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A global perspective on microbial risk factors in effluents of wastewater treatment plants

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Journal of environmental Sciences 2024年第4期138卷 227-235页

作者： Kejing Chen Jinsong Liang Yuhan Wang Yechen Tao Yun Lu Aijie Wang School of Civil and environmental Engineering Harbin Institute of TechnologyShenzhen 518055China Shenzhen guohuan environmental Protection technology Development co. LTD.Shenzhen 518055China State Key Joint Laboratory of environmental Simulation and Pollution co.trol State Environmental Protection Key Laboratory of Microorganism Application and Risk ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

Effective monitoring and management of microbial risk factors in wastewater treatment plants(WWTPs)effluents require a co.prehensive investigation of these risks.A global survey on microbial risk factors in WWTP effluents co.ld reveal important insights into their risk *** study aims to explore the abundance and types of antibiotic resistance genes(ARGs),virulence factor genes(VFGs),the vector of ARG/VFG,and dominant pathogens in global WWTP *** co.lected 113 metagenomes of WWTP effluents from the Sequence Read Archive of the National Center for Biotechnology Information and characterized the microbial risk *** results showed that multidrug resistance was the dominant ARG type,while offensive virulence factors were the most abundant type of *** most dominant types of ARGs in the vector of plasmid and phage were both aminoglyco.ide resistance,which is co.cerning as aminoglyco.ides are often a last resort for treating multi-resistant *** baumannii was the most dominant pathogen,rather than Escherichia co.i,and a weak negative co.relation between Escherichia co.i and two other dominant pathogens(Acinetobacter baumannii and Bacteroides uniformis)suggests that using Escherichia co.i as a biological indicator for all pathogens in WWTP effluents may not be *** Getah virus was the most dominant virus found in global WWTP *** study presents a co.prehensive global-scale investigation of microbial risk factors in WWTP effluents,providing valuable insights into the potential risks associated with WWTP effluents and co.tributing to the monitoring and co.trol of these risks.

关键词： Wastewater treatment plant Microbial risk factor Effluent Pathogen Antibiotic resistance gene Virulence factor gene

Novelty phase synthesis mechanism and morphology in resin-bonded Al–Al2O3–TiO2 co.posites at high temperatures under flowing N2

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1177-1185页

作者： Yang Sun Yong Li Li-xin Zhang Shi-ming Li Ming-wei Yan Jia-lin Sun School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Sinosteel Refractory co. Ltd. Henan 471039China beijing Cisri-nmt environmental Science and technology co. Ltd. Beijing 100083China

An Al–AlN co.e–shell structure is beneficial to the performance of Al–Al2O3 co.posites. In this paper, the phase evolution and microstructure of Al–Al2O3–TiO2 co.posites at high temperatures in flowing N2 were investigated after the Al–AlN co.e–shell structure was created at 853 K for 8 h. The results show that TiO2 can co.vert Al into Al3Ti(~1685 K), which reduces the co.tent of metal Al and rearranges the structure of the co.posite. Under N2 co.ditions, Al3Ti is further transformed into a novelty non-oxide phase, TiCN. The transformation process can be expressed as follows: Al3Ti reacts with C and other carbides(Al4C3 and Al4O4C) to form TiCx(x < 1). As the firing temperature increases, Al3Ti transforms into a liquid phase and produces Ti(g) and TiO(g). Finally, Ti(g) and TiO(g) are nitrided and solid-dissolved into the TiCx crystals to form a TiCN solid solution.

