Article
Environmental Sciences
Xinxing Zhang, Chunjing Liu, Wenhua Liao, Shanshan Wang, Weitao Zhang, Jianzhi Xie, Zhiling Gao
Summary: This study conducted a comprehensive meta-analysis to evaluate the differences in separation efficiencies of various solid-liquid separation technologies and their impact on gas emissions during on-farm slurry storage. The results showed that centrifugation had the highest separation efficiency and resulted in greater reductions in greenhouse gas emissions, particularly methane.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agricultural Engineering
Weilin Wu, Ruying Li
Summary: Temperature and voltage are critical factors in microbial electrolysis cells (MECs) for antibiotic removal. It was found that a thermophilic MEC operating at 55 degrees C and 0.8 V achieved the highest antibiotic removal efficiency of 58.7%. This was attributed to increased bioelectrochemical and microbial activity, facilitating solid-liquid migration and having a significant positive correlation with antibiotic removal. Geobacter and Thermincola were dominant bacteria in the anode biofilms of mesophilic and thermophilic MECs, respectively.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Chemical
David Speer, Tirth Patel, Brian Ho, Jack Phillips, Tianyang Zhu, Joseph Shangraw, Meltem Urgun-Demirtas, Yanna Liang, Anish Tuteja
Summary: In 2018, the US landfilleds 35.3 million tons of food waste, accounting for 24% of the total landfill mass. Some states have started to ban or discourage the disposal of food waste and sewage sludge into landfills due to their negative impacts on the environment and human health. This has created an urgent need for the development of digestion processes to convert food waste into valuable chemical products.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Dandan He, Jun Xiao, Dongbo Wang, Xuran Liu, Qizi Fu, Yifu Li, Mingting Du, Qi Yang, Yiwen Liu, Qilin Wang, Bing-Jie Ni, Kang Song, Zhe Cai, Jun Ye, Haitao Yu
Summary: By refluxing digestion liquid into waste activated sludge pre-treatment unit, a significant increase in methane production from anaerobic digestion of waste water can be achieved. Biodegradable organics in the digestion liquid do not affect the anaerobic digestion process, but can enhance methane production through reutilization.
Article
Green & Sustainable Science & Technology
Henrik B. Moller, Peter Sorensen, Jorgen E. Olesen, Soren O. Petersen, Tavs Nyord, Sven G. Sommer
Summary: Anaerobic digestion can reduce greenhouse gas emissions from livestock manure and produce biogas as a substitute for fossil energy. Different scenarios show reductions in GHG emissions ranging from 65 to 105 kg CO2-eq ton(-1) biomass.
Article
Energy & Fuels
Siswo Sumardiono, Bakti Jos, Agata Advensia Eksa Dewanti, Isa Mahendra, Heri Cahyono
Summary: Agricultural waste, such as coffee pulp and chicken feathers, can be utilized for biogas production. Adjusting the total solids percentage and carbon to nitrogen ratio can increase biogas production, while delignification pretreatment aids in substrate decomposition, leading to faster COD reduction and biogas conversion. The Gompertz model demonstrates that varying the total solids percentage can impact biogas production, and that biogas production is higher with delignification pretreatment.
Article
Agricultural Engineering
Qiuping Zhang, Jifei Xu, Xiujun Wang, Wenbo Zhu, Xiaoke Pang, Ji Zhao
Summary: The study explored changes and distributions of antibiotic resistance genes (ARGs) in the liquid and solid fractions during anaerobic digestion of dairy manure. It found that ARGs were enriched in the solid fraction after digestion, with high total solids promoting their enrichment. Increased abundances of certain bacterial genera were responsible for the enrichment of most ARGs in the solid fraction.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Physical
Qian Zhang, Yongzhong Jia, Jinhe Sun, Pengrui Zhang, Chaochi Huang, Mingyong Wang, Zixuan Xue, Ciming Wang, Fei Shao, Fengtai Tong, Yilin Xiao, Yan Jing
Summary: A new liquid-liquid extraction system was studied for the selective separation of lithium isotopes, achieving a maximum single-stage separation factor of 1.025. The lithium crown ether complex has a 1:1 complexation ratio, and lowering the temperature is beneficial for increasing the separation efficiency.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Green & Sustainable Science & Technology
Siswo Sumardiono, Gebyar Adisukmo, Muthia Hanif, Budiyono Budiyono, Heri Cahyono
Summary: The study indicates that controlling the particle size of solid sago waste, biological pretreatment, NaOH pretreatment, and the ratio between solid sago waste and cow rumen can improve biogas production rate, with the 1:1 ratio showing the best results.
