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Bi W, Butardo V, Sha G, Zhang H, Wu X, Wang L. Microbial degradation and pollutant control in aerobic composting and anaerobic digestion of organic wastes: A review. WASTE MANAGEMENT (NEW YORK, N.Y.) 2025; 204:114894. [PMID: 40408805 DOI: 10.1016/j.wasman.2025.114894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2025] [Revised: 04/21/2025] [Accepted: 05/14/2025] [Indexed: 05/25/2025]
Abstract
Aerobic composting (AC) and anaerobic digestion (AD) are promising technologies for organic waste treatment, but their efficiency and safety are influenced by complex waste composition and persistent contaminants. This review identifies the advances in understanding microbial community dynamics, enzymatic degradation pathways, and the fate of contaminants during AC and AD processes. The findings indicate that substrate composition shapes dominant microbial populations and their degradative enzymes, with this correlation potentially useful for predicting functional microbial communities. Additionally, AC shows advantages in antibiotic elimination while AD excels in heavy metal immobilization, with both contributing to removing certain antibiotic resistance genes (ARGs). The strategic manipulation of environmental conditions, particularly temperature and oxygen levels, can drive microbial succession to optimize organic matter decomposition while minimizing ARG proliferation. Economic analyses reveal that AC offers lower operational costs and AD generates valuable by-products with potential energy recovery from organic waste. Case studies indicate that integrating both technologies can overcome individual limitations and enhance degradation efficiency compared to conventional single-technology approaches. This work proposes a comprehensive framework for developing coupled AC-AD systems to achieve more efficient and safer organic waste valorization than conventional single-technology approaches. This review has important implications for advancing sustainable waste management practices and mitigating the spread of antibiotic resistance in the environment.
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Affiliation(s)
- Wenhui Bi
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China; Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia; College of Food Science and Engineering, Shandong Agriculture and Engineering University, Jinan, Shandong 250100, China
| | - Vito Butardo
- Department of Chemistry and Biotechnology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia
| | - Guomeng Sha
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Hong Zhang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Xiuyun Wu
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Lushan Wang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China.
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Han Y, Yin M, Zhang Q, Tian L, Wu H, Song Y, He X. Fe 2O 3@D201 Enhanced Efficiency of Food Waste Degradation by Microbial Inoculum Under Aerobic Condition. Curr Microbiol 2025; 82:224. [PMID: 40172644 DOI: 10.1007/s00284-025-04215-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Accepted: 03/22/2025] [Indexed: 04/04/2025]
Abstract
The global quantity of food waste (FW) is increasing at an alarming rate, making safe disposal a pressing issue in urban management. The inappropriate disposal of FW will put risks on health and environment. Aerobic degradation equipment has emerged as a promising solution for FW disposal by adding microbial agents. However, current equipment faces challenges such as long processing duration and low efficiency. Therefore, we investigated the impact of combining microbial agents with iron oxide nano-resin (Fe2O3@D201) on the aerobic degradation of FW. We conducted experiments using 10% microbial agents supplemented with 6% Fe2O3@D201 for FW degradation. Compared to the control group containing 10% microbial agents, the Fe2O3@D201-treated group showed higher levels of dissolved COD in the leachate, reaching 1.59 × 105 mg/L. Furthermore, the microbial hydrolytic enzyme activities in FW of this group surpassed those of the control group, with cellulase activity peaking at 0.13 U compared to the control group's peak of 0.06 U. Through 16S rRNA gene amplicon sequencing, we found that Fe2O3@D201 significantly enriched the abundance of Bacillus, which are commonly known for their hydrolysis functions. The results indicated that Fe2O3@D201 enhanced FW degradation by promoting the abundance of specialized microorganisms, and thus increased the hydrolytic enzyme activity, promoting the conversion of solid macromolecules into soluble organic matter. Consequently, Fe2O3@D201 shows potential for application in FW treatment equipment.
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Affiliation(s)
- Ying Han
- School of Environmental and Chemical Engineering, YanShan University, 438# West Hebei Street, Haigang District, Qinhuangdao, 066004, Hebei, People's Republic of China.
- Hebei Province Key Laboratory of Deep Remediation of Heavy Metals in Water and Resource Utilization, YanShan University, Qinhuangdao, 066004, People's Republic of China.
