Article
Environmental Sciences
Rajagopal Malolan, Ramesh Sai Jayaraman, Srikanth Adithya, Jayaseelan Arun, Kannappan Panchamoorthy Gopinath, Panneer Selvam SundarRajan, Omaima Nasif, Woong Kim, Muthusamy Govarthanan
Summary: This study introduces a zero emission concept for waste disposal and explores the potential for renewable green energy production by utilizing a mixture of cow dung and chicken waste for biogas production. The study evaluates the impact of different proportions of waste mixtures and the addition of Chlorella pyrenoidosa co-substrate on biogas distribution and production efficiency.
Article
Agricultural Engineering
Zahra Al Hasani, Jagdeep Kumar Nayak, Halima Alhimali, Abdullah Al-Mamun
Summary: The study found that the use of conductive additive GAC/nZVI in anaerobic digestion process can significantly increase the biogas production and methane generation, as well as improve the removal rate of COD.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Hao Jiang, Fan Wu, Yuchang Wang, Lu Feng, Hongjun Zhou, Yeqing Li
Summary: In-situ hydrogen biomethanation is a promising technology for upgrading biogas quality, and investigating its characteristics under different conditions is crucial for its effectiveness. The experiments showed that hydrogenotrophic methanogenesis performed better at thermophilic conditions, with the highest methane content obtained when H2 and CO2 were fed at a 4:1 ratio with Methanothermobacter as the dominant genus.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Sittichai Kulawong, Ritchard Artkla, Preecha Sriprapakhan, Pisit Maneechot
Summary: Biogas is a cheap, renewable, and eco-friendly alternative to fossil fuels. This study focuses on purifying biogas by adsorbing H2S using NaX and Ag-exchanged NaX zeolites, which has shown promising results in increasing methane yield.
BIOMASS & BIOENERGY
(2022)
Review
Environmental Sciences
Luong N. Nguyen, Jeevan Kumar, Minh T. Vu, Johir A. H. Mohammed, Nirenkumar Pathak, Audrey S. Commault, Donna Sutherland, Jakub Zdarta, Vinay Kumar Tyagi, Long D. Nghiem
Summary: Anaerobic co-digestion (AcoD) and biogas upgrade have enabled many wastewater treatment plants to become net energy producers. While water scrubbing is currently the most widely used technology, significant market growth in membrane separation has been observed, with further advancements in materials engineering and sciences expected to enhance membrane separation competitiveness in biogas upgrading.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Review
Agricultural Engineering
Amith Abraham, Hyojung Park, Okkyoung Choi, Byoung-In Sang
Summary: The world of bioplastics has rapidly expanded, generating new waste streams that pose challenges to waste processing; anaerobic co-digestion is considered the best option for efficient bioplastic waste processing with reduced space requirements and environmental pollution; the higher C/N ratio of bioplastics presents a challenge to anaerobic digestion, but co-digestion with lower C/N ratio biowastes can improve biogas production.
BIORESOURCE TECHNOLOGY
(2021)
Review
Agricultural Engineering
Suyun Xu, Zihao Qiao, Liwen Luo, Yongqi Sun, Jonathan Woon-Chung Wong, Xueyu Geng, Jing Ni
Summary: The advantages of anaerobic digestion (AD) technology in organic solid waste treatment for bioenergy recovery are globally recognized. Attention has shifted towards on-site biogas research and biogenic CO2 sequestration from AD plants to achieve "carbon neutral". Various CO2 bioconversion technologies within AD systems offer promising solutions for reducing greenhouse gas emissions and increasing renewable energy recovery.
