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Environmental process of the deep-water lakes and approach to the protection of water resources on the Yunnan-Guizhou Plateau

Wan Guojiang

Strategic Study of CAE 2009, Volume 11, Issue 5,   Pages 60-71

Abstract:

It is of local, regional and global importance to understand the environmental changes on the Yunnan-Guizhou Plateau. Difference on bio-geochemical process of the sediment-water interface exists among lakes so that protection approaches to water resources vary. a. The coal mining in the catchment of Lake Aha causes Fe-Mn accumulation in the sediment leading to the seasonal secondary pollution. In anoxic condition, the sulphate deoxidization migrates to the upper layer of sediments which results in Fe2+ screening of the diffusive boundary layer. The Fe-Mn cycling is controlled by both the sediment-water geological interface and oxidation-reduction chemical interface. Controlling Fe-Mn release and reducing their flux into the lake, selecting good-quality water district and cleaning sludge are efficient ways to control pollutions. b. Paroxysmal deterioration of water quality in Lake Baihua appeared in autumn, 1994 in Guizhou. Analysis of incident cross-correlation water-quality indicators indicated that the "Lake Black Tide"  resulted from the coupling of bio-oxidation of depositional organic matters under the specific season and climatic conditions; pH-restraint of de-nitric process led to increase in NO-2 concentration. The water quality was expected to recover in times with the balancing of oxygen in waters, input of water flow and better weather conditions. This was confirmed by the late monitoring. c. The average sedimentation rate of Lake Erhai is 0.047 g ·cm-2 ·a-1. The Pb-isotopic compositions of recent sediments indicate that may have a stable source. The depositional organic matter originates mainly from the land. In the chemical processes of early diagenesis, the Corg vertical profiles of sediments show three stages "Deposition-Decomposition-Accumulation" . In the last 460 years, small-scope frequent fluctuation of δ13Corg and synchronically decreasing trends of δ13Cinorg and δ18Oinorg indicate an obvious influence of human activity in the catchment. Control of input flux of terrestrial organic matters into Lake Erhai is a fundamental strategy. d. Lake Chenghai in Yunnan is a moderate-eutrophic lake with a total ion concentration close to a low limit of saline lake. The atomic ratios of Horg/Corg and Corg/Norg indicate that the organic matters mainly stem from the endogenous plankton algae remains; there is a good synchronous relationship of the depositional fluxes between 210Pbex and Corg in the sedimentary records. In particular, the synchronizations over the time indicate the increase in the lake primary productivity. The Clean-Effect reflects an adjustive role of lake nature function in the lake eutrophication.

Keywords： regional environment     deep-water lakes     environmental process     radioactive trace     environmental bio-geochemistry    

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Cesium removal from radioactive wastewater by adsorption and membrane technology

Frontiers of Environmental Science & Engineering 2023, Volume 18, Issue 3, doi: 10.1007/s11783-024-1798-1

Abstract:

● Removal of cesium from radioactive wastewater is still a challenging

Keywords： Cesium     Adsorption     Membrane separation     Advanced liquid processing system     Fukushima nuclear accident    

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Assessment of mobile and potential mobile trace elements extractability in calcareous soils using different

Mohsen Jalali, Ziba Hurseresht

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 1, doi: 10.1007/s11783-019-1186-4

Abstract: In NH4OAc, DTPA, and EDTA, the possibility of re-adsorption of trace elements is low.Understanding trace elements mobility in soils, extracting agents, and their relationships with soilwhereas NaNO3 and CaCl2 have shown different behavior than other extracting agents for all studied traceThe speciation of extracted trace elements in solutions indicated that in the CaCl2, NaNO3, NH4NO3, andThe results of speciation of trace elements using NH4OAc, DTPA, and EDTA extracting agents showed that

Keywords： Mobility     Calcareous soils     Extracting agents     Trace elements    

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Preconcentration of trace elements by adsorption onto a niobium wire for electrothermal atomization atomic

Satoshi KANECO, Hiroaki KITANAGA, Hideyuki KATSUMATA, Tohru SUZUKI

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 4,   Pages 432-435 doi: 10.1007/s11705-012-1219-z

Abstract: In the present work, a new preconcentration method of trace elements by adsorption onto a niobium wire

Keywords： onto niobium wire     electrothermal atomization atomic absorption spectrometry     tungsten tube atomizer     trace    

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Assessing human bioaccessibility of trace contaminants in size-fractionated red mud, derived precipitates

Chunfeng Wang, Yanchen Zhu, Dan Yao, Guanfei Chen, Lianjun Wang

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 6, doi: 10.1007/s11783-017-0956-0

Abstract: The objective of this study was to provide insight into human exposure to trace contaminants bearingThe in vitro bioaccessibility behavior of trace contaminants was investigated with the PBET (physiologicallyThe results showed that total contents of trace contaminants and operation parameters, such as pH andAs for airborne particles (<38 µm size fractions), trace contaminants concentrations extracted by MGSEven though short-term and long-term leaching values of trace contaminants were relatively lower in the

Keywords： Bioaccessibility     Trace contaminants     Red mud     Precipitates     Geopolymeric blocks.    

