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Multivariate Insights into Enhanced Performance in Two-Phase High Solid Anaerobic Digestion of Food Waste Via Conductive Materials: Substance Conversion, Microbial Communities, and Metagenomic Analyses

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SSRN 2024年

作者： Wang, Xinzi Chen, Xiteng Sun, Yaya Fan, Weijie Zuo, Xiaoyu Fang, Xiang Liu, Rufei Li, Xiujin Yuan, Hairong State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing100029 China Jiangsu Key Laboratory of Anaerobic Biotechnology School of Environment and Civil Engineering Jiangnan University Jiangsu Province Wuxi214122 China School of Mechanical and Automotive Engineering Shanghai University of Engineering Science 333 Longteng Road Songjiang Shanghai201620 China Cucde Environmental Technology Co. Ltd. No.36 Deshengmenwai Street Xicheng District Beijing100120 China Beijing Technology and Business University China

This study investigated the effects of conductive materials addition in two-phase high solid anaerobic digestion (AD) of food waste (FW), in which zero-valent iron (ZVI) was added to the acidogenic reactor (AR), and activated carbon (AC) was added to methanogenic reactor (MR). In AR, ZVI addition improved the relative abundance of Glycoside Hydrolases, which stimulated the generation of acetic acid and butyric acid. In MR, the highest daily methane yield of MR_1 and 2 with AC addition reached 3.23 L/g VS and 2.88 L/g VS, 1.43 and 0.85 folds higher than 1.56 L/g VS of the control, respectively. Microbial community analysis indicated that adding AC optimized the dominant methanogenic archaea from Methanoculleus to Methanosarcina. Especially, the manual reconstruction of specific metabolic pathways revealed that adding conductive materials made great influence on the core process of hydrolysis acidification process and methane production. Therefore, conductive materials supplement could be one of effective methods in improving two-phase high solid AD performance of FW. © 2024, The Authors. All rights reserved.

关键词： Anaerobic digestion

Insight into the Role of Heterogeneous Fenton-Like Catalyst Feco-Γ-Al2o3 with Dual Electron-Rich Centers for Ni-Edta Removal

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SSRN 2023年

作者： Zhao, Zilong Qi, Shuyu Zhou, Jianli Ren, Yatao Zheng, Kaiyun Zhang, Jin Dong, Wenyi Wang, Hongjie School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Shenzhen518055 China School of Science Harbin Institute of Technology Shenzhen Shenzhen518055 China Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control Shenzhen518055 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China Shenzhen518055 China

To enhance the polarization distribution of electron cloud density on the catalyst surface, we have introduced a novel bimetallic-substituted dual-reaction center (DRC) catalyst (FeCo-γ-Al2O3) comprising iron (Fe) and cobalt (Co) for the decomplexation and mineralization of heavy metal complex Ni-EDTA in this study. Compared to the catalysts doped solely with Fe or Co, the bimetal-doped catalyst offered several advantages, including increased BET-specific surface area, enhanced electron cloud polarization distribution, additional electron transfer pathway, and improved capacity of free radical generation. Through DFT calculations and EPR tests, we have elucidated the influences of the catalyst's adsorption toward Ni-EDTA and its decomplexation products on the electron transfer between the pollutant and the catalyst. The competition between the pollutants and H2O2 affects the generation of free radical in both electron-rich and electron-deficient centers. Building on these findings, we have proposed a plausible removal mechanism of Ni-EDTA using the heterogeneous Fenton-like catalyst FeCo-γ-Al2O3. This study sheds light on the potential of FeCo-γ-Al2O3 as a DRC catalyst and emphasizes the significance of pollutant characteristics in determining the catalyst’s performance. © 2023, The Authors. All rights reserved.

