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Potential influence of overwintering benthic algae on water quality

Journal of Environmental Sciences 2022年第7期34卷 58-70页

作者： Lefan Yao Yuansheng Huang Lei Chen yiliang he School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China National Engineering Research Center of Urban Water Resources Shanghai 200082China

Overwintering benthic algae not only directly impact drinking water safety, but also affect the algae recruitment in warm spring seasons. Thus, understanding the characteristics of overwintering benthic algae can provide scientific references for formulating preventative strategies of reasonable water resource. However, they have received less attention. In this study, the spatiotemporal variation of benthic algae and their harmful secondary metabolites were studied from autumn to summer in Qingcaosha Reservoir. Benthic algae(picophytobenthos accounting for 55.42%) had a high biomass during overwintering, and the groups of overwintering benthic algae included pico-Cyanobacteria, pico-Cryptomonas, pico-Chlorophyta, pico-Diatoms, Cyanobacteria, Chlorophyta, Cryptomonas and Diatoms, which were consistent with the planktonic algae species in warm seasons. In oligotrophic or mesotrophic water bodies, micronutrients of iron and manganese were key nutrient factors influencing the biomass of benthic algae. Furthermore, picophytobenthos were important potential contributors of harmful secondary metabolites. The content of microcystins, anatoxin-a, geosmin and 2-methylisoborneol in sediment were 15.75 μg/kg ·FW, 48.16 μg/kg ·FW, 3.91 ng/kg ·FW, and 11.76 ng/kg ·FW during winter, which had potential to be released into water bodies to impact water quality. These findings indicate that water quality monitoring programs need to consider sediment in winter as a potential source of toxins and preventative measures to prevent excessive proliferation of algae should be implemented in winter.

关键词： Benthic algae Picophytobenthos Winter Harmful secondary metabolites

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Fhotocatalytic degradation of polybrominated diphenyl ethers in pure water system

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Frontiers of Environmental Science & Engineering 2016年第2期10卷 229-235页

作者： Min ZHANG Jian LU yiliang he P. Chris WILSON School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Indian River Research and Education Center University of Florida Fort Pierce FL 34945 USA

Due to the low water solubility of polybromi- nated diphenyl ethers, organic solvent is usually added into the oxidation system to enhance the removal efficiency. In this study the photocatalytic degradation of decabromodi- phenyl ether （BDE209）, a type ofpolybrominated diphenyl ether used throughout the world, in pure water without the addition of organic solvent was investigated. In the pure water system, BDE209 was not dissolved but dispersed as nano-scale particles with a mean diameter of 166 nm. Most of BDE209 （〉 98%） were removed within 4 h and the final debromination ratio was greater than 80%. Although the addition of organic solvent （tetrahydrofuran, THF） could lead to a relatively high BDE209 degradation rate, the final debromination ratio （〈 50%） was much lower than that in pure water system. Major oxidation inter- mediates of tetrahydrofuran, including tetrahydro-2-fura- nol and y-butyrolactone, were detected indicating the engagement of THF in the BDE209 degradation process. The photocatalytic degradation of BDE209 in the pure water system followed first-order kinetics. The BDE209 degradation rate constant increased from 0.0011 to 0.0023 min-1 as the pH increased from 3 to 9.

关键词： polybrominated diphenyl ethers photocataly-tic degradation solvent

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Comparison of quartz sand, anthracite, shale and biological ceramsite for adsorptive removal of phosphorus from aqueous solution

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Journal of Environmental Sciences 2014年第2期26卷 466-477页

作者： Cheng Jiang Liyue Jia Bo Zhang yiliang he George Kirumba School of Environmental Science and Engineering Shanghai Jiao Tong University School of Urban Construction Hebei University of Engineering

