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Chemical characteristics of long-term acid rain and its impact on lake water chemistry:A case study in Southwest China

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Journal of Environmental Sciences 2024年第4期138卷 121-131页

作者： Liuyi Zhang Jiawang Shuxiao wang chunbo wang Fumo Yang Tingzhen Li Chongqing Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir Chongqing Three Gorges UniversityWanzhou 404000China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China College of Carbon Neutrality Future Technology Sichuan UniversityChengdu 610065China National Engineering Research Center on Flue Gas Desulfurization Chengdu 610065China

The chemical composition of acid rain and its impact on lake water chemistry in Chongqing,China,from 2000 to 2020 were studied in this *** regional acid rain intensity is affected jointly by the acid gas emissions and the neutralization of alkaline *** pH of precipitation experienced three stages of fluctuating decline,continuous improvement,and a slight *** pH showed inflection points in 2010,mainly due to the total control actions of SO_(2)and NO_(x)implemented in *** total ion concentrations in rural areas and urban areas were 489.08μeq/L and 618.57μeq/L,*** top four ions were SO_(4)^(2-),Ca^(2+),NH_(4)^(+)and NO_(3)^(-),which accounted for more than 90%of the total ion concentration,indicating the anthropogenic *** 2010,SO_(4)^(2-)fluctuated greatly while NO_(3)^(-)continued to rise;however,after 2010,both SO_(4)^(2-)and NO_(3)^(-)began to decline rapidly,with the rates of-12.03μeq/(L·year)and-4.11μeq/(L·year).Because the decline rate of SO_(4)^(2-)was 2.91 times that of NO_(3)^(-),the regional acid rain has changed from sulfuric acid rain to mixed sulfuric and nitric acid *** lake water is weakly acidic,with an average pH of 5.86,and the acidification frequency is 30.00%.Acidification of lake water is jointly affected by acid deposition and acid neutralization capacity of lake *** deposition has a profound impact on water acidification,and nitrogen(N)deposition,especially reduced N deposition,should be the focus of future research.

关键词： Acid rain Chemical composition Neutralization Nitrogen deposition Water acidification

Porous photothermal antibacterial antioxidant dual–crosslinked cryogel based on hyaluronic acid/polydopamine for non-compressible hemostasis and infectious wound repair

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Journal of Materials Science & Technology 2022年第26期121卷 207-219页

作者： chunbo wang Yuqing Liang Ying Huang Meng Li Baolin Guo Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Mechanical Behavior of Materials and Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China

Cryogel dressings with good absorption ability and photothermal antibacterial properties for preventing wound infections and treating infected wounds have attracted widespread *** this work,a series of cryogels with macroporous structure,antioxidant and photothermal properties were prepared based on adipic dihydrazide modified hyaluronic acid(HA-ADH),and dopamine(DA).The antioxidant properties,hemostatic properties,near infrared(NIR)assisted photothermal antibacterial ability provided by polydopamine,recyclable compression mechanical properties,and cytocompatibility were *** results demonstrated that the HA-ADH/DA cryogels have stable mechanical properties,great antibacterial properties against ***(EC)and methicillin-resistant ***(MRSA).The high swelling ratio due to the high water retention of HA equipped the cryogels with the capability of absorbing exuded blood and excessive tissue fluid in the infected full-thickness skin defect model of *** cryogels demonstrated good cytocompatibility and antioxidant performance through cell tests and 1,1-diphenyl-2-methylbenzohydrazino(DPPH)scavenging efficiency *** cryogels showed enhanced blood-clotting index(BCI)and better hemostatic ability in the mouse liver trauma model and the rat deep noncompressible liver defect model compared with gauze and gelatin ***,compared with commercial TegadermTMdressing in vivo,the HA-ADH/DA cryogels could greatly promote infected skin wound healing in a full-thickness infected skin defect wound *** summary,the macroporous HAADH/DA cryogels with good antioxidant,high swelling ratio,photothermal antibacterial property,and biocompatibility are a promising hemostatic material and wound healing dressing.