关键词： Catalysts

Resilience Assessment of Subway System to Waterlogging Disaster

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SSRN 2024年

作者： Xu, Fei Fang, Delin Chen, Bin Wang, Hao State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing100875 China Faculty of Geographical Science Beijing Normal University Beijing100875 China State Key Joint Laboratory of Environmental Simulation and Pollution Control China Faculty of Architecture Civil and Transportation Engineering Beijing University of Technology Beijing100124 China

The subway system is experiencing significant challenges from waterlogging due to climate change and urbanization, and the enclosed underground structure of the system makes this issue worsen. This study proposed a "Stability-Resistance-Recovery" assessment framework focused on subway system waterlogging resilience (SSWR) based on the system performance curve. This framework considered various factors, including the inundation situation simulated by hydrological model, natural environment, subway information, and sociodemographic information. A case study in Beijing showed that the stability and resistance were the leading factors affecting the SSWR. Among all the indexes, water bodies surface percentage, evening peak departure time interval, and population density had the strongest impacts on the SSWR. Generally, the subway system exhibited a relatively low level of waterlogging resilience, with 51.9% of stations indicating very low or low levels, mainly distributed on subway lines 1, 2, 4, 5, 7, 9, and 10. Stations at medium SSWR were dispersed throughout the areas neighboring stations at very low or low SSWR. Stations at very high or high SSWR were minimal and scattered in peripheral areas. This study identifies the resilience level of subway stations and provides theoretical support for decision-makers to allocate waterlogging prevention and recovery resources for subway system. © 2024, The Authors. All rights reserved.

关键词： Recovery

Decadal changes of the intraseasonal oscillation during 1979–2016

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Advances in Climate Change Research 2021年第6期12卷 772-782页

作者： WU Nan LI Ying LI Juan FENG Li-Cheng LIU Fei Earth System Modeling and Climate Dynamics Research Center Nanjing University of Information Science and TechnologyNanjing210044China Shanghai ZhongChuan NERC-SDT Co. LtdShanghai201114China National Marine Environmental Forecasting Center Ministry of Natural ResourcesBeijing100081China Key Laboratory of Marine Hazards Forecasting National Marine Environmental Forecasting CenterMinistry of Natural ResourcesBeijing100081China School of Atmospheric Sciences Sun Yat-sen University Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studiesand Southern Marine Science and Engineering Guangdong LaboratoryZhuhai519082China

The Intraseasonal Oscillation (ISO) is the cornerstone for 2–8-week subseasonal prediction. Understanding the decadal variation of the ISO is important for improving subseasonal prediction;however, there is still a gap in our knowledge of ISO dynamics. Here, we presented a method, an Empirical Orthogonal Function (EOF) analysis of 11-year-sliding ISO evolution, to objectively detect decadal variation of the ISO originated from the equatorial Indian Ocean (EIO) during 1979–2016. The results show that the properties of ISO have a notable decadal change since 1998 for both boreal summer and boreal winter seasons, mainly in its evolution rather than in its intensity at origin. During the pre-1998 epoch, the boreal summer intraseasonal oscillation (BSISO), was confined to the Indian Ocean;since 1998, however, it propagated northeastward across the Maritime Continent (MC) and the intraseasonal variability over the western North Pacific was significant enhanced. On the other hand, the boreal-winter ISO, usually known as Madden-Julian Oscillation (MJO) shows minor changes in MC ‘barrier effect’ between the two epochs, and continuously propagates eastward across the MC. The MJO only shows suppressed activity over the central equatorial Pacific in the post-1998 epoch. These decadal changes are related to the eastern Pacific cooling during the ‘global warming hiatus’ period rather than to the four-decade global warming. Results here provide a set of potential precursors for foreseeing ISO propagation under different mean states.

关键词： Decadal variation Intraseasonal oscillation Madden-Julian oscillation Boreal summer intraseasonal oscillation Global warming hiatus

Variations of Ground Surface Albedo and its Influence on the Photolysis Rates of No2 in a Typical Urbanized Area of Shanghai

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SSRN 2024年

作者： Xiu, Guangli Duan, Yusen Fu, Qingyan Zhang, Kun Wang, Qian Xiao, Linhong Xiao, Yu Huo, Juntao Yang, Fan Meng, Chen State Environmental Protection Key Lab of Environmental Risk Assessment and Control on Chemical Processes School of Resources and Environmental Engineering East China University of Science and Technology Shanghai200237 China Shanghai Environmental Protection Key Laboratory for Environmental Standard and Risk Management of Chemical Pollutants School of Resources and Environmental Engineering East China University of Science and Technology Shanghai200237 China Shanghai Technology Center for Reduction of Pollution and Carbon Emission Shanghai200235 China Australia-China Center for Air Quality Science and Management Australia Shanghai Academy of Environmental Sciences Shanghai200233 China Shanghai University Shanghai200444 China 3Clear Technology Co. Ltd. Beijing100029 China Shanghai Environmental Monitoring Center Shanghai200235 China School of Geographic Sciences East China Normal University Shanghai200241 China Pudong New Area Environmental Monitoring Station Shanghai200135 China

