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Nitrogen Removal Characteristics of a Novel Bacterium Klebsiella Sp. Tsh15 by Assimilatory/Dissimilatory Nitrate Reduction and Ammonia Assimilation

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SSRN 2023年

作者： Ren, Jilong Liu, Yanchen Huang, Xia State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

A novel HNAD strain with excellent nitrogen metabolic ability was screened and identified as Klebsiella sp. TSH15 by 16S rRNA. The results demonstrated that the ammonia-N and nitrate-N removal rates were 2.99 mg/L/h and 2.53 mg/L/h under optimal conditions, respectively. The analysis of the whole genome indicated that strain TSH15 contained the key genes involved in assimilatory/dissimilatory nitrate reduction and ammonia assimilation, including nas, nar, nir, nor, glnA, gltB, gdhA, and amt. The relative expression levels of key nitrogen removal genes were further detected by RT-qPCR. The results indicated that the N metabolic pathways of strain TSH15 were the conversion of nitrate or nitrite to ammonia by assimilatory/dissimilatory nitrate reduction (NO3−→NO2−→NH4+) and further conversion of ammonia to glutamate (NH4+-N → Glutamate) by ammonia assimilation. These results indicated that the strain TSH15 had the potential to be applied to practical sewage treatment in the future. © 2023, The Authors. All rights reserved.

关键词： Nitrogen removal

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Potential Stimulation of Nitrifying Bacteria by Landfill Leachate

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SSRN 2023年

作者： Li, Siqi Yang, Shaolin Xue, Yu Sahidul, M.D. Islam Liu, Yanchen Huang, Xia State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

With the increasing complexity of influent composition in wastewater treatment plants, the potential stimulating effects of refractory organic matter in wastewater on growth characteristics and species shift of nitrifying bacteria need to be further investigated. In this study, municipal wastewater was co-treated with landfill leachate in the lab-scale reactor, and the competition and co-existence of Ca. Nitrotoga and Nitrospira were observed. The results demonstrated that the addition of landfill leachate can significantly promote the growth of Ca. Nitrotoga, whereas Ca. Nitrotoga populations remain less competitive in domestic wastewater operation. In addition, we found that the refractory organic matter in the landfill leachate had a potential stimulating effect on the maximum specific growth rate of Nitrosomonas (μmax, aob). The μmax, aob of Nitrosomonas in the control group was estimated to be 0.49 d-1 by fitting the ASM model, and the μmax, aob reached 0.66-0.71 d-1 after injection of refractory organic matter in the landfill leachate, while the maximum specific growth rate of NOB (μmax, nob) was always in the range of 1.05-1.13 d-1. These findings have positive significance for the understanding of potential stimuli in nitrification processes and the stable operation of innovative wastewater treatment process. © 2023, The Authors. All rights reserved.

关键词： Biogeochemistry

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Influence of NO_(x) on the activity of Pd/θ-Al_(2)O_(3) catalyst for methane oxidation: Alleviation of transient deactivation

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Journal of environmental Sciences 2022年第2期34卷 38-47页

作者： Chang Cui Yan Zhang Wenpo Shan Yunbo Yu Hong He State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Ningbo Research Center for Urban Environment Chinese Academy of SciencesNingbo 315800China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China

Alumina supported Pd catalyst(Pd/Al_(2)O_(3)) is active for complete oxidation of methane, while often suffers transient deactivation during the cold down process. Herein, heating and cooling cycle tests between 200 and 900 ℃ and isothermal experiments at 650 ℃ were conducted to investigate the influence of NO_(x) on transient deactivation of Pd/θ-Al_(2)O_(3) catalyst during the methane oxidation. It was found that the co-fed of NO alleviated transient deactivation in the cooling ramp from 800 to 500 ℃, which was resulted from the in situ formation of NO_(2) during the process of methane oxidation. Over the Pd/θ-Al_(2)O_(3), thermogravimetric analysis and O_(2) temperature programmed oxidation measurements confirmed that transient deactivation was due to the decomposition of Pd O particles and the hysteresis of Pd reoxidation, while the metal Pd entities were less active for methane oxidation than the Pd O ones. CO pulse chemisorption and scanning transmission electron microscopy characterizations rule out the NO_(2) effect on Pd size change. Powder X-ray diffraction and X-ray photoelectron spectroscopy characterizations were used to obtain palladium status of Pd/θ-Al_(2)O_(3) before and after reactions, indicating that in lean conditions at 650 ℃, the presence of NO_(2) increases the content of active Pd O on the catalyst surface, thus benefits methane oxidation. Homogeneous reaction between CH 4, O_(2), and NO_(x) may be partially responsible for the alleviation above 650 ℃. The interesting research of alleviation in transient deactivation by NO_(x), the components co-existing in exhausts, are of great significance for the application.