| | - Meiqi Yin
- School of Environmental and Chemical Engineering, YanShan University, 438# West Hebei Street, Haigang District, Qinhuangdao, 066004, Hebei, People's Republic of China
| | - Qingrui Zhang
- School of Environmental and Chemical Engineering, YanShan University, 438# West Hebei Street, Haigang District, Qinhuangdao, 066004, Hebei, People's Republic of China
- Hebei Province Key Laboratory of Deep Remediation of Heavy Metals in Water and Resource Utilization, YanShan University, Qinhuangdao, 066004, People's Republic of China
| | - Lili Tian
- School of Environmental and Chemical Engineering, YanShan University, 438# West Hebei Street, Haigang District, Qinhuangdao, 066004, Hebei, People's Republic of China
- Hebei Province Key Laboratory of Deep Remediation of Heavy Metals in Water and Resource Utilization, YanShan University, Qinhuangdao, 066004, People's Republic of China
| | - Hao Wu
- School of Environmental and Chemical Engineering, YanShan University, 438# West Hebei Street, Haigang District, Qinhuangdao, 066004, Hebei, People's Republic of China
| | - Yu Song
- Hebei Key Laboratory of Agroecological Safety, Hebei University of Environmental Engineering, Qinhuangdao, 066102, Hebei, People's Republic of China
| | - Xin He
- Hebei Key Laboratory of Agroecological Safety, Hebei University of Environmental Engineering, Qinhuangdao, 066102, Hebei, People's Republic of China
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Xu L, Lin Q, Wang S, Chen S, Yang R, Liu C, Hu Q, Zhao Z, Cao Z. Efficacy of black soldier fly larvae in converting kitchen waste and the dynamic alterations of their gut microbiome. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2025; 377:124613. [PMID: 39986157 DOI: 10.1016/j.jenvman.2025.124613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2024] [Revised: 01/26/2025] [Accepted: 02/16/2025] [Indexed: 02/24/2025]
Abstract
The escalating demand for food, driven by population growth and improved living standards, has prompted the development of efficient and eco-friendly kitchen waste (KW) treatment technologies. This study focused on the feasibility of utilizing KW through the application of black soldier fly larvae (BSFL), with a specific interest in the dynamic changes in the intestinal bacterial community during the treatment process. After a 10-day KW processing period, BSFL gained an average of 0.84 g/hundred worms/day, achieving a conversion efficiency of 18.52% for KW. This demonstrated their capacity to efficiently utilize KW nutrients for good growth performance. Additionally, the bioconversion of KW by BSFL could markedly decrease the presence of potentially pathogenic bacteria in the feed matrix within one day (P < 0.001), including Escherichia coli, Shigella spp., Salmonella spp., and Staphylococcus aureus. Notably, the diversity of the intestinal bacterial community in BSFL increased with age and sustained KW consumption (P < 0.05), accompanied by enhanced stability. In particular, the average relative abundance of potential probiotic genera associated with nutrient absorption and antimicrobial compounds synthesis, including Fusobacterium, Phascolarctobacterium, Enterococcus, and Actinomyces, increased. Conversely, the prevalence of pathogenic genera like Morganella and Escherichia-Shigella, decreased. Co-occurrence network analysis identified Lactobacillus, Brevibacterium, Erythrobacter, and Enterobacteriaceae as keystone species. Despite their low abundance in the BSFL intestine, these species were potentially crucial for KW bioconversion. Our findings underscore the potential of BSFL for sustainable KW conversion, providing strong support for effective waste management strategies.
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Affiliation(s)
- Le Xu
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China; Key Laboratory of Animal Nutrition and Feed Science of Yunnan Province, Kunming, 650201, China
| | - Qiuye Lin
- College of Food Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Shengwen Wang
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Shiyu Chen
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Rencan Yang
- Yunnan Animal Science and Veterinary Institute, Kunming, 650224, China
| | - Chen Liu
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Qingquan Hu
- Yunnan Animal Science and Veterinary Institute, Kunming, 650224, China
| | - Zhiyong Zhao
- Yunnan Animal Science and Veterinary Institute, Kunming, 650224, China.
| | - Zhenhui Cao
- Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China; Key Laboratory of Animal Nutrition and Feed Science of Yunnan Province, Kunming, 650201, China.
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Yang Z, Lin S, Wang H, Zhou J, Lin H, Zhou J. Simultaneous partial nitrification, endogenous and autotrophic denitrification in a single-stage electrolysis-integrated sequencing batch biofilm reactor (E-SBBR) for stable and enhanced kitchen digested wastewater treatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2025; 375:124200. [PMID: 39892261 DOI: 10.1016/j.jenvman.2025.124200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2024] [Revised: 12/20/2024] [Accepted: 01/17/2025] [Indexed: 02/03/2025]
Abstract
Simultaneous partial nitrification-denitrification (SPND) is a promising process for nitrogen (N) removal from kitchen digested wastewater characterized by a low C/N ratio. However, its widespread application is often restricted due to the unstable partial nitrification and unsatisfactory denitrification performance. This work developed a novel simultaneous partial nitrification, endogenous and autotrophic denitrification process using a single-stage electrolysis-integrated sequencing batch biofilm reactor (E-SBBR) with anoxic/electro-anaerobic/aerobic operating strategy. The novel process considerably enhanced the stability and N removal efficiency (NH4+-N>94.5% and TN>90.8%) of the SPND process. The pre-electro-anaerobic phase achieved alkalinity and H2 generation, and intracellular carbon storage. The increased alkalinity resulted in increased free ammonia (FA) which secured complete suppression of nitrite-oxidizing bacteria (NOB). SPND efficiency in the aerobic phase was dramatically improved using polyhydroxyalkanoates (PHAs) and H2 as electron donors for endogenous and autotrophic denitrification. Microbial community analysis indicated the successful washout of NOB and the enrichment of ammonia-oxidizing bacteria (AOB), denitrifying glycogen accumulating organisms (DGAOs), autotrophic and heterotrophic denitrifiers in the system. This research presents a distinctive SPND process for intensified kitchen digested wastewater treatment and gives insights into the underlying mechanism.
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Affiliation(s)
- Zhi Yang
- College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang, 550025, China
| | - Shuxuan Lin
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Hai Wang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Jiong Zhou
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Hong Lin
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Jian Zhou
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China.
