Article
Microbiology
Yan Wu, Wanying Chu, Jiayao Yang, Yudong Xu, Qi Shen, Haoning Yang, Fangxu Xu, Yefei Liu, Ping Lu, Ke Jiang, Hongxin Zhao
Summary: An effective metabolic engineering strategy was implemented in this study to improve 2,3-BD production by increasing the NADH/NAD(+) ratio and blocking competing pathways in E. aerogenes.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Chemistry, Physical
Ke Jiang, Li Li, Shuxin Liu, Yudong Xu, Jiayao Yang, Wanying Chu, Ping Lu, Ting Gao, Ruoxuan Bai, Fangxu Xu, Hongxin Zhao
Summary: In this study, mutants of E. aerogenes were constructed using different strategies to enhance hydrogen production by regulating NADH supply. The hydrogen yields of the mutants IAM1183-E, IAM1183-L, and IAM1183-EL increased by 23.3%, 81.7%, and 97.9%, respectively, compared to the wildtype strain. Overexpression of the pncB gene also led to increased hydrogen yields in the mutants. The strain IAM1183-EL/P exhibited the highest production efficiency with a 58% higher total hydrogen yield than the wildtype. Metabolite analysis revealed that the mutants with nuoE and ldhA gene deletions, combined with pncB overexpression, resulted in a redistribution of metabolic fluxes, leading to improved hydrogen yield.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Balasubramani Ramprakash, Aran Incharoensakdi
Summary: The addition of magnetic nanoparticles (NPs) to the dark fermentative hydrogen production system using pretreated garden wastes as feedstock enhanced biohydrogen production efficiency. Optimal pretreatment conditions of 2% sulfuric acid with sonication (AS) and 2% Viscozyme L with sonication (ES) yielded maximum reducing sugar of 33% and 37% respectively. Supplementation of 30 mg/L magnetic NPs resulted in a 32% and 30% increase in hydrogen production for AS and ES systems compared to the control. The maximum yield achieved was 2.43 mol H2/mol sugar in the optimized system with NPs.
Article
Materials Science, Paper & Wood
Lizhou Ma, Jieming Wang, Rui Zhi, Lucian A. Lucia, Guohui Li, Yu Deng
Summary: This study evaluated the synthesis of 2,3-butanediol using corncob hydrolysate as a carbon source. The results showed that corncob hydrolysate can efficiently produce 2,3-butanediol, indicating its potential for large-scale bioproduction.
Article
Green & Sustainable Science & Technology
Vivek Narisetty, Sudheera Narisetty, Samuel Jacob, Deepak Kumar, Gary A. Leeke, Anuj Kumar Chandel, Vijai Singh, Vimal Chandra Srivastava, Vinod Kumar
Summary: This study evaluated the potential of using sugar beet pulp as a feedstock for 2,3-butanediol (BDO) production. The results showed that using pure arabinose and arabinose-rich hydrolysate from SBP effectively produced BDO under optimized conditions. Additionally, an aqueous two-phase extraction system was able to recover the accumulated BDO efficiently.
Article
Biotechnology & Applied Microbiology
Futa Yatabe, Taisuke Seike, Nobuyuki Okahashi, Jun Ishii, Fumio Matsuda
Summary: This study aimed to enhance the production of ethanol and 2,3-butanediol in S. cerevisiae strains by inducing ATP dissipation through the expression of FBPase and ATPase genes. The results showed increased ethanol and 2,3-butanediol production in the engineered strains, suggesting that ATP wasting may be an effective strategy for improving the fermentative biosynthetic capacity of S. cerevisiae.
MICROBIAL CELL FACTORIES
(2023)
Article
Energy & Fuels
Vanatpornratt Sawasdee, Nunthaphan Vikromvarasiri, Nipon Pisutpaisal
Summary: This study aims to optimize ethanol production from waste glycerol-based by adding acetic acid. It found that the maximum ethanol production was obtained when the co-substrate ratio of Gly:HAc was 100:1. The results suggest that the addition of acetic acid can improve the productivity of ethanol production, but excessive concentration can inhibit glycerol and ethanol utilization.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Green & Sustainable Science & Technology
Farinaz Ebrahimian, Keikhosro Karimi, Irini Angelidaki
Summary: An integrated bioprocessing approach was used to enhance energy recovery from biodegradable municipal solid waste. Clostridium acetobutylicum and Enterobacter aerogenes were cocultivated for coproduction of hydrogen, 2,3-butanediol, and acetone-butanol-ethanol (ABE). The remaining solids were used for biomethane production. The study demonstrated the potential of the integrated fermentation-anaerobic digestion bioprocess for biofuels production from zero-cost substrate.