The choice of substrates with high phosphorus adsorption capacity is vital for sustainable phosphorus removal from waste water in constructed wetlands. In this study, four substrates were used： quartz sand, anthracite, shale and biological ceramsite. These substrate samples were characterized by X- ray diffractometry and scanning electron microscopy studies for their mineral components （chemical components） and surface characteristics. The dynamic experimental results revealed the following ranking order for total phosphorus （TP） removal efficiency： anthracite 〉 biological ceramsite 〉 shale 〉 quartz sand. The adsorptive removal capacities for TP using anthracite, biological ceramsite, shale and quartz sand were 85.87, 81.44, 59.65, and 55.98 mg/kg, respectively. Phosphorus desorption was also studied to analyze the substrates＇ adsorption efficiency in wastewater treatment as well as the substrates＇ ability to be reused for treatment. It was noted that the removal performance for the different forms of phosphorus was dependent on the nature of the substrate and the adsorption mechanism. A comparative analysis showed that the removal of particulate phosphorus was much easier using shale. Whereas anthracite had the highest soluble reactive phosphorus （SRP） adsorptive capacity, biological ceramsite had the highest dissolved organic phosphorus （DOP） removal capacity. Phosphorus removal by shale and biological ceramsite was mainly through chemical adsorption, precipitation or biological adsorption. On the other hand, phosphorus removal through physical adsorption （electrostatic attraction or ion exchange） was dominant in anthracite and quartz sand.

关键词： quartz sand anthracite shale biological ceramsite phosphorus constructed wetlands

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Metabolites change of Scenedesmus obliquus exerted by AgNPs

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Journal of Environmental Sciences 2019年第2期31卷 310-318页

作者： Pu Wang Bo Zhang Hui Zhang yiliang he Choon Nam Ong Jun Yang School of Environmental Science & Engineering Shanghai Jiaotong University School of Municipal and Environmental Engineering Lanzhou Jiaotong University NUS Environmental Research Institute National University of Singapore

With increasing emission of silver nanoparticles(AgNPs) into the environment, it is important to understand the effects of ambient concentration of AgNPs. The biological effects of AgNPs on Scenedesmus obliquus, a ubiquitous freshwater microalgae, was evaluated. AgNPs exerted a minor inhibitory effect at low doses. Non-targeted metabolomic studies were conducted to understand and analyze the effect of AgNPs on algal cells from a molecular perspective. During the 48 hr of exposure to AgNPs, 30 metabolites were identified, of which nine had significant changes compared to the control group. These include D-galactose, sucrose, and *** carbohydrates are involved in the synthesis and repair of cell walls. Glycine, an important constituent amino acid of glutathione, increased with AgNP exposure concentration increasing, likely to counteract an increased intracellular oxidative stress. These results provide a new understanding of the toxicity effects and mechanism of AgNPs. These metabolites could be useful biomarkers for future research, employed in the early detection of environmental risk from AgNPs.

关键词： Silver nanoparticles (AgNPs) Scenedesmus obliquus Metabolomics Molecular mechanism

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Effects of stable aqueous fullerene nanocrystal (nC_(60)) on Daphnia magna:Evaluation of hop frequency and accumulations under different conditions

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Journal of Environmental Sciences 2011年第2期23卷 322-329页

作者： Xianji Yao yiliang he Bo Zhang Yongsheng Chen Joseph B. Hughes School of Environmental Science and Technology Shanghai Jiao Tong University Shanghai 200240 China. School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA College of Fisheries and Life Science Shanghai Ocean University Shanghai 201306 China

We investigated the effects of environmental factors and properties of water-stable crystal fullerene （nC60） on the uptake of nC60 by Daphnia magna based on known accumulation in our laboratory. This study was performed for seven days using different environmental factors including temperature, pH, water hardness, concentration （density of particle）, and particle size. Results demonstrated that body burden of C60 increased with time in all experiments. Body burden of C60 increased with increasing concentration and particle size, and uptake of particles 〉100 nm reached their maximums more quickly than those 〈100 nm. Under high hardness in aqueous systems with lower pH and high temperature, uptake was higher than those under opposite conditions. Uptake in all batch tests reached balance within five days. Both nC60 properties and environmental factors influenced uptake of nC60 by D. magna in an aqueous system. Additionally, environmental factors may have affected accumulation by changing nC60 properties, which are critical to understand the accumulation of fullerenes in aqueous systems.

