Article
Materials Science, Multidisciplinary
Patricia Metolina, Tiago Ramos Ribeiro, Roberto Guardani
Summary: This study investigates the reduction process of industrially produced hematite pellets with H-2 to reduce CO2 emissions in the steelmaking industry. The results show that temperature and pellet size have an interactive effect on the reduction rate, while porosity has a negligible effect. It is also found that the change in pellet size is significant at high temperatures and a maximum process operating temperature of 900 degrees C is recommended.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Biotechnology & Applied Microbiology
Aaron Zipperle, Barbara Reischl, Tilman Schmider, Michael Stadlbauer, Ivan Kushkevych, Christian Pruckner, Monika Vitezova, Simon K. -M. R. Rittmann
Summary: The conversion of industrial waste gases containing high levels of synthetic carbon monoxide to methane through biomethanation can achieve efficient methane production, which is of great significance for climate-neutral and sustainable energy production.
FERMENTATION-BASEL
(2021)
Article
Energy & Fuels
Hanxiao Wang, Yunhan Tang, Haiyan Gao, Hao Gao, Quanyu Zhao, Jiawen Li, Fengxue Xin, Wenming Zhang, Min Jiang
Summary: A co-culture system composed of Chlorella sp. and Rhodotorula toruloides was established to improve microbial lipid production. The mixed culture showed higher biomass and lipid production due to the oxygen emission and pH regulation provided by Chlorella sp. Optimal conditions were determined to further enhance biomass and lipid content. Different temperatures in the mixed culture system resulted in changes in fatty acid composition. Molasses showed great potential as a substrate for industrial applications.
Article
Environmental Sciences
A. Saravanan, P. Senthil Kumar, S. Srinivasan, S. Jeevanantham, R. Kamalesh, S. Karishma
Summary: Microbial fuel cell (MFC) is a promising alternative energy system that converts chemical energy into electricity with the help of microorganisms. It consists of electrodes (anode and cathode), catalyst (microorganism), and proton transport/exchange membrane (PEM). MFC's core function is the oxidation of organic substrates and electron transfer, with key factors being microorganisms and electrodes. Besides electricity generation, MFC also finds applications in wastewater treatment, biofuel production, and biosensors.
Article
Biotechnology & Applied Microbiology
Palaya Wutthithien, Aran Incharoensakdi
Summary: This study investigated the co-cultivation of N-2-fixing cyanobacteria and microalgae for improved H-2 production. The results showed that co-culturing Chlorella sp. with F. muscicola TISTR 8215 increased H-2 yield compared to monoculture. Furthermore, co-immobilization of the two microorganisms in agar cubes resulted in a significant increase in maximum H-2 yield and prolonged biohydrogen production.
JOURNAL OF APPLIED PHYCOLOGY
(2022)
Article
Chemistry, Physical
Banu Taskan, Emre Oguz Koroglu, Ergin Taskan
Summary: This study found that low inoculum/substrate ratios in the fermentation process caused excessive accumulation of metabolic products and a significant decrease in pH, resulting in decreased hydrogen production efficiency. Cladophora sp. biomass was proven to be an efficient fermentation feedstock for biohydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Agricultural Engineering
Guang Yang, Jianlong Wang
Summary: The study investigated the co-fermentation of antibiotic fermentation residue (AFR) and fallen leaves to enhance biohydrogen production. Results showed that the optimal mixing ratio of AFR to leaves was 25:75, which significantly increased hydrogen yield. Co-fermentation promoted microbial activity, enriched hydrogen-producing bacteria, and enhanced the expression of hydrogen-producing functional genes, fundamentally responsible for synergistic biohydrogen fermentation.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Physical
Yanan Yin, Jianlong Wang
Summary: This study used PICRUSt to analyze the changes in microbial community functions in a biohydrogen production system, revealing that ionizing radiation pretreatment altered metabolic flux and decreased homoacetogenic gene, leading to increased hydrogen production, but also resulted in reduced carbohydrate metabolism.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Environmental Sciences
Amit Kumar Chaurasia, Prasenjit Mondal
Summary: The study demonstrates the high efficiency of microbial electrolysis cells using electrodeposited cathodes in both treatment of sugar industry wastewater and hydrogen recovery, showcasing the potential for real-time industrial effluent treatment and biohydrogen production near ambient atmospheric conditions.
Article
Agricultural Engineering
K. Dauptain, A. Schneider, M. Noguer, P. Fontanille, R. Escudie, H. Carrere, E. Trably
Summary: This study investigates how the type and storage time of inoculum can affect hydrogen production in Dark Fermentation. For complex substrates, there was no significant difference in hydrogen yields between stored and fresh inocula, indicating the possibility of inoculum storage.
