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Nitrate in shallow groundwater in typical agricultural and forest ecosystems in China,2004-2010

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Journal of Environmental Sciences 2013年第5期25卷 1007-1014页

作者： Xinyu Zhang Zhiwei Xu Xiaomin Sun wenyi dong Deborah Ballantine Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences National Institute of Water and Atmospheric Research HamiltonNew Zealand

The nitrate-nitrogen（NO 3-N） concentrations from shallow groundwater wells situated in 29 of the Chinese Ecosystem Research Network field stations,representing typical agroand forest ecosystems,were assessed using monitoring data collected between 2004 and *** from this assessment permit a national scale assessment of nitrate concentrations in shallow groundwater,and allow linkages between nitrate concentrations in groundwater and broad land use categories to be *** indicated that most of the NO 3--N concentrations in groundwater from the agroand forest ecosystems were below the Class 3 drinking water standard stated in the Chinese National Standard：Quality Standard for Ground Water（≤ 20 mg/L）.Over the study period,the average NO 3--N concentrations were significantly higher in agro-ecosystems（4.1 ± 0.33 mg/L） than in forest ecosystems（0.5 ± 0.04 mg/L）.NO 3-N concentrations were relatively higher（〉 10 mg N /L） in 10 of the 43 wells sampled in the agricultural *** elevated concentrations occurred mainly in the Ansai,Yucheng,Linze,Fukang,Akesu,and Cele field sites,which were located in arid and semiarid areas where irrigation rates are *** suggest that improvements in N fertilizer application and irrigation management practices in the arid and semi-arid agricultural ecosystems of China are the key to managing groundwater nitrate concentrations.

关键词： Chinese Ecosystem Research Network shallow groundwater agricultural forest ecosystems nitrate concentration

Decomplexation of Cu-1-hydroxyethylidene-1,1-diphosphonic acid by a three-dimensional electrolysis system with activated biochar as particle electrodes

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Journal of Environmental Sciences 2023年第2期124卷 630-643页

作者： Xing Wang Zilong Zhao Hongjie Wang Feng Wang wenyi dong School of Civil and Environmental Engineering Harbin Institute of Technology ShenzhenShenzhen 518055China Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control Shenzhen 518055China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

The feasibility of decomplexation removal of typical contaminants in electroplating wastewater,complexed Cu(Ⅱ)with 1-hydroxyethylidene-1,1-diphosphonic acid(Cu-HEDP),was first performed by a three-dimensional electrode reactor with activated biochar as particle *** the case of 50 mg/L Cu-HEDP,Cu(Ⅱ)removal(90.7%)and PO_(4)^(3−)conversion(34.9%)were achieved under the conditions of electric current 40 mA,initial pH 7,acid-treated almond shell biochar(AASB)addition 20 g/L,and reaction time 180 min,with second-order rate constants of 1.10×10^(−3) and 1.94×10^(−5) min^(−1) *** growing chelating effect between Cu(II)and HEDP and the comprehensive actions of adsorptive accumulation,direct and indirect oxidation given by particle electrodes accounted for the enhanced removal of Cu-HEDP,even though the mineralization of HEDP was mainly dependent on anode *** performance attenuation of AASB particle electrodes was ascribed to the excessive consumption of oxygen-containing functionalities during the reaction,especially acidic carboxylic groups and quinones on particle electrodes,which decreased from 446.74 to 291.48μmol/g,and 377.55 to 247.71μmol/g,*** on the determination of adsorption behavior and indirect electrochemical oxidation mediated by in situ electrogenerated H_(2)O_(2) and reactive oxygen species(e.g.,•OH),a possible removal mechanism of Cu-HEDP by three-dimensional electrolysis was further proposed.

