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排序方式: 共有146条查询结果,搜索用时 31 毫秒
31.
The adsorption behavior of natural Jordanian zeolites with respect to Cd(2 + ), Cu(2 + ), Pb(2 + ), and Zn(2 + ) was studied in order to consider its application to purity metal finishing drinking and waste water samples under different conditions such as zeolite particle size, ionic strength and initial metal ion concentration. In the present work, a new method was developed to remove the heavy metal by using a glass column as the one that used in column chromatography and to make a comparative between the batch experiment and column experiment by using natural Jordanian zeolite as adsorbent and some heavy metals as adsorbate. The column method was used using different metal ions concentrations ranged from 5 to 20 mg/L with average particle size of zeolite ranged between 90 and 350 mum, and ionic strength ranged from 0.01 to 0.05. Atomic absorption spectrometry was used for analysis of these heavy metal ions, the results obtained in this study indicated that zeolitic tuff is an efficient ion exchanger for removing heavy metals, in particular the fine particle sizes of zeolite at pH 6, whereas, no clear effect of low ionic strength values is noticed on the removal process. Equilibrium modeling of the removal showed that the adsorption of Cd(2 + ), Cu(2 + ), Pb(2 + ), and Zn(2 + ) were fitted to Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich (DKR). The sorption energy E determined in the DKR equation (9.129, 10.000, 10.541, and 11.180 kJ/mol for Zn(2 + ), Cu(2 + ), Cd(2 + ) and Pb(2 + ) respectively) which revealed the nature of the ion-exchange mechanism. 相似文献
32.
Busman Nur Azima Maie Nagamitsu Ishak Che Fauziah Sulaiman Muhammad Firdaus Melling Lulie 《Environment, Development and Sustainability》2021,23(8):11646-11659
Environment, Development and Sustainability - Tropical peatland stores a large amount of carbon (C) and is an important C sink. In Malaysia, about 25% of the peatland area has been converted to oil... 相似文献
33.
Aydin Urucu Oya Yurtman Gündüz Zeynep Deniz Sabahattin Kok Yetimoglu Ece Aydin Adnan 《Environmental Chemistry Letters》2014,12(3):449-453
Gold is a valuable metal occurring usually at very low concentrations in complex natural samples. Gold analysis thus needs preconcentration methods. Classical liquid–liquid extraction involves hazardous organic solvents. Alternatively, cloud point extraction involves non-toxic and nonvolatile surfactants. Here, we analyzed ore samples. The complex of Au(III) with sulphapyridylazo resorcin was extracted by the cloud point method. Concentrations were measured by flame atomic absorption spectrometry. We tested the effects of pH, reagent concentration, Triton X-100 surfactant concentration, equilibration temperature and time. Results show that the best detection limit of the method was 0.48 µg L?1 for Au with a preconcentration factor of 31 times. Calibration is linear in range of 6.4–2,000 µg L?1, and relative standard deviations are lower than 5 %. Quantum chemical computations reveal the plausible structure of the gold–ligand complex. This report represents the first determination of gold using sulphapyridylazo resorcin as a ligand. 相似文献
34.
Haruno Subianto Bebeh W. Nuryadin Khairurrijal Hernawan Mahfudz Nur Dananjaya Mikrajuddin Abdullah 《Journal of Material Cycles and Waste Management》2013,15(2):210-217
A new method for decomposing organic pollutants in water is proposed. First, we used less pure titanium dioxide (TiO2) particles as a photocatalyst material to achieve an absorption band that would be as wide as the spectrum for visible sunlight. The TiO2 particles were coated onto the surface of transparent plastic fibers and used to decompose test solutions of rhodamine that were placed in open sunlight for several days. We observed an effective decomposition, and after completing the decomposition process, the fibers could be removed easily from the cleaned water leaving no TiO2 in the water. Because there was no significant change in the elemental composition of the fiber surface after being used for cleaning the water, the coated fiber can be used repeatedly. 相似文献
35.
Environmental Kuznets Curve: the case of Bangladesh for waste emission and suspended particulate matter 总被引:1,自引:0,他引:1
Md Danesh Miah Md Farhad Hossain Masum Masao Koike Shalina Akther Nur Muhammed 《The Environmentalist》2011,31(1):59-66
Economists have shown the empirical relationships between the economic growth of a nation and its environmental quality using
the hypothesis of the Environmental Kuznets Curve (EKC). To understand the EKC phenomena, a study of the literature was undertaken.
As waste, waste emission, and suspended particulate matter (SPM) are the active agents of environmental degradation, the study
focused on those agents for EKC consideration. Through understanding the different EKC trajectories, an attempt was made to
relate the economic development of Bangladesh to the EKC. It is shown that the EKCs for waste, emissions from waste, and SPM
follow the conventional EKC trajectory with a turning point related to higher income per capita in most cases. The type of
economic policy that Bangladesh should follow to deal with the pollutants and their sources is also shown. The study recommends
creating a tunnel in the EKC to lower the turning point in Bangladesh. The study is likely to help stimulate policy development
in Bangladesh. 相似文献
36.