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Ngabala FJ, Emmanuel JK. Potential substrates for biogas production through anaerobic digestion-an alternative energy source. Heliyon 2024; 10:e40632. [PMID: 39669150 PMCID: PMC11636105 DOI: 10.1016/j.heliyon.2024.e40632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2024] [Revised: 11/15/2024] [Accepted: 11/20/2024] [Indexed: 12/14/2024] Open
Abstract
Energy is a crucial part of a comprehensive desire to reach any country's long-term economic and social development. Fossil fuels have for a long time been used as the major global cause of energy. However, dependence on fossil fuels contributes to environmental damage. Biogas generation from biodegradable organic materials is a potential and sustainable substitute for addressing global energy supply inadequacy and curbing the environmental challenges associated with fossil fuels. Biotechnologies particularly anaerobic digestion technology are important process for the recovery of energy from organic materials. Biogas comes from bio-decomposition of various organic substrates and trash. Human excreta, agricultural wastes, industrial food residues, municipal wastes, food wastes and residues, fishery wastes, aquatic plants and forest residues are among the common organic wastes from which biogas is produced today. Properly designed biogas systems play a crucial role in renewable energy production, providing electricity, heating, and lighting from organic waste materials that would otherwise go to landfill. These systems convert agricultural residues, food waste, livestock manure, and even energy crops into biogas, which can be used to power generators, provide heat for cooking, or supply light in homes. In urban and remote areas, biogas digesters offer clean, alternative energy solutions that not only meet local energy demands but also enhance living conditions by reducing the reliance on expensive or polluting energy sources. For instance, households can save on energy costs and improve air quality by using biogas for cooking instead of traditional fuels. Besides, the implementation of biogas technology can significantly mitigate environmental impact by lowering greenhouse gas emissions, reducing waste, and promoting sustainable agricultural practices and supporting circular economy. This review explores a diverse range of potential substrates for biogas production, highlighting their viability as alternatives to fossil fuel-based energy sources and emphasizing the multifaceted benefits they provide to communities.
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Affiliation(s)
- Flaviana John Ngabala
- University of Dar Es Salaam, Mkwawa University College of Education, Department of Chemistry, P.O. Box 2513, Iringa, Tanzania
| | - Jovine Kamuhabwa Emmanuel
- University of Dar Es Salaam, Mkwawa University College of Education, Department of Chemistry, P.O. Box 2513, Iringa, Tanzania
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Li Y, Qiao W, Zhao G, Wu Z, Jiang P, Dong R. Pilot-scale study of enhanced thermophilic anaerobic digestion of food waste with the addition of trace elements. BIORESOURCE TECHNOLOGY 2024; 413:131454. [PMID: 39255946 DOI: 10.1016/j.biortech.2024.131454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2024] [Revised: 09/05/2024] [Accepted: 09/05/2024] [Indexed: 09/12/2024]
Abstract
Thermophilic anaerobic digestion (AD) offers many benefits for food waste treatment but is seldom adopted in industrial plants due to instability issue, particularly under higher loading conditions. This study thus conducted a 160-day continuous operation of a pilot-scale thermophilic AD system on-site. Results from the experiments showed that the system could operate under relatively lower loading but failed when the loading reached up to 5.69 kg·COD/(m3·d). Volatile fatty acids increased to 6000 mg/L at the corresponding hydraulic retention time of 15 days. Trace elements were then introduced, which restored higher process stability by reducing volatile fatty acids to 400 mg/L. The mass balance and materials decomposition resutls revealed the system's strong resilience. Methanoculleus (92.52 %) and Methanomassiliicoccus (6.55 %) were the dominant methanogens, a phenomenon rarely observed in similar thermophilic systems. This system may tolerate more stressful conditions, as the loading limits had not been reached with the addition of trace elements.
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Affiliation(s)
- Yang Li
- College of Engineering, China Agricultural University, Beijing 100083, China; Sanya Institute of China Agricultural University, Sanya, Hainan Province 572025, China.
| | - Wei Qiao
- College of Engineering, China Agricultural University, Beijing 100083, China; Sanya Institute of China Agricultural University, Sanya, Hainan Province 572025, China.
| | - Guoli Zhao
- Hainan Tropical Ocean University, Sanya, Hainan Province 572022, China.
| | - Zhiyue Wu
- College of Engineering, China Agricultural University, Beijing 100083, China.
| | - Pengwu Jiang
- College of Engineering, China Agricultural University, Beijing 100083, China; Sanya Institute of China Agricultural University, Sanya, Hainan Province 572025, China.
| | - Renjie Dong
- College of Engineering, China Agricultural University, Beijing 100083, China.
