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Assessing quinoline removal performances of an aerobic continuous moving bed biofilm reactor(MBBR) bioaugmented with Pseudomonas citronellolis LV1

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Chinese Journal of Chemical Engineering 2023年第5期57卷 132-140页

作者： Hu Chen Ying wang puyu wang Yongkang Lv Innovation Institute of Environmental Industry College of Environmental Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China The State Key Laboratory of Clean and Efficient Utilization of Coal-Based Energy Taiyuan University of TechnologyTaiyuan 030024China China Institute for Radiation Protection Taiyuan 030006China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024China

This study evaluated the bioaugmentation potential of a quinoline-degrading strain Pseudomonas citronellolis LV1 inoculation into activated sludge for treating quinoline wastewater, and results indicated the inoculation of LV1 in aerobic continuous MBBR could substantially improve the quinoline removal performance with an improved removal efficiency of 34% averagely when quinoline was used as the sole carbon and nitrogen source. Additionally, efficient removal of quinoline in enhanced MBBR occurred at the influent p H of 7.0–8.0, hydraulic retention time(HRT) of 24–28 h and influent quinoline concentration of 100–700 mg·L^(-1). High-throughput sequencing analysis indicated that bioaugmentation could increase microbial diversity and shape the microbial community structure. Although the inoculant LV1 did not remain its dominance in stage Ⅲ, bioaugmentation indeed induced the formation of effective microbial community, and the indigenous microbes including Flavobacterium, Pseudoxanthomonas,Pseudomonas, Vermamoeba, Dyadobacter and Sphingomonas might play the key role in quinoline *** to the PICRUSt, the enhanced genes encoding aromatic ring-cleavage enzyme, especially for Nheterocyclic ring-cleavage enzymes, could lead to the improved removal performance of quinoline in bioaugmentation stage. Moreover, the enhanced MBBR treated well actual coking wastewater, as indicated by high removal performance of quinoline, phenol and COD.

关键词： Aerobic quinoline degradation Pseudomonas citronellolis LV1 Bioaugmentation Microbial community Coking wastewater

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Region-wide glacier area and mass budgets for the Shaksgam River Basin,Karakoram Mountains,during 2000–2016

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Journal of Arid Land 2021年第2期13卷 175-188页

作者： wang Panpan LI Zhongqin XU Chunhai wang puyu College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China State Key Laboratory of Cryospheric Sciences/Tianshan Glaciological Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

The Karakoram Mountains are well known for their widespread surge-type glaciers and slight glacier mass *** the one hand,glaciers are one of the sensitive indicators of climate change,their area and thickness will adjust with climate *** the other hand,glaciers provide freshwater resources for agricultural irrigation and hydroelectric generation in the downstream areas of the Shaksgam River Basin(SRB)in western *** shrinkage of glaciers caused by climate change can significantly affect the security and sustainable development of regional water *** this study,we analyzed the changes in glacier area from 2000 to 2016 in the SRB using Landsat TM(Thematic Mapper)/ETM+(Enhanced Mapper Plus)/OLI(Operational Land Imager)*** is shown that the SRB contained 472 glaciers,with an area of 1840.3 km2,in *** glacier area decreased by 0.14%/a since 2000,and the shrinkage of glacier in the southeast,east and south directions were the most,while the northeast,north directions were the ***-covered area accounted for 8.0%of the total glacier *** estimated elevation and mass changes using the 1 arc-second SRTM(Shuttle Radar Topography Mission)DEM(Digital Elevation Model)(2000)and the resolution of 8 m HMA(High Mountain Asia)DEM(2016).An average thickness of 0.08(±0.03)m/a,or a slight mass increase of 0.06(±0.02)m w.e./a has been obtained since *** found thinning was significantly lesser on the clean ice than the debris-covered *** addition,the elevation of glacier surface is spatially heterogeneous,showing that the accumulation of mass is dominant in high altitude regions,and the main mass loss is in low altitude regions,excluding the surge-type *** surge-type glaciers,the mass may transfer from the reservoir to the receiving area rapidly when surges,then resulting in an advance of glacier *** main surge mechanism is still unclear,it is worth noting that the surge did not increase the glacier mass in this study.