BIORESOURCE TECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Sachankar Buragohain, Pinakeswar Mahanta, Kaustubha Mohanty
Summary: Anaerobic digestion of lignocellulosic biomass has been studied with duckweed, switchgrass, and rice straw under mesophilic conditions. Co-digestion at a 1:1 ratio yielded better results than other ratios, especially in community-scale biogas digesters. Daily biogas production was highest for digesters containing rice straw and cattle dung, showing potential for practical applications.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Review
Agricultural Engineering
Hang P. Vu, Luong N. Nguyen, Qilin Wang, Hao H. Ngo, Qiang Liu, Xiaolei Zhang, Long D. Nghiem
Summary: This review discusses technologies to remove hydrogen sulphide (H2S) during anaerobic digestion (AD). Post-treatment technologies have high removal efficiency but do not mitigate H2S toxicity. Input control reduces sulphur input but has lower removal efficiency. Microaeration for regulating the redox potential is a promising alternative with high removal efficiency and low operational cost.
BIORESOURCE TECHNOLOGY
(2022)
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
Energy & Fuels
Tawanda Kunatsa, Xiaohua Xia
Summary: This study introduced a novel methane-optimised biogas-liquid petroleum gas hybrid system, which increased the methane component of biogas by optimizing substrate mass and successfully filled the gap in gas demand.
Article
Agricultural Engineering
Matteo Palu, Maria Peprah, Panagiotis Tsapekos, Panagiotis Kougias, Stefano Campanaro, Irini Angelidaki, Laura Treu
Summary: This study investigates the effects of bioaugmentation on the co-digestion of cheese whey and manure in a continuous stirred tank reactor under in-situ biomethanation operations. The addition of Methanoculleus bourgensis in the mesophilic reactor resulted in a stable biomethanation process and increased methane production rate. On the other hand, the addition of Methanothermobacter thermautotrophicus in the thermophilic reactor did not improve biogas upgrading performance.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Hubert Prask, Malgorzata Fugol, Arkadiusz Dyjakon, Liliana Glab, Jozef Sowinski, Alena Whitaker
Summary: The research shows that blending high-fiber and low solid content sewage sludge with high-solid sorghum silage, sorghum pomace, and sorghum juice can improve the biogas generation process and increase biogas production. The mixture of sorghum juice and sewage sludge produces the highest amount of biogas and methane. Intelligent blending of alternative raw material with sewage sludge allows for similar biogas yields while maintaining a stable anaerobic digestion process.
Article
Biotechnology & Applied Microbiology
Fazel Ziaee, Nader Mokhtarani, Kasra Pourrostami Niavol
Summary: This study found that co-digestion of municipal solid waste and sawdust can improve methane production by adjusting the ratio and I/S ratio. Lower I/S ratios lead to fatty acid accumulation and acidic pH conditions. Increasing total solids content decreases biomethane yield while increasing biogas content.
Article
Green & Sustainable Science & Technology
Gerard Merlin, Jonathan Outin, Herve Boileau
Summary: The study showed that adding grease or whey can significantly increase methane production in co-digestion, but using septage as a co-substrate can have a negative impact on performance. Experimental results demonstrated good biodegradation efficiency, while modeling confirmed the importance of protein and lipid content for digester stability and methane production.
Article
Green & Sustainable Science & Technology
Junjie Li, Chunxing Li, Yanlin Li, Ruming Wang, Mingdian Zhou, Lixin Zhao, Xiaofang Pan, Guanjing Cai, Nan Lv, Jing Ning, Irini Angelidaki, Gefu Zhu
Summary: The use of iron/carbon as conductive materials in anaerobic digestion has shown to improve methane production and dichlorophenol removal efficiency in wastewater treatment. The formation of galvanic cells between iron and carbon plays a significant role in acidification and anaerobic digestion processes, promoting the optimization of microbial community composition.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Agricultural Engineering
Nan Lv, Guanjing Cai, Xiaofang Pan, Yanlin Li, Ruming Wang, Junjie Li, Chunxing Li, Gefu Zhu
Summary: The study showed that regulating pH and hydraulic retention time influenced the production of volatile fatty acids, providing guidance for enhancing targeted VFAs products through optimizing operational parameters or bio-augmentation.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Guanjing Cai, Junjie Li, Mingdian Zhou, Gefu Zhu, Yanlin Li, Nan Lv, Ruming Wang, Chunxing Li, Xiaofang Pan
Summary: This study investigated the bioaugmentation strategy of inoculating indole-3-acetic-acid (IAA)-producing bacteria to improve the growth-promoting effect of composting product. The results showed that bioaugmentation with IAA-producing bacteria significantly increased the IAA contents of composting products, promoting plant growth and development.
