Article
Biotechnology & Applied Microbiology
Miao Yang, Kun-Peng Xie, Chi Ma, Si-Hui Yu, Jing-Yi Ma, Ze-Quan Yu, Xi Chen, Zheng Gong
Summary: This study successfully utilized the green microalga Chlorella sorokiniana for partial nitrification coupled with anammox (PN/A) process to remove nitrogen from low C/N wastewater. The results showed that with optimal light and photoperiod adjustment, the PN/A process achieved efficient nitrogen removal.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Eliana C. Guarda, Eunice Costa, Catia Gil, Catarina L. Amorim, Claudia F. Galinha, Anouk F. Duque, Paula M. L. Castro, Maria A. M. Reis
Summary: Traditional tools for controlling and monitoring biological systems are often offline and time-consuming, leading to ineffective and delayed responses. This study evaluated the feasibility of using two-dimensional fluorescence spectroscopy as a real-time and non-destructive procedure to monitor acidogenic fermentation in a granular sludge reactor. The results showed that fluorescence spectroscopy combined with mathematical analysis could accurately predict fermentation products and soluble protein concentrations in the effluent.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Environmental Sciences
Rodrigo B. Carneiro, Gisele M. Gomes, Marcelo Zaiat, Alvaro J. Santos-Neto
Summary: This study investigates the impact of phase separation on the performance of anaerobic digestion (AD) by operating different configurations of anaerobic fixed bed biofilm reactors. The results show that feeding the effluent stream from the acidogenic reactor to the methanogenic reactor improves system start-up, alkalinity generation, and biomethane production. The COD removal kinetics is also enhanced in the sequential two-phase system. Hydrogenotrophic methanogenesis is the predominant pathway in the methanogenic reactor, while the Methanosaeta-driven acetoclastic pathway predominates in the acidogenic reactor. The higher diversity of bacteria and archaea in the methanogenic reactor indicates a better balance between volatile organic acid degradation and methane generation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Biochemistry & Molecular Biology
Agnieszka A. Pilarska, Anna Marzec-Grzadziel, Emil Paluch, Krzysztof Pilarski, Agnieszka Wolna-Maruwka, Adrianna Kubiak, Tomasz Kaluza, Tomasz Kulupa
Summary: This study conducted anaerobic digestion on confectionery waste using granular polylactide (PLA) as a cell carrier. The results showed that PLA significantly enhanced bacterial proliferation without affecting microbiome biodiversity. The addition of PLA also promoted the growth of biofilm surface area.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Environmental Sciences
Jianghao Huang, Yu Pan, Li Liu, Jinsong Liang, Linyu Wu, Hongtao Zhu, Panyue Zhang
Summary: This study investigated the effects and mechanisms of salinity on the production of short-chain fatty acids (SCFAs) in the anaerobic fermentation of kitchen wastewater. The results showed that high salinity conditions accelerated the release of soluble proteins and inhibited the hydrolysis and degradation of proteins and carbohydrates. High salinity delayed the production of n-butyric acid but did not change the composition of total SCFAs. It also enriched certain bacterial genera and showed negative correlation with the relative abundance of bacteria responsible for SCFA production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agricultural Engineering
Joerg Steinbrenner, Anastasia Oskina, Joachim Mueller, Hans Oechsner
Summary: The aim of this study was to develop an automated technical-scale leach bed reactor system for VFA production and successfully suppress methane formation using pH-controlled flushing mode.
BIORESOURCE TECHNOLOGY
(2022)
Review
Environmental Sciences
A. H. Jagaba, S. R. M. Kutty, I. M. Lawal, S. Abubakar, I. Hassan, I. Zubairu, I. Umaru, A. S. Abdurrasheed, A. A. Adam, A. A. S. Ghaleb, N. M. Y. Almahbashi, B. N. S. Al-dhawi, A. Noor
Summary: The article discusses the serious environmental threat posed by landfill leachate and emphasizes the importance and efficiency of the SBR system in leachate treatment. The article analyzes the pros and cons of different treatment methods, providing guidance for future research.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Microbiology
Simon Mills, Anna Christine Trego, Piet N. L. Lens, Umer Zeeshan Ijaz, Gavin Collins
Summary: This study investigated the microbial ecology of granule formation in high-rate, up-flow anaerobic bioreactors and proposed an ecological granulation model. By analyzing the microbial communities actively undergoing growth, breakage, and reformation within the granules, important ecological roles influencing granule formation and stability were identified, leading to the development of a stepwise ecological model for granulation.
