
Summary: The impact of reaction temperature, residence time, and ethanol: acetone on the energy compositions and yield enhancement of biocrudes was investigated. The results showed that under appropriate conditions, biocrudes with high energy and low oxygen content can be obtained, indicating a high potential for utilization.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xiyue Zhang, Xiyao Li, Liang Zhang, Yongzhen Peng
Summary: Intermittent aeration is an innovative approach to enhance nitrogen removal in low carbon-to-nitrogen ratio municipal sewage, providing an efficient strategy for the continuous plug-flow AOA process.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xu Yang, Mahmoud Mazarji, Mengtong Li, Aohua Li, Ronghua Li, Zengqiang Zhang, Junting Pan
Summary: This study investigated the impact of magnetite on the nitrogen cycle of pig manure biostabilisation. The addition of magnetite increased N2O emissions and decreased NH3 emissions during composting. It also increased the total nitrogen content but should be considered for its significant increase in N2O emissions in engineering practice.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Ty Shitanaka, Haylee Fujioka, Muzammil Khan, Manpreet Kaur, Zhi-Yan Du, Samir Kumar Khanal
Summary: The market value of microalgae has exponentially increased in the past two decades, thanks to their applications in various industries. However, the supply of high-value microalgal bioproducts is limited due to several factors, and strategies are being explored to overcome these limitations and improve microalgae production, thus increasing the availability of algal-derived bioproducts in the market.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Martin Kerner, Thorsten Wolff, Torsten Brinkmann
Summary: The efficiency of using enriched CO2 from flue gas for large-scale production of green microalgae has been studied. The results show that the use of membrane devices and static mixers can effectively improve the CO2 recovery rate and maintain the suitable pH and temperature during cultivation, achieving a more economical and sustainable microalgae production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rui Ma, Ji Li, Rd Tyagi, Xiaolei Zhang
Summary: This review summarizes the microorganisms capable of using CO2 and CH4 to produce PHAs, illustrating the production process, factors influencing it, and discussing optimization techniques. It identifies the challenges and future prospects for developing economically viable PHAs production using GHGs as a carbon source.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Bing Wang, Peng Zhang, Xu Guo, Xu Bao, Junjie Tian, Guomin Li, Jian Zhang
Summary: The addition of zeolite in the co-composting of chicken manure and straw significantly reduced the emissions of ammonia and N2O, and increased the nitrate content. Zeolite also promoted the abundance of nitrification genes and inhibited the expression of denitrification genes.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rohit Dey, Franziska Ortiz Tena, Song Wang, Josef Martin Messmann, Christian Steinweg, Claudia Thomsen, Clemens Posten, Stefan Leu, Matthias S. Ullrich, Laurenz Thomsen
Summary: This study investigated the operation of a 1000L microalgae-based membrane photobioreactor system for continuous secondary wastewater treatment. The research focused on a green microalgae strain called Desmodesmus sp. The study aimed to understand key trends and optimization strategies by conducting experiments in both summer and winter seasons. The findings showed that maintaining low cell concentrations during periods of light inhibition was beneficial for nutrient uptake rates. Effective strategies for enhancing algae-based wastewater treatment included cell mass recycling and adjusting dilution rates based on light availability.
BIORESOURCE TECHNOLOGY
(2024)