Article
Biotechnology & Applied Microbiology
Roopa Parate, Mrunal Borgave, Mahesh Dharne, Chandrashekhar Rode
Summary: The study demonstrates the concept of a 'Circular Economy' by converting bioglycerol with a cell-free extract of Enterobacter aerogenes, resulting in the production of 2,3-butanediol. This method not only improves the overall economics of the process, but also effectively utilizes the remaining cell-free extract.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Engineering, Environmental
Yassin Amraoui, Ashish A. Prabhu, Vivek Narisetty, Frederic Coulon, Anuj Kumar Chandel, Nicholas Willoughby, Samuel Jacob, Apostolis Koutinas, Vinod Kumar
Summary: This study is the first attempt to produce BDO from BSG. By optimizing the enzymatic hydrolysis conditions of BSG and employing uncontrolled pH strategy during fermentation, efficient production of BDO was achieved.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Jiubin Zhu, Wenlu Song, Xue Chen, Shaoni Sun
Summary: Different pretreatment methods, including lyophilization, hydrothermal pretreatment, and ultrasound combined with dilute alkali post-cooking, were investigated to enhance the efficiency of enzymatic saccharification and biohydrogen production of wheat straw. All methods effectively removed lignin and hemicellulose while retaining cellulose, improving biomass accessibility. Ultrasound combined with dilute alkali cooking produced a reducing sugar concentration of 13.18 g/L and a sequential fermentative hydrogen yield of 133.6 mL/g total solids.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Green & Sustainable Science & Technology
Sanjay K. S. Patel, Devashish Das, Sun Chang Kim, Byung-Kwan Cho, Vipin Chandra Kalia, Jung-Kul Lee
Summary: The inefficient waste management and associated environmental pollution deplete precious renewable resources and have negative impacts on human health and the global economy. By utilizing microbial anaerobic digestion, organic matter can be metabolized into energy-rich methane and carbon dioxide, producing eco-friendly and biodegradable value-added products. Despite some challenges, integrating different processes for H2 production and waste management could lead to a sustainable economy transition.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Yassin Amraoui, Vivek Narisetty, Frederic Coulon, Deepti Agrawal, Anuj Kumar Chandel, Sofia Maina, Apostolis Koutinas, Vinod Kumar
Summary: This study evaluated a mutant strain of Enterobacter ludwigii for 2,3-butanediol (BDO) production using pure xylose and xylose-rich hydrolysate. Supplementation with yeast extract improved cell growth and BDO production. Batch cultures with pH control and a new separation method achieved high BDO recovery from xylose and hydrolysate.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Microbiology
Yanai Xie, Zhen Ye, Xin Wan, Hua Deng, Weihao Sun, Xun He, Kequan Chen
Summary: In this study, a strain of Enterobacter aerogenes NJ1023 capable of producing extracellular polysaccharides (EPSs) was found. The polysaccharide produced by this strain had a lower molecular weight and a different composition compared to other polysaccharides from the same genus. The EPSs produced by E. aerogenes NJ1023 showed significant protective effects against cadaverine stress in Escherichia coli cells.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Ye-Gi Lee, Jin-Myung Bae, Soo-Jung Kim
Summary: In this study, Saccharomyces cerevisiae was engineered to produce enantiopure meso-2,3-BDO and achieved high productivity using cassava hydrolysates. The researchers also improved the titer and productivity of meso-2,3-BDO by resolving C-2-auxotrophy. These findings have important implications for the commercial production of enantiopure meso-2,3-BDO.
JOURNAL OF BIOTECHNOLOGY
(2022)
Article
Engineering, Environmental
Xiaojian Liu, Bei Wang, Yayun Ma, Xiangyang Zhou, Juan Yang, Yuehui He, Jingjing Tang, Fanyun Su, Wan Yang
Summary: This study proposes a combined process of reduction roasting of herb-medicine residue and oxalic acid leaching to improve the recovery efficiency of lithium from spent lithium-ion batteries. By utilizing the reducing gas produced from the pyrolysis of herb-medicine residue, the layered structure of the cathode powder is destroyed and converted into Li2CO3, Ni, Co, and MnO. Additionally, selective extraction of lithium is achieved using oxalic acid, and the efficiency and kinetics of lithium extraction are improved under the combined action of herb-medicine residue and oxalic acid.
Article
Engineering, Environmental
Muxina Konarova, Nuno Batalha, Gabriel Fraga, Mohamed H. M. Ahmed, Steven Pratt, Bronwyn Laycock
Summary: This study presents a proof of concept for a technology that integrates PET recovery from mixed plastic waste and plastic pyrolysis. By depolymerizing PET into TPA using a low volatility oil as medium, it achieves low-pressure operation and a selective separation and recovery of TPA from the product mix. Full PET conversion and high TPA recovery were achieved, making it an effective solution for processing mixed waste streams and improving the yield and quality of liquid product from thermal pyrolysis compared to untreated feedstock.
