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Enhancing biological conversion of NO to N2O by utilizing thermophiles instead of mesophiles

Chemosphere 2024年 350卷

作者： Li, Dan Sun, Zhuqiu Luo, Ga Lu, Lichao Zhang, Shaobo Xi, Jinying Environmental Simulation and Pollution Control State Key Joint Laboratory School of Environment Tsinghua University Beijing100084 China School of Environmental Science and Engineering Yancheng Institute of Technology Yancheng 224051 China School of Petrochemical Engineering and Environment Zhejiang Ocean University Zhoushan316004 China Beijing Capital Sludge Disposal Technology Co. LTD Beijing100044 China

The production of nitrous oxide (N2O) through the biological denitrification of nitric oxide (NO) from flue gases has recently been achieved. Although the temperature of flue gas after desulphurization is usually 45–70 °C, all previous studies conducted microbial denitrification of NO under mesophilic conditions (22–35 °C). This study investigated the biological conversion of NO to N2O in both mesophilic (35–45 °C) and thermophilic conditions (45–50 °C). The results showed that temperature has a great impact on N2O production, with a maximum conversion efficiency (from NO to N2O) of 82% achieved at 45 °C, which is obviously higher than the reported conversion efficiencies (24–71%) under mesophilic conditions. Additionally, high-throughput sequencing result showed that the genera Enterococcus, Clostridium, Romboutsia, and Streptococcus were closely related to NO denitrification and N2O production. Microbial communities at 40 and 45 °C had greater metabolizing capacities for polymeric carbon sources. This study suggests that thermophilic condition (45 °C) is more suitable for biological production of N2O from NO. © 2023 Elsevier Ltd

关键词： Nitric oxide

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Non-deterministic multi-level model for planning water-ecology nexus system under climate change

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Cell Reports Sustainability 2024年第3期1卷

作者： Ma, Yuan Li, Yongping Wang, Hao Zhang, Yufei Zhou, Yanxiao Huang, Guohe State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Institute for Energy Environment and Sustainable Communities University of Regina Regina S4S 7H9 SK Canada

Water scarcity and ecological degradation impede sustainable development in Central Asia, which urgently calls for synergistic planning of water-ecology (WE) nexus system. However, existing management models may have large uncertainties, restricting their effectiveness. Here, we develop a copula-based flexible fuzzy multi-level programming (CFMP) method, which tackles uncertainties, such as water demands, and balances trade-offs among competing managers in top-down decision-making processes. Next, we formulate a CFMP-WE model for Central Asia (2021–2050), considering objectives of economic development, food security, and ecological restoration, and design 243 planning scenarios. We found that ecological water allocation would account for 5.9%–12.2% to support sustainable development;however, policymakers need to reduce agricultural water allocation, forgoing 7.8%–20.1% of the system benefit (i.e., economic benefit for WE nexus system). Agricultural water use would still be the largest (with 25.6%–29.4% for cereal crops to ensure food security), but its share would decline to conserve water for users like industry. © 2024 The Authors

关键词： Central Asia climate change copula-based programming multi-level programming multi-uncertainty sustainability water-ecology

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Real-world fuel consumption of light-duty passenger vehicles using on-board diagnostic (OBD) systems

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Frontiers of environmental Science & Engineering 2020年第2期14卷 207-216页

作者： Xuan Zheng Sheng Lu Liuhanzi Yang Min Yan Guangyi Xu Xiaomeng Wu Lixin Fu Ye Wu College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing 100084China International Council on Clean Transportation Beijing 100084China Shenzhen Research Academy of Environmental Sciences Shenzhen 518001China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China

An increasing discrepancy between real-world and type-approval fuel consumption for light-duty passenger vehicles(LDPVs)has been reported by several ***,real-world fuel consumption is measured primarily by a portable emission measurement *** on-board diagnostic(OBD)approach,which is flexible and offers high-resolution data collection,is a promising fuel consumption monitoring *** LDPVs were tested with a laboratory dynamometer based on a type-approval cycle,the New European Driving Cycle(NEDC).Fuel consumption was measured by the OBD and constant-volume sampling system(CVS,a regulatory method)to verify the accuracy of the OBD *** results of the OBD method and the regulatory carbon balance method exhibited a strong linear correlation(e.g.,R^2=0.906-0.977).Compared with the carbon balance results,the fuel consumption results using the OBD were 7.1%±4.3%lower on ***,the real-world fuel consumption of six LDPVs was tested in Beijing using the *** results showed that the normalized NEDC real-world fliel consumption of the tested vehicles was 13%±17%higher than the type-approval-based fuel *** the OBD values are lower than the actual fuel consumption,using a carbon balance method may result in a larger discrepancy between real-word and type-approval ftiel *** means of the operating mode binning and micro trip methods,a strong relationship(R^2=0.984)was established between the average speed and relative fuel *** congested roads(average vehicle speed less than 25 km/h),the fuel consumption of LDPVs is highly sensitive to changes in average speed.