Review
Environmental Sciences
Himanshu K. Khuntia, Aastha Paliwal, D. Ravi Kumar, H. N. Chanakya
Summary: The sustainable management of organic solid wastes, particularly municipal solid waste (MSW), is crucial for achieving various sustainable development goals (SDGs). Solid-state anaerobic digestion (SSAD) is a biomethanation process that offers advantages over conventional anaerobic slurry digesters, such as smaller footprint, lower freshwater consumption, and simpler upstream and downstream processes. This review critically assesses different aspects of SSAD, including bioreactor design, operational strategy, process performance, microbial ecology, applications, and mathematical models. The evaluation revealed various challenges and factors influencing the success of SSAD, such as process failures and the role of microbial acclimatization in enhancing performance.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Green & Sustainable Science & Technology
Alun Scott, Richard Blanchard
Summary: This study reveals that despite significant success in capturing CH4 and carbon dioxide as biogas and preventing N2O emissions, gains made can be lost in a subsequent process, negating some or all of the advantage. Additionally, the process of extracting value from the captured resource is discussed in light of current farm parameters together with indications of other potential revenue streams.
Article
Thermodynamics
Phurba Tamang, Vinay Kumar Tyagi, Neelam Gunjyal, Ali Mohammad Rahmani, Rajesh Singh, Pradeep Kumar, Banafsha Ahmed, Pooja Tyagi, Rajesh Banu, Sunita Varjani, A. A. Kazmi
Summary: This study presents a novel free nitrous acid (FNA) pretreatment to enhance the biomethanation of wheat straw. The results showed that FNA pretreatment can effectively improve the biogas yield from wheat straw, and even co-digestion could achieve enhanced biogas yield over mono-digestion.
Article
Engineering, Environmental
Angelica Guerrero Calderon, Haoran Duan, Xiaoguang Chen, Ziping Wu, Wenbo Yu, Carlos E. Silva, Yijing Li, Sohan Shrestha, Zhiyao Wang, Jurg Keller, Zhongwei Chen, Zhiguo Yuan, Shihu Hu
Summary: The study found that Free Nitrous Acid (FNA) pre-treatment can effectively improve anaerobic digestion (AD) performance under different concentrations and durations, with the optimal condition being FNA concentration of 7.2 mgN/L and treatment duration of 24 hours. Changes in microbial communities supported the observation of enhanced sludge degradation with increasing FNA concentrations, but there were inconsistencies between short-term solubilization results and long-term AD performance.
Article
Engineering, Environmental
Jose A. Contreras, Edgardo I. Valenzuela, Patricia Bovio-Winkler, Claudia Etchebehere, Carmen Gabaldon, Guillermo Quijano
Summary: The anaerobic oxidation of methane coupled to denitrification (N-AOM) is a promising biotechnology for reducing the environmental impact of anaerobic effluents. In this study, a continuous N-AOM reactor was used to evaluate its performance, achieving methane elimination capacity values of 20-39 g m -3h- 1 with NO3- as the electron acceptor, and 48-61 g m -3h- 1 with a mixture of NO3- and NO2-. The pH value was found to be a critical factor influencing the process. Metagenomic analysis revealed potential metabolic mechanisms involved in N-AOM.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
S. Connolly, V. O'Flaherty, D. J. Krol
Summary: Cattle slurry storage is a significant contributor to global methane and ammonia emissions. A study investigated the effectiveness of an oxygen-based amendment in reducing these emissions. Various peroxide sources were tested, and an amendment consisting of hydrogen peroxide and potassium iodide was found to successfully reduce methane emissions. While other peroxide sources reduced methane emissions, they also increased pH and subsequently ammonia emissions. The hydrogen peroxide and potassium iodide amendment achieved a 63% reduction in methane emissions and should be considered for larger scale implementation.
JOURNAL OF CLEANER PRODUCTION
(2023)