Article
Engineering, Environmental
Xingdong Wang, Victor Wei-Chung Chang, Zhiwei Li, Yang Song, Chunxing Li, Yin Wang
Summary: The study revealed that food waste digestate (FWD) as an additive can significantly reduce the heavy metal content in blended biochar, thereby improving its ecological risk index and phytotoxicity index.
Article
Green & Sustainable Science & Technology
Chunxing Li, Jie Li, Shengyu Xie, Guangyi Zhang, Lanjia Pan, Ruming Wang, Gang Wang, Xiaofang Pan, Yin Wang, Irini Angelidaki
Summary: In this study, a combination of hydrothermal treatment and alkaline hydrothermal treatment with pyrolysis was used to immobilize heavy metals in sewage sludge. The results showed that the heavy metals mainly remained in the hydrochar and biochar, and alkaline hydrothermal treatment combined with pyrolysis was particularly effective for immobilizing zinc and nickel. Additionally, the potential ecological risk of heavy metals in the sewage sludge-based biochar significantly decreased after treatment.
JOURNAL OF CLEANER PRODUCTION
(2022)
Review
Engineering, Environmental
Yao Zhang, Chunxing Li, Zengwei Yuan, Ruming Wang, Irini Angelidaki, Gefu Zhu
Summary: This review summarizes the roles of syntrophic bacteria and methanogens in the anaerobic digestion (AD) process, revealing the mechanisms of metabolism pathways, microbial characteristics, substrate oxidation, and electron transfer in syntrophic methanogenesis. The review also provides an overview of process control and optimization methods for improving the efficiency of syntrophic methanogenesis.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Xin Jia, Haiyang Lu, Yu Hui, Yuhui Zhang, Zhennan Han, Chao Wang, Xingfei Song, Guangwen Xu
Summary: Pyrolysis of Xiaolongtan lignite with and without CaSO4-containing coal ash premixed was conducted to investigate the impact of CaSO4 on ash during pyrolysis. The presence of CaSO4-rich coal ash significantly increased the yields of CO2, pyrolysis gas, and water, while decreasing the H2 yield above 750 degrees C. Ash analysis revealed that CaSO4 mainly transformed into CaS at these temperatures, while other ash components such as Fe2O3 remained relatively unchanged. Testing the reactions between simulated pyrolytic gas and coal ash further confirmed similar decreases in H2 and CO and increases in CO2 and water, indicating that the mechanism involved the transformation of CaSO4 into CaS. Additionally, studying the reactions between char and ash showed that carbon was oxidized by CaSO4 to form CO2.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Environmental Sciences
Shengyu Xie, Yu Wang, Chuan Ma, Gefu Zhu, Yin Wang, Chunxing Li
Summary: This study investigates the pyrolysis of antibiotic mycelial residue (AMR) at different temperatures and heating rates to produce valuable biochar for heavy metal immobilization. The results show that the decomposition of AMR involves three pseudo-reactions that fit a three-dimensional diffusion model. Increasing the pyrolysis temperature and heating rate reduces the yield and volatile matter content of the biochar, but increases the ash content, fixed carbon content, and aromaticity. The AMR-derived biochar demonstrates favorable fuel properties and stability against soil degradation, making it a valuable carbon resource.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Chemical
Yunsheng Gao, Zhentao Zhao, Yuxin Wang, Zhigang Zhang, Zizhen Yan, Guangwen Xu, Haiming Yu, Lei Shi
Summary: A strong basicity immobilized ionic liquid catalyst (PS-IMC4IM) was constructed to solve the difficulties of product separation and recycling in homogeneous catalysts. Various characterizations were conducted to evaluate the structure and active components of the catalyst. PS-IMC4IM displayed admirable catalytic performance in the transesterification reaction and showed excellent catalytic ability and stability.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Analytical