关键词： Methane Catalytic oxidation Palladium NO_(x)influence

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Examining the Construction of China's Zero Waste Cities

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SSRN 2023年

作者： Li, Yushuang Li, Jinhui State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

In the nationwide effort to address environmental issues caused by solid waste, more than 100 cities in China have been included in the list of national Zero Waste City (ZWC) construction projects. However, the absence of a standardized evaluation method hinders quantitative comparisons among these cities. To overcome this challenge, a comprehensive five-dimension evaluation method was developed, taking into account both the national indicators and city-specific construction indicator systems. After the construction indicator system was transformed to an evaluation one, data processing and weight assignment methods were applied to obtain evaluation results for each dimension using linear weighted synthesis. Subsequently, By combining the results from individual dimensions, an overall evaluation score was derived. Meanwhile, utilizing obstacle analysis models and weighted scores, critical areas requiring attention in ZWC construction could be identified. Empirical research was conducted on shenzhen following this evaluation framework. The results revealed several key findings: 1) The quantitative score of ZWC performance in shenzhen increased significantly from 58.9 to 108.3 after the implementation of the pilot project. 2) The dimensions of Management Measure, Support Capacity, and City Characteristic had achieved or approached full scores, indicating commendable progress. However, the Management Level dimension still had room for improvement. 3) While industrial waste management reached an excellent level and agricultural waste proved manageable, challenges persisted in domestic waste landfill and construction waste disposal. These aspects are considered weak points that may require longer-term efforts to address due to inherent objective conditions. © 2023, The Authors. All rights reserved.

关键词： Data handling

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Photodegradation of soluble microbial products(SMPs) from membrane bioreactor by GO-COOH/TiO2/Ag

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Journal of environmental Sciences 2020年第2期32卷 292-300页

作者： Shuyan Yu Xia Huang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

This study aimed to explore a new degradation method-photocatalysis technology to polish membrane bioreactor(MBR) effluent, using 2,6-di-tert-butylphenol(2,6-DTBP) as a model soluble microbial product(SMP).2,6-DTBP is one of the predominant SMPs in MBR effluent, which is refractory and difficult to *** study developed a novel carboxylated graphene oxide/titanium dioxide/silver(GO-COOH/TiO2/Ag) nanocomposite to photodegrade 2,***-COOH/TiO2/Ag was successfully synthesized, using L-cysteine as the linker bonding TiO2/Ag to *** structural, morphological and optical properties of the GO-COOH/TiO2/Ag nanocomposite were characterized using various *** to synergistic effects, the GO-COOH/TiO2/Ag nanocomposite exhibited enhanced photocatalytic degradation performance under solar light irradiation when compared to TiO2, Ag and *** remove 25 mg/L 2,6-DTBP, the reaction time for GOCOOH/TiO2/Ag was only 30 min, faster than the 90 min required for pure TiO2 or *** addition, the 200 mg/L GO-COOH/TiO2/Ag nanocomposite aqueous solution showed the best performance under solar light, with 99% removal of 2,*** enhanced capability is likely due to the surface plasmon resonance(SPR) effect contributed by Ag nanoparticles(NPs) doped onto the *** addition, GO-COOH had a high effective surface area, which assisted in degrading the 2,6-DTBP through improved *** stability study showed that the photocatalytic activity of the GO-COOH/TiO2/Ag was stable enough for recycling multiple *** effective degradation performance and excellent stability demonstrates that the GO-COOH/TiO2/Ag nanocomposite can be a promising photocatalyst in the field of effluent SMP photodegradation, which solves the problem of the difficult biodegradation of highly toxic 2,6-DTBP.