MICROBIOLOGY SPECTRUM
(2021)
Article
Biotechnology & Applied Microbiology
Huiliang Liu, Fei Wang, Zhi Wang, Di Wu, Tao Xing, Xiaoying Kong, Yongming Sun
Summary: The influence of pH and temperature on the acidogenic fermentation performance of fruit and vegetable waste was investigated through batch experiments, and the effects of hydraulic retention time (HRT) on performance and microbial community in semi-continuous fermentation were also studied. Alkaline fermentation was found to be more favorable for higher product yield, with acetic acid, propionic acid, and butyric acid as the main products. Different HRTs affected the daily production and composition of products, but did not change the dominant bacterial species. This study provides a theoretical basis and guidance for enhancing product yield and optimizing formation of product.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Environmental Sciences
C. Vidal-Antich, M. Peces, N. Perez-Esteban, J. Mata-Alvarez, J. Dosta, S. Astals
Summary: The study investigated the impact of food waste composition on co-fermentation performance; protein-rich components resulted in the highest VFA yields; a positive interaction on VFA yield was observed when mixing a protein-rich and a carbohydrate-rich component.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Agricultural Engineering
Min Ni, Yang Pan, Dapeng Li, Yong Huang, Zhiqiang Chen, Lu Li, Zuowei Song, Yimeng Zhao
Summary: This study assessed the impact of operating conditions of a biofilm sequencing batch reactor (BSBR) on the community structure and metabolic pathways of polyphosphate-accumulating organisms (PAOs). The findings suggest significant differences compared to the enhanced biological phosphorus removal (EBPR) process. The PAOs in BSBR have various metabolic pathways to ensure efficient energy circulation and show distinct differences from the classic mechanism based on Candidatus_Accumulibacter and Tetrasphaera.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Luisa Niero, Fernando Morgan-Sagastume, Anders Lagerkvist
Summary: The study demonstrated the impact of temperature, pH, and retention time on the acidogenic fermentation of sewage sludge with wood fly ash added. Higher temperatures and adjusted pH favored hydrolysis, while fermentation producing organic acids was faster at lower temperatures.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Mahboubeh Namdarimonfared, Hamid Zilouei, Hadiseh Tondro
Summary: This study assessed the feasibility of continuous hydrogen production in an anaerobic packed bed biofilm reactor (APBR) using paper mill effluent (PME) without any pretreatment or modification. The highest hydrogen concentration achieved was 41.5% at a hydraulic retention time (HRT) of 4 hours. The system showed potential for high hydrogen production rates and yields under different HRTs.
Review
Engineering, Environmental
Hosseini Koupaie, A. A. Bazyar Lakeh, A. Azizi, H. Hafez, E. Elbeshbishy
Summary: The research investigated the impact of two process configurations integrating two-phase anaerobic digestion of municipal sludge with thermal hydrolysis. The results showed that positioning thermal hydrolysis before acidogenic fermentation resulted in higher COD solubilization ratio and volatile fatty acids production. The sequential thermal hydrolysis/fermentation process achieved higher methane yield. However, the formation of refractory intermediates during the thermal process reduced the overall performance rate of the anaerobic digestion process, which could be mitigated by acidogenic fermentation of thermally-processed sludge.
Article
Engineering, Environmental
Lisheng Wang, Xiaofeng Kang, Yanchen Liu, Xia Huang
Summary: Stable partial nitrification was achieved in MABR using control strategies based on free ammonia (FA) and free nitrous acid (FNA), with low FA concentrations suppressing nitrite oxidizing bacteria (NOB) and FNA stabilizing partial nitrification by eliminating NOB.