关键词： Cu-HEDP Electrochemical oxidation Particle electrode Reaction characteristics Removal mechanism

Optimizing Winding Angles of Reinforced Thermoplastic Pipes Based on Progressive Failure Criterion

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Journal of Ocean University of China 2021年第5期20卷 1067-1078页

作者： WANG Yangyang LOU Min ZENG Xin dong wenyi WANG Sen School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Key Laboratory of Unconventional Oil&Gas Development(China)University of Petroleum(East China) Ministry of EducationQingdao 266580China Zoomlion Heavy Industry Science&Technology Co. Ltd.Changsha 410013China China Offshore Oil Engineering(Qingdao)Co. Ltd.Qingdao 266520China Weihai Nacheon Pipeline Co. Ltd.Weihai 264400China

This paper examines a scheme to optimize the multiple winding angles of reinforced thermoplastic pipes(RTPs)under internal and external *** consider the nonlinear mechanical behavior of the material under changes of winding angle due to deformation,we use three-dimensional(3D)thick-walled cylinder theory with the 3D Hashin failure criterion and theory of the evolution of damage to composite materials,to formulate a model that analyzes the progressive failure of *** accuracy of the model was verified by experiments.A model to optimize the multiple winding angles of the RTPs was then established using the model for progressive failure analysis and a multi-island genetic *** optimal scheme for winding angles of RTPs capable of withstanding the maximum internal/external pressure was *** simulation results showed that the ply number of the reinforced layer has a prominent nonlinear effect on the internal and external pressure capacity of the *** with RTPs with a single angle of±55°,the multiple winding angle overlay scheme based on the multi-angle optimization model improved the internal and external pressure capacity of the RTPs,and the improvement in the external pressure capacity was significantly better than the internal pressure carrying capacity.

关键词： reinforced thermoplastic pipes 3D thick-walled cylinder theory multi-island genetic algorithm pressure capacity

PAC Addition for MBR Start up in Micro-polluted Water Treatment

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Journal of Harbin Institute of Technology(New Series) 2015年第3期22卷 40-47页

作者： Quan Zhang Feiyun Sun wenyi dong Rubing Han Lei Liu School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin Institute of Technology Shenzhen Graduate School Quality Testing Center

In order to improve membrane reactor( MBR) performance for micro-polluted surface water treatment in start-up phase,removals of nitrogen and organic matters especially synthetic organic matters by MBR and a simultaneous application of powdered activated carbon( PAC) with MBR( PAC-MBR) using flat sheet membrane are investigated. The results confirm that MBR treatment can be effective for the removal of organic matters including trace organics. The added PAC can improve contaminant removal efficiency especially in the beginning of operation when MBR cannot effectively remove contaminants and effluent satisfying quality standards is obtained. Moreover,the removal efficiency of target trace synthetic organics is investigated and the removal mechanism is discussed. Biodegradation by microorganism,rejection by filtration of membrane with biofilm and adsorption all contribute to the removal performance. Furthermore,volatile organic compounds can be removed by aeration. The filtration process is confirmed important for natural organic matters( NOM)removal in both MBR and PAC-MBR systems. Combining with PAC,the MBR can remove all fractions of NOM while the single MBR can hardly reduce fulvic or humic acid in water even during the steady operation.

关键词： MBR powdered activated carbon trichloroethylene nitrobenzene trichlorophenol

A novel multistage anoxic/aerobic process with sludge regeneration zone (R-MAO) for advanced nitrogen removal from domestic sewage

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Journal of Environmental Sciences 2023年第2期124卷 758-768页

作者： Lin Cao Rong Sun wenyi dong Hongjie Wang Zhongyi Dai Xue Wang Jin Xie Hua Li School of Chemical Engineering Huaqiao UniversityXiamen 361021China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of TechnologyHarbin 150090China School of Civil and Environmental Engineering Harbin Institute of Technology ShenzhenShenzhen 518055China Central and Southern China Municipal Engineering Design&Research Institute Co. Ltd.Wuhan 430010China Shenzhen Water Group Co. Ltd.Shenzhen 518000China

