Review
Environmental Sciences
Archana Paranjpe, Seema Saxena, Pankaj Jain
Summary: Anaerobic co-digestion is an important technology for processing organic waste, recovering nutrients, and creating sustainable biofuel. However, the low biogas output and high installation costs limit its viability. This literature review demonstrates that anaerobic co-digestion produces more methane biogas than anaerobic digestion, and adjusting the waste-to-water waste ratio can increase methane production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Energy & Fuels
Fuad Ameen, J. Ranjitha, Nazmul Ahsan, Vijayalakshmi Shankar
Summary: The co-digestion of microbial biomass with animal manures showed higher biogas production compared to digestion of animal manure alone. A three-stage anaerobic digester designed in the study had an average methane yield of 0.442 L/gVS and achieved a reduction of about 68% in volatile solids.
Article
Environmental Sciences
Zhongzhong Wang, Shun Wang, Sihuang Xie, Yan Jiang, Jizhong Meng, Guangxue Wu, Yuansheng Hu, Xinmin Zhan
Summary: The study found that the addition of biochar has a slight increase in specific methane yield in dry anaerobic digestion, especially in the degradation of poorly biodegradable organics. However, the supplementation of biochar did not significantly affect the peak methane production rate, possibly due to the important role of enhancing electron transfer mechanism.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Anastasia Kampioti, Dimitrios Komilis
Summary: The viability of co-digestion of coffee waste with other organic waste was investigated. The study found that co-digestion of coffee waste with anaerobic sludge had a positive effect, while co-digestion with cow manure and food waste had a negative effect on biogas generation.
Article
Chemistry, Physical
Ming-Yan Shen, Marco Torre, Chen-Yeon Chu, Patrizio Tratzi, Monica Carnevale, Francesco Gallucci, Valerio Paolini, Francesco Petracchini
Summary: This study investigates the effects of different ratios of food waste to seed digestate and pH values on biohydrogen production in an anaerobic reactor. The results show that cattle manure and chicken manure in the seed digestate can adapt to high concentrations of COD in food waste and increase biohydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Agricultural Engineering
Wanli Zhang, Tianqi Kong, Wanli Xing, Rundong Li, Tianhua Yang, Nan Yao, Dan Lv
Summary: The study investigated the links between C/N ratio, synergy, and microbial characteristics of anaerobic co-digestion of different organic wastes. Co-digestion demonstrated the ability to overcome C/N imbalance, achieve multiple synergies, and improve methane production. Adjusting the C/N ratio of the system led to enhanced methanogenic functions and system stability.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Wanli Zhang, Xue Wang, Wanli Xing, Rundong Li, Tianhua Yang, Nan Yao, Dan Lv
Summary: The study found that co-digestion of food waste with cattle manure is more likely to achieve synergy compared to other combinations, which is achieved through coupling effects such as improving nutrient balance and dilution of toxic compounds. In the process of co-digestion, specific microbial communities can accelerate detoxification and system recovery through co-metabolism.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Cheng Yu, Bi Dongsu, Zhang Tao, Jiang Xintong, Chen Ming, Wang Siqi, Shen Zheng, Zhang Yalei
Summary: Bioplastic bags have the potential to replace traditional petroleum-based plastic bags as they can be anaerobically digested with food waste to produce renewable energy.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Energy & Fuels
Ayobami Orangun, Harjinder Kaur, Raghava R. Kommalapati
Summary: Improper management of concentrated goat feeding operations in the US can lead to greenhouse gas emissions and water pollution. Co-digestion of 60% goat manure was found to achieve the highest biomethane yields in the study.
Article
Engineering, Environmental
Shun Wang, Yuansheng Hu, Zhenhu Hu, Weixiang Wu, Zhongzhong Wang, Yan Jiang, Xinmin Zhan
Summary: Dry anaerobic co-digestion (AcoD) with 20% total solids content was more effective in reducing total antibiotic resistance genes (ARGs), especially aminoglycosides, multidrug, and sulfonamide resistance genes, compared to wet AcoD with 5% total solids content. Efflux pump and antibiotic deactivation resistance mechanisms of ARGs were significantly reduced by dry AcoD. Network analysis revealed significant correlations between ARGs, mobile genetic elements (MGEs), and microbial communities.
Article
Engineering, Environmental
Jiri Rusin, Katerina Chamradova, Panagiotis Basinas
Summary: Anaerobic digestion of food waste at low temperature can efficiently produce biomethane. The two-stage low-temperature reactor is more energy-efficient and operates stably compared to mesophilic reactors.
Article
Green & Sustainable Science & Technology
Angeliki Maragkaki, Christos Tsompanidis, Kelly Velonia, Thrassyvoulos Manios
Summary: Bioplastics, commonly used for food packaging and carrier bags, can be sent to biogas plants from the separate collection of organic waste. This study focused on the valorization of poly-L-lactic acid (PLLA) composed of food waste through anaerobic digestion. The addition of PLLA increased biogas production without negative impacts on the operation of reactors in both laboratory and pilot-scale experiments.