BIORESOURCE TECHNOLOGY
(2021)
Review
Chemistry, Physical
Mohamad Afiq Mohd Asrul, Mohd Farid Atan, Hafizah Abdul Halim Yun, Josephine Chang Hui Lai
Summary: This study reviewed the MEC mathematical model, focusing on the classification, assumptions, improvements, and application research of the model. The research found that modeling studies based on mathematical equations can overcome the limitations of industrial-scale biohydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Yang Chen, Yanan Yin, Jianlong Wang
Summary: The addition of butyric acid can inhibit hydrogen production and decrease substrate utilization rate in dark fermentative hydrogen production system, leading to an increase in the proportion of non-hydrogen-producing bacteria in the microbial community.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Changman Kim, Isaac Wolf, Chang Dou, Lauren Magnusson, Pin-Ching Maness, Katherine J. Chou, Steven Singer, Eric Sundstrom
Summary: The study found that nitrogen sparging at low flow rates increases hydrogen production, but high rates of nitrogen sparging inhibit cell growth and hydrogen production. Additionally, supplementing CO2 to the sparging gas can address the stripping of inorganic carbon and co-optimizing the gas flow rate and CO2 fraction further enhances hydrogen production.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Jiangbo Li, Kai Wang, Shaojie Wang, Haijia Su
Summary: This study developed spatially-ordered layer-by-layer biofilms to enhance the cooperation efficiency between two strains and achieved a significant increase in hydrogen production compared to suspended fermentation and mixed biofilms. By optimizing the mixed ratios of the two strains, the highest hydrogen accumulation was obtained at an inoculation volume ratio of A1:B1 = 1:1. Furthermore, the biofilm system showed stable hydrogen production performance during 5 repeat batches of fermentation.
Article
Agricultural Engineering
Dongle Cheng, Huu Hao Ngo, Wenshan Guo, Soon Woong Chang, Dinh Duc Nguyen, Shicheng Zhang, Shihai Deng, Ding An, Ngoc Bich Hoang
Summary: This review discusses the importance and challenges of microbial electrolysis cell (MEC) systems in biohydrogen production. The paper explores the factors influencing biohydrogen production and proposes new strategies and directions to improve efficiency and reduce costs.
BIORESOURCE TECHNOLOGY
(2022)
Review
Environmental Sciences
Tanushree Paul, Arindam Sinharoy, Divya Baskaran, Kannan Pakshirajan, G. Pugazhenthi, Piet N. L. Lens
Summary: This paper discusses the thermochemical conversion process of converting biomass into bio-oil, focusing on the advantages and detailed information of oleaginous microorganisms as biomass feedstocks, as well as the use of wastewater as their substrate. The different process parameters affecting the HTL technology are also discussed, along with an integrated HTL-based sustainable biorefinery approach for resource recovery.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Joyabrata Mal, Yarlagadda Nancharaiah, Isabelle Bourven, Stephane Simon, Eric D. van Hullebusch, Gilles Guibaud, Piet N. L. Lens
Summary: Simultaneous feeding of cadmium and selenium to anaerobic granular sludge induces compositional changes in the EPS matrix, leading to the formation of Se(0) and CdSe nanoparticles mainly in the LB-EPS fraction.
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Tanushree Paul, Divya Baskaran, Kannan Pakshirajan, G. Pugazhenthi, Ravi Rajamanickam
Summary: In this study, a pure culture of Rhodococcus opacus strain PD630 was used to convert lipid-rich bacterial biomass obtained from refinery wastewater into bio-oil. The removal of organics in the wastewater and lipid accumulation by the bacteria reached 70% and 50% w/w respectively. Optimization of operational parameters using Response Surface Methodology led to a bio-oil yield of 25.53% with a high heating value and low water soluble products. GC-MS analysis revealed a variety of compounds in the bio-oil, while the aqueous phase showed potential for reuse due to nutritional compounds. FTIR spectra indicated the presence of alkanes as the predominant functional group in the bio-oil, which matched well with ASTM standards for bio-fuel applications.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Environmental Sciences
N. Arul Manikandan, Kannan Pakshirajan, G. Pugazhenthi
Summary: This study focused on the techno-economic assessment of PHB production at a large scale from waste carob pods in a closed-loop biorefinery setup. By utilizing carob pods as feedstock, upgrading the bioreactor, and replacing conventional centrifugation with ceramic membrane technology, the pay-out period for PHB production was significantly reduced while increasing the turnover.
Article
Environmental Sciences
Sudha Sahu, Manas Protim Rajbonshi, Nihal Gujre, Manish Kumar Gupta, Rahul G. Shelke, Anamika Ghose, Latha Rangan, Kannan Pakshirajan, Sudip Mitra
Summary: The study evaluated the Cd tolerance and bioremediation potential of four PSB strains, identifying one strain (SM_SS8) with higher resistance to Cd. The experimental results substantiated the bioremediation effect of PSB isolates on Cd-contaminated soil, demonstrating a potential combo benefit of phosphate solubilization along with Cd remediation.
