Article
Agricultural Engineering
Ombretta Paladino, Matteo Neviani
Summary: This study establishes the operational conditions of airlift photo-bioreactors (AL-PBRs) for Chlorella vulgaris cultivation in a pilot-scale Biowaste-to-Biofuels production plant, aiming for efficient utilization of waste resources in the production process.
BIOMASS & BIOENERGY
(2021)
Article
Environmental Sciences
Kaiyue Huo, Siqi Wang, Wanwan Zhao, Hongfu Guo, Weini Xiong, Ruihua Liu, Chao Yang
Summary: In this study, the first engineered DCA-mineralizing strain KTU-P8DCA was constructed by enhancing pathway expression with a strong promoter P8 in the biosafety strain Pseudomonas putida KT2440. Strain KTU-P8DCA exhibited superior tolerance to high concentrations of DCA and showed excellent genetic stability in continuous passage culture. This research has significant implications for the bioremediation of sites heavily contaminated with DCA.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Energy & Fuels
Fahime Mosadegh Ranjbar, Mohsen Karrabi, Bahar Shahnavaz
Summary: The study investigated the potential for biogas production from the co-digestion of lignocellulosic biomass (wheat straw) with cattle manure. The findings showed that the highest biogas production was achieved under specific conditions, and it was influenced by the volatile solids content of wheat straw and the inoculum-to-substrate ratio.
Article
Engineering, Environmental
Yuekai Xie, Jianfeng Xue, Carthigesu T. Gnanendran, Karyn Xie
Summary: This study investigates the long-term effects of compaction, recirculation and temperature on the properties of biodegraded municipal solid waste. Results show that leachate recirculation enhances settlement and methane generation. Temperature affects the biocompression ratio, with lower dry unit weights being more sensitive. Settlement is primarily completed within 25% degrees of biodegradation.
Article
Biotechnology & Applied Microbiology
Dayana P. Meneses, Livia Maria N. Paixao, Thatyane Fonteles, Eduardo J. Gudina, Ligia R. Rodrigues, Fabiano A. N. Fernandes, Sueli Rodrigues
Summary: Aureobasidium pullulans URM 7059 produced esterase using residual glycerol from biodiesel as the sole carbon source. The enzyme exhibited stability at neutral pH and temperatures below 30 degrees C. The airlift reactor operating at the highest air flow rate increased the enzyme productivity by 3-fold compared to shake-flask experiments, suggesting potential for remediation processes.
BIOCHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Qizheng Cai, Yaoqiang Zhang, Yunsong Zheng, Yang Liu, Songhu Yuan
Summary: This study demonstrates a groundwater circulation enhanced electrobioremediation process that effectively stimulates the biological degradation of 1,2-DCA in heterogeneous aquifers.
ENVIRONMENTAL ENGINEERING SCIENCE
(2022)
Article
Materials Science, Paper & Wood
Soojin Kwon, Marielis C. Zambrano, Joel J. Pawlak, Richard A. Venditti
Summary: This study extensively examined the aquatic biodegradation of wood pulp and lignocellulosic components, revealing that cellulose and hemicellulose are readily biodegradable while lignin is not. The presence of lignin in fibers also reduced the biodegradability of other components. Additionally, ash and extractives were found to have a negative impact on biodegradability.
Article
Chemistry, Multidisciplinary
Xuege Gu, Junfeng Li, Xueting Feng, Wenying Qu, Wenhuai Wang, Jiankang Wang
Summary: In this study, an airlift-electrocoagulation (AL-EC) reactor was developed for the removal of norfloxacin (NOR) from water. The effects of six parameters on NOR removal were investigated, and the possible mechanism was proposed based on flocs characterization and intermediates analysis. The performance of the AL-EC reactor in treating different antibiotics and removing NOR from various types of water was also evaluated. The results showed that the AL-EC reactor achieved efficient and cost-effective removal of NOR from water, with a removal rate exceeding 60% for different antibiotic concentrations in both artificial and real water samples.