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Rex P, Meenakshisundaram N, Barmavatu P. Sustainable valorisation of kitchen waste through greenhouse solar drying and microwave pyrolysis- technology readiness level for the production of biochar. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2024; 22:381-395. [PMID: 39464812 PMCID: PMC11499482 DOI: 10.1007/s40201-024-00909-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 06/08/2024] [Indexed: 10/29/2024]
Abstract
This study proposes an integrated and sustainable approach for the effective conversion of kitchen waste into valuable products through a two-step process. The primary step involves the implementation of greenhouse solar drying to reduce the moisture content of kitchen waste. The secondary step implies microwave pyrolysis for effective degradation of kitchen waste to biooil, biogas and biochar. Biooil and biogas can be used as renewable fuel source. Biochar can be used as soil amendment. Selection of atmospheric conditions for biochar preparation is discussed, highlighting its crucial role in biochar characteristics. This article highlights, technology readiness level of biochar production from kitchen waste to assess the economic viability for the scalability of the process. In this entirety, the conversion of kitchen waste to valuable products through microwave pyrolysis has significant potential to address the challenges posed by high moisture content and heterogenous nature. With continued research and innovation, it is possible to develop a wide array of value-added products from kitchen waste, ultimately leading to a more eco-friendly and economic approach to waste management. Graphical Abstract
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Affiliation(s)
- Prathiba Rex
- Institute of Agricultural Engineering, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, 602 105 India
| | - Nagaraj Meenakshisundaram
- Institute of Agricultural Engineering, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, 602 105 India
| | - Praveen Barmavatu
- Department of Mechanical Engineering, Faculty of Engineering, Universidad Tecnológica Metropolitana, Av. José Pedro Alessandri 1242, Santiago, Chile
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Gómez-Muñoz L, Morales-Morales C, Castro-Bello M, González-Lorence A, Marmolejo-Vega C, Zagal-Barrera S. Design of experiments to evaluate pH and temperature parameters with different inoculums in domestic biodigester. Heliyon 2024; 10:e30542. [PMID: 38756594 PMCID: PMC11096967 DOI: 10.1016/j.heliyon.2024.e30542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 04/29/2024] [Accepted: 04/29/2024] [Indexed: 05/18/2024] Open
Abstract
The comprehensive management of organic urban solid waste is a concern due to its direct and indirect impact on the environment. Anaerobic Digestion (AD) has been recognized as an alternative and environmentally friendly technology for waste disposal, converting them into organic fertilizers and renewable energy. This research presents an experiment involving four reactors fed with household organic waste, three inoculated with canine, goat, and rabbit manure, and one without inoculum. The experiment was observed for 30 consecutive days to analyze the pH and temperature parameters involved in the AD process in domestic reactors. Statistical methodology, including one-way analysis of variance for assessing the effect of the type of inoculum, Tukey's simultaneous confidence intervals for mean differences, and 90 % confidence intervals for μ in temperature and manure, was utilized. Additionally, main effects analysis of the factors of average temperature and pH were conducted. The results of the one-factor experiment show that the type of inoculum does not significantly influence the variation in pH, while temperature remains relatively stable throughout the AD process. However, the analysis of main effects indicates that goat manure tends to stabilize the temperature with minimal variation, whereas variation is more heterogeneous in the other experiments.
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Affiliation(s)
- L. Gómez-Muñoz
- National Technological Institute of Mexico, Technological Institute of Chilpancingo, José Francisco Ruiz Massieu Avenue No. 5, Villa Moderna, Chilpancingo de los Bravo, Guerrero, 39090, Mexico
| | - C. Morales-Morales
- National Technological Institute of Mexico/Technological Institute of San Juan del Río, Technological Avenue No. 2, Quintas de Guadalupe, San Juan del Río, Querétaro, 76800, Mexico
| | - M. Castro-Bello
- National Technological Institute of Mexico, Technological Institute of Chilpancingo, José Francisco Ruiz Massieu Avenue No. 5, Villa Moderna, Chilpancingo de los Bravo, Guerrero, 39090, Mexico
| | - A. González-Lorence
- National Technological Institute of Mexico/Technological Institute of San Juan del Río, Technological Avenue No. 2, Quintas de Guadalupe, San Juan del Río, Querétaro, 76800, Mexico
| | - C.V. Marmolejo-Vega
- National Technological Institute of Mexico, Technological Institute of Chilpancingo, José Francisco Ruiz Massieu Avenue No. 5, Villa Moderna, Chilpancingo de los Bravo, Guerrero, 39090, Mexico
| | - S.R. Zagal-Barrera
- National Technological Institute of Mexico, Technological Institute of Chilpancingo, José Francisco Ruiz Massieu Avenue No. 5, Villa Moderna, Chilpancingo de los Bravo, Guerrero, 39090, Mexico
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Issahaku M, Derkyi NSA, Kemausuor F. A systematic review of the design considerations for the operation and maintenance of small-scale biogas digesters. Heliyon 2024; 10:e24019. [PMID: 38230247 PMCID: PMC10789629 DOI: 10.1016/j.heliyon.2024.e24019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 12/04/2023] [Accepted: 01/02/2024] [Indexed: 01/18/2024] Open
Abstract
This review investigates small-scale biogas digesters' design and construction considerations to address biogas digesters' failures shortly after installation. The frequent failures of small-scale or household biogas digesters negatively affect its adoption as a clean domestic cooking fuel in developing countries, affecting the achievement of Sustainable Development Goal (SDG) 7. The study considered Scopus database-indexed peer-reviewed journals published between 2000 and 2022. Selected papers focussed on real-time monitoring, stirring mechanisms, and temperature control systems based on predefined inclusion and exclusion criteria with initial search results of 4751 documents, narrowing to 55 papers. The PRISMA 2020 statement was adopted to conduct the study. The study highlights the importance of incorporating a real-time monitoring system as a design factor in small-scale biogas digesters for successful operation and maintenance. The study's findings may be helpful to practitioners, policymakers, and researchers promoting sustainable energy and waste management solutions in low-resource settings.