Article
Engineering, Environmental
Mohanakrishna Gunda, Sanath Kondaveeti, L. Krishna Bharat, Jeevan Kumar Reddy Modigunta, Ibrahim M. Abu-Reesh, Riyadh I. Al-Raoush
Summary: Adapting MFC to a magnetic field and applying a short term electric potential enhanced its performance in power generation and organic reduction in food waste leachate. The best results were achieved with a magnetic field at 220 mT and an electric potential at 500 mV.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Energy & Fuels
Subhash G.V., Sivapirakasam S.P., Phanindra K. Harisivasri
Summary: The present experimental investigation focuses on improving the properties of biomixture fuel samples by using a novel additive such as 1-butyl-1-methylpyrrolidinium chloride (ionic liquid). SWME-4 and SWME-5 are identified as optimal blends and meet the standard limits of BIS, ASTM, and EN testing methods. The addition of an ionic additive and increasing the percentage of WCME in the fuel blends significantly increased the overall saturated fatty acids content.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Review
Environmental Sciences
Poonam Choudhary, Venkata G. Subhash, Monika Khade, Sandip Savant, Amar Musale, Raja Krishna G. Kumar, Meenakshi Sundaram Chelliah, Santanu Dasgupta
Summary: The oceans play a vital role in addressing the global food-water-energy nexus and are key to sustainable environment and economy. However, the blue economy, which includes sectors such as shipping, tourism, fisheries and marine biotechnology, is still undervalued and requires more attention and scientific understanding. The current study provides a systematic comparative assessment of different sectors within the blue economy, highlighting the challenges and strategies that need to be explored and implemented for industrial deployment.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Agricultural Engineering
G. V. Subhash, S. P. Sivapirakasam, Sreejith Mohan, K. Harisivasri Phanindra
Summary: The experimental study focused on enhancing the characteristics and properties of bio-mix test fuel samples by using an additive like n-butanol. Result showed that the blends BSBW4 and BSBW5 exhibited lower acid value and were selected as optimum blends. Adding n-butanol additive improved oxidation stability, cetane number, saturated fatty acid methyl ester, and cold flow properties of the fuel samples.
BIOMASS & BIOENERGY
(2021)
Article
Agricultural Engineering
G. Venkata Subhash, Meghna Rajvanshi, G. Raja Krishna Kumar, Uma Shankar Sagaram, Venkatesh Prasad, Sridharan Govindachary, Santanu Dasgupta
Summary: The article provides a detailed overview of the challenges in microalgae production processes for bioenergy purposes, with supporting technoeconomic assessments related to microalgae cultivation, harvesting, and downstream processes required for crude oil or biofuel production. Additionally, biorefinery approaches that can valorize the by-products or co-products in microalgae production and enhance the techno-economics of the production process are discussed.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
C. Nagendranatha Reddy, Sanath Kondaveeti, Gunda Mohanakrishna, Booki Min
Summary: Anaerobic digestion is a potential bioconversion process for treating organic wastes and generating green energy, but it has limitations that can be overcome by bioelectrochemical systems to improve energy recovery efficiency.
Article
Agriculture, Dairy & Animal Science
A. G. Waghmare, N. Chugh, U. S. Sagaram, S. Arun, D. Menon, G. Venkata Subhash, V. Nagle, T. Dattaroy, S. Dasgupta
Summary: This study evaluated the nutritional and safety parameters of microalgal biomass over a period of 12 months. The results showed that the physical properties, proximate composition, and safety of the microalgal biomass remained stable during storage under different conditions. This suggests that microalgae can be stored for extended periods without compromising its quality.
ANIMAL FEED SCIENCE AND TECHNOLOGY
(2022)
Article
Agricultural Engineering
Gunda Mohanakrishna, Annie Modestra
Summary: Bioenergy production from lignocellulosic biomass (LCB) is an important topic for meeting energy demand, addressing climate change and waste management. Hydrothermal pretreatment is gaining popularity for organics recovery from LCB and can lead to the production of biohydrogen and biomethane. Integration approaches and utilization of solid residue obtained from LCB pretreatment were also discussed. The importance of hydrothermal pretreatment as a suitable strategy for LCB utilization and its future potential in large-scale energy recovery were emphasized.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
C. Femina Carolin, P. Senthil Kumar, Gunda Mohanakrishna, R. V. Hemavathy, Gayathri Rangasamy, Tejraj M. Aminabhavi
Summary: Globally, the increase in human population has led to the rise of various industries, resulting in the production of various types of wastes. Industrial pollutants have become a major concern due to their harmful effects on human and environmental health. Effective waste management is in high demand to handle the increasing amount of waste generated. This review explores the utilization of industrial waste in the production of sustainable biosurfactants and discusses their categorization. It also emphasizes waste management and its implications for the bioeconomy, offering recent scientific literature and highlighting research needs in this area.
