Article
Environmental Sciences
Alice Muhorakeye, Roent Dune Cayetano, Naresh Kumar, Jungsu Park, Ashutosh Kumar Pandey, Sang-Hyoun Kim
Summary: Polyhydroxybutyrate (PHB), a natural polyester, was synthesized using volatile fatty acids (VFAs) as a substrate. Optimization tests were conducted to improve the biodegradability and hydrolysis of waste activated sludge. The results showed that SDBS pretreatment and pH adjustment during continuous acidogenesis yielded stable VFA conversion and high PHB production.
Article
Agricultural Engineering
A. Serra-Toro, S. Vinardell, S. Astals, S. Madurga, J. Llorens, J. Mata-Alvarez, F. Mas, J. Dosta
Summary: A gas-permeable membrane (GPM) contactor is a suitable technology to efficiently separate ammoniacal nitrogen and volatile fatty acids (VFA) from fermentation broths under different pH and temperature conditions.
BIORESOURCE TECHNOLOGY
(2022)
Review
Green & Sustainable Science & Technology
Zeinab Qazanfarzadeh, Abirami Ramu Ganesan, Loredana Mariniello, Lorenza Conterno, Vignesh Kumaravel
Summary: The accumulation of petroleum-based plastics necessitates the search for biodegradable packaging materials. Brewer's spent grain, a by-product of beer production in Europe, has potential value in the food packaging sector due to its high biomaterial content and large annual generation. This study comprehensively examines the extraction of high-value products from brewer's spent grain using various biorefinery techniques and evaluates the potential of biodegradable films and coatings derived from brewer's spent grain for food packaging. Techno-economic factors, environmental impacts, and challenges are also assessed. The best biorefinery system requires a balance between extraction efficiency, energy consumption, environmental impact, upscaling feasibility, and operating cost. Cellulose, lignin, xylitol, and arabinoxylan are recommended as promising components for food packaging applications.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Agricultural Engineering
J. Santhosh, Omprakash Sarkar, S. Venkata Mohan
Summary: This study evaluated the production of bioH2 and biomethane from food waste at varying organic loads, aiming to form biogenic hydrogen-enriched compressed natural gas. The results show that the composition and energy output of bioH2 and biomethane vary significantly under different organic load conditions.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Lucia Argiz, Angeles Val Del Rio, David Correa-Galeote, Belen Rodelas, Anuska Mosquera-Corral
Summary: Combining substrate hydrolysis, culture enrichment, and storage in a single reactor helps simplify the production process of TAGs and PHAs. The carbon influx during the feast phase is a key parameter in controlling storage compound production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
U. Jayakrishnan, Deepmoni Deka, Gopal Das
Summary: PHA is considered as the ideal substitute for non-biodegradable plastics derived from petroleum, but its large-scale implementation is restricted due to production costs. By utilizing waste feedstocks and activated sludge as inoculum in a three-step methodology, an affordable production strategy was developed to improve PHA accumulation through acidogenic fermentation and aerobic dynamic feeding strategy. This approach has the potential to integrate PHA production into existing waste treatment facilities and lead to more comprehensive market applications with improved efficiency and polymer properties.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Qian Zeng, Feixiang Zan, Tianwei Hao, Samir Kumar Khanal, Guanghao Chen
Summary: Research on shifting biogas to VFA production for higher economic gains has led to the discovery that electrochemical pretreatment (EPT) can efficiently produce VFA during anaerobic sludge digestion, reducing the dependence on chemicals.
Article
Environmental Sciences
Ai Zhang, Jinling He, Yuye Shen, Xianbao Xu, Yanan Liu, Yongmei Li, Shimin Wu, Gang Xue, Xiang Li, Jacek Makinia
Summary: The co-fermentation of waste activated sludge and chicken manure significantly enhances the degradation of glucocorticoids, increases sludge reduction, and improves volatile fatty acid production. Even with a high glucocorticoid content, there is no impact on sludge hydrolysis and acidification. Mixing waste activated sludge with animal manure can reduce the toxicity of glucocorticoids and promote waste reduction and volatile fatty acid production.