Photolysis reactions are commonly regarded as the initial reaction of atmospheric chemistry. The photolysis of NO2 is a crucial reaction contributing to ozone pollution within the planetary boundary *** rate of NO2 photolysis depends on factors such as solar actinic flux, the absorption cross-section of NO2, and the quantum yield of the resulting photodissociation products. Ground surface albedo has the potential to amplify the overall J(NO2) value and enhance photochemical reactions. Research conducted at the PUDONG supersite, situated in a downtown areas surrounded by urban structures, revealed an average ground surface albedo of J(NO2) to be 0.146±0.028. This albedo was observed to increase with higher solar zenith angles, surpassing 0.20 when the solar zenith angle exceeded 45°, values notably higher than the parameter utilized in the CAMx model(0.08).The reflection of solar UV radiation by the ground surface can stimulate ozone formation by boosting the photolysis of NO2. Modeling results from F0AM during a typical ozone episode indicated that the average increments in daily maximum ozone concentration were 7.21%,14.52% and 21.91% for albedos of 0.10, 0.15 and 0.20, respectively, compared to albedo of 0.05. WRF-CAMx simulations demonstrated a significant increase in daily maximum ozone concentration with the expansion of urban ground surfaces from 1990 to 2020, highlighting the substantial impact of rising ground surface albedo on exacerbating ozone pollution. © 2024, The Authors. All rights reserved.

关键词： Ozone

Effects of Optimized Operating Parameters on Combustion Characteristics and NO_(x)Emissions of a Burner based on Orthogonal Analysis

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Journal of Thermal science 2021年第4期30卷 1212-1223页

作者： XU Qian AKKURT Nevzat YANG Gang ZHU Lidong SHI Kejian WANG Kang ZOU Zhenwei LIU Zhihui WANG Jiulong DU Zhiwei School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory for Energy Conservation and Emission Reduction for Metallurgical Industry Beijing 100083China Department of Mechanical Engineering Munzur UniversityTunceli 62000Turkey Department of Big Data Technology and Application Development Computer Network Information CenterChinese Academy of SciencesBeijing 100190China AVIC Xinxiang Aviation Industry(group)CO. LTDHenan 453002China

To optimize the structure of the burner,improve the combustion performance,and reduce the emission of NO_(x),a self-circulating low NO_(x)combustion technology was used to design a new type of flue gas self-circulating low NO_(x)*** on previous research on the numerical model of combustion and the composition of mixed gas on combustion and NO_(x)emissions,the effect of various factors on the ejection coefficient of the flue gas self-circulating structure was analyzed using the orthogonal test method,and the burner operating parameters,such as preheating temperature and excess air coefficient,were deeply studied through the three-dimensional finite element numerical model in this *** results show that the diameter ratio of the nozzle and the length of the cylindrical section of the flue gas self-circulating structure have great influence on its ejection and mixing *** optimal ejection coefficient was ***,the amount of NO_(x)emissions greatly increased from 6.23×10^(-6)(volume fraction)at the preheating temperature 973 K to 3.5×10^(-3)at preheating temperature 1573 *** the excess air coefficient decreased from 1.2 to 1,the maximum combustion temperature decreased from 2036.3 K to 1954.22 K,and the NO_(x)emissions decreased from 352.29×10^(-6)to 159.73×10^(-6).

