9th International Conference on Environmental Science and Technology: ICEST 2018 : Prague, Czech Republic, 20-22 June 2018

Totally found 27 items. Search in result

  • [会议] Geographical Distribution and Risk Assessment of Heavy Metals in Nearby River of Heap Bioleaching Plant: A Case Study At the Zijin Copper Mine, China
    摘要:The Zijin heap bioleaching plant was operated at the end of 2005. Concerns about the potential risk of environmental pollution from heap bioleaching plant arise due to the proximity to the Ting River. In this study, a physicochemical analysis, a geo-accumulation index and a high throughput sequencing technology were applied to determine heavy metals, assess the extent of heavy metal pollution, and research the effect of the heap bioleaching plant on the microbes, respectively. Results showed that the heap bioleaching plant had significant influence on the distribution of S, Pb and Cu and no significant'influence on the distribution of As, Fe and Cr. Most of the water samples reached the third class standard of the People's Republic of China for surface water and individual water samples were above the fifth class standard of the People's Republic of China for surface water (GB3838-2002) because of As. The heap bioleaching plant had some effect on the microbial biomass, diversity and the microbial composition. However, the effect on the microbial biomass and diversity were not significant.
  • [会议] Study of Molybdenum Extraction from Alkali Roasted and Water Leaching of Ferro-Molybdenum Slag by Using TOA and TBP
    摘要:Solvent extraction of molybdenum (VI) from alkali roasted and water leaching of ferro-molybdenum slag by using TOA and TBP as extractants was investigated. In this study, ferro-molybdenum slags contain about 1 wt% Mo. Before Mo solvent extraction, Mo slags were roasted by sodium hydroxide under 6:1 NaOH-slag mass ratio and 600 °C for 2hr produced 99.5% molybdenum leaching efficiency by hot water. And leave impurity metal like Fe, Mg and Ca ions in leaching Raffinate. In solvent experiments, the organic phase is composed of TOA as extractant, TBP as modifier and kerosene as diluent. The effect of solvent extraction efficiency on different parameters such as pH and TOA/TBP concentrations. The result indicated the process was an effective method to separate molybdenum ions from high-impurity ferro-molybdenum slag.
  • [会议] Iodide Removal by Use of Ag-Modified Natural Zeolites
    摘要:In the present work Ukrainian clinoptilolite was modified with Ag and applied for the removal of iodide from aqueous solutions. The effect of three different modifications was studied , one resulting in an Ag ion exchanged form, and two resulting in zeolites decorated with silver oxide and zero valent metallic nanoparticles. The results indicated the strong potential affinity of the Ag-modified zeolite materials towards iodide.
  • [会议] Iodide Removal by Use of Ag-Modified Natural Zeolites
    摘要:In the present work Ukrainian clinoptilolite was modified with Ag and applied for the removal of iodide from aqueous solutions. The effect of three different modifications was studied , one resulting in an Ag ion exchanged form, and two resulting in zeolites decorated with silver oxide and zero valent metallic nanoparticles. The results indicated the strong potential affinity of the Ag-modified zeolite materials towards iodide.
  • [会议] Fraction Transformation of Cr in Leersia hexandm Swartz Constructed Wetland
    摘要:In this paper, the fraction distribution of Cr contaminated wastewater were treated by Leersia hexandm Swartz constructed wetlands. The results showed that with the Cr-contaminated wastewater enter the wetland, the wastewaters transformed to different forms respectively, and residuals fraction mainly were existed in the matrix and in plant bodies. The residuals present in all zones turned up at first and then decreased; the reducible fraction showed a gradual decreased in the wetland; and the weak acid extractable did not change much. The fraction of Cr in L. hexandra roots increased first and then decreased in different zone, of which the most obvious changes were in weak acid extractable fraction. The fraction of weak acid extractable and residue in the stems of L. hexandra increased first and then decreased in different zone, while the ethanol fraction decreased gradually. Residue fraction and ethanol fraction in different zone gradually decreased in the L. hexandra leaves, while the weak acid extractable showed the first increase and then decrease.
  • [会议] A Preliminary Study on Application of MBR+NF/RO (Membrane Bio-Reactor + Nanofiltration/Reverse Osmosis) Combination Process for Landfill Leachate Treatment in China
    摘要:Landfill leachate involves high concentrations of organic compounds, ammonia nitrogen, heavy metals and other complex components. Hence, it is very difficult to treat using conventional biological processes alone. This research is a preliminary literature review on using MBR+NF/RO combination process to achieve purification of landfill leachate in China. MBR+NF/RO process is a combination of biological and physico-chemical technology, including MBR system, nanofiltration and reverse osmosis devices. The study found that, the benefit of a complementary combination of MBR and NF/RO process with respect to removal of ammonia nitrogen, trace organic and heavy metal ions appears quite intuitive. And this promising treatment has developed rapidly in China in last few decades. In this paper, representative project examples in China were selected for review. Mechanism and influencing factors of MBR+NF/RO process in China in the past decades will be reviewed and recommendations will be given for the future development of Chinese MBR+NF/RO process.