Article
Engineering, Environmental
Zhenhua Sun, Jing Li, Xuejiang Wang, Siqing Xia, Jianfu Zhao
Summary: This study investigated the influence of in-situ formed MgFe2O4 on the hydrothermal treatment of swine manure. The results showed that the in-situ formation of MgFe2O4 improved the dehydration and decarboxylation of organic components in swine manure, thereby improving its carbonization degree. Furthermore, it enhanced the stabilization of heavy metals and the retention of phosphorus. MgFe2O4 modified hydrochars exhibited remarkable adsorption capacity for Pb(II) and Cu(II) without any leaching of heavy metals.
Article
Engineering, Environmental
Yijing Jiang, Boyang Leng, Jingxin Xi
Summary: The increased generation of municipal solid waste has had a significant impact on the economy, environment, and public health. The current waste treatment process has limitations. By developing a comprehensive social costing model, this study assesses the impacts of municipal solid waste management throughout its life cycle and provides policymakers with best practices and feasibility information.
Article
Engineering, Environmental
Marina Hernandes de Paula e Silva, Ricardo Coser Mergulha, Jose Geraldo Vidal Vieira, Andrea Brasco Pampanelli, Rodrigo Salvador, Diogo Aparecido Lopes Silva
Summary: This study developed and implemented a self-assessment tool to assist companies in decision-making processes for establishing circular flows based on Lean Manufacturing and Circular Economy principles. The tool utilized a maturity model and was applied to nine companies of varying characteristics. The findings revealed that certain companies showed higher maturity in water-waste and chemical-emissions management, with larger enterprises focusing on these strategies. However, many companies lacked sufficient training and employee awareness prior to seeking cleaner alternatives, and comprehensive actions to manage the product lifecycle were lacking. To address these gaps, the tool provided tailored recommendations for each company to improve their processes, products, and value chain.
Article
Engineering, Environmental
Gamze Dogdu, Turgay Pekdemir, Sanaz Lakestani, Seyda Karabork, Osman Cavus
Summary: This paper presents data on food waste associated with mini size food packaging services, highlighting the difficulties in emptying the food and consumer wastefulness as the main causes. These findings have significant implications for the sustainability of food and relevant packaging.
Article
Engineering, Environmental
Qingxia Li, Xin Kong, Yuxin Chen, Jianan Niu, Jia Jing, Jin Yuan, Yifeng Zhang
Summary: This study investigates how to enhance methane production from food waste after hydrothermal pretreatment. The results demonstrate a significant increase in methane yield when zero-valent iron and magnetite are used together, and high organic loading is favorable for methane production. Microbial diversity analysis further reveals the dominant pathways and metabolic processes involved in methane generation.
Article
Engineering, Environmental
D. H. H. Sim, I. A. W. Tan, L. L. P. Lim, E. T. Lau, B. H. Hameed
Summary: The development of controlled-release fertilizer formulation is important for preventing environmental pollution caused by nutrient leaching and volatilization. This study combined biochar-based fertilizer with encapsulation technology to improve the nutrient release mechanism. Optimal conditions for synthesizing urea-impregnated biochar (UIB) were determined using central composite design, and the release of nitrogen was described by mathematical models. Results showed that encapsulated UIB (EUIB) achieved complete release of nitrogen in water and exhibited improved water retention in sandy-textural soil. Therefore, EUIB derived from peppercorn waste has the potential to be used as a sustainable controlled-release fertilizer for agriculture.
Article
Engineering, Environmental
Yuchuan Wang, Neslihan Akdeniz
Summary: Incorporating biochar into composting systems can increase compost temperatures. This study developed a heat transfer model for a biochar-amended co-composting system and found that biochar increased thermal conductive losses but also enhanced microbial activity, resulting in an overall increase in total heat unit. When biochar was applied on the surface, it mainly functioned as an insulator.
Article
Engineering, Environmental
George Tsalis, Birger Boutrup Jensen, Jessica Aschemann-Witzel
Summary: This paper empirically explores the relationship between retail price promotions and household food waste. The results show that households with a higher proportion of discount food purchases and environmental awareness tend to waste less food, while larger households and those lacking food handling skills tend to waste more food.
Article
Engineering, Environmental
Lukas Friederici, Arne Koch, Patrick Martens, Jana Pantzke, Sebastiano Di Bucchianico, Thorsten Streibel, Christopher P. Rueger, Ralf Zimmermann
Summary: The increasing demand for lightweight materials has led to a rise in fiber-reinforced plastic (FRP) production. However, the properties and compositional range of FRPs pose challenges to recycling strategies. Pyrolysis has emerged as a promising method for separating the fibers from the polymer matrix. This study investigated the pyrolysis process using thermal analysis and high-resolution mass spectrometry, and also assessed the toxicity of the recovered fibers using an in vitro model.
Review
Engineering, Environmental
Devika Kannan, Shakiba Khademolqorani, Nassibeh Janatyan, Somaieh Alavi
Summary: This paper introduces Smart Waste Management (SWM) that applies Industry 4.0 technologies in waste management. A framework called SWM4.0 is developed, which highlights the importance of smart people, smart cities, smart enterprises, and smart factories in achieving successful waste management. The paper also suggests future research directions and managerial implications.