关键词： Fuel consumption Light-duty passenger vehicles On-board diagnostic systems

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Volatile organic compounds in wintertime North China Plain:Insights from measurements of proton transfer reaction time-of-flight mass spectrometer(PTR-ToF-MS)

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Journal of environmental Sciences 2022年第4期34卷 98-114页

作者： Xianjun He Bin Yuan Caihong Wu Sihang Wang Chaomin Wang Yibo Huangfu Jipeng Qi Nan Ma Wanyun Xu Ming Wang Wentai Chen Hang Su Yafang Cheng Min Shao Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511443China Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou 511443China State Key Laboratory of Severe Weather&Key Laboratory for Atmospheric Chemistry of China Meteorology Administration Chinese Academy of Meteorological SciencesBeijing 100081China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China Nanjing Intelligent Environmental Science and Technology Co. Ltd.Nanjing 211800China Max Planck Institute for Chemistry Mainz 55128Germany

The characteristics of wintertime volatile organic compounds(VOCs)in the North China Plain(NCP)region are complicated and remain *** measurements were conducted by a proton transfer reaction time-of-flight mass spectrometer(PTR-ToF-MS)at a rural site in the NCP from November to December *** ions measured by PTRToF-MS were quantified and the overall VOC compositions were investigated by combining the measurements of PTR-ToF-MS and gas chromatography-mass spectrometer/flame ionization detector(GC-MS/FID).The measurement showed that although atmospheric VOCs concentrations are often dominated by primary emissions,the secondary formation of oxygenated VOCs(OVOCs)is non-negligible in the wintertime,i.e.,OVOCs accounts for 42%±7%in the total VOCs(151.3±75.6 ppbV).We demonstrated that PTR-MS measurements for isoprene are substantially overestimated due to the interferences of *** chemical changes of organic carbon in a pollution accumulation period were investigated,which suggests an essential role of fragmentation reactions for large,chemically reduced compounds during the heavy-polluted stage in wintertime *** changes of emission ratios of VOCs between winter 2011 and winter 2018 in the NCP support the positive effect of“coal to gas”strategies in curbing air *** high abundances of some key species(*** aromatics)indicate the strong emissions of coal combustion in wintertime of *** ratio of naphthalene to C8 aromatics was proposed as a potential indicator of the influence of coal combustion on VOCs.

关键词： North China Plain Volatile organic compound Wintertime PTR-ToF-MS

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Improvement of Low-Temperature Nh3-Scr Activity Over Cevo4 Modified by Sm

SSRN

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SSRN 2024年

作者： Li, Yingjie Du, Jinpeng Lin, Chunxi Lin, Jinhan Liu, Jianqi Cai, Jieying Liu, Congwei Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Ningbo315800 China University of Chinese Academy of Sciences Beijing100049 China College of Engineering Eastern Institute for Advanced Study Ningbo315201 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

In this study, CeSmVO4 catalysts were prepared using the coprecipitation method. The Ce0.8Sm0.2V catalyst exhibited excellent NH3-SCR activity in a wide temperature window range of 175 oC to 375 oC, even under a high GHSV of 200,000 h-1. Analysis using XRD, Raman, and BET techniques revealed that doping Sm into CeVO4 enlarged the surface area and reduced the crystallite size of the catalyst. The H2-TPR and XPS results indicated that the incorporation of Sm improved the redox ability and enhanced the interaction among Ce, Sm, and V. NH3-TPD results demonstrated that the introduction of Sm into CeVO4 resulted in an increase in the number of acid sites. All these factors contributed significantly to the enhancement of low-temperature NH3-SCR reaction activity. Moreover, the addition of Sm could increase the number of Lewis acid sites, enhance the adsorption of NOx species, and promote the formation of -NH2 species and NH4NO3 species, which play a vital role in enhancing the SCR activity. The NH3-SCR reaction on the Ce0.8Sm0.2V catalyst followed both Langmuir-Hinshelwood and Eley-Rideal mechanisms. © 2024, The Authors. All rights reserved.

