effects on living organisms remediation of contaminated environments and effects of heavy metals co contamination on bioremediation
Effect of metal spiking on different chemical pools and chemically extractable fractions of heavy metals
... chemical pools of heavy metals in sludge due to metal spiking and incubation, it appeared that bio-oxidation of organic carbon and consequent acidification effected release of Ni, Cu, and Cd from ... (residual fraction), of Ni and Zn from F3 fraction, of Zn from F4 and F2 fractions from sludge The released and added metals were incorporated into F5 (residual) fraction in case of Zn and Pb, into ... Spiking and incubation appeared to increase the proportions of Cd and Ni in F1 and F2 fractions at the expanse of F5 and F4 fractions which might be due to oxidative breakdown of organic components...
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Immobilization of heavy metals in sediment dredged from a seaport by iron bearing materials
... Solutions for medical wastes in Vietnam Public economics Table of Contents What is medical waste Definition of medical wastes Definition according to Wikipedia Definition ... people According to the Medical Institute of Labor and Environment Sanitation, the level of pollution of liquid wastes in hospitals was 20,000 times more than standard According to the report of the ... operation Secondly, it uses ozone diffusing devices, which save time by 10-fold in comparison with the non-ozone diffusers Moreover, Biofast can entirely deodorize and Group assignment Solutions...
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Distribution and mobility of heavy metals
... to assess the presence and extension of contamination, the concentrations of some elements measured at the sites were compared with the normal ranges and the most common values typically present ... if a contamination of cadmium, copper, lead and zinc is present Also the neighbouring zone under the vegetation has relatively high levels of Cu, Pb and Zn The concentrations at the base of the ... is below One of the pieces of material analysed (A15) has concentrations similar to ones of the relief, whereas the other (A16) has a very high copper level and low content of Fe and of La, Sc,...
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Removal of heavy metals from wastewater using agricultural and industrial wastes as adsorbents
... sorption consisted of 20 mg/l for the adsorbent dose in The adsorption of heavy metal ions by low cost adsorbents was evaluated under various conditions such as pH, heavy metal concentration, mixing ... obtained The residual concentration of heavy metals was determined by an atomic absorption spectrometer In addition to adsorption tests, a set of blank tests of low cost were conducted in order to ... department of 250 m3/day represents the main source of pollution in this company The unreacted rinse water contains high concentrations of Fe, Pb, Cd, Cu and Ni Their typical concentrations were...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 2 pps
... Treatment of Metal Contaminated Soils, EPA-542-R-97–004, USEPA, Washington, D.C., 1997 Forstner, U., Land contamination by metals: Global scope and magnitude of problem, in Metal Speciation and Contamination ... constructed based on normalized Pb and colloid concentrations (C /Co) and pore volumes A value of Co ∼5 mg/l−1 was used for Pb, and Co = 300 mg/l−1 was used for colloids Colloid concentrations in the ... + CaCO LSB - CaCO3 20 Control Colloid Concentration (mg/L) FIGURE 2.9 Breakthrough curves for pH and EC of the eluted control solutions and biosolid colloid suspensions through the soil monoliths...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 4 docx
... the logarithm of the protonating constant of equations 4.7 and 4.8, and the value 19.8 results from a model calibration using protonation constants of oxo- and hydroxo-solution complexes.19 To ... model16 and the crystallochemical model.18 The difference between the two consecutive protonation constants is so large that only one reaction (either protonation of the oxo group or protonation of ... main effects of proton adsorption-desorption on the adsorption of metals in general and heavy metals in particular have been recognized for many decades Protons can be exchanged by metal ions...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 5 pptx
... McQuarrie and Simon.43 The second consideration in choosing a method is the level of electron correlation A range of methods from no electron correlation (Hartree-Fock methods) to full configuration ... regions and coiling of the C backbone could increase the sorption of hydrophobic contaminants and increase the sequestration capacity of the NOM All these components may be available in soils and ... available conformations, but isolation of the SFA and water allows each component to move more freely The second approach was to employ periodic boundary conditions and molecular mechanics (COMPASS)...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 7 pptx