To achieve advanced nitrogen removal from actual municipal sewage,a novel multistage anoxic/aerobic process with sludge regeneration zone(R-MAO)was *** reactor was used to treat actual domestic sewage and the nitrogen removal capacity of the sludge regeneration zone(R zone)was investigated during the long-term *** best performance was obtained at the R zone’s Oxidation-Reduction Potential(ORP)of-50±30 mV and hydraulic residence times(HRT)of 1.2 *** average effluent COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N of the R-MAO process were 18.0±2.3,7.5±0.6,1.0±0.5 and 4.6±0.4 mg/L,respectively,with the corresponding removal efficiency of COD,TN and NH_(4)^(+)-N were 92.9%±1.0%,84.1%±1.5% and 97.5%±1.1%.Compared to the sole MAO system,the TN removal efficiency of the R-MAO increased by 10.1%.Besides,under the optimal conditions,the contribution of the R zone in the R-MAO that removal COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N were 0.36,0.15,0.032 and 0.82 g/***-throughput sequencing results showed that uncultured_bacterium_f_Burkholderiaceae(5.20%),OLB8(1.04%)and Ottowia(1.03%)played an important role in denitrification in the R *** study provided effective guidance for the design and operation of the R-MAO process in domestic sewage treatment.

关键词： Advanced nitrogen removal Multistage anoxic/aerobic process Sludge regeneration zone(R zone) Microbial community

Specific Responses of Soil Microbial Residue Carbon to Long-Term Mineral Fertilizer Applications to Reddish Paddy Soils

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Pedosphere 2018年第3期28卷 488-496页

作者： ZHANG Xinyu XIE Juan YANG Fengting dong wenyi DAI Xiaoqin YANG Yang SUN Xiaomin Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences Beijing 100101( China) College of Resources and Environment University of Chinese Academy of Sciences Beijing 100190( China) Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural Sciences Beijing 100081(China)

Mineral nutrient inputs to soil may alter microbial activity and consequently influence the accumulation of microbial residues. In this study, we investigated the effects of application rates and ratios of mineral fertilizers on the microbial residue carbon(MRC) of reddish paddy soils after long-term(15-year) fertilizer applications in southern China. Contents of three soil amino sugars as microbial residue contents were determined and MRC were calculated based on amino sugars. Results showed that three individual amino sugar contents increased as fertilizer application rates increased until maximum values were reached at a rate of 450-59-187 kg ha^(-1) year^(-1)(N-P-K). The three amino sugar contents then declined significantly under the highest mineral fertilizer application rate of 675-88-280 kg ha^(-1) year^(-1)(N-P-K). In addition, to enhance the microbial residue contents, it was more beneficial to double P(N:P:K= 1:0.26:0.41) in fertilizers applied to the P-deficient reddish paddy soils than to double either N(N:P:K = 2:0.13:0.41) or K(N:P:K= 1:0.13:0.82). The contents of the three individual amino sugars and microbial residues under different fertilizer application rates and ratios were significantly and positively correlated with soil organic carbon(SOC), total N, total P, and p H. Increases in values of the fungal C to bacterial C ratios showed that soil organic matter(SOM) stability increased because of the fertilizer applications over the past 15 years. The contents and ratios of amino sugars can be used as indicators to evaluate the impact of mineral fertilizer applications on SOM dynamics in subtropical paddy soils. The results indicated that fertilizer applications at a rate of 450-59-187 kg ha^(-1) year^(-1)(N-P-K) may improve crop yields, SOC contents, and SOC stability in subtropical paddy soils.