关键词： Temperature

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中国钢铁行业减污降碳协同综合分析（英文）

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Engineering 2024年第9期 111-121页

作者：谭全银刘菲李金惠 State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University

Decarbonization and decontamination of the iron and steel industry（ISI）, which contributes up to 15% to anthropogenic CO2emissions（or carbon emissions） and significant proportions of air and water pollutant emissions in China, are challenged by the huge demand for steel. Carbon and pollutants often share common emission sources, indicating that emission reduction could be achieved synergistically. Here, we explored the inherent potential of measures to adjust feedstock composition and technological structure and to control the size of the ISI to achieve carbon emission reduction（CER） and pollution emission reduction（PER）. We investigated five typical pollutants in this study, namely, petroleum hydrocarbon pollutants and chemical oxygen demand in wastewater, particulate matter, SO2, and NOxin off gases,and examined synergies between CER and PER by employing cross elasticity for the period between 2022 and 2035. The results suggest that a reduction of 8.7%–11.7% in carbon emissions and 20%–31%in pollution emissions（except for particulate matter emissions） could be achieved by 2025 under a high steel scrap ratio（SSR） scenario. Here, the SSR and electric arc furnace（EAF） ratio serve critical roles in enhancing synergies between CER and PER（which vary with the type of pollutant）. However, subject to a limited volume of steel scrap, a focused increase in the EAF ratio with neglection of the available supply of steel scrap to EAF facilities would lead to an increase carbon and pollution emissions. Although CER can be achieved through SSR and EAF ratio optimization, only when the crude steel production growth rate remains below 2.2% can these optimization measures maintain the emissions in 2030 at a similar level to that in 2021. Therefore, the synergistic effects between PER and CER should be considered when formulating a development route for the ISI in the future.

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Regulating the Anchoring Structure to Enhance Thermostability of Ru Sub-Nano Clusters on Al-Based Supports for Efficient C–O Bonds Hydrogenolysis

SSRN

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SSRN 2025年

作者： Xiao, Hongfei Zhang, Jianghao Ge, Shuchao Du, Chuo Jin, Yifan Xie, Yuanyuan Gai, Chao Fang, Jinhou Zhang, Changbin State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China Weifang Research Institute of Materials and Technology for Eco-environmental Protection Shandong Weifang261300 China

Heterogeneous catalyst with highly dispersed active metal species has found wide applications in the catalytic conversion of lignocellulosic biomass, owing to the inherent advantages in metal atom efficiency. However, it is still confronted with the challenge for developing efficient strategies to achieve enhanced thermostability of the highly dispersed metal under harsh conditions. In this work, Ru species are supported on two different aluminum-based materials (i.e., γ-AlOOH and γ-Al2O3) that provide distinct anchoring sites for Ru. Complementary characterizations combined with theoretical calculations demonstrate that, compared with triply bridging Al-O site of γ-Al2O3, the doubly bridging Al-O site of AlOOH exhibits more intense electronic interaction with Ru species. Consequently, this doubly bridging Al-O site as the anchoring site provides sufficient thermal resistance to immobilize the sub-nanometer Ru species under the high-temperature aging condition. The maintained high dispersion of Ru on AlOOH creates an electron-deficient Ru domain and sustains the high activity and selectivity in the production of aromatics during the hydrotreating of diphenyl ether. This work may contribute to the catalyst design for manipulating the surface-anchoring structure to regulate thermostability and dispersion of supported metal catalysts. © 2025, The Authors. All rights reserved.

关键词： Hydrolysis

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Secondary aerosol formation in winter haze over the BeijingTianjin-Hebei Region,China

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Frontiers of environmental Science & Engineering 2021年第2期15卷 1-13页

作者： Dongjie Shang Jianfei Peng Song Guo Zhijun Wu Min Hu State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Department of Atmospheric Sciences Texas A&M UniversityCollege StationTX 77843USA Beijing Innovation Center for Engineering Sciences and Advanced Technology Peking UniversityBeijing 100871China