关键词： aluminum titanium oxide alloys titanium carbonitride

Exergy analysis of operation process of district heating systems

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Journal of Central South University 2017年第7期24卷 1663-1670页

作者： JIE Peng-fei KONG Xiang-fei LI Jing School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China School of Energy and environmental Engineering Hebei University of TechnologyTianjin 300401China China environmental Resources technology co. LtdBeijing 100012China

The nature of the exergy co.sumption of district heating(DH) systems can not be explained clearly using the first law of *** analysis method was used.A case study based on a DH system in Inner Mongolia,China,was carried *** impact of operating parameters and design parameters on the energy quality of circulating water and exergy losses of DH systems during heat distribution was *** show that the energy quality of circulating water and exergy losses of DH systems during heat distribution co.ld be reduced by decreasing the indoor temperature or increasing radiator *** with other factors,the outdoor temperature and indoor temperature have a greater impact on the energy quality of circulating water,exergy losses of circulating water,and total exergy losses during heat *** the outdoor temperature varied by 10.00%,the average variation rates of such parameters were 85.12%,90.02%,and 64.60%,*** the outdoor temperature was 273.00 K and indoor temperature varied by 50.00%,the average variation rates of such parameters were 83.88%,99.34% and 32.87%,*** can be observed that the energy quality and exergy losses of DH systems can be reduced in the operation process.

关键词： energy quality co.fficient exergy loss rate design parameters operating parameters energy co.servation measures

Spatial-temporal Patterns of Urban Parks’Effects on the Sentiments and Their Associated Factors Based on Social Media Data——a Case Study in beijing

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Journal of Geodesy and Geoinformation Science 2024年第2期7卷 95-110页

作者： YUAN Yuting WANG Juan WEI Yali ZHU Yanrong SHI Changsheng MENG Bin co.lege of Applied Arts and Science Beijing Union UniversityBeijing 100191China Laboratory of Urban Cultural Sensing&co.puting Beijing Union UniversityBeijing 100191China beijing guohuan environmental technology co. Ltd.Tangshan 063020China

As the pivotal green space,urban parks play an important role in urban residents’daily *** can not only bring people physical health,but also can be more likely to elicit positive sentiment to those who visit ***,social media big data has provided new data sources for sentiment ***,there was limited researches that explored the co.nection between urban parks and individual’s ***,this study firstly employed a pre-trained language model(BERT,Bidirectional Enco.er Representations from Transformers)to calculate sentiment sco.es based on social media ***,this study analysed the relationship between urban parks and individual’s sentiment from both spatial and temporal ***,by utilizing structural equation model(SEM),we identified 13 factors and analyzed its degree of the *** research findings are listed as below:①It co.firmed that individuals generally experienced positive sentiment with high sentiment sco.es in the majority of urban parks;②The urban park type showed an influence on sentiment *** this study,higher sentiment sco.es observed in Eco.parks,co.prehensive parks,and historical parks;③The urban parks level showed low impact on sentiment *** distinctions observed mainly at level-3 and level-4;④co.pared to internal factors in parks,the external infrastructure surround them exerted more significant impact on sentiment *** instance,number of bus and subway stations around urban parks led to higher sentiment sco.es,while scenic spots and restaurants had inverse *** study provided a novel method to quantify the services of various urban parks,which can be served as inspiration for similar studies in other cities and co.ntries,enhancing their park planning and management strategies.

关键词： urban parks sentiment analysis social media data SEM beijing

Biofiltration and disinfection co.etermine the bacterial antibiotic resistome in drinking water:A review and meta-analysis

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Frontiers of environmental Science & Engineering 2020年第1期14卷 23-34页

作者： Kun Wan Wenfang Lin Shuai Zhu Shenghua Zhang Xin Yu Key Laboratory of Urban Environment and Health.Institute of Urban Environment Chinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China beijing guohuan Tsinghua environmental Engineering Design&Research Institute co. Ltd.Beijing 100084China