Article
Engineering, Chemical
Muthamilselvi Ponnuchamy, V Saravanan, P. Balamurugan, R. Rajeshkannan, M. Dilipkumar
Summary: This study investigated the elimination of chlorophenol by Aspergillus fumigatus in an ALBR. The results showed that the removal efficiency was higher at lower peptone concentration. The bioreactor displayed a high elimination rate under specific EBRT, initial chlorophenol concentration, and peptone concentration.
DESALINATION AND WATER TREATMENT
(2022)
Article
Biotechnology & Applied Microbiology
Ali Assadi, Roya Alimoradzadeh, Hossein Movahedyan, Mohammad Mehdi Amin
Summary: This study investigated the microbial and biodegradation kinetics of acclimated-mixed sludge to 4-chlorophenol in an aerobic sequencing batch reactor. The biodegradation kinetics were predicted accurately using the Haldane formulae. However, pure strains isolated from mixed sludge did not show higher 4-CP-removal efficiency due to the presence of an intermediate meta-cleavage product.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Multidisciplinary
Ganlu Li, Kequan Chen, Yanpeng Wei, Jinlei Zeng, Yue Yang, Feng He, Hui Li, Pingkai Ouyang
Summary: Compared with conventional cylinder airlift bioreactors, a novel rectangular dynamic membrane airlift bioreactor that produces fine bubbles has shown improved mass transfer, gas holdup, and bioprocesses in batch and continuous fermentation. The dynamic membrane aeration in the airlift bioreactor results in higher volumetric oxygen mass transfer coefficient, leading to higher biomass, RNA yield, and substrate utilization in batch fermentation. In continuous fermentation, the dynamic membrane airlift bioreactor also demonstrates advantages in terms of biomass accumulation, RNA concentration, and dilution rate.
Article
Environmental Sciences
Tania Gutierrez-Macias, Petia Mijaylova Nacheva, Alberto Esquivel-Sotelo, Liliana Garcia-Sanchez, Edson Baltazar Estrada-Arriaga
Summary: Pharmaceutical compounds are emerging pollutants that can potentially affect the quality of water bodies, ecosystems, and human health. This study assessed the removal mechanisms of two lipid regulator pharmaceutical compounds, clofibric acid (CLA) and gemfibrozil (GFZ), through batch experiments using activated sludge obtained from a membrane bioreactor (MBR). The results showed that biodegradation was the main removal mechanism for both pharmaceutical compounds, followed by sorption and desorption.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Engineering, Environmental
Bishnu Bhattarai, Davide Dionisi, Waheed Afzal
Summary: This study investigated the aerobic biodegradation of paracetamol as sole carbon and energy source and found that it had a slower degradation rate and longer acclimation time compared to glucose, although it could be fully degraded at all concentrations. The microbial growth on paracetamol was characterized by lower maximum specific growth rate, slightly higher growth yield, and higher time constant for acclimation, compared to glucose.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Domenica Mosca Angelucci, M. Concetta Tomei
Summary: This study evaluated the performance of a two-phase tubing bioreactor using an extractive polymeric membrane to selectively transfer and biologically remove the toxic fraction of a landfill leachate. The bioreactor effectively separated the biomass from the polluted stream, reducing the inhibitory/toxic effects caused by the leachate constituents. By optimizing the process conditions, including decreasing hydraulic retention times (HRTs) and increasing organic loading rates (OLRs), excellent removal efficiencies (88-99%) were achieved. The bioreactor demonstrated stable performance and the capability to recover valuable leachate constituents.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Chemical
Hajar Delavar, Abbas Naderifar
Summary: This study presents the kinetic model of ethylene oxidation over a commercial selective catalyst, aAl(2)O(3)/Ag-Cs-Re, for the first time. The results indicate that both partial and complete oxidation of ethylene occur through surface reactions, with the partial oxidation requiring additional active sites. The surface reaction is the rate-limiting step under the experimental conditions.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Environmental
Xingxing Hu, Lingjie Liu, Yanmeng Bi, Lu Li, Chunsheng Qiu, Jingjie Yu, Shaopo Wang