关键词： amino sugar application rate application ratio bacterial C fungal C soil nutrient soil organic C

A vortex induced vibration of marine riser in waves

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Acta Oceanologica Sinica 2011年第4期30卷 96-101页

作者： LOU Min dong wenyi GUO Haiyan College of Petroleum Engineering China University of Petroleum （East China） Dongying257061 China Offshore Oil Engineering （Qingdao） Company Limited Qingdao 266520 China College of Engineering Ocean University of China Qingdao 266071 China

A marine riser transporting fluid in the Bohai Sea was selected as study object,using an experi-mental and numerical method to study its vortex induced vibration in waves. A similarity theory was used in the experiment to derive the experimental model from a practical model,the dy-namic response of a riser model was measured in waves. A corresponding numerical simulation was performed using a finite element method. Comparisons were made with the results between the experiment and the numerical simulation. Some valuable results were obtained.

关键词： riser VIV wave experiment

Carbamazepine degradation by visible-light-driven photocatalyst Ag_(3)PO_(4)/GO:Mechanism and pathway

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Environmental Science and Ecotechnology 2022年第1期9卷 17-26页

作者： Guanhan Chen wenyi dong Hongjie Wang Zilong Zhao Feng Wang Feifei Wang Cesar Nieto-Delgado School of Civil and Environmental Engineering Harbin Institute of Technology ShenzhenShenzhen518055PR China Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control Shenzhen518055PR China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090PR China Division de Ciencias Ambientales Instituto Potosino de Investigacion Científica y TecnologicaIPICyT.Camino a la Presa San Jose 2055.San Luis PotosíSLP 78216Mexico

Carbamazepine(CBZ),as one of the most frequently detected pharmaceuticals,is of great concern due to its potential impact on the ecosystem and human *** study provides an effective approach to remove CBZ by using photocatalyst silver phosphate combined with graphene oxide(Ag_(3)PO_(4)/GO)under visible *** morphology,composition,and optical properties of Ag_(3)PO_(4)/GO were characterized employing SEM,XRD,and *** oxide could improve the visible-light utilization and promote electron's charge to enhance the photocatalytic performance of Ag_(3)PO_(4)/*** the optimal reaction condition of 5.86 mW/cm_(2)light intensity,15-25℃ temperature,5-7 pH,and 0.5 mg/L catalytic dosages,5 mg/L CBZ could be completely degraded in 30 min,and the apparent rate constant could reach 0.12 min^(-1).Additionally,the radical trapping experiments indicated·OH and O_(2)^(-)· were the main reactive oxygen species employed to eliminate *** decay pathways of CBZ had been proposed accordingly,and the main product was the low-molecular products.

关键词： Carbamazepine Ag_(3)PO_(4)/GO Visible light Photocatalysis

Systematic analysis of clinical relevance and molecular characterization of m^(6)A in COVID-19 patients

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Genes & Diseases 2022年第5期9卷 1170-1173页

作者： Sanqi An Zhouhua Xie Yanyan Liao Junjun Jiang wenyi dong Fuqiang Yin Wen-Xing Li Li Ye Jianyan Lin Hao Liang Biosafety Level-3 Laboratory Life Sciences Institute&Guangxi Key Laboratory of AIDS Prevention and Treatment&Guangxi Collaborative Innovation Center for BiomedicineGuangxi Medical UniversityNanningGuangxi 530021PR China Fourth People's Hospital of Nanning NanningGuangxi 530024PR China Department of Biochemistry and Molecular Biology School of Basic Medical SciencesSouthern Medical UniversityGuangzhouGuangdong 510515PR China

N6-methyladenosine(m6A)is the most prevalent post-transcriptional RNA modification in mRNA and long non-coding RNAs of eukaryotes,and its biological functions are mediated by m6A writers,erasers and readers.1 A nuclear methyltransferase complex consisting of METTL3,METTL14,WTAP,VIRMA,ZC3H13,RBM15(or RBM15B),YWHAG,TRA2A and CAPRIN1 catalyzes the m6A modifications,acting as m6A writers.1 m6A demethylase ALKBH5 as well as m6A demethylase FTO mediate the demethylation of m6As,acting as the m6A erasers.

关键词： m6A patients clinical