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Affiliation(s)
- Mubarick Issahaku
- Regional Centre for Energy and Environmental Sustainability, University of Energy and Natural Resources, Sunyani, Ghana
- Energy Technology Centre, School of Engineering, University for Development Studies, P. O. Box TL 1350, Tamale, Ghana
| | - Nana Sarfo Agyemang Derkyi
- Regional Centre for Energy and Environmental Sustainability, University of Energy and Natural Resources, Sunyani, Ghana
| | - Francis Kemausuor
- The Brew-Hammond Energy Center, College of Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
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Ding C, Zhang Y, Li X, Liu Q, Li Y, Lu Y, Feng L, Pan J, Zhou H. Strategy to enhance the semicontinuous anaerobic digestion of food waste via exogenous additives: experimental and machine learning approaches. RSC Adv 2023; 13:35349-35358. [PMID: 38053678 PMCID: PMC10695191 DOI: 10.1039/d3ra05811e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Accepted: 11/21/2023] [Indexed: 12/07/2023] Open
Abstract
The anaerobic digestion (AD) of food waste (FW) was easy to acidify and accumulate ammonia nitrogen. Adding exogenous materials to the AD system can enhance its conversion efficiency by alleviating acidification and ammonia nitrogen inhibition. This work investigated the effects of the addition frequency and additive amount on the AD of FW with increasing organic loading rate (OLR). When the OLR was 3.0 g VS per L per day and the concentration of the additives was 0.5 g per L per day, the stable methane yield reached 263 ± 22 mL per g VS, which was higher than that of the group without the additives (189 mL per g VS). Methanosaetaceae was the dominant archaea, with a maximum abundance of 93.25%. Through machine learning analysis, it was found that the optimal daily methane yield could be achieved. When the OLR was within the range of 0-3.0 g VS per L per day, the pH was within the range of 7.6-8.0, and the additive concentration was more than 0.5 g per L per day. This study proposed a novel additive and determined its usage strategy for regulating the AD of FW through experimental and simulation approaches.
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Affiliation(s)
- Chuan Ding
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, College of New Energy and Materials, China University of Petroleum Beijing (CUPB) Beijing 102249 P. R. China
| | - Yi Zhang
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, College of New Energy and Materials, China University of Petroleum Beijing (CUPB) Beijing 102249 P. R. China
| | - Xindu Li
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, College of New Energy and Materials, China University of Petroleum Beijing (CUPB) Beijing 102249 P. R. China
| | - Qiang Liu
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, College of New Energy and Materials, China University of Petroleum Beijing (CUPB) Beijing 102249 P. R. China
| | - Yeqing Li
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, College of New Energy and Materials, China University of Petroleum Beijing (CUPB) Beijing 102249 P. R. China
| | - Yanjuan Lu
- Beijing Fairyland Environmental Technology Co., Ltd Beijing 100080 P. R. China
| | - Lu Feng
- Division of Environment and Natural Resources, Norwegian Institute of Bioeconomy Research (NIBIO) 1431 Ås Norway
| | - Junting Pan
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences Beijing 100081 P. R. China
| | - Hongjun Zhou
- State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, College of New Energy and Materials, China University of Petroleum Beijing (CUPB) Beijing 102249 P. R. China
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Tian H, Yan M, Zhou J, Wu Q, Tiong YW, Lam HT, Zhang J, Tong YW. A closed loop case study of decentralized food waste management: System performance and life cycle carbon emission assessment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 899:165783. [PMID: 37495140 DOI: 10.1016/j.scitotenv.2023.165783] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/06/2023] [Accepted: 07/23/2023] [Indexed: 07/28/2023]
Abstract
Food waste (FW) has become a worldwide issue, while anaerobic digestion (AD) has appeared as a widely adopted technology to recover energy and resources from FW. Compared to many existing case studies of centralized AD system, the comprehensive study of decentralized micro-AD system from both system energy efficiency and carbon emission perspective is still scanty, particularly system operated under ambient temperature conditions. In this study, an actual decentralized micro-AD system with treating capacity of 300 kg FW/d for a local hawker center in Singapore was reported and evaluated. The results showed that 1894.5 kg of FW was treated and 173 m3 biogas with methane content of 53 % was produced during the experimental period of 75 days. The methane yield results showed a high FW degradation efficiency (87.87 %). However, net energy consumption and net carbon emission were observed during the experimental period. Nevertheless, energy self-efficiency and carbon neutrality, even net energy output and carbon reduction, can be achieved by increasing daily FW loading and biogas engine efficiency. Specifically, the FW loading for system energy self-efficiency was identified as 159 kg/d for engine efficiency of 35 % at a high kitchen waste/table waste ratio (63 %/37 %, with covid-19 dine-in restrictions); while they were 112 and 58 kg/d for engine efficiency of 25 % and 35 %, respective, at a low kitchen waste/table waste ratio (31 %/69 %, without covid-19 dine-in restrictions). The carbon emission ranged from 156.08 kg CO2-eq/t FW to -77.35 kg CO2-eq/t FW depending on the FW loading quantity and engine efficiency. Moreover, the sensitivity analysis also showed that the used electricity source for substitution influenced the carbon emission performance significantly. The obtained results imply that the decentralized micro-AD system could be a feasible FW management solution for energy generation and carbon reduction when the FW loading and engine electrical efficiency are carefully addressed.
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Affiliation(s)
- Hailin Tian
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China; Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore
| | - Miao Yan
- Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Jieyu Zhou
- Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore
| | - Qinglian Wu
- Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150000, China
| | - Yong Wei Tiong
- Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore
| | - Heng Thong Lam
- Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore
| | - Jingxin Zhang
- China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
| | - Yen Wah Tong
- Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore; Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, 117585, Singapore.