关键词： Soluble microbial products (SMPs) 2,6-Di-tert-butylphenol (2,6-DTBP) Carboxylated graphene oxide/titanium dioxide/silver (GO-COOH/TiO2/Ag) nanocomposite Photocatalysis technology

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Micro-nanobubble–assisted As(III) removal from water by Ni-doped MOF materials

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environmental Science and pollution Research 2024年第31期31卷 43913-43926页

作者： Ye, Jian Zuo, Yize Chen, Qiang Yang, Zhiming Liu, Shaobo Yang, Chunping Tan, Xiaofei Hunan University Changsha410082 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Shenzhen Research Institute of Hunan University Shenzhen518055 China School of Architecture and Art Central South University Changsha410083 China Academy of Environmental and Resource Sciences School of Environmental Science and Engineering Guangdong University of Petrochemical Technology Guangdong Maoming525000 China Hunan Chuke Taiyan New Materials Co. Ltd. Jishou416000 China

Micro-nanobubbles (MNBs) can form reactive oxygen species (ROS) with high oxidizing potential. In this study, nickel-doped metal–organic framework materials (MOFs) capable of activating molecular oxygen were synthesized using trivalent arsenic (As(III)) as a target pollutant and combined with peroxymonosulfate (PMS) to construct a MOF/MNB/PMS system. The results included the rapid oxidation of As(III), the successful absorption of oxidized As(V), and finally the efficient removal of As. The effects of pH, amount of PMS used, and preparation time of MNBs on the As removal performance of the MOF/MNB/PMS system were investigated experimentally. The changes in the properties of the materials before and after the reaction were analyzed by XPS, and it was found that the main active sites on the surface of the MOFs were the metal elements and the pyridine nitrogen near the carbon atom. The regular morphology and elemental composition of the MOFs were determined by TEM scanning and EDS test, which indicated the presence of nickel. XRD tests before and after the reaction showed that the MOFs were structurally stable. The results of the free radical burst experiments show that the single linear oxygen (1O2) is the main active substance in the system, and that the MNBs are key factors by which the system achieves efficient oxidation performance. In addition to providing a sustainable supply of molecular oxygen to the MOFs during the reaction process, coupling the MNBs with PMS was found to improve the oxidation capacity of the system. The results of this study thus provide a new concept for As removal and advanced oxidation in water bodies. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Molecular oxygen

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Surface Uptake of Exogenous Volatile Organic Compounds Enhances the NO2-to-HONO Conversion on Soot

ACS ES&T Air

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ACS ES&T Air 2025年第6期2卷 1107-1114页

作者： Xinyuan Zhao Qiang Wang Peng Zhang Yonghong Wang Shuying Li Zhanyu Su Jun Liu Biwu Chu Qingxin Ma Yujing Mu Hong He College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China；State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China；Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China；State Key Laboratory of Advanced Environmental Technology Institute of Urban Environment Xiamen 361021 China

Heterogeneous reduction of nitrogen dioxides (NO2) on soot has been suggested to be a source of nitrous oxide (HONO) in the atmosphere. However, conventional wisdom says that the contribution of NO2reduction on soot to HONO formation is limited due to the rapid deactivation of surface reductive sites in the atmosphere. On the contrary, we show that adsorbed anthropogenic and biogenic volatile organic compounds (VOCs), collectively called exogenous VOCs (EVOCs), can persistently promote the heterogeneous conversion of NO2to HONO on soot. The surface uptake of NO2driven by H2O, coupled with the hydrogen reduction of NO2supported by EVOCs on elemental carbon (EC), is proposed to be the key pathway causing the persistent production of HONO. Furthermore, field observation conducted during biomass burning seasons in the North China Plain also showed that the presence of EVOCs promotes HONO production significantly. Our results imply that the continuous adsorption and conversion of EVOCs on soot surfaces may have a remarkable enhancing impact on the persistent conversion of NO2to HONO in the atmosphere.

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An Interval Fractional Electric Power System Planning Model for CO2 Emission Intensity Reduction: A Case Study of Fujian, China 14th

An Interval Fractional Electric Power System Planning Model ...

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14th International Conference on environmental Science and Technology, ICEST 2023

作者： Zhao, S.H. Li, J.W. Liu, J. Li, Y.P. Fujian Engineering and Research Center of Rural Sewage Treatment and Water Safety School of Environmental Science and Engineering Xiamen University of Technology Xiamen361024 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China

ISBN: (纸本)9783031546839

Using low-carbon/zero-carbon energy sources and negative emission technologies, and economic policies have proven to be effective measures for electric power plants’ CO2 emission mitigation. This study constructs an interval fractional electric power system planning (IFES) model for minimizing CO2 emission intensity considering the interactions between the measures and other constraints under uncertainty. The model is applied to Fujian Province as a real-case study, which contains electricity mix improvement, three types of CO2 emission reduction technologies, one policy. It was found that: (i) System carbon emission intensity is [170, 213] g/RMB;(ii) The proportion of clean energy power generation in Fujian Province will reach [92.32, 93.13]% in the 2055–2060, with nuclear energy, wind power and photovoltaic power generation ranking the top three;(iii) The electricity mix improvement has made the greatest contribution to the carbon neutrality of the power system (74.62%), and the contributions of CCS, DAC, and ESC are (9.11, 5.25, 11.02%) respectively. The research results provide scientific planning solutions for carbon reduction in the power industry in Fujian Province. The developed IF-ESP model can also be used in other regions around the world. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Electric power system planning

