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Distribution, enrichment mechanism and risk assessment for fluoride in groundwater: a case study of Mihe-Weihe

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 6, doi: 10.1007/s11783-023-1670-8

Abstract:

● High fluorine is mainly HCO3·Cl-Na and HCO3-Na type.

Keywords： the Mihe-Weihe River Basin     Distribution characteristics of fluorine     Factors influencing fluoride     Enrichment    

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Water Diversion is Not to Blame for Phosphorus Enrichment in Taihu Lake

Zhiyuan Wang,Qiuwen Chen,Jianyun Zhang,Hanlu Yan,

Engineering doi: 10.1016/j.eng.2023.07.007

Abstract: The Water Diversion Project from the Yangtze River to Taihu Lake (WDYT) has been widely recognized as an urgent and effective engineering measure to increase water resources, ameliorate the hydrodynamics and water quality conditions, and safeguard the water supply of Taihu Basin. However, some previous studies claimed that WDYT has brought in allochthonous nutrients and should take responsibility for the dramatic increase in phosphorus loading of Taihu Lake in recent years, because Yangtze River has a higher average phosphorus concentration than Taihu Lake. To ensure correct public understanding and provide a critical response to the misconception about the source of phosphorus loading, we quantified contribution of water diversion from the Yangtze River to phosphorus loadings of Taihu Lake over the past twenty years. We reveal that WDYT only diverted 4.3% annually of total phosphorus input of Taihu Lake in the last decade and should not be responsible for the increase in phosphorus concentration and loading in Taihu Lake. We conclude that phosphorus input from the Huxi Region contribute 78% of phosphorus input of Taihu Lake and should be primarily responsible for the high phosphorus concentration of Taihu Lake. Our findings have provided constructive guidance for water resource management of Taihu Basin and phosphorus load control of the second stage of WDYT.
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Experimental investigation on possibility of oxygen enrichment by using gradient magnetic fields

CAI Jun, WANG Li, TONG Lige, SUN Shufeng, WU Ping

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 3,   Pages 271-276 doi: 10.1007/s11705-007-0049-x

Abstract: method that uses the interception effect of gradient magnetic field on oxygen molecules to realize enrichmentThus, continuous oxygen enrichment is realized.The enrichment degree of oxygen reaches 0.65% when the inlet and outlet air flows are 40 mL/min and 20When the gas temperature rises to 343 K, the enrichment degree drops to 0.32%; and when the maximal productdegree than other oxygen-enrichment methods using magnetic separation.
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the effect of nitrogen on mixed culture polyhydroxyalkanoate production toward high organic loading enrichment

Zhiqiang Chen, Lizhi Zhao, Ye Ji, Qinxue Wen, Long Huang

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 4, doi: 10.1007/s11783-019-1135-2

Abstract:

Enrichment history of PHA accumulating culture

Enrichment strategy toward higher PHA accumulation

Keywords： Polyhydroxyalkanoate (PHA)     Organic loading rate     Nitrogen content     Biomass growth     Enrichment history    

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Enrichment and transfer of polycyclic aromatic hydrocarbons (PAHs) through dust aerosol generation from

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 1, doi: 10.1007/s11783-023-1610-7

Abstract:

● Compositional patterns of PAHs in dust aerosol vary from soil during dust generation.

Keywords： Dust aerosols     Enrichment factors (EFs)     Polycyclic aromatic hydrocarbons (PAHs)    

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Mercury enrichment in

Chunhao Dai, Pufeng Qin, Zhangwei Wang, Jian Chen, Xianshan Zhang, Si Luo

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 1, doi: 10.1007/s11783-017-0892-z

Abstract: Mercury enrichment in response to elevated atmospheric mercury concentrations in the organs of rape (Mercury enrichment in response to elevated atmospheric mercury concentrations in the organs of rape (

Keywords： Open top chamber     Gaseous elemental mercury (GEM)     Soil Mercury     Brassica napus    

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Shale gas enrichment factors and the selection and evaluation of the core area

Wang Shejiao,Yang Tao,Zhang Guosheng,Li Denghua,Chen Xiaoming

Strategic Study of CAE 2012, Volume 14, Issue 6,   Pages 94-100

Abstract: Based on the analysis of shale gas reservoir characteristics and the enrichment factors we discuss the

Keywords： core area     selection and evaluation     enrichment factors     marine shale     shale gas    

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Fundamental and application of amphiphilic copolymers in high performance MF/UF membranes

Zhu Baoku,Cui Yue,Wang Jun,Wang Nachuan, Yao Zhikan,Zhu Liping

Strategic Study of CAE 2014, Volume 16, Issue 12,   Pages 87-93

Abstract: that， during the phase inversion process， amphiphilic copolymer migrated spontaneously to the membrane surface， resulting the enrichment of hydrophilic components in surface layer.