OBJECTIVES: To develop an epidemiological profile and present the burden of urban road-traffic injuries (RTI) in children and adolescents in urban Sub-Saharan Africa. METHOD: A systematic review of published and gray literature of children and adolescents < or =19 years old involved in RTI in urban regions in Sub-Saharan Africa from January 1980-December 2003. RESULTS: The mean annual incidence for urban road-traffic injuries was 109.8 per 100,000 children, and males were twice as involved as their female counterparts. Children between 10 to 14 years constitute the most frequent group involved in road crashes (36%) while pedestrians represent an average of 68% of all childhood RTI cases. Twenty Healthy Life Years per 1,000 children and adolescents are being lost annually in the region from RTI. CONCLUSIONS: There is an urgent need to develop a regional health research agenda to generate an accurate estimate of the burden of road-traffic injuries on children. This is a new challenge for child health and there is a need to raise awareness among policy makers to promote appropriate interventions. 相似文献
37.
Stream discharge of a watershed is affected and altered by climate and landcover changes. These effects vary depending on the magnitude and interaction of the changes, and need to be understood so that local water resource availability can be evaluated and socioeconomic development within a watershed be pursued and managed in a way sustainable with the local water resources. In this study, the landcover and climate change effects on stream discharge from the Jacks Fork River basin in the Ozark Highlands of the south-central United States were examined in three phases: site observation and data collection, model calibration and simulation, and model experiment and analysis. Major results of the study show that climate fluctuations between wet and dry extremes resulted in the same change of the basin discharge regardless of the landcover condition in the basin. On the other hand, under a specified climate condition landcover change from a grassland basin to a fully forested basin only resulted in about one half of the discharge change caused by the climate variation. Furthermore, when landcover change occurred simultaneously with climate variation, the basin discharge change amplified significantly and became larger than the combined discharge changes caused by the climate and landcover change alone, a result indicating a synergistic effect of landcover and climate change on basin discharge variability.
Agricultural Research Division, University of Nebraska-Lincoln, Contribution Number 13437.Qi Hu: Corresponding author: Dr. Qi Hu, Climate and Bio-Atmospheric Sciences Group, School of Natural Resource Sciences, 237 L.W. Chase Hall, University of Nebraska-Lincoln, Lincoln, NE 68583-0728, USA. E-mail: qhu2@unl.edu. 相似文献
38.
Analysis and evaluation of nitrate levels in groundwater at Al-Hashimiya area, Jordan 总被引:3,自引:0,他引:3
Obeidat MM Massadeh AM Al-Ajlouni AM Athamneh FS 《Environmental monitoring and assessment》2007,135(1-3):475-486
Water with high nitrate concentration (NO3
−) is unfit for human consumption, especially when its concentration exceeded the threshold limit (50 mg/l) recommended by
the health authorities such as the World Health Organization (WHO). In Jordan, there is a great concern for determination
and monitoring organic and inorganic pollutants that may reach groundwater. Nitrate is highly mobile and present in domestic,
agricultural and industrial waste in Jordan, and thus this study focused initially on nitrate as both a contaminant of concern
and as an indicator of potential groundwater contamination. The present study determined the extent of nitrate contamination
in groundwater in the study area and examined the likely sources of NO3
−. A total of 248 groundwater samples were collected from 16 wells in different sites of Al-Hashimiya area, Zerqa Governorate,
Jordan, and investigated for NO3
− concentrations. Moreover, measurements of temperature, electrical conductivity and pH were carried out in the field. Analysis
was carried out according to the methods described by the American Public Health Association (APHA). Results showed that there
was a dramatic increasing in NO3
− concentrations from the year 2001 to 2006 for some selected wells in the present study. NO3
− concentration in 2006 was ranged from 10 to 330 mg/l with an average of 77 mg/l. Overall, groundwater had elevated nitrate
concentration with 92% of the samples containing more than 20 mg/l NO3
−, indicating the influence of human activities. This study has shown that there is a strong correlation between the nitrate
concentration and the wastewater effluents as a source of pollution. 相似文献
39.
Physico-chemical removal of iron from semi-aerobic landfill leachate by limestone filter 总被引:3,自引:0,他引:3
Limestone has been proven effective in removing metals from water and wastewater. A literature review indicated that limestone is capable of removing heavy metals such as Cu, Zn, Cd, Pb, Ni, Cr, Fe and Mn are through a batch process or by filtration technique. The removal capability is reported at up to 90%. However, to date most of the studies have been focused on synthetic wastewater. The present study attempts to investigate the suitability of limestone to attenuate total iron (Fe) from semi aerobic leachate at Pulau Burung Landfill Site in Penang, Malaysia. Iron was found in significant quantities at the landfill site. The study also aims to establish the Fe isotherm and breakthrough time of the proposed limestone filter for post-treatment to the migrating landfill leachate before its release to the environment. The Fe isotherms were established using a batch equilibrium test, while the breakthrough characteristics were determined using continuous flow permeating through a limestone column. The latter was used in order to simulate the continuous flow of leachate that would occur in the proposed limestone filter. The limestone media used in the experiment contain more than 90% CaCO3 with particle sizes ranging from 2 to 4 mm. Four filter columns (each 150 mm in diameter and 1000 mm depth) were installed at the landfill site. Metal loadings were kept below 0.5 kg /m3 day and the experiment was run continuously for 30 days. Initial results indicated that 90% of Fe can be removed from the leachate based on retention time of 57.8 min and surface loading of 12.2 m3/m2 day. For the batch study on the Fe isotherm, the results indicated that limestone is potentially useful as an alternative leachate treatment system at a relatively low cost. 相似文献
40.