Yuhui Zhang, Xin Jia, Dengguo Lai, Zhennan Han, Xingfei Song, Chao Wang, Guangwen Xu
Summary: The impact of CO2 on the pyrolysis characteristics in reactor with internals was studied by conducting pyrolysis experiments of Yulin coal under N2 (inert) and CO2 (active) atmospheres in fixed-bed reactors for two types of pyrolysis, with and without internals. It was found that CO2 exhibited different effects on tar yield for the two types of pyrolysis, raising tar yield for pyrolysis in reactor without internals but lowering tar yield for that with internals. The tar yield under CO2 atmosphere with internals was 6.31 wt%, which was still 15.97% higher than that without internals at 1000 degrees C.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Energy & Fuels
Junrong Yue, Qingyue Xiao, Dawei Zhao, Yu Guan, Jiao Liu, Guangwen Xu
Summary: It is generally agreed upon that oxidative coupling of methane is structure-sensitive over La2O3 catalysts, and nanorod morphology, particularly La-PVP catalyst, exhibits the highest activity and selectivity.
Article
Engineering, Chemical
Zhenkun Xia, Jiajian Gao, Tengfei Zhang, Kangjun Wang, Fushan Chen, Guangwen Xu, Ziyi Zhong, Fabing Su
Summary: Inorganicsilicon compounds or products, such as silicon oxides(SiO2), metallurgical silicon (m-Si), silicon carbide (SiC),silicon halides (such as SiH n Cl4-n , n = 0-4 or SiX n , X = F, n = 2; X = Br, n = 4), silicon hydrides (SiH4 and Si2H6), nitrogen compounds (Si3N4),and the others (Si2Cl6 and Si2OCl6), have been remarkably developed in the past years. Understanding the thermodynamics of these reactions is crucial for optimizing reaction conditions and catalyst development. This study comprehensively investigates the thermodynamics of silicon-related reactions and provides valuable insights for industrial applications.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Review
Green & Sustainable Science & Technology
Wangliang Li, Rohit Gupta, Zhikai Zhang, Lixia Cao, Yanqing Li, Pau Loke Show, Sunil Kumar, Vijaya Kumar Gupta, Kun-Yi Andrew Lin, Sunita Varjani, Stephanie Connelly, Siming You
Summary: High-solid anaerobic digestion (HSAD) is an effective method for disposing of organic waste and mitigating climate change through bioenergy recovery. However, HSAD faces challenges such as low biogas and methane yields, slow reaction rates, and inhibition due to mixing limitations. This article critically reviews recent progress in HSAD, focusing on transport phenomena and process modeling. It discusses hydrodynamic phenomena, biokinetic mechanisms, reactor simulations, advanced reactor designs, industrial applications, and key parameters for sustained HSAD operation. Further research on novel materials and the development of a generic simulation tool are needed for improving HSAD efficiency and scalability.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Zhentao Zhao, Mingyu Liu, Yuxin Wang, Zizhen Yan, Guangwen Xu, Jianjun Guo, Lei Shi
Summary: This paper proposes a novel method to immobilize 1-ethyl-3-methylimidazole imidazolium ([Emim]Im) ionic liquids onto silica to synthesize solid catalysts. The research shows that [Emim]Im@SG-A12 exhibits the best catalytic performance with 49.0% DMC conversion and 39.0% EMC yield. The study also reveals that [Emim]Im efficiently promotes the hydrolysis of TEOS and enhances the transesterification of DMC with EtOH.
REACTION CHEMISTRY & ENGINEERING
(2023)
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)