ENVIRONMENTAL RESEARCH
(2021)
Article
Environmental Sciences
Jing Zhou, Dapeng Li, Xuemeng Zhang, Chao Liu, Yinguang Chen
Summary: Energy shortages pose significant challenges to the growing population and rapid urbanization. The effective utilization of high-value products derived from protein-rich waste has emerged as an excellent solution to mitigate the energy crisis. However, traditional disposal methods have proven to be ineffective, resulting in environmental issues. This paper provides an overview of the valorization of protein-rich waste and explores various approaches for effective resource utilization.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Kuan-Ting Lee, Yi-Tse Shih, Saravanan Rajendran, Young -Kwon Park, Wei-Hsin Chen
Summary: This study aims to maximize lipids retained in thermally degraded spent coffee grounds (SCGs) to upgrade their fuel quality. Torrefaction can retain 11-15 wt% lipids from SCG, with lipid content decreasing at temperatures above 300 degrees C. The produced biochar, with a high lipid content, can act as an oil adsorbent and potential solid fuel.
ENVIRONMENTAL POLLUTION
(2023)
Review
Biotechnology & Applied Microbiology
Anthony T. Giduthuri, Birgitte K. Ahring
Summary: Volatile fatty acids (VFA) are intermediate products in anaerobic digestion (AD) that can be converted into biogas. Arrested AD (AAD) suppresses the conversion of VFA into biogas, making VFA the main product. However, commercialization of AAD has been hindered by low VFA titers and lack of cost-effective separation methods. This review discusses techniques used in rewiring AD to AAD and recent developments for increasing VFA production and separation, highlighting the importance of VFA production in sustainable jet fuel production.
FERMENTATION-BASEL
(2023)
Review
Environmental Sciences
Juliana Belen Rial, Maria Lujan Ferreira
Summary: Water pollution is increasing due to the growth of human population and industrial activities. Adsorption technology is widely used for pollutant removal, but the generation of spent materials limits its scalability. The reutilization of exhausted adsorbents is feasible and environmentally friendly, with potential applications in effluent treatments, heavy metal removal, and water hardness reduction.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Jin Li, Wenzhuo Xin, Jiahao Liang, Pengyin Shang, Yanke Song, Qinghong Wang, Mohamed Gamal El-Din, Muhammad Arslan, Shaohui Guo, Chunmao Chen
Summary: Volatile fatty acids (VFA) produced from waste activated sludge (WAS) have the potential for resource recovery in wastewater treatment plants. This study shows that adding refinery spent caustic (RSC) during alkaline fermentation of refinery WAS (RWAS) can enhance VFA production. The enrichment of certain bacteria, as well as increased activity of protease and alpha-glucosidase, contributes to the increased VFA yield. Additionally, the presence of sulfate and free ammonia in RSC likely promotes acetic acid production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Valentina Kafkova, Robert Kubinec, Jozef Mikulec, Miroslav Variny, Petra Ondrejickova, Ales Haz, Adriana Brisudova
Summary: With the increasing consumption of coffee beverages, a large amount of food waste-spent coffee grounds (SCG)-is generated. SCG is highly polluting due to the presence of caffeine, tannins, and polyphenols. However, it contains 15% oil on average, making it suitable for biodiesel production.
Article
Green & Sustainable Science & Technology
L. Bartek, I. Strid, K. Henryson, S. Junne, S. Rasi, M. Eriksson
Summary: The study evaluated the environmental impact of DHA produced by heterotrophic algae fed with short-chain carboxylic acids from food waste fermentation, showing that algae oil has lower environmental impact and higher sustainability potential compared to fish oil.