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12
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Wang P, Yu M, Lin P, Zheng Y, Ren L. Effects of biochar supported nano zero-valent iron with different carbon/iron ratios on two-phase anaerobic digestion of food waste. BIORESOURCE TECHNOLOGY 2023; 382:129158. [PMID: 37164227 DOI: 10.1016/j.biortech.2023.129158] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 04/30/2023] [Accepted: 05/06/2023] [Indexed: 05/12/2023]
Abstract
The promotion effects of biochar supported nano zero-valent iron (BC/nZVI) with different carbon/iron ratios on two-phase anaerobic digestion (AD) of food waste (FW) were studied. Results suggested that when the carbon/iron ratio was 3:1 AD system showed the best performance, with the concentration of volatile fatty acids (VFAs) in acidogenic phase (AP) and the cumulative methane production in methanogenic phase (MP) increased by 31.4% and 24.8%, respectively. Metagenomic analysis demonstrated that BC/nZVI increased the relative abundance of Defluviitoga in AP, and promoted the growth of Methanothrix in MP. Metabolic pathway analysis in AP indicated that BC/nZVI mainly promoted the abundances of acetate kinase and butyrate kinase to enhance acid production. Methane metabolism pathway analysis in MP revealed that BC/nZVI increased methane production by promoting the module of M00357 and activating related enzymes. The results of this sutdy showed that BC/nZVI promoted AD of FW mainly through acetoclastic methanogenic pathway.
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Affiliation(s)
- Pan Wang
- School of Ecology and Environment, State Environmental Protection Key Laboratory of Food Chain Pollution Control, Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
| | - Miao Yu
- School of Ecology and Environment, State Environmental Protection Key Laboratory of Food Chain Pollution Control, Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
| | - Peiru Lin
- School of Ecology and Environment, State Environmental Protection Key Laboratory of Food Chain Pollution Control, Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
| | - Yi Zheng
- Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Suzhou 215128, China
| | - Lianhai Ren
- School of Ecology and Environment, State Environmental Protection Key Laboratory of Food Chain Pollution Control, Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China.
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13
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Nanlin L, Fan L, Hua Z, Liming S, Pinjing H. Environmental and economic assessment of the construction, operation, and demolition of a decentralized composting facility. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 884:163724. [PMID: 37116801 DOI: 10.1016/j.scitotenv.2023.163724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 04/20/2023] [Accepted: 04/21/2023] [Indexed: 05/10/2023]
Abstract
Decentralized waste treatment facilities are recently highlighted for the treatment of solid waste in rural areas for being cheap, flexible, and reliable. Among them, decentralized composting is most commonly used. Many forms of decentralized composting facilities also develop and apply in developing countries, but the environmental and economical performances remain unknown. Therefore, this study analyzed the environmental impacts and cost of a decentralized composting facility through life cycle assessment and life cycle cost. The functional unit was the construction, operation, and demolition the composting facility. Contribution and sensitivity analysis were also performed to find out the most influential processes and parameters. The facility had a 10-year designed life span and could treat about 5840 t organic waste in its life cycle. The life cycle environmental impacts were 646,700 kg CO2-eq, 8980 kg SO2-eq, -28 kg P-eq, 7.09 × 10-3 CTUh, 0.13 CTUh, and 16,754 kg oil-eq for climate change, terrestrial acidification, freshwater eutrophication, human toxicity cancer effects, human toxicity non-cancer effects, and fossil resources scarce, respectively. The life cycle cost was 1080.925 k CNY. When scaling to treating 1 t organic waste, the environmental impacts were close to those of similar decentralized and centralized composting facilities and the cost was lower than those of centralized biological treatment plants when excluding revenues from compost. According to the contribution and sensitivity analysis, the operation stage had the largest environmental impacts. The composting and compost substitution processes in the operation stage were the most sensitive processes. This study proved quantitatively that the decentralized facility was feasible both environmentally and economically and enriched the study cases for decentralized composting facilities.
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Affiliation(s)
- Liao Nanlin
- Institute of Waste Treatment and Reclamation, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China; State Key Laboratory of Pollution Control and Source Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
| | - Lü Fan
- Institute of Waste Treatment and Reclamation, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China; State Key Laboratory of Pollution Control and Source Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
| | - Zhang Hua
- Institute of Waste Treatment and Reclamation, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China; State Key Laboratory of Pollution Control and Source Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
| | - Shao Liming
- Institute of Waste Treatment and Reclamation, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China; State Key Laboratory of Pollution Control and Source Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China
| | - He Pinjing
- Institute of Waste Treatment and Reclamation, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
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The Preparation Processes and Influencing Factors of Biofuel Production from Kitchen Waste. FERMENTATION-BASEL 2023. [DOI: 10.3390/fermentation9030247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
Abstract
Kitchen waste is an important component of domestic waste, and it is both harmful and rich in resources. Approximately 1.3 billion tons of kitchen waste are produced every year worldwide. Kitchen waste is high in moisture, is readily decayed, and has an unpleasant smell. Environmental pollution can be caused if this waste is treated improperly. Conventional treatments of kitchen waste (e.g., landfilling, incineration and pulverization discharge) cause environmental, economic, and social problems. Therefore, the development of a harmless and resource-based treatment technology is urgently needed. Profits can be generated from kitchen waste by converting it into biofuels. This review intends to highlight the latest technological progress in the preparation of gaseous fuels, such as biogas, biohythane and biohydrogen, and liquid fuels, such as biodiesel, bioethanol, biobutanol and bio-oil, from kitchen waste. Additionally, the pretreatment methods, preparation processes, influencing factors and improvement strategies of biofuel production from kitchen waste are summarized. Problems that are encountered in the preparation of biofuels from kitchen waste are discussed to provide a reference for its use in energy utilization. Optimizing the preparation process of biofuels, increasing the efficiency and service life of catalysts for reaction, reasonably treating and utilizing the by-products and reaction residues to eliminate secondary pollution, improving the yield of biofuels, and reducing the cost of biofuels, are the future directions in the biofuel conversion of kitchen waste.
