Article
Environmental Sciences
Yewei Sun, Bob Angelotti, Matt Brooks, Zhi-Wu Wang
Summary: This study used PFRs made of multiple CSTRs in series to cultivate aerobic granules in domestic wastewater. The research showed that the feast/famine condition plays a crucial role in aerobic granulation, and aerobic granulation failed whenever the feast/famine ratio exceeded 0.5.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Zhaohui An, Yewei Sun, Bob Angelotti, Matt Brooks, Zhi-Wu Wang
Summary: The duration ratio of feast-to-famine conditions has a larger impact on the success of aerobic granulation compared to the applied gravity selection pressure. Retrofitting guidance for existing wastewater treatment facilities was provided by deriving a theoretical equation correlating the feast-to-famine ratio to routine bioreactor operating parameters. This study highlights the importance of providing adequate feast and famine conditions for aerobic granulation in continuous flow wastewater treatment facilities.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Ecology
Chloe Warret Rodrigues, James D. Roth
Summary: Resource fluctuation drives animal movement in the Arctic tundra, and the expansion of boreal-forest species raises questions about their coping strategies with winter-resource scarcity. We studied the movements of red foxes and Arctic foxes using telemetry data and found that both species primarily use dispersal as a winter movement tactic, despite its association with high mortality. Red foxes dispersed towards the boreal forest, while Arctic foxes predominantly used sea ice to disperse. The home range sizes of resident red foxes increased in winter, while the home range size of resident Arctic foxes did not change seasonally.
ECOLOGY AND EVOLUTION
(2023)
Article
Environmental Sciences
Zhengwen Li, Qingting Meng, Chunli Wan, Chen Zhang, Xuejun Tan, Xiang Liu
Summary: This study investigates the behavior of microbes in aerobic granular sludge (AGS) under feast/famine conditions. It found that famine conditions promote the aggregation and adhesion of microbes, while feast conditions enhance the stability of the layer. Furthermore, inner core microbes show higher aggregation rate and are more advantageous in the formation of a stable layer during the famine stage.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Sara Cantera, Elisa Rodriguez, Nicolas Santaella Vecchini, Juan Carlos Lopez, Pedro A. Garcia-Encina, Diana Z. Sousa, Raul Munoz
Summary: This study investigated the survival and metabolic mechanisms of methane oxidizing bacteria (MOB) under low methane concentrations. The research found that the activity and energy production of methane oxidation were not lost during starvation periods, and poly-hydroxyalkanoate and nitrification metabolism played important roles in maintaining cell viability of MOB. The genus Methylocystis emerged as a key MOB in environments with diluted and intermittent methane emissions.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Yewei Sun, Alison T. Gomeiz, Benoit Van Aken, Bob Angelotti, Matt Brooks, Zhi-Wu Wang
Summary: Plug flow reactors (PFRs) were used to achieve continuous flow aerobic granulation in domestic wastewater. The morphology and characteristics of the aerobic granular sludge transformed as it passed through the reactor, with filamentous structures developing in the feast zone and disappearing in the famine zone. The lack of a famine zone can lead to loosened granule structure and deteriorated settleability.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
J. R. Almeida, E. Serrano Leon, E. Lara Corona, J. C. Fradinho, A. Oehmen, M. A. M. Reis
Summary: This research evaluates the impact of ammonia on the selection of PHA accumulating PPB and found that the best PHA accumulation performance was obtained with selection under permanent presence of ammonia.
Article
Agricultural Engineering
A. Naresh Kumar, Gi-Beom Kim, Alice Muhorakeye, Sunita Varjani, Sang-Hyoun Kim
Summary: This study investigated biopolymer production using VFA as a carbon source in a sequencing batch reactor through feast and famine strategy. It was found that famine conditions resulted in higher PHB yield, and repeated batch operations showed high acetate utilization. Additionally, feast condition led to high biomass concentration, while famine mode regulated carbon use.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Fabrizio Di Caprio, Giacomo Proietti Tocca, Marco Stoller, Francesca Pagnanelli, Pietro Altimari
Summary: The integration of microalgae production with wastewater treatment can enhance economic and environmental sustainability. The control of bacterial contamination is a major challenge for this strategy. In this study, a strategy to control bacterial contamination by alternating organic substrate availability was proposed. The results showed that bacteria had a higher growth rate than microalgae but lysed more during the famine phase, reducing contamination. Cell-to-cell heterogeneity in carbon storage was crucial in determining cell resistance to lysis.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Zhaohui An, Charles B. Bott, Bob Angelotti, Matt Brooks, Zhi-Wu Wang
Summary: The study explored the use of feast and famine conditions to increase selection pressure to drive aerobic granulation while avoiding substantial sludge washout during startup. Experimental results demonstrated that the microbial sludge selection provided through feast and famine conditions offers a novel startup strategy to better maintain treated water quality.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Nicola Frison, Marco Andreolli, Alice Botturi, Silvia Lampis, Francesco Fatone
Summary: Changing the SRT and adding fermented CPS can increase PHA yields, promote microbial diversity, and enhance the selectivity of PHA-storing biomass under different conditions.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Biotechnology & Applied Microbiology
Feng-Long Sun, You-Wei Cui, Li Jian, Jia-Lin Yao
Summary: This study demonstrates that applying a feast/famine regime in a contact stabilization process can recover soluble organic matters via polyhydroxyalkanoates (PHA) storage. The regulation of sludge retention time (SRT) can enhance the recovery of chemical oxygen demand (COD). The study provides a solution to enhance organic matter recovery from wastewater.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2022)
Article
Environmental Sciences
Francisco Cabrera, Alvaro Torres-Aravena, Fernanda Pinto-Ibieta, Jose Luis Campos, David Jeison
Summary: This study demonstrates a successful production of polyhydroxybutyrate (PHB) by implementing different operating strategies, including online control based on dissolved oxygen level. The results show that operating the reactor with an F/F ratio of 0.6 resulted in higher biomass productivity and PHB content, indicating the importance of effective control strategies in improving performance of feast/famine-based bioreactors.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2021)
Article
Engineering, Chemical
Xinxin Wang, Jiachen Zhao, Jianye Xia, Guan Wang, Ju Chu, Yingping Zhuang
Summary: Insufficient mass transfer and mixing issues in industrial-scale bioreactors often lead to glucose feast/famine cycles for cells, resulting in reduced commercial metrics. Trehalose cycling in Penicillium chrysogenum strain helps maintain a balanced metabolism but competes for ATP with penicillin biosynthesis. Investigating trehalose metabolism under industrially relevant conditions is crucial for penicillin production capacity, as cells lacking this metabolic regulator are more sensitive to industrial conditions and experience metabolic rearrangements.
Article
Biotechnology & Applied Microbiology
Yuan Gao, Magnus overlie Arntzen, Morten Kjos, Lars R. Bakken, Asa Frostegard
Summary: Rhizobia living as microsymbionts inside nodules have stable access to carbon substrates, while surviving as free-living bacteria in soil. Many rhizobia can denitrify and switch to anaerobic respiration under low oxygen tension. The cellular machinery regulating this transition is relatively well known, but more information is needed about the regulation in starved organisms. Rating: 8 out of 10.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2023)