Keywords： amphiphilic copolymers     blend porous membrane     surface enrichment     hydrophilicity     anti-fouling    

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Effective enrichment of Zn from smelting wastewater via an integrated Fe coagulation and hematite precipitation

Zhan Qu, Ting Su, Yu Chen, Xue Lin, Yang Yu, Suiyi Zhu, Xinfeng Xie, Mingxin Huo

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 6, doi: 10.1007/s11783-019-1178-4

Abstract: 98.5% Zn was enriched from Zn-bearing smelting wastewater. 99.5% Fe was hydrothermally precipitated into hematite nanoparticles. Highly purified hematite nanoparticles were obtained. The residual Zn was 2169 mg/L, 290 times of that in smelting wastewater. Coagulation is commonly applied to treat Zn-bearing wastewater from smelting industries (smelting wastewater), and thus the Zn-bearing sludge was considerably produced, which should be solidified before safety disposal. Herein, we demonstrated a novel approach to recycle Zn effectively from smelting wastewater via an integrated Fe coagulation and hematite precipitation method. First, smelting wastewater was coagulated by adding ferric chloride to generate Fe/Zn-bearing sludge (sludge for short). Secondly, the sludge was dissolved to generate an acid solution containing 2.2 g/L of Zn and 39.2 g/L of Fe. Thirdly, the Fe/Zn-bearing solution was hydrothermally treated, and 89% of Fe was eliminated to highly purified hematite block, whereas the percentage of Zn lost was below 1.1%. Finally, the hematite precipitates were collected, and the supernatant was hydrothermally treated again with the addition of glucose. When the molar ratio of glucose to Fe in the supernatant was 1.5, over 99.5% of Fe was precipitated in hematite nanoparticles with a diameter of 10–100 nm, and the residual Fe was 21.5 mg/L. The loss of Zn was below 0.4%, and the residual Zn in the solution was 2169 mg/L, 290 times of that in the smelting wastewater. The major mechanism for Fe removal was the hydrolysis of ferric nitrate into hematite, which was promoted by nitrate consumption in glucose oxidation. This paper is the first report of an environment-friendly method for enriching Zn without generating any waste.

Keywords： Smelting wastewater     Hydrothermal     Hematite precipitation     Heavy metals    

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Enrichment of CO from syngas with Cu(I)Y adsorbent by five-bed VPSA

Shuna LI, Huawei YANG, Donghui ZHANG

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 4,   Pages 472-481 doi: 10.1007/s11705-013-1351-4

Abstract: Cu(I)Y adsorbent was prepared by reduction of Cu(II)Y which was prepared by ion exchange between the NaY zeolite and a solution of Cu(II) chloride. The dynamic adsorption capacity of Cu(I)Y for CO was calculated by adsorption breakthrough curve measured on a fixed bed at 30°C and 0.006 MPa (g) of CO partial pressure. The calculated CO adsorption capacity was 2.14 mmol/g, 37.5 times as much as that of NaY zeolite. The adsorption breakthrough curve experiment was also simulated with Aspen Adsorption software and the results were approximately consistent with experimental results. Then a five-bed VPSA process for separating CO from syngas on this adsorbent was dynamically simulated with Aspen Adsorption software with the adsorption pressure of 0.68 MPa (g) and the desorption pressure of -0.075 MPa (g). The results showed that CO was enriched from 32.3% to 95.16%–98.12%, and its recovery was 88.47%–99.44%.

Keywords： Cu(I)Y adsorbent     breakthrough curve     desorption     VPSA     simulation    

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Cell surface protein engineering for high-performance whole-cell catalysts

Hajime Nakatani,Katsutoshi Hori

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 1,   Pages 46-57 doi: 10.1007/s11705-017-1609-3

Abstract: Cell surface protein engineering facilitated by accumulation of information on genome and protein structureinvolves heterologous production and modification of cell surface proteins using genetic engineeringIn this field, cell surface display is a major technology by exposing target proteins, such as enzymes, on the cell surface using a carrier protein.The target proteins are fused to the carrier proteins that transport and tether them to the cell surface

Keywords： cell surface engineering     surface display     whole-cell catalysts     bioprocess    

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An Exploration of Surface Integrity Remanufacturing for Aeroengine Components

Qiao Xiang,Yong He,Ting-hong Hou

Frontiers of Engineering Management 2016, Volume 3, Issue 2,   Pages 107-114 doi: 10.15302/J-FEM-2016025