关键词： preheating temperature excess air coefficient self-circulating flue gas low oxygen combustion low-NO_(x)emissions

Exposure, Spatial Distribution, and Health Risks of Perfluoroalkyl Acids in Commercial Fish Species in the Beibu Gulf

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SSRN 2024年

作者： Li, Jintao Sun, Jiachen Chao, Le Chen, Jingrui Huang, Liangliang Kang, Bin Key Laboratory of Mariculture Ocean University of China Ministry of Education Qingdao China Fisheries College Ocean University of China Qingdao China College of Marine Life Science Ocean University of China Qingdao China College of Environmental Science and Engineering Guilin University of Technology Guilin541000 China

The global distribution, persistence, bioaccumulation, and toxicity of per- and polyfluoroalkyl substances (PFAS) have received significant attention. In this study, we determined the contents of major perfluoroalkyl acids (PFAAs) in various commercial fish species from different regions of the Beibu Gulf. We detected 14 out of 17 PFAAs across all species, with PFOS showing the highest detection rate, followed by PFHxS, PFPeA, and PFTrDA. The concentrations of ∑PFAAs ranged from 0.22 to 7.43 ng/g (ww). Additionally, PFCAs dominated the PFAA profile (70%) in the southern Beibu Gulf in comparison with the northern (53%) and central Beibu Gulf (48%). PFOS was the most abundant compound, accounting for 41% of total PFAAs, followed by PFUdA (14 %) and PFOA (12%). The estimated daily intakes and hazard ratios of PFOS and PFOS indicate that there is no significant health risk from consumption of these fish by local populations. © 2024, The Authors. All rights reserved.

关键词： Biotic

Heat Transfer Characteristics in Tunnel Lining Heat Exchangers Under Circumferential and Axial Laying Schemes

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SSRN 2023年

作者： Zhang, Xuexiang Ji, Chengfan Ji, Yongming Hu, Songtao School of Environmental and Municipal Engineering Qingdao University of Technology Shandong Province Qingdao266033 China School of Architecture Harbin Institute of Technology Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology Harbin China

The subway source heat pump system (SSHPS) with tunnel lining capillary heat exchangers (CHEs) is an effective technology for mitigating thermal degradation in subway tunnels. However, previous studies lack comparative analysis of CHEs performance under different laying schemes, leading to suboptimal operational performance in practical engineering. A numerical model of tunnel lining CHEs was developed using ANSYS, based on a demonstration project of SSHPS in Qingdao. Based on the validated model, a comparison was made between the heat transfer characteristics of CHE under circumferential and axial laying schemes. The simulation results show that the heat transfer characteristics of CHEs vary with the laying length in circumferential and axial schemes. For laying lengths up to 4 m, both heat transfer per unit length (Q) and thermal transfer efficiency (Φ) of CHEs are higher in circumferential laying compared to axial laying. However, for laying lengths equal to or exceeding 6 m, this trend is reversed. This study can serve as a valuable reference for tunnel lining CHE design in practical engineering. © 2023, The Authors. All rights reserved.

关键词： Heat pump systems

Numerical Simulation of the Hydrodynamic Characteristics of the Porous I-type Composite Breakwater

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Journal of Marine science and Application 2022年第1期21卷 140-150页

作者： Yongzhou Cheng Zhiyuan Lin Gan Hu Xing Lyu School of Hydraulic and Environmental Engineering Changsha University of Science&TechnologyChangsha 410114China Key Laboratory of Water-Sediment Sciences andWater Disaster Prevention of Hunan Province Changsha 410114China

Based on the three-dimensional Reynolds-averaged Navier-Stokes equation with the closure of renormalization group k-εturbulence model and volume of fluid method,a wave-breakwater interaction numerical flume was developed to examine the wave-structure interaction of the porous I-type composite(PITC)*** transmission and reflection coefficients of the breakwater at different wave steepness H/L are quantitatively analyzed,and the wave-dissipating performance of the breakwater is *** changing the submerged depth of the breakwater,the velocity field,and vorticity field in the wave propagation process are analyzed,and the optimal working water depth of the new breakwater is *** results show that the vertical wave force on the PITC breakwater is greater than the horizontal wave *** addition,during the wave dissipation process,the transverse baffle provided by the new breakwater destroys the trajectory of the water *** the interior of the wave-breaking chamber,the water that enters from the gap of the permeable plate mixes with the water entering through the bottom *** turbulence created by this process further dissipates the wave *** relative submergence depth of h/d has a great influence on the hydrodynamic *** the relative depth is large,most of the wave energy enters the breakwater,the wave energy dissipation of the breakwater is large,and the wave-absorbing effect is *** research results provide important referential data for the study of permeable plate breakwaters.

关键词： Wave-structure interaction Plate breakwater Numerical simulation Wave force Regular wave Hydrodynamic