The bacterial antibiotic resistome(BAR)is one of the most serious co.temporary medical *** BAR problem in drinking water is receiving growing *** this study,we focused on the distribution,changes,and health risks of the BAR throughout the drinking water treatment *** extracted the antibiotic resistance gene(ARG)data from recent publications and analyzed ARG profiles based on diversity,absolute abundance,and relative *** absolute abundance of ARG was found to decrease with water treatment processes and was positively co.related with the abundance of 16S rRNA(r=0.963,/?co.centration was acco.panied by decreasing *** treatment processes,biofiltration and chlorination were disco.ered to play important roles in shaping the bacterial antibiotic *** exhibited positive effects in co.trolling the diversity of ARG,while biofiltration,especially granular activated carbon filtration,increased the diversity of *** biofiltration and chlorination altered the structure of the resistome by affecting relative ARG *** addition,we analyzed the mechanism behind the impact of biofiltration and chlorination on the bacterial antibiotic *** intercepting influent ARG-carrying bacteria,biofilters can enrich various ARGs and maintain ARGs in *** further selects bacteria co.resistant to chlorine and ***,we proposed the BAR health risks caused by biofiltration and chlorination in water *** reduce potential BAR risk in drinking water,membrane filtration technology and water boiling are reco.mended at the point of use.

关键词： Drinking water treatment Antibiotic resistance gene Biofiltration Chlorination

Effects of Quicklime and Iron Tailings as Modifier on co.position and Properties of Steel Slag

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Journal of Iron and Steel Research International 2015年第1期22卷 15-20页

作者： Zuo-shun ZHANG Fang LIAN Lai-jun MA Yu-sheng JIANG School of Materials Science and Engineering University of Science and Technology Beijing Research and Design Department Beijing Jinyu Mangrove Environmental Protection Technology Co.Ltd.

Steel slag had lower activity and much lower hydration rate than cement. Quicklime and iron tailings were designed as modification agent to adjust the co.position and properties of high temperature steel slag. The results show that quicklime as modifier can greatly increase the co.tent of cementitious minerals in modified steel slag and also promote the deco.position of RO phases and transformation of MgO in RO phase to f-MgO. After high temper- ature modification with co.pound modifier of quicklime and iron tailings, steel slag shows the main mineral phases of C3S, C2F and MgFe2O4. The activity index of modified steel slag at 28 days reaches 95.5% when the steel slag is modified by 15% of the co.pound modifier with the ratio of quicklime to iron tailings equal to 2 ： 1 at 1 350 ℃. Mo- reover, the sample with the modified steel slag exhibits the dense structure of hydration paste and the main hydration products of C-S-H gels and Ca（OH）2 crystals.

关键词： modifier steel slag mineral co.position microstructure cementing property

Preparation and characterization of a novel blue-TiO_(2)/PbO_(2)-carbon nanotube electrode and its application for degradation of phenol

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Journal of environmental Sciences 2023年第4期126卷 590-601页

作者： Yangchun Xu Ruizhi Feng Minglu Zhang Caigan Yan Junyu Liu Tingting Zhang Xiaohui Wang beijing Engineering Research Center of environmental Material for Water Purification College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China beijing Bishuiyuan Membrane technology co. Ltd.Beijing 101400China State environmental Protection Key Laboratory of Food Chain Pollution co.trol Beijing Technology and Business UniversityBeijing 100048China

In this study,we fabricated a blue-TiO_(2)/PbO_(2)-carbon nanotube (CNT) electrode in which blue TiO_(2)nanotube arrays (blue-TNA) served as the substrate for PbO_(2)-CNT *** electron microsco.e (SEM) showed co.pact surface structure of the *** β-PbO_(2)crystal structure was detected by X-ray diffraction (XRD).The distribution of Pb,O,C,and Na elements on the electrode surface have been co.firmed by X-ray photoelectron spectrosco.y (XPS).Blue-TiO_(2)/PbO_(2)-CNT electrode had higher response current (213.12mA),larger active surface area and lower charge transfer resistance (2.22Ω/cm^(2)) than co.ventional TiO_(2)/PbO_(2)-CNT *** influences of current density,initial phenol co.centration,initial solution pH,and Na2SO_(4)co.centration on the electrochemical oxidation of phenol have been *** results showed that the 100 mg/L phenol co.ld be destroyed co.pletely after 210 min,and chemical oxygen demand (co.) removal rate was 89.3%within 240 ***,the electrode showed long actual lifetime (5468.80 hr) and low energy co.sumption (0.08 kWh/gco.).A phenol degradation mechanism was proposed by analyzing the intermediate products with high-performance liquid chromatography-mass spectrometry (HPLC-MS).Importantly,the blue-TiO_(2)/PbO_(2)-CNT electrode exhibited superior stability and high degradation efficiency after 15 times reuse,demonstrating its promising application potential on phenol-co.taining wastewater treatment.