Review
Energy & Fuels
Sanath Kondaveeti, Dhivakar Govindarajan, Gunda Mohanakrishna, Dayakar Thatikayala, Ibrahim M. Abu-Reesh, Booki Min, Indumati M. Nambi, Riyadh I. Al-Raoush, Tejraj M. Aminabhavi
Summary: Petroleum industries generate large amounts of wastewater containing high concentrations of recalcitrant pollutants. Bioelectrochemical systems (BESs) have been widely used to treat these wastewaters while simultaneously generating bioelectricity and value-added chemicals. This review discusses the applications of BESs in the treatment of petroleum wastewater and compares them with other biological processes.
Review
Environmental Sciences
K. Sivagami, Pranshu Sharma, Ansaf Karim, Gunda Mohanakrishna, S. Karthika, G. Divyapriya, R. Saravanathamizhan, A. Naresh Kumar
Summary: Electrochemical methods are superior in treating recalcitrant water borne pollutants due to their high efficiency and treatment rate. Electro-oxidation (EO) is a recent development that completely mineralizes non-biodegradable organic matter and eliminates some inorganic species, making it a robust and versatile technology. The treatment efficiency is determined by electrode materials, electrolyte concentration, pH, and current density applied in electrochemical processes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
A. Saravanan, P. Senthil Kumar, Michael Badawi, Gunda Mohanakrishna, Tejraj M. Aminabhavi
Summary: The consumption of petroleum products causing global warming has led to the search for alternative and eco-friendly energy sources. Algae are viewed as versatile feedstock materials for sustainable power sources and green biorefinery. This review provides extensive details of the sustainable process of microalgae biomass in biorefinery applications, including pre-treatment strategies, bioconversion into biofuel, and metabolic engineering methodologies. The article also examines the techno-economic analysis, sustainability, challenges, and future perspectives in algal biofuel development and pretreatment process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Deepanshi Rajput, Anshu Baldia, Akshay Kumar, Vinod Kumar, Gunda Mohanakrishna, Kashyap Kumar Dubey
Summary: Nitrogen is crucial for life and food production, but the loss of unused nitrogen in wastewater, air, freshwater, and oceans has led to nitrogen pollution, impacting the environment and causing eutrophication, climate change, biodiversity loss, and ozone depletion. It also affects human health by causing cardio respiratory issues. Anthropogenic activities like food processing, fertilizer production, and mining have disrupted the global nitrogen cycle. Autotrophic ammonia-oxidizing microbial communities, such as AOA, AOB, and AnAOB, are widely used to remove nitrogen. New strategies, such as Anammox, Feammox, and Comammox, are being developed to reduce carbon footprint and improve nitrogen removal efficiency. This review explores the applications of autotrophic ammonia oxidizers in agriculture, wastewater treatment plants, and engineered ecosystems, as well as the stress impacts on these organisms.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Manisha Sharma, Deepanshi Rajput, Vinod Kumar, Indu Jatain, Tejraj M. Aminabhavi, Gunda Mohanakrishna, Ravi Kumar, Kashyap Kumar Dubey
Summary: Excessive usage and unrestricted discharge of antibiotics in the environment lead to their accumulation in the ecosystem. Photodegradation of four commonly consumed antibiotics was studied using Cu2O-TiO2 nanotubes. The cytotoxicity of the transformed products was evaluated on cell lines.
ENVIRONMENTAL RESEARCH
(2023)
Review
Green & Sustainable Science & Technology
Prakash Kumar Sarangi, Vivekanand Vivekanand, Gunda Mohanakrishna, Bhabjit Pattnaik, Uday M. Muddapur, Tejraj M. Aminabhavi
Summary: The massive utilization of fossil resources for synthetic chemical production is causing environmental issues. A circular sustainable bioeconomy model can address these problems by utilizing renewable resources such as agricultural waste biomass. Agricultural waste presents a promising source for sustainable chemicals and fuels. The review focuses on the reclamation of phenolics from agricultural residues and highlights sustainable extraction technologies.
JOURNAL OF CLEANER PRODUCTION
(2023)