关键词： glacier mass balance SRTM DEM HMA DEM Karakoram Mountains

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Glacier Volume Calculation from Ice-Thickness Data for Mountain Glaciers—A Case Study of Glacier No. 4 of Sigong River over Mt. Bogda, Eastern Tianshan, Central Asia

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Journal of Earth Science 2014年第2期25卷 371-378页

作者： puyu wang Zhongqin Li Wenbin wang Huilin Li Feiteng wang State Key Laboratory of Cryospheric Sciences Tianshan Glaciological Station Cold and Arid Region Environment and Engineering Research Institute Chinese Academy of Sciences College of Geography and Environment Science Northwest Normal University

The determination of total glacial volume is important for the observation of climatic change and its consequences such as global sea-level rise. The tongue area of Glacier No. 4 of Sigong River over Mt. Bogda, eastern Tianshan was surveyed by ground-penetrating radar （GPR） and real time kinematic （RTK）-global positioning system （GPS） during the summer campaign 2009. In order to calculate the glacier volume, both co-kriging algorithm and estimation based on the theory of perfectly plastic material were employed. Results indicated that the ice-thickness distribution of the investigated glacier ranges from 0 to 105.0 m, with the mean thickness of 27.6 m in 2009. The corresponding ice volume was -0.076 km3 （-0.068 km3 water equivalent）. The bedrock topography shows more undulating than the glacier surface. The difference of the calculated ice volume in this study and the estimated value from the empirical formula is large. Therefore, it is urgent to validate the applicability of the ex- isting empirical formula.

关键词： ice volume ice-thickness GPR Glacier No. 4 of Sigong River Tianshan.

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Nyquist Stability Analysis and Capacitance Selection for DC Current Flow Controllers in Meshed Multi-terminal HVDC Grids

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CSEE Journal of Power and Energy Systems 2021年第1期7卷 114-127页

作者： puyu wang Shihua Feng Pengcheng Liu Ningqiang Jiang Xiao-Ping Zhang School of Automation Nanjing University of Science&Technology(NUST)Nanjing 210094China School of Engineering University of BirminghamEdgbastonBirmingham B152TTUnited Kingdom

Controllability of DC current/power flow is essentialin multi-terminal HVDC (MTDC) grids, particularly for theMTDC grids in a meshed topology. In this paper, consideringmeshed MTDC (M2TDC) grids with the installation of twoline/multi-lineDC current flow controllers (CFCs), a small-signalmodel of the DC CFCs integrated M2TDC grids is derived,studying the impact of the power losses of the DC CFC andtheir influence on the analysis of energy exchanges. The systemstability analysis is analysed using the Nyquist diagram, which ismore suitable for analyzing complex nonlinear systems with morecompact and reliable indicators of stability in comparison withgain/phase margins shown in the Bode diagram. In addition, aselection method of the interconnected capacitor of the DC CFCis proposed under different operating conditions. The impact ofthe switching frequencies of the DC CFC on the control ranges ofthe DC current flows is analyzed. The effectiveness of the Nyquistanalysis and the capacitance selection method is verified bysimulation studies using PSCAD/EMTDC. The obtained control ranges of the DC CFC with different switching frequenciesand capacitances would be useful for practical engineeringapplications.

关键词： Capacitance selection method control ranges DC current flow controller(CFC) meshed multi-terminal HVDC(M2TDC)grid Nyquist stability analysis small-signal modelling switching frequencies

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Spatial variability of glacial changes and their effects on water resources in the Chinese Tianshan Mountains during the last five decades

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Journal of Arid Land 2015年第6期7卷 717-727页

作者： wang puyu LI Zhongqin HUAI Baojuan wang Wenbin LI Huilin wang Lin State Key Laboratory of Cryospheric Sciences/Tianshan Glaciological Station Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences College of Geography and Environmental Science Northwest Normal University

Changes in glaciers in the Chinese Tianshan Mountains have been analyzed previously. However, most previous studies focused on individual glaciers and/or decentralized glacial basins. Moreover, a majority of these studies were published only in Chinese, which limited their usefulness at the international level. With this in mind, the authors reviewed the previous studies to create an overview of glacial changes in the Chinese Tianshan Mountains over the last five decades and discussed the effects of glacial changes on water resources. In response to climate change, glaciers in the Tianshan Mountains are shrinking rapidly and are ca. 20% smaller on average in the past five decades. Overall, the area reduction of glacial basins in the central part of the Chinese Tianshan Mountains is larger than that in the eastern and western parts. The spatial differentiation in glacial changes are caused by both differences in regional climate and in glacial factors. The effects of glacial changes on water resources vary in different river basins due to the differences in glacier distribution, characteristics of glacial change and proportion of the glacier meltwater in river runoff.