Summary: In this study, the impact of exogenous folate on the start-up process of single-stage partial nitritation-anammox (SPNA) was evaluated using two lab-scale reactors. The results showed that folate addition can enhance nitrogen removal rate, extracellular polymeric substances production, hydrazine oxidase and dehydrogenase activity, as well as the relative abundance of Candidatus Brocadia.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Shaocang He, Tingting Shen, Jing Sun, Haoqi Pan, Chenxu Sun, Tianpeng Li, Runyao Li, Enshan Zhang
Summary: A novel process of acid leaching neutralization was developed for the preparation of inorganic polymeric composite ferric aluminum silicate coagulant (CFAS) using solid waste coal gasification coarse slag (CGCS). The optimized preparation process was determined through single-factor experiment and the performance of CFAS was evaluated for domestic sewage treatment. The results showed that CFAS exhibited excellent coagulation ability and achieved significant removal efficiency for turbidity, ammonia nitrogen, and chemical oxygen demand.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kinga Szatmari, Sandor Nemeth, Alex Kummer
Summary: In this article, a resilience-based reinforcement learning approach is proposed to address the potential thermal runaway issue in batch reactors. By calculating the resilience metric for reactors and utilizing Deep Q-learning to decide when to intervene in the system, resilient-based mitigation systems can be effectively developed.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingyou Jiang, Qi Yao, Mingqing Su, Jingjing Li, Kunlun Lu, Dawei Ding, Han Hong
Summary: This study investigates the inhibitory characteristics and mechanisms of ABC powder on coal powder explosion. The addition of ABC powder significantly decreases the maximum explosion pressure and can completely suppress coal dust explosions. The study also reveals the thermal decomposition characteristics and reaction kinetics of the mixed system.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kubilay Bayramoglu, Mustafa Nuran
Summary: This study examines the feasibility of using pyrolytic oil from waste tires as fuel in diesel engines, and evaluates its energy, exergy, and sustainability. The results indicate that pyrolytic oil has potential as a renewable fuel source with relatively high thermal efficiency.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Xinru Duan, Yejia Lv, Jiaxing Hong, Jianzhong Wu, Jia Zhang, Yang Yue, Guangren Qian
Summary: This study successfully prepared a tube reactor with optimized catalyst formula, which showed good performance in removing dioxins and other pollutants in the experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Jiaoyang Du, Xueming Dang, Xiaorong Gan, Xin Cui, Huimin Zhao
Summary: In this study, a photocatalyst-enzyme hybrid system was constructed, which solved the issue of enzyme inactivation caused by high concentration of H2O2 through photocatalytic in-situ H2O2 production, and improved the stability and catalytic efficiency of the enzyme. The effectiveness of the system in treating phenolic EDCs was confirmed through experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Fu-Rong Xiu, Longsheng Zhan, Yingying Qi, Xinyue Lei, Jiali Wang, Haipeng Zhou, Wenting Shao
Summary: This study developed a synergetic and high-efficiency treatment of waste tantalum capacitors (WTCs) and polyvinyl chloride (PVC) using subcritical water process. The treatment significantly reduced the temperature and reaction time for metal tantalum recovery from WTCs, and improved the dechlorination efficiency of PVC. The optimized conditions resulted in 100% resin conversion efficiency of WTCs and 97.39% dechlorination efficiency of PVC. The interaction between decomposition products of WTCs and PVC produced a high level of benzoic acid.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingda Li, Jiaming Song, Yuting Li, Chaoying Meng, Shuxian Wang, Linghao Zong, Honggang Ye, Yishuai Jing, Feng Teng, Peng Hu, Haibo Fan, Guangde Chen, Xin Zhao
Summary: CdPS3 nanosheets, especially those exfoliated by sodium cholate, have shown highly efficient photocatalytic degradation performance. The strong dark adsorption and dye-sensitized photocatalytic properties of CdPS3 nanosheets contribute to high degradation efficiencies of various pollutants.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Dongxu Ouyang, Yimei Pang, Bo Liu, Zhirong Wang
Summary: This study investigates the thermal runaway features of lithium-ion cells under tunnel conditions, considering different states of charge and tunnel ceilings. The results show that the tunnel visibility is affected by the smoke generated during thermal runaway, and the shape of the tunnel ceiling influences the temperature rise differently.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)