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Modelling the thresholds of nitrogen/phosphorus concentration and hydraulic retention time for bloom control in reclaimed water landscape

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Frontiers of environmental Science & Engineering 2022年第10期16卷 53-63页

作者： keying Song Shufeng Zhu Yun Lu Guohua Dao Yinhu Wu Zhuo Chen Shengnan Wang Junhan Liu Wenguang Zhou Hong-Ying Hu Environmental Simulation and Pollution Control State Key Joint Laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control(SMARC)School of EnvironmentTsinghua UniversityBeijing 100084China Beijing Laboratory for Environmental Frontier Technologies Beijing 100084China Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Educationand School of ResourcesEnvironmental&Chemical EngineeringNanchang UniversityNanchang 330031China Research Institute for Environmental Innovation(Suzhou)Tsinghua JiangsuSuzhou 215163China

The risks posed by algal blooms caused by nitrogen and phosphorus in reclaimed water used in urban water landscapes need to be carefully *** this study,the combined effects of the nitrogen and phosphorus concentrations and the light intensity and temperature on the specific growth rates of algae were determined using Monod,Steele,and Arrhenius models,then an integrated algal growth model was *** algae biomass,nitrogen concentration,and phosphorus concentration mass balance equations were used to establish a new control model describing the nitrogen and phosphorus concentration and hydraulic retention time thresholds for algal *** model parameters were determined by fitting the models to data acquired ***,the control model and numerical simulations for six typical algae and mixed algae under standard conditions were used to determine nitrogen/phosphorus concentration and hydraulic retention time thresholds for landscape water to which reclaimed water is supplied(i.e.,for a reclaimed water landscape).

关键词： Reclaimed water landscape Algal bloom Nitrogen and phosphorus Hydraulic retention time Threshold control model

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Impact of anthropogenic heat emissions on meteorological parameters and air quality in Beijing using a high-resolution model simulation

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Frontiers of environmental Science & Engineering 2022年第4期16卷 47-57页

作者： Hengrui Tao Jia Xing Gaofeng Pan Jonathan Pleim Limei Ran Shuxiao Wang Xing Chang Guojing Li Fei Chen Junhua Li Aviation University of Air Force Changchun 130022China School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua UniversityBeijing 100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China Research Triangle Park Environmental Protection AgencyNC 27711USA East Remote Sensing Laboratory United States Department of AgricultureNC 20250USA Unit No.96941 of Chinese People's Liberation Army Beijing 100041China Unit No.31010 of Chinese People's Liberation Army Beijing 100081China

Anthropogenic heat emissions(AHE)play an important role in modulating the atmospheric thermodynamic and kinetic properties within the urban planetary boundary layer,particularly in densely populated megacities like *** this study,we estimate the AHE by using a Large-scale Urban Consumption of energY(LUCY)model and further couple LUCY with a high-resolution regional chemical transport model to evaluate the impact of AHE on atmospheric environment in *** areas with high AHE,the 2-m temperature(T_(2))increased to varying degrees and showed distinct diurnal and seasonal variations with maxima in night and *** increase in 10-m wind speed(WS_(10))and planetary boundary layer height(PBLH)exhibited slight diurnal variations but showed significant seasonal ***,the systematic continuous precipitation increased by 2.1 mm due to the increase in PBLH and water vapor in upper *** contrast,the precipitation in local thermal convective showers increased little because of the limited water ***,the PM_(2.5) reduced in areas with high AHE because of the increase in WS_(10) and PBLH and continued to reduce as the pollution levels *** contrast,in areas where prevailing wind direction was opposite to that of thermal circulation caused by AHE,the WS_(10) reduced,leading to increased PM_(2.5).The changes of PM_(2.5) illustrated that a reasonable AHE scheme might be an effective means to improve the performance of PM_(2.5) ***,high AHE aggravated the O_(3) pollution in urban areas due to the reduction in NO_(x).

关键词： Anthropogenic heat emissions LUCY High-resolution Meteorological parameters Air quality

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