Article
Environmental Sciences
Siddhartha Narayan Borah, Lalit Goswami, Suparna Sen, Deepa Sachan, Hemen Sarma, Milka Montes, Jose R. Peralta-Videa, Kannan Pakshirajan, Mahesh Narayan
Summary: The native strain of Bacillus paramycoides isolated from the leachate of coal mine overburden rocks showed potential in producing selenium nanoparticles through biogenic reduction of selenite, indicating it could be utilized for eco-friendly removal of selenite from contaminated sites. The study reported the first instance of selenite reduction and biosynthesis of SeNPs by B. paramycoides, highlighting its application in environmental remediation.
ENVIRONMENTAL POLLUTION
(2021)
Article
Energy & Fuels
Jasinta Poonam Ekka, P. Muthukumar, Krishnendu Bala, Dipak Kumar Kanaujiya, Kannan Pakshirajan
Summary: The article introduces a mixed-mode forced convection solar cabinet dryer and experimentally studies its drying performance on cluster fig under different air mass flow rates. The most suitable mathematical model for representing the drying behavior is discussed, and quality analyses were carried out for solar and sun-dried cluster fig.
Article
Agricultural Engineering
Dipak Kumar Kanaujiya, Kannan Pakshirajan
Summary: This study investigated the potential of Cellulosimicrobium funkei for degrading dimethyl phthalate (DMP) and diethyl phthalate (DEP). The results showed that in a continuous stirred tank reactor (CSTR), complete degradation of both DMP and DEP was achieved even at high initial concentrations, indicating good tolerance of C. funkei towards biodegradation.
BIORESOURCE TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
S. Arun, Surjith Ramasamy, Kannan Pakshirajan
Summary: A consortium of microalgae, ammonia-oxidizing bacteria, and nitrite-oxidizing bacteria showed high NH4+ removal efficiency at light intensities up to 1500 µmol m(-2) s(-1), but the removal process was affected at light intensities above 1500 µmol m(-2) s(-1). This indicates that the mechanism of ammonium removal is strongly influenced by the daily average light intensity.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
S. Arun, Surjith Ramasamy, Kannan Pakshirajan, G. Pugazhenthi
Summary: The membrane photosynthetic microbial fuel cell (MPMFC) utilizes O2, NO3- and NO2- as cathodic electron acceptors for simultaneous treatment of nitrogen, CO2 and organic carbon. A novel cathodic process with in situ nitritation via microalgal photosynthesis during the light period enables shortcut nitrogen removal (SNR) from ammonium-rich wastewater. The MPMFC achieved a nitrogen removal efficiency of 99 +/- 0.5% and maximum electricity production of 56 +/- 0.1 mA by combining microalgal photosynthesis, nitritation and denitritation in the cathode compartment.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
N. Arul Manikandan, Kannan Pakshirajan, G. Pugazhenthi
Summary: An annular bioreactor (ABR) with wide gap was utilized for PHB production from Ralstonia eutropha, with a maximum concentration of 14.89 g/L achieved under specific operating conditions. The ABR outperformed the conventional stirred-tank bioreactor (STBR) in terms of PHB production due to enhanced oxygen and nutrient mass transfer.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Review
Environmental Sciences
Kakali Priyam Goswami, Kannan Pakshirajan, G. Pugazhenthi
Summary: This article discusses the fabrication of membranes using fly ash, highlighting successful cases of treating wastewater. However, caution should be taken when using these membranes in acidic solutions to prevent leaching of heavy metals.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Biotechnology & Applied Microbiology
Dipak Kumar Kanaujiya, Selvanayaki Sivashanmugam, Kannan Pakshirajan
Summary: This study evaluated the degradation of a mixture of six phthalates using Gordonia sp. The results showed that the degradation efficiency of dimethyl, diethyl, and dibutyl phthalates exceeded 99% even at high initial concentrations. The use of a continuous stirred tank bioreactor resulted in higher degradation efficiency compared to shake flasks. Moreover, the degradation of high molecular weight phthalates was better in the bioreactor.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Biotechnology & Applied Microbiology
Dipak Kumar Kanaujiya, Atharva More, Ajay Kumar Chhantyal, Rama Karn, Kannan Pakshirajan
Summary: This study focused on the biodegradation of dimethyl phthalates (DMP), di-n-butyl phthalates (DBP), and di-n-octyl phthalates (DnOP) by Gordonia sp. The results showed that Gordonia sp. can efficiently degrade DMP and DBP, but has a lower degradation efficiency for DnOP. The phytotoxicity of the degradation products was also assessed, and Gordonia sp. demonstrated its potential in removing the phytotoxicity of DMP and DBP.
Article
Engineering, Environmental
M. Gopi Kiran, Raja Das, Shishir Kumar Behera, Kannan Pakshirajan, Gopal Das
Summary: The study demonstrated that artificial neural networks can efficiently predict the behavior of rotating biological contactors in removing heavy metals and COD under current operational conditions. Hydraulic retention time has a significant influence on heavy metal and COD removal.