... Complexation of Co( II) by leonardite humic acid as a function of pH and NaClO4 concentration, Environ Sci Technol., 29, 951, 1995 Wilson, A.R et al., The effects of pH and surface composition on Pb ... Mn oxidation by L discophora that shows the mathematical dependence on cell concentration, Mn concentration, pH, temperature, dissolved oxygen concentration, and copper concentration (Zhang et ... range of controlled laboratory conditions and have developed a rate law for biologically mediated Mn(II) oxidation as a function of environmental conditions including temperature, pH, and the concentrations...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 8 ppsx
... U., Land contamination by metals — global scope and magnitude of problem, in Metal Speciation and Contamination of Soil, Allen, H.E., Huang, C.P., and Bailey, G.W., Eds., CRC Press, Boca Raton, ... 8.4 Conclusions and Environmental Significance 8.4.1 Fate of Zn in Soils 8.4.2 Summary of Speciation Techniques References 8.1 INTRODUCTION The contamination of surface and subsurface environments ... interactions can be considered one portion of the overall concept of metal speciation in soils However, the determination of metal speciation in complex and heterogeneous systems such as soils and...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 9 pps
... the sum of the initial concentrations of soluble and exchangeable concentrations as in equation 9.6 In the second model, the concentrations of Zn, Ni, and Sr released by dissolution of Mn oxide ... AND REACTIONS CONTROLLING THE SOLUBILITY OF MN AND TRACE METALS FOLLOWING REDUCTION The soluble concentration of Mn under reducing conditions will depend on the amount of Mn oxide dissolved and ... initial concentration of exchangeable Mn, and [Mn]s the concentration of soluble Mn from the saturated columns at the 24-h time period The concentrations of exchangeable metals were converted...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 10 ppsx
... function of DOM sources and concentrations The decomposition of DOM in soil will lead to the re-immobilization of DOMassociated metals Under aerobic incubation conditions, DOM decomposition could ... aquatic environments without better understanding of the behavior of DOM itself and interaction of DOM and metals in soils The aim of this chapter, based on a series of trials that we conducted, ... the interaction of DOM and metals under field conditions The DOM contribution to facilitate pollutants to move into aquatic environment from cropland is unclear Also, the information concerning DOM...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 11 ppt
... constituents and distributions of soil colloids to study trace metal adsorption to colloids and the effect of colloidal surface coatings on phosphate sorption.87–90 Examples of the UV-based and ... primary PSD of the natural sample and confound interpretation of trace element–colloidal interactions and sorption behavior Hence, interpretation of FFF results requires a consideration of the potential ... with colloid mass or concentration In addition, larger size particles may contribute much of the colloidal mass, but reflect a smaller portion of the surface area available for contaminant sorption.20...
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Measurement and behaviour of heavy metals in the marine environment of singapore
... international data 99 6.5 Conclusions .101 CONCLUSIONS AND RECOMMENDATIONS 102 7.1 Summary of main conclusions 102 7.1.1 Heavy metals in the seawater column and sediments ... column 128 A.3 Concentrations of particulate metals (µg/g) in the water column 131 vii A.4 Concentration of particulate metals (µg/L) in the water column .134 A.5 Concentrations of heavy ... are heavy metals? 2.1.3 Sources of heavy metals .6 2.1.4 Sources of heavy metal contamination 2.1.5 The effects of heavy metals to human beings .8 iii 2.2 Heavy metals...
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Bioaccumulation of heavy metals in nha trang bay khanh hoa province, viet nam
... 4.21 Concentrations of metals in shell and tissue of L.unguis 126 Figure 4.22 Concentrations of metals in shell and tissue of G.coavans 126 Figure 4.23 Concentrations of metals in shell and ... samples collected in rainy season amongst range of SQGs 116 Figure 4.19 Concentrations of metals in shell and tissue of L.anatine 125 Figure 4.20 Concentrations of metals in shell and tissue of ... 168 CHAPTER CONCLUSION AND SUGGESTION 173 5.1 CONCLUSIONS 173 viii 5.1.1 Heavy metal contaminations in sediment samples 173 5.1.2 Bioaccumulation of heavy metals in mollusks...