  • [会议] Optimization of Heavy Metal Removal by Sulfate Reducing Bacteria in a High Concentration Zn-fed Fixed Bed Bioreactor Using Plackett Burman Design Experiments
    摘要:This study evaluated the combined effect of six processing factors on Zn, Cd removal and sulfate reducing by sulfate reducing bacteria in a high concentration Zn-fed fixed bed bioreactor. Statistically valid Plackett Burman design of experiments was employed to carry out this study. The results obtained showed a high removal of Zn (99.63%), Cd (99.73%) at a maximum influent Zn concentration of 320 mg/L. Analysis of variance (ANOVA) of Zn and Cd removal revealed that the effect due to glycerol dosage and reflux ratio were highly significant (P value < 0.05). To establish the role of sulfate reducing bacteria (SRB) in the metal removal process, the characteristics of microbial community in fixed bed bioreactor was analyzed by High-throughput Sequencing during the steady operational process. The results obtained shows that the percentage of the dominant sulfate reducing bacteria in the sludge, such as Desulfovibrio, could reach 45.7%. Qualitative EDS analysis of the precipitate was performed. The results revealed that the precipitates as ZnS were confirmed by the EDS spectrum with strong peaks of zinc and sulfur.
  • [会议] A Health Impact Assessment of Traffie Restrictions during Madrid NO2 Episode
    摘要:One of the first decisions to improve the urban air quality during an air pollution episode is to apply traffic parking and access restrictions to try to decrease the amount of private vehicles driving in the city but their the effectiveness of the decisions must be evaluated before taking them. The health impact assessment tool of this work can help to the decision makers because it examines the citizen's health impacts of the applied measurements. The modelling system has been applied for a NO2 episode in Madrid city during December, 2016. The core of the system is the EMIMO-WRF/Chem air quality modeling system that simulates the air quality concentrations every grid cell of 1 km by 1 km and traffic emissions are calculated using data from a microscopic traffic model. The pollutant concentrations are inputs to the health impact module, which uses concentration-response functions. Two simulations were designed: "REAL" including traffic restrictions and "BAU" representing what would happen if no action were taken. The differences between the two simulations (BAU-REAL) give us the contribution of traffic restriction measures to improve the citizen's health. The results show that the measures taken in this specific case were not sufficiently effective compared to the effort to reduce traffic.
  • [会议] A Health Impact Assessment of Traffie Restrictions during Madrid NO2 Episode
    摘要:One of the first decisions to improve the urban air quality during an air pollution episode is to apply traffic parking and access restrictions to try to decrease the amount of private vehicles driving in the city but their the effectiveness of the decisions must be evaluated before taking them. The health impact assessment tool of this work can help to the decision makers because it examines the citizen's health impacts of the applied measurements. The modelling system has been applied for a NO2 episode in Madrid city during December, 2016. The core of the system is the EMIMO-WRF/Chem air quality modeling system that simulates the air quality concentrations every grid cell of 1 km by 1 km and traffic emissions are calculated using data from a microscopic traffic model. The pollutant concentrations are inputs to the health impact module, which uses concentration-response functions. Two simulations were designed: "REAL" including traffic restrictions and "BAU" representing what would happen if no action were taken. The differences between the two simulations (BAU-REAL) give us the contribution of traffic restriction measures to improve the citizen's health. The results show that the measures taken in this specific case were not sufficiently effective compared to the effort to reduce traffic.
  • [会议] Application and Analysis of Bayesian Method and Grey Relational Analysis in Marine Water Quality Evaluation
    摘要:There are many factors that influence the quality of marine water. In order to make the evaluation process more efficient and accurate, based on the normal distribution principle and Bias formula, this article establishes the seawater quality evaluation model by Bayesian method. Taking the evaluation of water quality of a sea area in Qingdao as an example, the measured data of eight water quality monitoring points are selected. The results of the evaluation are compared with the grey relational analysis. It shows that the results of the two methods are the same, which are the I type of water quality. So the Bayesian method based on normal distribution is applicable to the evaluation of marine water quality and the Bayesian method has the characteristic of more integrated, suitable for both large and small samples, simple calculation and easily to be used widely.
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