Article
Agricultural Engineering
Nadiia Nikulina, Seda Uslu, Andreas Lemmer, Nuri Azbar, Hans Oechsner
Summary: The anaerobic co-digestion experiment found that the optimal methane yield was achieved with a 20/80 ratio of organic solid waste/solid inoculum with liquid inoculum under thermophilic conditions. Addition of chicken manure positively influenced the start-up phase and helped maintain pH within the optimal range.
BIORESOURCE TECHNOLOGY
(2021)
Review
Green & Sustainable Science & Technology
William Foster, Ulugbek Azimov, Paola Gauthier-Maradei, Liliana Castro Molano, Madeleine Combrinck, Jose Munoz, Jaime Jaimes Esteves, Luis Patino
Summary: This paper reviews the waste-to-energy sector, emphasizing the processes and feedstock involved, particularly highlighting the potential of anaerobic digestion in reducing pollution from manure and slurry. The significant role of manure in producing biogas for electricity generation is discussed, with the possibility of producing over 1.615 TWh of electricity in the UK if most manure and slurry were processed through biogas harvesting.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Thermodynamics
Lingkan Ding, Jun Cheng, Dan Qiao, Hui Li, Ze Zhang
Summary: In this study, mild hydrothermal pretreatment of raw food waste was used to improve the performance of subsequent anaerobic digestion, leading to successful bioenergy recovery from food waste. The pretreated food waste showed stable production in a two-stage system, while the raw food waste and one-stage system exhibited a decline in performance. Microbial community analysis revealed the mechanism behind the pretreatment, and the pretreated food waste had a significant advantage in reducing energy yield.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Jingxin Zhang, Danning Gu, Jiaqi Chen, Yiliang He, Yanjun Dai, Kai-Chee Loh, Yen Wah Tong
Summary: The study examines the efficiency of using biogas generated from anaerobic digestion of food waste for electricity and heat generation, as well as the energy balance after scaling up the system. Through system optimization, significant improvements in thermal and electrical energy outputs can be achieved, enabling the efficient utilization of waste resources and provision of green energy for communities.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Hailin Tian, Xiaonan Wang, Ee Yang Lim, Jonathan T. E. Lee, Alvin W. L. Ee, Jingxin Zhang, Yen Wah Tong
Summary: This study compared the environmental impact of different anaerobic digestion configurations and biogas applications, showing that decentralized AD with biogas as cooking fuel achieved the highest environmental benefit.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Yiyuan Qu, Chengyu Xiao, Endashaw Workie, Jingxin Zhang, Yiliang He, Yen Wah Tong
Summary: The study demonstrated that an Fe anode-assisted bioelectrochemical anaerobic digester can significantly improve methane production performance under high salt stress in food waste. This improvement is achieved by enhancing the gene abundance and enzyme activity of salt-tolerant microbial communities, allowing for better methane metabolism and salt tolerance.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Jiaqi Chen, Pengshuai Zhang, Jingxin Zhang, Yiliang He, Yen Wah Tong
Summary: The study reveals that magnetite-loaded biochar can serve as a potential additive to enhance electron transfer and increase methane production. It enhances the acetoclastic and hydrogenotrophic methanogenic pathways through accelerating the consumption of short-chain fatty acids and enhancing the activity of enzymes. Additionally, magnetite-loaded biochar promotes direct interspecies electron transfer by increasing the quantity and viability of live microorganisms.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Environmental Sciences
Le Zhang, Dingding Yao, To-Hung Tsui, Kai-Chee Loh, Chi-Hwa Wang, Yanjun Dai, Yen Wah Tong
Summary: A hybrid biological and thermal system was investigated to convert plastic-containing food waste into renewable energy. The results showed that anaerobic digestion and CO2 gasification of the plastic-containing waste produced higher methane and syngas yields compared to pure waste. Addition of biochar further increased methane production due to selective enrichment of certain microbial communities. The system has promising potential for industrial-scale treatment of plastic-containing food waste and recovery of renewable biofuels and bioresources.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Ning Yan, Kang Zhou, Yen Wah Tong, David Tai Leong, Maxim Park Dickieson
Summary: Traditional farming is facing challenges in meeting the needs of a growing population while preserving the environment. A green chemical farming concept, leveraging chemistry and chemical engineering, offers a pathway to efficient and renewable food production.
NATURE SUSTAINABILITY
(2022)
Article
Nanoscience & Nanotechnology
Chixuan Liu, Yen Wah Tong
Summary: Bioprinting is a precise manufacturing technology for customized 3D biological constructs utilizing biomaterials, cells, and sometimes growth factors. However, its translational application is hindered by the lack of efficient techniques for blood vessel fabrications. In this report, an efficient blood vessel bioprinting technique based on interfacial polyelectrolyte complexation was proposed and investigated. This technique demonstrated clear vascular features and the study on peptide sequencing's effect on the biocompatibility of the polyelectrolyte-peptide amphiphile complex is also interesting and relevant for vascular structure fabrication research.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Environmental Sciences
Yong Wei Tiong, Pooja Sharma, Hailin Tian, To-Hung Tsui, Heng Thong Lam, Yen Wah Tong
Summary: The aim of this study was to evaluate the feasibility of using a pilot-scale anaerobic digester to treat food waste generated from a hawker centre in an urban area of Singapore. The results showed that the decentralized system had an average specific methane yield of 0.55 +/- 0.04 m3CH4/kgVS, with methane concentrations of 56.6 +/- 2.3%. The energy assessment revealed an average consumption rate of 2.05 +/- 0.57 m3/kW h for power generation. Additionally, the study identified the microbial communities present in the digester during the startup phase, providing new insights into decentralized anaerobic digestion of food waste.