关键词： Chinese Tianshan Mountains climate change glacial change regional differences water resources

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Control and protection strategy for MMC MTDC system under converter-side AC fault during converter blocking failure

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Journal of Modern Power Systems and Clean Energy 2014年第3期2卷 272-281页

作者： puyu wang Xiao-Ping ZHANG Paul F.COVENTRY Zhou LI University of Birmingham Birmingham B152TTUK National Grid Warwick CV346DAUK Z.LISoutheast UniversityNanjing 210096China

This paper investigates a control and protection strategy for a four-terminal modular multilevel converter(MMC)based high-voltage direct current(HVDC)system under a converter-side AC *** on the system operating condition,a control and protection strategy against the fault with normal blocking of the converter is *** practical,applications encountering such a fault,the MMC at the fault side may experience different conditions of blocking *** blocking failures may occur on:①the whole converter;②one converter arm;③one sub-module(SM)/several SMs of one converter arm;④other *** phenomenon of the multi-terminal HVDC(MTDC)system following the fault is analyzed under the first three conditions with real-time simulations using the real-time digital simulator(RTDS).Based on the impact of different conditions on the MTDC system,the necessity of utilizing special control and protection is discussed.A special control and protection strategy is proposed for emergency conditions,and its effectiveness is verified by real-time simulation results.

关键词： Converter blocking failure Converter-side AC fault Control and protection Modular multilevel converter(MMC) Multi-terminal high-voltage direct current(MTDC) Real-time digital simulation

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Five decades of glacier changes in the Hulugou Basin of central Qilian Mountains, Northwest China

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Journal of Arid Land 2015年第2期7卷 159-165页

作者： Hui CHEN ZhongQin LI puyu wang ZhongPing LAI RenSheng CHEN BaoJuan HUAI College of Geography and Environmental Science Northwest Normal University Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences

The Heihe River Basin is the second largest inland river basin in the arid regions of Northwest China. Glaciers provide a large proportion of water resources for human production and living. Studies of glacier changes and their impact on water resources in the arid lands are of vital importance. A joint expedition was carried out in 2010 for investigating glaciers in the Hulugou Basin, which is located in the upper reaches of Heihe River. There- fore, glacier changes in the Hulugou Basin of central Qilian Mountains during the past 50 years were analyzed in this study by comparing topographic maps, satellite images, digital elevation models and field observation data from different periods. Results showed that the total area of the 6 glaciers in the Hulugou Basin decreased by 0.590±0.005 km^2 during the period 1956-2011, corresponding to a loss of 40.7% over the total area in 1956. The average area reduction rate of the 6 glaciers is 0.011 km^2/a. During the past five decades, the glacier shrinkage was accelerated. The changes in glacier ice surface elevation ranged from -15 to 3 m with an average thinning of 10±8 m or an annual decrease of 0.23±0.18 m （0.20±0.15 m/a water equivalent） for the period 1956-2000. The area of Shiyi Glacier in the Hulugou Basin decreased from 0.64 km^2 in 1956 to 0.53 km2 in 2011 with a reduction rate of 17.2%. The Shiyi Glacier had been divided into two separated glaciers because of severe melting. Comparative analysis showed that glacier shrinkage in the Hulugou Basin is more serious than that in the other regions of Qilian Mountains.