关键词： Dopamine-hyaluronic acid-based cryogels Antioxidant Photothermal antibacterial Wound healing Hemostasis

Spatiotemporal dynamics of cell abundance,colony size and intracellular toxin concentrations of pelagic and benthic Microcystis in Lake Caohai,China

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Journal of Environmental Sciences 2019年第10期31卷 184-196页

作者： Bing Feng chunbo wang Xingqiang Wu Cuicui Tian Meng Zhang Yingying Tian Bangding Xiao Key Laboratory of Algal Biology of Chinese Academy of Sciences Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072China Jiangxi Academy of Environmental Sciences Nanchang 330039 China Henan institute of technology Henan 453003 China

Lake Caohai has experienced extensive Microcystis blooms in recent years,and to improve its water quality,the local government carried out a series of water control *** better understand the dynamics of both pelagic and benthic Microcystis and their characteristics in Lake Caohai,we conducted a 1-year investigation from December 2015to December 2016 to gain a seasonal outlook on the distribution and dynamics of cell abundance,colony size and intracellular microcystins(MCs)of *** results indicated that the Microcystis bloom occupied primarily the northeastern region and then moved gradually from lakeshore to lake *** perennial southwesterly winds and the water inflow from northeast to southwest in Lake Caohai determined the spatiotemporal distribution of pelagic *** Microcystis was mainly distributed in the northeastern region in summer,occupied the lake center in autumn and then occupied the southeastern region in winter,determined by the sedimentation of pelagic Microcystis and the death of benthic *** colonies(20-60μm)overwintered more easily in both water column and *** concentrations of intracellular toxin of benthic Microcystis were observed to be significantly higher than those of pelagic *** might be because Microcystis synthesized large amount of MCs to acclimate to an unfavorable benthic *** knowledge on the dynamics of Microcystis expands our understanding of mechanisms underpinning the formation of Microcystis blooms.

关键词： Spatiotemporal dynamics Pelagic Microcystis Benthic Microcystis Cell abundance Colony size Intracellular MCs

Effects of organic carbon consumption on denitrifier community composition and diversity along dissolved oxygen vertical profiles in lake sediment surface

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Journal of Oceanology and Limnology 2020年第3期38卷 733-744页

作者： HONG Pei GONG Shihao wang chunbo SHU Yilin WU Xingqiang TIAN Cuicui Oscar Omondi DONDE CAI Pei WU Huaming XIAO Bangding Key Laboratory of Algal Biology of the Chinese Academy of Sciences Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China College of Life Sciences Anhui Normal UniversityWuhu 241000China

At present,the understanding of the dynamics of denitrifiers at different dissolved oxygen(DO)layers under organic carbon consumption within the surface sediments remains *** this study,high-throughput sequencing and quantitative PCR targeting nirS gene were used to analyze the denitrifier abundance dynamics,community composition,and structure for aerobic(DO 0.5-6.9 mg/L),hypoxic-anoxic(DO 0-0.5 mg/L),and anoxic(DO 0 mg/L)layers in surface sediments under organic carbon *** on the analysis of nirS gene abundance,the values of denitrifying bacteria decreased with organic carbon consumption at different DO *** the bacterial species abundance at the genus level were compared between the high-carbon and low-carbon sediments,there was significant increase in 6 out of 36,7 out of 36 and 6 out of 36 genera respectively for the aerobic,hypoxic-anoxic and anoxic *** the other hand,14 out of 36,9 out of 36 and 15 out of 36 genera showed significant decrease in bacterial species abundance respectively for the aerobic,hypoxic-anoxic and anoxic ***,14 out of 36,20 out of 36,and 15 out of 36 genera had no change in bacterial species abundance respectively for the aerobic,hypoxic-anoxic,and anoxic *** indicates that the carbon utilization ability of different denitrifiers on each DO layers was generally different from each *** of denitrifying bacteria also presented significant differences in different DO layers between the high-and low-carbon content sediment ***,under the high-carbon and low-carbon content,the abundance of nirS gene showed a high peak within the hypoxic-anoxic regions,suggesting that this region might be the main distribution area for the denitrifying bacteria within the surface ***,community of unique denitrifiers occurred in different DO layers and the adaptive changes of the denitrifier community followed the organic carbon consumption.

关键词： eutrophic freshwater lake surface sediments dissolved oxygen profi les denitrifier organic carbon consumption

Improved lakeshore sediment microenvironment and enhanced denitrification efficiency by natural solid carbon sources

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International Journal of Sediment Research 2022年第6期37卷 823-832页

作者： Shihao Gong Oscar Omondi Donde Qijia Cai Xingqiang Wu Kezheng Song chunbo wang Pei Hong Bangding Xiao Cuicui Tian Institute of Hydrobiology Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Environmental Science Egerton University School of Ecology and Environment Anhui Normal University