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15
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Liao N, Lü F, Zhang H, He P. Life cycle assessment of waste management in rural areas in the transition period from mixed collection to source-separation. WASTE MANAGEMENT (NEW YORK, N.Y.) 2023; 158:57-65. [PMID: 36640669 DOI: 10.1016/j.wasman.2023.01.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 12/19/2022] [Accepted: 01/07/2023] [Indexed: 06/17/2023]
Abstract
Rural solid waste management is essential for fulfilling sustainable development goals, especially in developing countries. However, quantitative study on this aspect has been little and far behind the urban areas. In this study, the environmental impacts of four typical rural solid waste management systems were quantified using life cycle assessment based on data from field investigations of five towns across four seasons. Sensitivity analysis was used to determine the most influential parameters. The results showed that landfilling mixed waste contributed the highest environmental impacts. By substituting landfilling with incineration, the environmental impacts (i.e., global warming potential, terrestrial acidification potential, fossil resource scarcity, freshwater ecotoxicity potential) dropped about 110%-900%. When shifting collection schemes to source separation, the environmental impacts also decreased by approximately 50%-200%. However, the environmental impacts of applying source separation to the existing management systems with mixed collection and disposal facilities of landfill or waste-to-energy (WTE) incineration are unclear and depend on the performance of decentralized composting and anaerobic digestion facilities, which need further investigations. Compared with urban cases, the landfill in rural areas emits higher greenhouse gas (GHG), and WTE incineration plants in rural areas have similar GHG emissions to WTE in urban areas. Besides, energy recovery was the most influential process in WTE systems and a 1% improvement on that would bring over 10% progress on global warming potential impact category. These findings can be useful for improving and developing rural domestic waste treatment in China and other developing countries.
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Affiliation(s)
- Nanlin Liao
- Institute of Waste Treatment and Reclamation, Tongji University, No. 1239 Siping Road, Shanghai 200092, People's Republic of China; State Key Laboratory of Pollution Control and Source Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
| | - Fan Lü
- Institute of Waste Treatment and Reclamation, Tongji University, No. 1239 Siping Road, Shanghai 200092, People's Republic of China; State Key Laboratory of Pollution Control and Source Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
| | - Hua Zhang
- Institute of Waste Treatment and Reclamation, Tongji University, No. 1239 Siping Road, Shanghai 200092, People's Republic of China; State Key Laboratory of Pollution Control and Source Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, People's Republic of China.
| | - Pinjing He
- Institute of Waste Treatment and Reclamation, Tongji University, No. 1239 Siping Road, Shanghai 200092, People's Republic of China.
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16
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Food waste valorization applying the biorefinery concept in the Colombian context: Pre-feasibility analysis of the organic kitchen food waste processing. Biochem Eng J 2023. [DOI: 10.1016/j.bej.2023.108864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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17
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Liu Y, Liu WQ, Huang S, Xu H, Lu H, Wu C, Li J. Cell-free metabolic engineering enables selective biotransformation of fatty acids to value-added chemicals. Metab Eng Commun 2022; 16:e00217. [PMID: 36578475 PMCID: PMC9791597 DOI: 10.1016/j.mec.2022.e00217] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Accepted: 12/13/2022] [Indexed: 12/15/2022] Open
Abstract
Fatty acid-derived products such as alkanes, fatty aldehydes, and fatty alcohols have many applications in the chemical industry. These products are predominately produced from fossil resources, but their production processes are often not environmentally friendly. While microbes like Escherichia coli have been engineered to convert fatty acids to corresponding products, the design and optimization of metabolic pathways in cells for high productivity is challenging due to low mass transfer, heavy metabolic burden, and intermediate/product toxicity. Here, we describe an E. coli-based cell-free protein synthesis (CFPS) platform for in vitro conversion of long-chain fatty acids to value-added chemicals with product selectivity, which can also avoid the above issues when using microbial production systems. We achieve the selective biotransformation by cell-free expression of different enzymes and the use of different conditions (e.g., light and heating) to drive the biocatalysis toward different final products. Specifically, in response to blue light, cell-free expressed fatty acid photodecarboxylase (CvFAP, a photoenzyme) was able to convert fatty acids to alkanes with approximately 90% conversion. When the expressed enzyme was switched to carboxylic acid reductase (CAR), fatty acids were reduced to corresponding fatty aldehydes, which, however, could be further reduced to fatty alcohols by endogenous reductases in the cell-free system. By using a thermostable CAR and a heating treatment, the endogenous reductases were deactivated and fatty aldehydes could be selectively accumulated (>97% in the product mixture) without over-reduction to alcohols. Overall, our cell-free platform provides a new strategy to convert fatty acids to valuable chemicals with notable properties of operation flexibility, reaction controllability, and product selectivity.
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Affiliation(s)
- Yushi Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Wan-Qiu Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Shuhui Huang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Huiling Xu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Haofan Lu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China
| | - Changzhu Wu
- Danish Institute for Advanced Study (DIAS) and Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Odense, 5230, Denmark
| | - Jian Li
- School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China,Corresponding author.