Severe haze pollution occurs frequently in the winter over the Beijing-Tianjin-Hebei(BTH)region(China),exerting profound impacts on air quality,visibility,and human *** Chinese Government has taken strict mitigation actions since 2013 and has achieved a significant reduction in the annual mean PM2.5 concentration over this ***,the level of secondary aerosols during heavy haze episodes showed little decrease during this *** heavy haze episodes,the concentrations of secondary aerosol components,including sulfate,nitrate and secondary organics,in aerosol particles increase sharply,acting as the main contributors to aerosol *** achieve effective control of particle pollution in the BTH region,the precise and complete secondary aerosol formation mechanisms have been investigated,and advances have been made about the mechanisms of gas phase reaction,nucleation and heterogeneous reactions in forming secondary *** paper reviews the research progress in aerosol chemistry during haze pollution episodes in the BTH region,lays out the challenges in haze formation studies,and provides implications and directions for future research.

关键词： Secondary aerosol formation Regional haze Photochemical reaction Aqueous reaction Chemical mechanism

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Nitrate removal from aqueous solutions by magnetic cationic hydrogel:Effect of electrostatic adsorption and mechanism

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Journal of environmental Sciences 2020年第5期32卷 177-188页

作者： Junyi Li Shuoxun Dong Yili Wang Xiaomin Dou Haotian Hao College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry UniversityBeijing 100083China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China

Excessive nitrate(NO3-)is among the most problematic surface water and groundwater *** this study,a type of magnetic cationic hydrogel(MCH)is employed for NO3-adsorption and well characterized *** adsorption capacity is considerably pHdependent and achieves the optimal adsorption(maximum NO3--adsorption capacity is95.88±1.24 mg/g)when the pH level is *** fitting result using the homogeneous surface diffusion model indicates that the surface/film diffusion controls the adsorption rate,and NO3-approaches the center of MCH particles within 30 *** diffusion coefficient(Ds)and external mass transfer coefficient(kF)in the liquid phase are1.15×10-6 cm2/min and 4.5×10-6 cm/min,*** MCH is employed to treat surface water that contains 10 mg/L of NO3-,and it is found that the optimal magnetic separation time is 1.6 *** high-efficiency mass transfer and magnetic separation of MCH during the adsorption-regeneration process favors its application in surface water ***,the study of the mechanism involved reveals that both-N+(CH3)3 groups and NO3-are convoluted in adsorption via electrostatic *** is further found that ion exchange between NO3-and chlorine occurs.

关键词： Adsorption Nitrate removal Low concentration Electrical stern layer Magnetic cationic hydrogel

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Enhanced activation of peroxydisulfate by strontium modified BiFeO3 perovskite for ciprofloxacin degradation

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Journal of environmental Sciences 2021年第1期33卷 249-259页

作者： Caicai Wang Shengwang Gao Jianchao Zhu Xunfeng Xia Mingxin Wang Yanna Xiong State Key Laboratory of Enuironmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental SciencesBeijing 100012China School of Environmental and Safety Engineering Changzhou UniversityChangzhou 213164China Solid Waste and Chemicals Management Center Ministry of Ecology and EnvironmentBeijing 100029China

A series of Sr-doped BiFeO3 perovskites(Bi1-xSrxFeO3,BSFO)fabricated via sol-gel method was applied as peroxydisulfate(PDS)activator for ciprofloxacin(CIP)*** technologies were used to characterize the morphology and physicochemical features of prepared BSFO samples and the results indicated that Sr was successfully inserted into the perovskites *** catalytic performance of BiFeO3 was significantly boosted by strontium ***,Bi0.9Sr0.1FeO3(0.1 BSFO)exhibited the highest catalytic performance for PDS activation to remove CIP,where 95%of CIP(10 mg/L)could be degraded with the addition of 1 g/L 0.1 BSFO and 1 mmol/L PDS within 60 ***,0.1 BSFO displayed high reusability and stability with lower metal *** acidic condition was preferred to neutral and alkaline conditions in 0.1 BSFO/PDS *** boosted catalytic performance can be interpreted as the lower oxidation state of Fe and the existence of affluent oxygen vacancies generated by Sr doping,that induced the formation of singlet oxygen(^1O_(2))which was confirmed as the dominant reactive species by radical scavenging studies and electron spin resonance(ESR)*** catalytic oxidation mechanism related to major ^1O_(2) and minor free radicals was *** study opens a new avenue to develop effective A-site modified perovskite and expands their application for PDS activation in wastewater remediation.

关键词： Perovskite Peroxydisulfate Heterogeneous catalysis Singlet oxygen Ciprofloxacin

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