At present, the high level of nitrate in tailwater of wastewater treatment plants(WWTPs) has continued to cause serious environmental problems. In current study, wood chips and bark, serving as natural solid carbon source(NSCS), were applied to enhance the denitrification capacity of lakeshore sediment to remove superabundant nitrate in tailwater. The results show that NSCS had a positive effect on denitrification process for lakeshore sediment and increased the total phosphorus removal capacity by 212%-601%. Comparatively, wood chips were better in enhancing denitrification ability of lakeshore sediment for a longer time. At the 70 th day, the nitrate elimination(NEL) of the wood chip-sediment integrated system(WSIS) was 20% and 9% higher than the control system(CS) and bark-sediment integrated system(BSIS), respectively. For the WSIS, the microbial activity and the abundance of nicotinamide adenine dinucleotide(NADH) were significantly increased, and the sediment anaerobic zone was rapidly formed,which were conducive to the denitrification of the sediment. At the DNA level, both groups presented an inconsistency in the abundance of functional denitrification genes with the NEL. At the enzyme level,wood chips significantly increased the nitrate and nitrite reductase activities of the sediment, and promoted denitrification. From the perspective of microbial communities, wood chips highly promoted the abundance of norank＿f＿BIrii41 Proteobacteria and Ruminclostridum more than other denitrifying and potential denitrifying bacteria in the process of sediment denitrification enhancement.

关键词： Natural solid carbon source Sediment Denitrification Nitrate elimination

The Carbonation Behaviors of Limestone Particle in Oxygen-Fuel Circulating Fluidized Bed O<sub>2</sub>/CO<sub>2 </sub>Flue Gas

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Journal of Power and Energy Engineering 2013年第2期1卷 1-7页

作者： Jianyu Shang Zhongliang Liu chunbo wang 1College of Environmental and Energy Engineering Beijing University of Technology Beijing China 2School of Energy and Power Engineering North China Electric Power University Baoding China. College of Environmental and Energy Engineering Beijing University of Technology Beijing China

Limestone powder is still applied as SO2 sorbent in emerging oxygen-fuel circulating fluidized bed boiler, but its carbonation in O2/CO2 flue gas is an unclear problem. For a better understanding of carbonation behaviors, the tube furnace heating system was built for simulating circulating fluidized bed boiler flue gas by regulating the supply of O, CO2, N2, SO2 and H2O, and Carbonation reaction was tested. Thermal gravimetric analysis and scanning electron microscopy were used. It was found that carbonation is closely related to temperature, CO2 concentration, impurities, water vapor, and cycle times;high temperature can promote carbonation process;high concentration of CO2 can inhibit the chemical reaction stage speed of carbonation process, but it has little effect on the final conversion rate;water vapor can increase the final conversion rate of carbonation;the cycle times will reduce the activity of carbonation. The presence of carbonation turns the traditional boiler flue gas indirect desulfurization model into indirect desulfurization mechanism which does not have a negative impact on SO2 removal efficiency.

关键词： Oxygen-Fuel Circulating Fluidized Bed Limestone Particle Carbonation Desulfurization Production Layer

Changes in the ecosystem structure and function of a cyanobacteria bloom-dominated,shallow lake after tenyear eutrophication management

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Journal of Oceanology and Limnology 2024年第6期42卷 1726-1740页

作者： Min PAN Jinyan DONG Zhizhong ZHANG Liyuan ZHANG Yanying GUO Jiaojiao YANG Licheng HUANG chunbo wang Kun SHAN Haijun wang Yongding LIU Dianchi Lake Ecosystem Observation and Research Station of Yunnan Province Kunming Dianchi&Plateau Lakes InstituteKunming 650228China Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake NetworksYunnan UniversityKunming 650500China Kunming Fisheries Research Institute Kunming 650021China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 401122China Institute of Hydrobiology Chinese Academy of SciencesWuhan 430072China

Large and shallow lakes are widely influenced by multiple anthropogenic stressors,including ***,diverse strategies of eutrophication management are needed to restore the lake *** Lake,a subtropical plateau lake in Yunnan Province,SW China,has long experienced the effects of eutrophication and cyanobacterial *** mitigate the eutrophication of Dianchi Lake,various efforts have been implemented since 2000,including reducing nutrient inputs,reestablishing aquatic macrophytes in lakeside zones,manipulating fishes and so ***,little is known about the changes in its ecosystem structure and function after long-term efforts of eutrophication management in the ***,this study on such changes was conducted by comparing the field data-based Ecopath models between 2009 and 2019,a decade marked by a rapid implementation of eutrophication management *** show that both top-down and bottom-up processes have influenced the ecosystem structure and ***,over this decade,nutrient reduction significantly reduced phytoplankton biomass by 49.4%.Nutrient recycling and path length in food web began to decrease,as indicated by the decrease of Finn's cycling index and Finn's mean path ***,fishing management strategy has greatly changed the composition of fish assemblage,which was dominated by the small zooplantivorous fishes with ecological niche overlapping with *** general,the stability of the ecosystem has been decreasing,due to the dramatic decrease in zooplankton biomass(83.67%)and hence a collapse of the microbial loop in the food ***,we strongly advocate the persistent efforts to mitigate the risk of recurrent cyanobacteria blooms in Dianchi Lake,necessitating stricter regulation of nutrient levels and implementing effective fish population management techniques.