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Cai L, Guo HT, Zheng GD, Wang XY, Wang K. Metagenomic analysis reveals the microbial degradation mechanism during kitchen waste biodrying. CHEMOSPHERE 2022; 307:135862. [PMID: 35944670 DOI: 10.1016/j.chemosphere.2022.135862] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 06/14/2022] [Accepted: 07/24/2022] [Indexed: 06/15/2023]
Abstract
Biodrying is a treatment to remove moisture using bio-heat generated during organic degradation. Organic matter degradation and microbial metabolism were studied during the whole kitchen waste biodrying, using metagenomic analysis. After the 25-day biodrying process, carbohydrate, protein and lipid contents decreased by 83.7%, 27.8% and 79.3%, respectively, and their degradation efficiencies increased after the thermophilic phase. Lipase activity exceeded 10 mmol d-1 g-1 throughout biodrying. Cellulase and lipase activities recovered by 2.21% and 5.77%, respectively, after the thermophilic phase, while the protease activity had a maximum increment of 347%. Metabolic analysis revealed that carbohydrate, amino acid and lipid metabolism was possibly inhibited by the high temperature, but the relative abundances of related predicted functions recovered by more than 0.9%, 7% and 11%, respectively, by the end of biodrying. Protein function prediction suggests that β-oxidation, fatty acid biosynthesis, and the degradation of cellulose and chitin were possibly enhanced during the thermophilic phase. Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis revealed that leucine, isoleucine and lysine could ultimately degraded to acetyl-CoA. Weissella, Aeribacillus and Bacillus were the genera with the most enriched functional genes during the whole biodrying process. These findings help elucidate the microbial degradation processes during biodrying, which provides further scientific support for improving the application of biodrying products.
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Affiliation(s)
- Lu Cai
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China
| | - Han-Tong Guo
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Guo-Di Zheng
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Xin-Yu Wang
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China
| | - Kan Wang
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China.
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Esteban-Lustres R, Torres MD, Piñeiro B, Enjamio C, Domínguez H. Intensification and biorefinery approaches for the valorization of kitchen wastes - A review. BIORESOURCE TECHNOLOGY 2022; 360:127652. [PMID: 35872274 DOI: 10.1016/j.biortech.2022.127652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 07/14/2022] [Accepted: 07/15/2022] [Indexed: 06/15/2023]
Abstract
Kitchen wastes (KW) are post-consumption residues from household and food service sector, heterogenous in composition and highly variable depending on the particular origin, which are often treated as municipal. There is a need to improve the management of these continuously produced and worldwidely available resources and their valorization into novel and commercially interesting products will aid in the development of bioeconomy. The successful implementation of such approach requires cooperation between academia, industrial stakeholders, public and private institutions, based on the different dimensions, including social, economic, ecologic and technological involved. This review aims at presenting a survey of technological aspects, regarding current and potential management strategies of KW, following either a single or multiproduct processing according to the biorefineries scheme. Emphasis is given to intensification tools, designed to enhance process efficiency.
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Affiliation(s)
- Rebeca Esteban-Lustres
- CINBIO, Departament of Chemical Engineering, Faculty of Sciences, Campus Ourense, University of Vigo, Edificio Politécnico, As Lagoas, 32004 Ourense, Spain
| | - María Dolores Torres
- CINBIO, Departament of Chemical Engineering, Faculty of Sciences, Campus Ourense, University of Vigo, Edificio Politécnico, As Lagoas, 32004 Ourense, Spain.
| | - Beatriz Piñeiro
- Economic Resources, CHOU, SERGAS, Ramon Puga Noguerol, 54, 32005 Ourense, Spain
| | - Cristina Enjamio
- Galaria, SERGAS, Edificio Administrativo San Lázaro s/n, 15701 Santiago de Compostela, A Coruña, Spain
| | - Herminia Domínguez
- CINBIO, Departament of Chemical Engineering, Faculty of Sciences, Campus Ourense, University of Vigo, Edificio Politécnico, As Lagoas, 32004 Ourense, Spain
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Yu D, Yu Y, Tang J, Li X, Ke C, Yao Z. Application fields of kitchen waste biochar and its prospects as catalytic material: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 810:152171. [PMID: 34875332 DOI: 10.1016/j.scitotenv.2021.152171] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 11/30/2021] [Accepted: 11/30/2021] [Indexed: 06/13/2023]
Abstract
In China, a large amount of kitchen waste (KW) is generated each year, and the resource utilisation of the KW has become a problem. KW has a high carbon content and can be used as a raw material for biochar. Kitchen waste biochar (KWB) can be used to prepare adsorption materials, soil amendments, energy materials, carbon quantum dots, and electrode materials. However, few studies have used KWB as a raw material for catalytic materials. The application of sulfur (S) and nitrogen (N) doped biochar in the field of catalysis has proved effective and feasible. KWB contained a certain mass percentage of N and S elements, which has good application potential for use in the field of catalysis by KWB. In the process of preparing KWB by KW, keeping S and N as much as possible and converting them into pyridine N and thiophene S benefit the application of catalysis. This review provides a reference for the future application of KWB in China.
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Affiliation(s)
- Dayang Yu
- School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China
| | - Yan Yu
- School of Chemical & Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
| | - Jiawei Tang
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing 100011, China
| | - Xiuqing Li
- Shandong Provincial Research Institute of Coal Geology Planning and Exploration, Jinan 250104, China
| | - Chao Ke
- Baohang Environment Company Limited, Beijing 100012, China
| | - Zhiliang Yao
- School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China.
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