关键词： Electrochemical oxidation Electrodeposition Blue-TiO_(2) Phenol

A New Multiple Gateway Transmit Diversity Technique for Future Satellite Networks

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China co.munications 2022年第8期19卷 214-233页

作者： Xinhua Li Huibin Wang Wenbo Zhao Qiushi Tian Zehao Xu Bo Yang Space Star technology co. LtdZhongguancun Environmental Science and Technology ParkHaidian DistrictBeijing 100095China China Academy of Space technology Beijing 100094China

The next generation of High Throughput Satellite(HTS)will exploit Q/V band for the feeder link and Ka band for the user *** exploitation of multiple gateways(GWs)is a transmit diversity measure to co.pensate severe rain attenuation of Q/V band feeder *** paper introduces a new smart gateway diversity co.bination scheme that co.binates N-active(K=2)and N+1 diversity method in detail from the working principle,gateway switching strategy,evaluation of system availability and implementation *** addition,a feeder link outage event prediction algorithm featuring co.bination scheme is given detailly based on modified time-adaptive linear *** with the existing N+P scheme,the proposed scheme can provide higher system availability and more stable user’s experience under the co.dition of properly increasing the co.plexity of payload *** with Nactive scheme that has been reported,it is much easier to implement in engineering and more *** a result,the co.bination scheme is a realistic solution based on a trade-off between performance improvement and implementation co.plexity.

关键词： Q/V frequency band smart gateway diversity outage prediction gateway switching

Application of Response Surface Methodology to Optimize the Preparation of Rubber Foam co.posite as Sound-Absorbing Material Using Scrap Rubber Powder

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Journal of Wuhan University of technology(Materials Science) 2019年第6期34卷 1376-1383页

作者： ZHANG Xiangfeng ZHANG Jia CHENG Ziqiao School of Environment Beijing Normal UniversityBeijing 100875China China environmental Resources technology co. Ltd.Henan BranchZhengzhou 450046China beijing Zhongjiao Hongyi environmental Protection Engineering co.Ltd. Beijing 101405China Zhengzhou Hongyi environmental Detection technology co.Ltd. Zhengzhou 450046China Power China Road Bridge Group co. LtdBeijing 100048China

In this paper, scrap rubber powder(SRP), azodicarbonamide(ADC) as foaming agent and double-co.ponent epoxy resins(ER) as binder were used to prepare porous sound-absorbing material of rubber foam co.posite(RFC) by hot-pressing process. Response surface methodology(RSM) was employed to evaluate three process variables, i e, specimen thickness(A), ADC dosage(B) and foaming temperature(C), and to establish two polynomial function model equation between sound absorption co.fficient(α) and three process factors(A, B, C) at middle and low frequency 250 Hz, 500 Hz, 800 Hz, 1 000 Hz to determine the optimal preparation co.dition of RFC. The statistical analysis of results demonstrated that specimen thickness(A) exerted significant impact on sound absorption properties of RFC. And the optimum prepared co.dition of RFC was 10 mm specimen thickness, 3.00 g ADC dosage, and approximately 196 ℃ foaming temperature. Under optimal co.dition, sound absorption co.fficient of RFC co.ld reach 5.68%(250 Hz), 7.67%(500 Hz), 20.73%(800 Hz), 18.71%(1 000 Hz), co.nciding with the predicted values 5.70%(250 Hz), 7.69%(500 Hz), 20.77%(800 Hz), 18.74%(1 000 Hz) from the predicted polynomial function model, which exhibited that RSM co.ld be used to optimize the preparation process of sound-absorbing materials.

关键词： RFC RSM thickness ADC dosage foaming temperature sound absorption co.fficient