Abstract: Surface integrity is the major factor impacting on the operation quality, service life and reliabilityThe surface integrity of aeroengine component is damaged by the failures such as crack, deformation,It adopts advanced remanufacturing technologies to restore or improve the surface integrity and regenerateThis paper firstly puts forward the concept, namely surface integrity remanufacturing for aeroengineThe key remanufacturing technologies have been developed to repair the components with surface damages

Keywords： aeroengine component     surface integrity     remanufacturing     surface integrity remanufacturing    

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Review on mechanism and process of surface polishing using lasers

Arun KRISHNAN, Fengzhou FANG

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3,   Pages 299-319 doi: 10.1007/s11465-019-0535-0

Abstract: Laser polishing is a technology of smoothening the surface of various materials with highly intense laserWhen these beams impact on the material surface to be polished, the surface starts to be melted due tomelted material is then relocated from the ‘peaks to valleys’ under the multidirectional action of surfaceparameters such as beam intensity, energy density, spot diameter, and feed rate, different rates of surfacerelied for smoothening of initial topography of the surfaces irrespective of the complexity of the surface

Keywords： laser polishing     surface roughness     process parameters     mechanism    

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Tribological study on the surface modification of metal-on-polymer bioimplants

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0682-6

Abstract: The relationship between surface roughness and coefficient of friction (COF) under dry and lubricatedResults show that under dry test, friction coefficient is not reduced all the time with a decrease in surfaceUnder wet test, COF always decreases with reduction in surface roughness.by decreasing friction force and mitigating surface deterioration.By obtaining the optimal surface roughness and applying texturing technology, the tribological performance

Keywords： artificial joints     surface roughness     friction     surface texturing    

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Development of surface reconstruction algorithms for optical interferometric measurement

Dongxu WU, Fengzhou FANG

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 1,   Pages 1-31 doi: 10.1007/s11465-020-0602-6

Abstract: Optical interferometry is a powerful tool for measuring and characterizing areal surface topography inThis paper provides an in-depth perspective of surface topography reconstruction for optical interferometricThis paper also presents the new challenges that optical interferometry techniques are facing in surface

Keywords： surface topography     measurement     optical interferometry     coherence envelope     phase-shifting algorithm    

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Title Author Date Type Operation

Distribution, enrichment mechanism and risk assessment for fluoride in groundwater: a case study of Mihe-Weihe

Journal Article

Water Diversion is Not to Blame for Phosphorus Enrichment in Taihu Lake

Zhiyuan Wang,Qiuwen Chen,Jianyun Zhang,Hanlu Yan,

Journal Article

Experimental investigation on possibility of oxygen enrichment by using gradient magnetic fields

CAI Jun, WANG Li, TONG Lige, SUN Shufeng, WU Ping

Journal Article

the effect of nitrogen on mixed culture polyhydroxyalkanoate production toward high organic loading enrichment

Zhiqiang Chen, Lizhi Zhao, Ye Ji, Qinxue Wen, Long Huang

Journal Article

Enrichment and transfer of polycyclic aromatic hydrocarbons (PAHs) through dust aerosol generation from

Journal Article

Mercury enrichment in

Chunhao Dai, Pufeng Qin, Zhangwei Wang, Jian Chen, Xianshan Zhang, Si Luo

Journal Article

Shale gas enrichment factors and the selection and evaluation of the core area

Wang Shejiao,Yang Tao,Zhang Guosheng,Li Denghua,Chen Xiaoming

Journal Article

Fundamental and application of amphiphilic copolymers in high performance MF/UF membranes

Zhu Baoku,Cui Yue,Wang Jun,Wang Nachuan, Yao Zhikan,Zhu Liping

Journal Article

Effective enrichment of Zn from smelting wastewater via an integrated Fe coagulation and hematite precipitation

Zhan Qu, Ting Su, Yu Chen, Xue Lin, Yang Yu, Suiyi Zhu, Xinfeng Xie, Mingxin Huo

Journal Article

Enrichment of CO from syngas with Cu(I)Y adsorbent by five-bed VPSA

Shuna LI, Huawei YANG, Donghui ZHANG

Journal Article

Cell surface protein engineering for high-performance whole-cell catalysts

Hajime Nakatani,Katsutoshi Hori

Journal Article

An Exploration of Surface Integrity Remanufacturing for Aeroengine Components

Qiao Xiang,Yong He,Ting-hong Hou

Journal Article

Review on mechanism and process of surface polishing using lasers

Arun KRISHNAN, Fengzhou FANG

Journal Article

Tribological study on the surface modification of metal-on-polymer bioimplants

Journal Article

Development of surface reconstruction algorithms for optical interferometric measurement

Dongxu WU, Fengzhou FANG

Journal Article