关键词： C60 fullerene Daphnia magna uptake bioaccumulation

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Behavior of aqueous stable colloidal nano-C60 aggregates exposed to TX100 micelles under different environmental conditions

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Frontiers of Environmental Science & Engineering 2015年第2期9卷 197-205页

作者： Jing HUO Ye YU Ling GE Bo ZHANG yiliang he School of Environmental Science & Engineering Shanghai Jiaotong University Shanghai 200240 China

C60, as one of carbon nanomaterials widely used in various fields, could be released into the water environment thus exerting some potential health risks to human beings. This work examined the behavior of aqueous stable colloidal nano-C60 （nC60） aggregates under different environmental conditions including Polyethylene glycol octylphenol ether （TX100） micelles concentration, pH, and reaction time when exposed to TX100micelles. Results show that the nC60 aggregates became more dispersive and restored the capability of generating the singlet oxygen when exposed to TX100 micelles. With the increase of TX100 concentration, smaller average size of nC60 aggregates was observed in dynamic light scattering （DLS） analysis, the fluorescence intensity of TX100 was more quenched by nC60 aggregates, and the kinetic rate constant of generating the singlet oxygen for nC60 aggregates was improved. The mean size of nC60 aggregates in the presence of TX 100 had no obvious variations when the pH ranged from 4 to 8. The longer reaction time between nCro aggregates and TX100 led to a higher kinetic rate constant of generating the singlet oxygen. Collective data suggest that variations in physicochemical properties of nC60 aggregates are strongly dependent on the surrounding media under different environmental conditions and directly govern nC60＇S transport behavior and potential toxicity.

关键词： Keywords nano-C60 (nC60) aggregates photochemicalreactivity artificial biological membrane

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heavy metals in a typical city-river-reservoir system of East China:Multi-phase distribution,microbial response and ecological risk

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Journal of Environmental Sciences 2022年第2期34卷 343-354页

作者： Jun Yang Mingrui Zhou Kaifeng Yu Karina Yew-Hoong Gin Muhammad Hassan yiliang he School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China NUS Environmental Research Institute National University of Singapore1-Create Way#15-02 Create TowerSingapore 138602Singapore China-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai 200240China Department of Civil and Environmental Engineering National University of Singapore1 Engineering Drive 2Singapore 117576Singapore Ecology and Chemical Engineering Department South Ural State UniversityLenin Prospect 76Chelyabinsk 454080Russian Federation

The rapid construction of artificial reservoirs in metropolises has promoted the emergence of city-river-reservoir systems *** study investigated the environmental behaviors and risks of heavy metals in the aquatic environment of a typical system composed of main watersheds in Suzhou and Jinze Reservoir in *** shown that Mn,Zn and Cu were the dominant metals detected in multiple ***,Mn and Zn were mainly presented in exchangeable fraction and exhibited high *** proportion and high mobility of metals were found in suspended particulate matter(SPM),suggesting that SPM can greatly affect metal multi-phase distribution ***,city system(Ci S)exhibited more serious metal pollution and higher ecological risk than river system(Ri S)and reservoir system(Re S)owing to the diverse emission *** S and Re S were regarded as critical pollution source and sink,respectively,while Ri S was a vital transportation *** community in sediments exhibited evident spatial variation and obviously modified by exchangeable metals and *** particular,Bacteroidetes and Firmicutes presented significant positive correlations with most exchangeable *** assessment implied that As,Sb and Ni in water may pose potential carcinogenic risk to human ***,Re S was in a fairly safe *** was the main risk contributor in SPM,while Cu,Zn,Ni and Sb showed moderate risk in ***,Hg,Sb and Ci S were screened out as priority metals and system,*** attention should be paid to these priority issues to promote the sustainable development of the watershed.