关键词： Dianchi Lake Ecopath ecosystem property cyanobacterial bloom nutrient reduction fish manipulation

蒸汽在PM表面凝结的紊流布朗核聚并理论与数值模拟

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中国电机工程学报 2018年第17期38卷 5126-5133页

作者：米行王春波华北电力大学能源动力与机械工程学院

以增加了蒸汽入口的脱硫塔喷淋空间为研究对象,构建PM相变核聚并反应器,研究了超细颗粒物凝结长大机制与脱除效果。通过建立超细颗粒物相变凝结增长动力学模型,同时引入全范围内超细惯性粒子的紊流聚并和布朗聚并核模型,研究蒸汽相变耦... 详细信息

以增加了蒸汽入口的脱硫塔喷淋空间为研究对象,构建PM相变核聚并反应器,研究了超细颗粒物凝结长大机制与脱除效果。通过建立超细颗粒物相变凝结增长动力学模型,同时引入全范围内超细惯性粒子的紊流聚并和布朗聚并核模型,研究蒸汽相变耦合紊流布朗运动脱除超细颗粒物的作用。进一步利用商业软件Fluent的UDF功能,将超细颗粒物相变凝结增长动力学模型写入颗粒群平衡模型中,探索了超细颗粒物在反应器内的沿程反应机理。结果表明：对比不添加蒸汽的超细颗粒物脱除效果,添加蒸汽可有效增加喷淋空间过饱和度,超细颗粒物在反应器入口的布朗运动和紊流运动较明显,大大提高了超细颗粒物的脱除效率。

关键词：超细颗粒物紊流聚并核布朗聚并核颗粒群平衡模型相变凝结增长

CFB锅炉内石灰石同时煅烧/硫化反应动力学及孔结构演变模拟

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中国电机工程学报 2019年第23期39卷 6952-6963页

作者：陈亮王春波华北电力大学能源动力与机械工程学院

综合考虑石灰石的分解、CaO烧结和硫化,建立石灰石同时煅烧/硫化反应的随机孔模型。模型计算结果与实验测试结果吻合良好,并采用该模型研究温度、粒径和SO2浓度等因素对同时煅烧/硫化反应动力学特性的影响。循环流化床内石灰石煅烧反应... 详细信息

综合考虑石灰石的分解、CaO烧结和硫化,建立石灰石同时煅烧/硫化反应的随机孔模型。模型计算结果与实验测试结果吻合良好,并采用该模型研究温度、粒径和SO2浓度等因素对同时煅烧/硫化反应动力学特性的影响。循环流化床内石灰石煅烧反应同时发生硫化反应,所生成的CaSO4阻碍了煅烧反应,主要通过两种机制:孔壁面CaSO4产物层阻碍CO2从煅烧部位向颗粒孔道扩散,以及CaSO4阻碍颗粒孔道内CO2向颗粒外扩散。硫化反应中,由于CaSO4的生成而导致的颗粒表层孔隙的快速堵塞是颗粒整体硫化速度下降、硫化程度低于理论值的主要原因。850~910℃范围内反应温度升高明显加速石灰石分解的速度;温度升高增加快速硫化反应阶段的反应速度,但由于颗粒表层以更快的速度发生堵塞而更早地进入慢速硫化反应阶段,导致反应进行到90min时的硫化转化率变化不大。颗粒粒径下降加速硫化反应速度;对于0.4%SO2气氛中850℃下的反应,粒径对煅烧速度在100s前后的影响不同。在100s之前,硫化反应进行程度较低,煅烧反应速度受CaSO4的阻碍作用弱,煅烧速度随粒径减小而增加;100s之后CaSO4对煅烧速度的阻碍作用显现,粒径越小,CaSO4积累量越大,对煅烧速度的阻碍越明显,致使100s后煅烧速度随粒径减小而下降。

关键词：石灰石煅烧硫化随机孔模型循环流化床