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Insights into solid phase characteristics and release of heavy metals and arsenic from industrial sludge via combined chemical, mineralogical, and microanalysis
... is the concentration of an element released at L/S=20 (mg/kg), k* is the retention factor (dimensionless), and a is an constant A higher retention factor corresponds to a stronger binding of elements ... pH of to assess the influence of acidic conditions on the release of HMs and As from sludge The test was based on an automatic multititration system (Titro-Wico Multititrator, Wittenfield and Cornelius, ... and steel processing factory in the industrial park The electroplating sludge (sample SE) has the highest concentrations of As and HMs (Co, Cu, Mo, and Zn) and extremely high concentrations of...
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Development of novel titanate nanotubesreduced graphene oxide composite for the removal of heavy metals from aqueous solution
... removal of Cd 2+ and Co2 + ions from aqueous solution, results indicate that heavy metal ions sorption on nanosheets is dependent on pH and ionic strength, and the abundant oxygen-containing functional ... discovered copper is actually toxic agents for Wilson patients and discover that the liver and brain of these patients contained metal content is very high 2.4 Effects of heavy metal to environmental ... The harmful effects of Copper on human health: 13 Copper is considered to be one of the elements necessary for human development, but the accumulation of copper with high concentrations can be...
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Tài liệu Youth Safety on a Living Internet: Report of the Online Safety and Technology Working Group pptx
... discover the natural connection between copyright and creativity Online Safety and Technology Working Group 41 Kids Help Phone Canadian nonprofit group offering phone and Nonprofit online counseling ... further confusion concerning competing regulations among states • Congress should assess the results of the data preservation procedures enacted in the PROTECT Our Children Act before considering mandatory ... Jessica Gonzales of the National Hispanic Media Coalition and Steve Sheinberg from the Anti-Defamation League about the impact of hate content on youth Ms Gonzales warned of the harmful impact of online...
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Tài liệu The future impact of the Internet on higher education: Experts expect more-efficient collaborative environments and new grading schemes; they worry about massive online courses, the shift away from on-campus life docx
... difference of opinion also emerged among the survey respondents as to what constitutes human contact and an effective educational connection Many perceived the term “distance learning” as encompassing ... unsustainable consumerism, and our economic systems will continue to be referred to as ‘the dismal science.’ Universities are critical microcosms and potential leaders for reconsideration of increased corporate ... education programs are financially supporting and often supplanting other programs.” Seth Finkelstein, professional programmer and consultant and 2001 winner of a Pioneer of the Electronic Frontier...
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Báo cáo y học: "Evolution of temporal order in living organisms" pot
... Robinson GE: Time keeping in the honey bee colony: integration of circadian rhythms and division of labor Behav Ecol Sociol 1998, 43:147-160 von Frisch K: The Dance Language and Orientation of Honeybees ... precision, phase-relationship; phase response properties and ability to entrain to a wide range of LD cycles remain intact in organisms living in constant environments In absence of cycling environments, ... a number of drawbacks such as the lack of population-level replication, true controls and of adequate control on the genetic composition of the populations, which in many ways limit the potential...
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REMEDIATION OF PETROLEUM CONTAMINATED SOILS - SECTION 1 ppt
... Groups of Microorganisms Growth of Microorganisms on Components of Gasoline Biodegradation of Gasoline Components by Mixed Normal Microflora Fuel Components/Hydrocarbons and Microorganisms Capable of ... Bioaugmentation: Supplementation of microorganisms to a contaminated site to enhance bioremediation; see Enhanced biodegradation BIOCELS: Bioreclamation with Innovative On- Site Controlled Environment Landtreatment ... groups of microorganisms are considered for their potential contribution, and the effects of both aerobic and anaerobic conditions are discussed This survey also contains an extensive overview of...
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