关键词： heavy metal Multi-phase Chemical fraction City-river-reservoir system Microbial community

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Fluorescence detection of phosphate in an aqueous environment by an aluminum-based metal-organic framework with amido functionalized ligands

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Frontiers of Environmental Science & Engineering 2022年第12期16卷 111-120页

作者： Peng Li Lingqian Dong Han Jin Jingren Yang Yonghui Tu Chao Wang yiliang he School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China China-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai200240China Department of Instrument Science and Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai200240China

The on-site monitoring of phosphate is important for environmental *** phosphate detection methods are not appropriate to on-site monitoring owing to the use of complicated detection procedures,and the consequent high cost and maintenance requirements of the detection ***,a highly sensitive fluorescence-based method for phosphate detection with a wide detection range was developed based on a luminescent aluminum-based metal-organic framework(Al-MOF).The Al-MOF was prepared by introducing amine functional groups to conventional MIL to enhance phosphate binding,and exhibited excellent fluorescence properties that originated from the ligand-to-metal charge transfer(LMCT).The detection limit was as low as 3.25µmol/L(0.10 mg/L)and the detection range was as wide as 3–350µmol/L(0.10–10.85 mg/L).Moreover,Al-MOF displayed specific recognition toward phosphate over most anions and metal cations,even for a high concentration of the co-existent *** mechanism of phosphate detection was analyzed through the characterization of the combination of Al-MOF and phosphate,and the results indicated the high affinity between Al-O and phosphate inhibited that the LMCT process and recovered the intrinsic fluorescence of NH2−*** recovery of the developed detection method reached a satisfactory range of 85.1%–111.0%,and the feasibility of on-site phosphate detection was verified using a prototype sensor for tap water and lake water *** was demonstrated that the prepared Al-MOF is highly promising for on-site detection of phosphate in an aqueous environment.

关键词： Fluorescence Metal-organic framework Phosphate Detection Al-MOF

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新型带电作业平台的结构设计与仿真研究

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河北电力技术 2024年第1期43卷 34-40页

作者：李宁何义良赵建辉刘兆威田志国网河北省电力有限公司衡水供电分公司河北衡水053000

利用带电作业平台进行带电检修作业是维护架空输电线路正常运行的主要手段之一,而传统的带电作业平台仍存在结构或适用范围上的局限性。提出一种用于架空输电线路带电检修的新型带电作业平台,该平台的主体框架由方钢构成,易于制造且携... 详细信息

利用带电作业平台进行带电检修作业是维护架空输电线路正常运行的主要手段之一,而传统的带电作业平台仍存在结构或适用范围上的局限性。提出一种用于架空输电线路带电检修的新型带电作业平台,该平台的主体框架由方钢构成,易于制造且携带轻便,另外设有可任意调节旋转角度的载人板及开关保险装置,确保该平台在使用过程中方便灵活且安全可靠。建立了该带电作业平台的有限元模型,分析了不同工作需求下平台的力学性能,计算了作业人员利用平台进行带电作业时身体周围的电场强度分布情况,并提出相应防护建议。经现场运行试验,验证了新型带电作业平台的可行性与安全可靠性。

关键词：力电耦合带电作业结构设计力学仿真电场仿真

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Fenton oxidation of 2,4- and 2,6-dinitrotoluene and acetone inhibition

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Frontiers of Environmental Science & Engineering 2008年第3期2卷 326-332页

作者： yiliang he Bin ZHAO Joseph B.HUGheS Sung Soo HAN School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

The performances and kinetic parameters of Fenton oxidation of 2,4-and 2,6-dinitrotoluene(DNT)in water-acetone mixtures and explosive contaminated soil washing-out solutions were investigated at a laboratory *** experimental results show that acetone can be a significant hydroxyl radical scavenger and result in serious inhibition of Fenton oxidation of 2,4-and 2,*** no serious inhibition was found in contaminated soil washing-out solutions,longer reaction time was needed to remove 2,4-and 2,6-DNT completely,mainly due to the competition of hydroxyl *** oxidation of 2,4-and 2,6-DNT fit well with the first-order kinetics and the presence of acetone also reduced DNT’s degradation *** on the comparison and matching of retention time and ultraviolet(UV)spectra between high performance liquid chromatography(HPLC)and standards,the following reaction pathway for 2,4-DNT primary degradation was proposed:2,4-DNT→2,4-dinitro-benzaldehyde→2,4-dinitrobenzoic acid→1,3-dinitrobenzene→3-nitrophenol.

关键词： dinitrotoluenes Fenton oxidation acetone inhibition degradation kinetic reaction pathway

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