Article
Environmental Sciences
Miao Yan, Hailin Tian, Shuang Song, Hugh T. W. Tan, Jonathan T. E. Lee, Jingxin Zhang, Pooja Sharma, Yong Wei Tiong, Yen Wah Tong
Summary: The increasing food waste and excessive use of mineral fertilizers have had harmful effects on soil, water, and air quality. To address this issue, the study investigated the effects of digestate-encapsulated biochar on plant growth, soil characteristics, nutrient leaching, and soil microbiome. The results showed that digestate-encapsulated biochar had positive effects on plants and was the most effective in increasing chlorophyll content, fresh weight, leaf area, and blossom frequency. In terms of soil characteristics and nutrient retention, digestate-encapsulated biochar had the least nutrient leaching compared to other fertilizers and soil additives. Additionally, it improved the soil immune system and promoted the nitrification process while inhibiting denitrification. This study provides valuable insights into the use of digestate-encapsulated biochar as a sustainable fertilizer or soil additive, as well as the management of food waste digestate.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Chemical
Jie Li, Lanyu Li, Yen Wah Tong, Xiaonan Wang
Summary: Gasification is a sustainable method for treating biomass waste and producing combustible H-2-syngas. The distribution and composition of the generated products depend on the feedstock information and gasification condition. Machine learning models have been used to predict and optimize the gasification process, providing valuable insights for the production of H-2-rich syngas.
GREEN CHEMICAL ENGINEERING
(2023)
Article
Agricultural Engineering
Pooja Sharma, Yong Wei Tiong, Miao Yan, Hailin Tian, Heng Thong Lam, Jingxin Zhang, Yen Wah Tong
Summary: The study evaluated the effects of soil amendments and food waste anaerobic digestate on the growth of an ornamental plant. The results showed that the addition of soil amendments along with FWAD significantly improved the growth of Stachytarpheta jamaicensis, as indicated by increased chlorophyll content, height, and number of leaves. The microbial community analysis revealed the dominant phyla present in the rhizospheric zone of Stachytarpheta jamaicensis. The study suggests that FWAD can be a practical alternative to commercial fertilizer.
BIOMASS & BIOENERGY
(2023)
Review
Biotechnology & Applied Microbiology
Pooja Sharma, Sheetal Kishor Parakh, To Hung Tsui, Ambreen Bano, Surendra Pratap Singh, Vijay Pratap Singh, Su Shiung Lam, Ashok Kumar Nadda, Yen Wah Tong
Summary: The generation, recycling, and reuse of food waste (FW) have been discussed, and anaerobic digestion (AD) is proposed as an effective method for converting FW into biogas and bio-fertilizers.
CRITICAL REVIEWS IN BIOTECHNOLOGY
(2023)
Article
Thermodynamics
Jianrui Liu, Harn Wei Kua, Chi-Hwa Wang, Yen Wah Tong, Jingxin Zhang, Yinghong Peng
Summary: This paper studies the location planning problems of waste-to-energy facilities under uncertainty from an integrated perspective. It develops a multi-criteria decision analysis framework using the extended exergy accounting method to unify multiple criteria into homogeneous terms. The problem is formulated as a two-stage robust waste-to-energy facilities location model using robust optimization and mixed-integer linear programming techniques. A case study on household food waste treatment in Shanghai is used to demonstrate the proposed model. Several valuable insights into municipal solid waste management are revealed through sensitivity analysis.
Article
Thermodynamics
Hangyu Sun, Ziyi Yang, Guangqing Liu, Yi Zhang, Yen Wah Tong, Wen Wang
Summary: This study investigated the dual effects of real tar (RT) and synthetic tar (ST) on anaerobic digestion (AD). A mapping relationship between ST and RT was effectively built through an equivalent method. The Anaerobic Digestion Model No.1 (ADM1) was modified and extended by introducing kinetic parameters of tar, leading to an accurate simulation of methane production. The modified ADM1 could help in understanding the AD system both macroscopically and microscopically.
Article
Engineering, Environmental
Jie Li, Le Zhang, Chunxing Li, Hailin Tian, Jing Ning, Jingxin Zhang, Yen Wah Tong, Xiaonan Wang
Summary: This study utilized ensemble machine learning algorithms to predict and understand the anaerobic digestion (AD) system and developed a reversible design method. The critical factors influencing methane yield and content were identified and the computational results were experimentally validated in a real-world food waste AD process.
ACS ES&T ENGINEERING
(2022)