SUSTAINABLE PRODUCTION AND CONSUMPTION
(2021)
Article
Agricultural Engineering
M. Venkateswar Reddy, Yasuteru Mawatari, Yuka Yajima, Kohki Satoh, S. Venkata Mohan, Young-Cheol Chang
BIORESOURCE TECHNOLOGY
(2016)
Article
Green & Sustainable Science & Technology
Motakatla Venkateswar Reddy, Satoru Hayashi, Dubok Choi, Hoon Cho, Young-Cheol Chang
JOURNAL OF CLEANER PRODUCTION
(2018)
Article
Chemistry, Physical
M. Venkateswar Reddy, S. Venkata Mohan, Young-Cheol Chang
SUSTAINABLE ENERGY & FUELS
(2018)
Article
Biotechnology & Applied Microbiology
Motakatla Venkateswar Reddy, Ahmed ElMekawy, Deepak Pant
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2018)
Review
Agricultural Engineering
M. Venkateswar Reddy, Gopalakrishnan Kumar, Gunda Mohanakrishna, Sutha Shobana, Riyadh Al-Raoush
BIORESOURCE TECHNOLOGY
(2020)
Article
Biotechnology & Applied Microbiology
M. Venkateswar Reddy, Alexander Steinbuechel
Summary: This study demonstrated that the putative tctC genes from V. paradoxus TBEA6 can be heterologously expressed in E. coli, and protein-ligand interactions were monitored using thermoshift assays. One of the tctC genes (VPARA-44430) was found to be involved in the uptake of TDP.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2021)
Review
Energy & Fuels
Gayathri Priya Iragavarapu, Syed Shahed Imam, Omprakash Sarkar, Srinivasula Venkata Mohan, Young-Cheol Chang, Motakatla Venkateswar Reddy, Sang-Hyoun Kim, Naresh Kumar Amradi
Summary: To meet the growing energy needs and address the depletion of fossil resources, there is a need to shift from fossil-based feedstocks to organic waste for a competitive, resource-efficient, and low-carbon sustainable economy. Chemical routes for fuel and chemical production have low production costs, but the use of toxic and expensive catalysts make the process unsustainable. Utilizing renewable resources for bioprocessing with a multi-product approach improves resource utilization and contributes to the green economy.
Article
Biotechnology & Applied Microbiology
Kyo Saito, M. Venkateswar Reddy, Omprakash Sarkar, A. Naresh Kumar, DuBok Choi, Young-Cheol Chang
Summary: This study focused on the production of non-available homopolymer P(3HV) and commercially available copolymer P(3HB-co-3HV) through fermentation using different bacterial strains. A fast and inexpensive method using HPLC was developed to quantify the polymers. The results obtained by this method were compared with GC analysis.
BIOENGINEERING-BASEL
(2023)
Article
Biotechnology & Applied Microbiology
Young-Cheol Chang, Motakatla Venkateswar Reddy, Kazuma Imura, Rui Onodera, Natsumi Kamada, Yuki Sano
Summary: The study demonstrated the feasibility of using cheese whey containing low lactose for PHA production, and a two-stage process could enhance PHA yield.
BIOENGINEERING-BASEL
(2021)
Article
Chemistry, Physical
M. Venkateswar Reddy, Young-Cheol Chang
Summary: Anaerobic bacteria were used to convert apple waste and pumpkin waste into medium-chain fatty acids through chain elongation, resulting in the production of significant amounts of SCFA and MCFA. The biohydrogen generated constituted the highest proportion of the biogas composition.
SUSTAINABLE ENERGY & FUELS
(2021)
Article
Chemistry, Multidisciplinary
Young-Cheol Chang, M. Venkateswar Reddy, DuBok Choi
Summary: The study utilized the bacterium Cupriavidus sp. CY-1 to degrade toxic VOCs and produce biodegradable plastic, PHB. Results demonstrated that CY-1 efficiently degraded TCE and cDCE, converting them into PHB.
Article
Engineering, Environmental
Young-Cheol Chang, M. Venkateswar Reddy, Honoka Umemoto, Sonomi Kondo, DuBok Choi
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2020)
Article
Biotechnology & Applied Microbiology
M. Venkateswar Reddy, Yuka Yajima, Dubok Choi, Young-Cheol Chang
BIOTECHNOLOGY AND BIOPROCESS ENGINEERING
(2017)
Article
Agricultural Engineering
M. Venkateswar Reddy, Yasuteru Mawatari, Rui Onodera, Yuki Nakamura, Yuka Yajima, Young-Cheol Chang
BIORESOURCE TECHNOLOGY
(2017)
Article
Biochemistry & Molecular Biology
M. Venkateswar Reddy, S. Venkata Mohan, Young-Cheol Chang
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2018)
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)