关键词： glacier change ice surface elevation change climate change Shiyi Glacier Hulugou Basin

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High-precision measurements of the inter-annual evolution for Urumqi Glacier No.1 in eastern Tien Shan,China

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Research in Cold and Arid Regions 2021年第6期13卷 474-487页

作者： ChunHai Xu ZhongQin Li JianXin Mu puyu wang FeiTeng wang State Key Laboratory of Cryospheric Science/Tien Shan Glaciological Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China National Cryosphere Desert Data Center Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China

High-precision measuring of glacier evolution remains a challenge as the available global and regional remote sensing techniques cannot satisfactorily capture the local-scale processes of most small-and medium-sized mountain *** this study,we use a high-precision local remote sensing technique,long-range terrestrial laser scanning(TLS),to measure the evolution of Urumqi Glacier No.1 at an annual *** found that the dense point clouds derived from the TLS survey can be used to reconstruct glacier surface terrain,with certain details,such as depressions,debris-covered areas,and supra-glacial drainages can be *** glacier experienced pronounced thickness thinning and continuous retreat over the last four mass-balance years(2015−2019).The mean surface slope of Urumqi Glacier No.1 gradually steepened,which may increase the removal of glacier *** glacier was deeply incised by two very prominent primary supra-glacial rivers,and those rivers presented a widening *** networks of supra-glacial channels had a significant impact on accelerated glacier mass ***-precision measuring is of vital importance to understanding the annual evolution of this type of glacier.

关键词： glacier thickness change front variation supra-glacial drainage pathway long-range terrestrial laser scanning(TLS) climate change

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Impact of the PV Location in Distribution Networks on Network Power Losses and Voltage Fluctuations with PSO Analysis

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CSEE Journal of Power and Energy Systems 2022年第2期8卷 523-534页

作者： puyu wang Fangyu Liang Jinyuan Song Ningqiang Jiang Xiao-Ping Zhang Ling Guo Xinxin Gu School of Automation Nanjing University of Science&Technology(NUST)Nanjing 210094JiangsuChina School of Engineering University of BirminghamEdgbastonBirmingham B152TTUnited Kingdom Nanjing GWDR Relays Technologies Co. Nanjing 210032JiangsuChina

Increased grid integration of photovoltaic(PV)has aggravated the uncertainty of distribution network *** a distribution network with PV,the impact of the PV location on the network power losses and voltage fluctuations is investigated with analytical derivations reflected by the line *** approaches of the PV location with consideration of two aspects,i.e.,minimum network power losses and minimum voltage fluctuations,are analyzed.A particle swarm optimization(PSO)algorithm is used to synthesize an optimal compromised solution so as to determine the PV location.A 10 kV distribution network with one PV is established on the time-domain simulation environment PSCAD/*** simulation results justify the theoretical analysis and indicate that when the active power of the PV is more/less than twice that of the overall loads/end loads,the network power losses and node voltage fluctuations are both minimum when the PV is integrated into the head/tail end of the *** the active power of the PV is between the above two conditions,nodes t/f can be identified for the integration of the PV between the head/end nodes of the network to achieve the minimum network power losses/voltage fluctuations,*** effectiveness of the proposed optimization approach is verified and can provide a reference for selecting the PV location in the distribution network.

关键词： Distribution network network power losses particle swarm optimization(PSO) PV location voltage fluctuations

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Multi-decadal variations in glacier flow velocity and the influencing factors of Urumqi Glacier No.1 in Tianshan Mountains, Northwest China

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Journal of Arid Land 2017年第6期9卷 900-910页

作者： wang puyu LI Zhongqin XU Chunhai XING Wucheng ZHOU Ping ZHANG Hui State Key Laboratory of Cryosphere Science/Tianshan Glaciological Station Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences College of Geography and Environment Science Northwest Normal University

Urumqi Glacier No. 1 is a representative glacier in the inland areas of Central Asia and is the only Chinese reference glacier in the World Glacier Monitoring Service. In this study, we explored multi-decadal variations in the flow velocity of the glacier and the influencing factors based on continuous field observations and path coefficient analysis. Results show that the glacier flow velocity decreased from 5.5 m/a in 1980/1981 to 3.3 m/a in 2010/2011. The annual variation in the direction of glacier flow velocity in the western branch and eastern branch was less than 1°–3°, and the change of glacier flow velocity in the western branch was more dramatic than that in the eastern branch. Glacier flow velocity was influenced by glacier morphology（including glacier area, glacier length, and ice thickness）, glacier mass balance and local climate conditions（air temperature and precipitation）, the glacier morphology being the leading factor. The long-term flow velocity data set of Urumqi Glacier No. 1 contributes to a better understanding of glacier dynamics within the context of climatic warming.

关键词： glacier flow velocity glacier change path coefficient analysis Urumqi Glacier No.1 Chinese Tianshan Mountains

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