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The energy-free purification of trace thallium(I)-contaminated potable water using a high-selective filter

Frontiers of Chemical Science and Engineering doi: 10.1007/s11705-023-2379-8

Abstract: Thallium is a highly toxic metal, and trace amount of thallium(I) (Tl+) in potable water could

Keywords： membrane adsorption     Prussian blue     energy-free filtration     potable water     trace thallium(I)    

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Biodegradation of trace pharmaceutical substances in wastewater by a membrane bioreactor

Longli BO, Taro URASE, Xiaochang WANG

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 2,   Pages 236-240 doi: 10.1007/s11783-009-0004-9

Abstract: The biodegradation of selected pharmaceutical micropollutants, including two pharmaceuticals with argued biodegradation, was studied by a lab-scale membrane bioreactor. The reaction kinetics and affecting factors were also investigated in this paper. Clofibric acid (CA) with contradictive biodegradation reported was degraded almost completely at different hydraulic retention times (HRTs) after adaptation to microorganisms. The biodegradation of CA was disturbed at low pH operation, while the activity of microorganisms recovered again after pH adjustment to neutral condition. Ibuprofen (IBP) degraded under neutral and acidic conditions. Removals of IBP and CA were zero-order and first-order reactions under high and low initial concentrations, respectively. Carbamazepine and diclofenac were not degraded regardless of HRTs and pH.

Keywords： pharmaceuticals     membrane bioreactor     activated sludge     reaction kinetics    

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PSS sorbents for removing trace hydrogen sulfide in methane

Limei ZHONG, Li ZHOU

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 3,   Pages 339-342 doi: 10.1007/s11705-010-0569-7

Abstract: Sorbents of the pressure swing sorption process (PSS) to remove trace amount of H S (190 ppm) contained

Keywords： pressure swing sorption     H2S     methane     carrier     absorbent    

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Error compensation for tool-tip trace during cutting of laminated paper for rapid prototyping

Yucheng DING, Changhe LI, Dichen LI, Guoxin YU

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2,   Pages 111-119 doi: 10.1007/s11465-009-0020-2

Abstract: Laminated object manufacturing (LOM) is one of the commercialized rapid prototyping (RP) processes, where a focused laser is usually used to cut the cross-section contours of a 3 D part and the grid hatchings of the part-exterior region on a sheet paper stack-wise. Using a laser beam as a cutter can be costly, and the thermal burning of a sheet paper along a laser scanning path can also cause an environment-polluting smoke. This paper presents a paper laminating RP system using a knife as the paper cutter instead of a laser beam. The knife holder is mounted through a radial bearing on the - positioning mechanism in such a way that the knife tip is eccentric to the bearing axis by a small distance (so-called offset). Therefore, the knife tip, which engages into the sheet paper during cutting, tends to follow the path of the -driven bearing axis by the error that depends on the path tangential and the eccentricity of the knife tip. A tractrix model is applied to describe the kinetic motion of the knife tip and a method is formulated to compensate for the tracing error of the eccentric knife tip by modifying the original cross-section contours of the part for each layer based on the tractrix equation. A study has also been performed regarding the effect of the knife tip geometry on the cutting notch of the sheet paper and on the roughness of the finished part.

Keywords： rapid prototyping     laminated object manufacturing     knife-cutting     tracing error    

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Review on the marine radioactive-pollution monitoring and assessment technology

Chen Liqi,He Jianhua1,Lin Wuhui,YuWen, MenWu

Strategic Study of CAE 2011, Volume 13, Issue 10,   Pages 34-39

Abstract:

To review the marine radioactive-pollution monitoring and assessmentnon-human species radiation protection and assessment were discussed, including the assessment of marine radioactive-pollution

Keywords： radioactive-pollution     monitoring technology and network     assessment     ocean    

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Occurrence and health risk assessment of trace heavy metals via groundwater in Shizhuyuan Polymetallic

Bingbing XU,Qiujin XU,Cunzhen LIANG,Li LI,Lijia JIANG

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 3,   Pages 482-493 doi: 10.1007/s11783-014-0675-8

Abstract: In particular, this study focused on the exposure and the health risk assessment of trace heavy metal

Keywords： groundwater     heavy metal     health risk assessment     mine area    

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Research progress in removal of trace carbon dioxide from closed spaces

ZHANG Yatao, FAN Lihai, ZHANG Lin, CHEN Huanlin

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 3,   Pages 310-316 doi: 10.1007/s11705-007-0057-x

Abstract: In this paper, the removal of trace carbon dioxide from closed spaces through membrane process and biotransformation

Keywords： removal efficiency     consumption     removal     CO removal     membrane microalgae    

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Degradation of trace nitrobenzene in water by microwave-enhanced H

Honghu ZENG, Lanjing LU, Meina LIANG, Jie LIU, Yanghong LI

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 4,   Pages 477-483 doi: 10.1007/s11783-012-0395-x

Abstract: To evaluate possible use of microwave-enhanced H O -based (MW/H O ) process to degrade trace nitrobenzene

Keywords： microwave     hydrogen peroxide     nitrobenzene     humic acid    

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Preliminary study of trace element emissions and control during coal combustion

ZHANG Junying, ZHAO Yongchun, DING Feng, ZENG Hancai, ZHENG Chuguang

Frontiers in Energy 2007, Volume 1, Issue 3,   Pages 273-279 doi: 10.1007/s11708-007-0038-2

Abstract: Hazardous trace element emissions have caused serious harm to human health in China.Several typical high-toxic trace element coals were collected from different districts and were usedto investigate the emission characteristics of toxic trace elements (As, Se, Cr, Hg) and to explore preliminaryThe chemical composition and trace element contents of ash and particulate matter (PM) were determined

Keywords： Pingdingshan     occurrence     plasma-atomic emission     chemical composition     Several typical    

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Feasibility study on simultaneous removal of sulfur and trace selenium in the MTD-FGD reactor

LI Yuzhong, TONG Huiling, ZHUO Yuqun, LI Yan, CHEN Changhe, XU Xuchang

Frontiers in Energy 2007, Volume 1, Issue 3,   Pages 259-263 doi: 10.1007/s11708-007-0036-4

Abstract: This study deals with the simultaneous removal of sulfur dioxide (SO) and trace selenium dioxide (SeOTherefore, it is feasible that sulfur and trace selenium can be simultaneously removed by Ca-based sorbent

Keywords： Ca-based sorbent     product     feasibility     thermogravimetric analyzer     simultaneous removal    

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Title Author Date Type Operation

Environmental process of the deep-water lakes and approach to the protection of water resources on the Yunnan-Guizhou Plateau

Wan Guojiang

Journal Article

Cesium removal from radioactive wastewater by adsorption and membrane technology

Journal Article

Assessment of mobile and potential mobile trace elements extractability in calcareous soils using different

Mohsen Jalali, Ziba Hurseresht

Journal Article

Preconcentration of trace elements by adsorption onto a niobium wire for electrothermal atomization atomic

Satoshi KANECO, Hiroaki KITANAGA, Hideyuki KATSUMATA, Tohru SUZUKI

Journal Article

Assessing human bioaccessibility of trace contaminants in size-fractionated red mud, derived precipitates

Chunfeng Wang, Yanchen Zhu, Dan Yao, Guanfei Chen, Lianjun Wang

Journal Article

The energy-free purification of trace thallium(I)-contaminated potable water using a high-selective filter

Journal Article

Biodegradation of trace pharmaceutical substances in wastewater by a membrane bioreactor

Longli BO, Taro URASE, Xiaochang WANG

Journal Article

PSS sorbents for removing trace hydrogen sulfide in methane

Limei ZHONG, Li ZHOU

Journal Article

Error compensation for tool-tip trace during cutting of laminated paper for rapid prototyping

Yucheng DING, Changhe LI, Dichen LI, Guoxin YU

Journal Article

Review on the marine radioactive-pollution monitoring and assessment technology

Chen Liqi,He Jianhua1,Lin Wuhui,YuWen, MenWu

Journal Article

Occurrence and health risk assessment of trace heavy metals via groundwater in Shizhuyuan Polymetallic

Bingbing XU,Qiujin XU,Cunzhen LIANG,Li LI,Lijia JIANG

Journal Article

Research progress in removal of trace carbon dioxide from closed spaces

ZHANG Yatao, FAN Lihai, ZHANG Lin, CHEN Huanlin

Journal Article

Degradation of trace nitrobenzene in water by microwave-enhanced H

Honghu ZENG, Lanjing LU, Meina LIANG, Jie LIU, Yanghong LI

Journal Article

Preliminary study of trace element emissions and control during coal combustion

ZHANG Junying, ZHAO Yongchun, DING Feng, ZENG Hancai, ZHENG Chuguang

Journal Article

Feasibility study on simultaneous removal of sulfur and trace selenium in the MTD-FGD reactor

LI Yuzhong, TONG Huiling, ZHUO Yuqun, LI Yan, CHEN Changhe, XU Xuchang

Journal Article