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11.
Baslar S Dogan Y Yenil N Karagoz S Bag H 《Journal of environmental biology / Academy of Environmental Biology, India》2005,26(4):665-668
The West Anatolian Region is one of the most important areas for industrialization, population density and traffic in Turkey. Therefore, the leaves of Populus nigra L. (Salicaceae), which are used as biomonitor to investigate the levels of the trace elements Cd, Pb, Fe, Zn and Cu, were sampled at 30 locations having different pollution levels in the region. The concentrations of elements were determined by atomic absorption spectrometry. The samples were collected at both reference and contaminated locations where iron was found as the priority element. The strong association between a gradient of contamination and concentration in all samples tested indicates that they are reflecting well the environmental changes, and that they appear as appropriate biological indicators of heavy metal contamination. 相似文献
12.
Atalay Sinan E. Bezci Betül Özdemir Burcu Göksu Yonca Alkan Ghanbari Abbas Jalali Amirjalal Nofar Mohammadreza 《Journal of Polymers and the Environment》2021,29(10):3412-3426
Journal of Polymers and the Environment - The degradation behaviors of an amorphous and a semicrystalline PLA (i.e., aPLA and cPLA) with similar molecular weights are compared at elevated... 相似文献
13.
Korucu M. Kemal Alkan Atakan Cihan Ahmet Karademir Aykan Aladag Zerrin 《Journal of Material Cycles and Waste Management》2017,19(2):946-958
Journal of Material Cycles and Waste Management - Selecting a system for treatment and disposal of municipal solid wastes (i.e., selection of the capacity, location and type of the processes and... 相似文献
14.
Adsorption kinetics of methyl violet onto perlite 总被引:11,自引:0,他引:11
This study examines adsorption kinetics and activation parameters of methyl violet on perlite. The effect of process parameters like contact time, concentration of dye, temperature and pH on the extent of methyl violet adsorption from solution has been investigated. Results of the kinetic studies show that the adsorption reaction is first order with respect to dye solution concentration with activation energy of 13.2 kJ mol(-1). This low activation energy value indicates that the adsorption reaction is diffusion controlled. The activation parameters using Arrhenius and Eyring equations have been calculated. Adsorption increases with increase of variables such as contact time, initial dye concentration, temperature and pH. 相似文献
15.
Olmez Z Gokturk A Gulcu S 《Journal of environmental biology / Academy of Environmental Biology, India》2006,27(4):667-670
Caper is an important plant because of its high adaptability to marginal agriculture fields that are not suitable for agricultural crops. Different parts of caper such as roots, fruits, flowers and buds can be used to increase the inhabitant's income. The goal of this research is to determine germination rate and percentage of caper according to different duration of cold stratification (10, 20, 30, 40, 50 and 60 days) treatments. Cold stratification procedures under greenhouse condition were applied for eliminating seed dormancy to find the most suitable germination conditions because the presence of seed dormancy causes difficulties in seedling production. The seed germination started and stopped 21 and 57 days after sowing, respectively. While the highest germination percentage (46.6%) was obtained in seeds that were cold stratified for 60 days, the lowest germination percentage (3.6 7%) was determined in control seeds. 相似文献
16.
The fast growth of the palm oil industry in Malaysia is associated with various waste products, namely the empty fruit bunches
(EFB), which have a negative impact on the environment. Therefore, these wastes were utilized as a cheap raw material for
the production of activated carbon (AC) with less energy consumption. One-step steam pyrolysis was used to produce AC from
oil palm empty fruit bunch fibers (EFBF) by varying the operating parameters of temperature, steam flow rate, and activation
time using two-level full factorial experimental design (FFD). Ten samples of AC were prepared and the optimized production
conditions were chosen based on the ability to adsorb and remove cadmium. Physical activation comprised of carbonization for
30 min using nitrogen gas (N2), followed by activation with steam at different flow rates (2.0, 3.0, and 4.0 ml/min), temperatures (600, 750, and 900°C)
and times (15, 30, and 45 min). The AC sample produced at an activation temperature of 900°C with a steam flow rate of 2.0 ml/min
and activation time of 15 min was selected as the best adsorbent with a total yield of 21.7%. It had adsorbed more than 97%
of total cadmium from aqueous solution within 2 min of the contact time. Characterization of EFBF-based AC by SEM and BET
surface area analysis had shown a good-quality adsorbent with highly active sites and well-developed pores with BET surface
area of 635.16 m2/g. Experimental results indicated that the prepared AC from EFBF provide a promising solution in water and wastewater treatment. 相似文献
17.
Activated carbons derived from oil palm empty-fruit bunches: Application to environmental problems 总被引:1,自引:1,他引:0
Md. Zahangir ALAM Suleyman A. MUYIBI Mariatul F. MANSOR Radziah WAHID 《环境科学学报(英文版)》2007,19(1):103-108
Activated carbons derived from oil palm empty fruit bunches (EFB) were investigated to find the suitability of its application for removal of phenol in aqueous solution through adsorption process, Two types of activation namely; thermal activation at 300, 500 and 800℃and physical activation at 150℃ (boiling treatment) were used for the production of the activated carbons. A control (untreated EFB) was used to compare the adsorption capacity of the activated carbons produced from these processes. The results indicated that the activated carbon derived at the temperature of 800℃ showed maximum absorption capacity in the aqueous solution of phenol. Batch adsorption studies showed an equilibrium time of 6 h for the activated carbon at 800℃. It was observed that the adsorption capacity was higher at lower values of pH (2-3) and higher value of initial concentration of phenol (200-300 mg/L). The equilibrium data fitted better with the Freundlich adsorption isotherm compared to the Langmuir. Kinetic studies of phenol adsorption onto activated carbons were also studied to evaluate the adsorption rate. The estimated cost for production of activated carbon from EFB was shown in lower price (USD 0.50/kg of activated carbon) compared the activated carbon from other sources and processes. 相似文献
18.
Bilgilioglu Suleyman Sefa Gezgin Cemil Orhan Osman Karakus Pınar 《Environmental science and pollution research international》2022,29(4):5313-5329
Environmental Science and Pollution Research - Due to rapid urbanization and the resulting rapid population increases, an important problem for cities today is the elimination of solid waste or... 相似文献
19.
Silke Gabbert Martin van Ittersum Carolien Kroeze Serge Stalpers Frank Ewert Johanna Alkan Olsson 《Regional Environmental Change》2010,10(2):131-143
Integrated Assessment (IA) models aim at providing information- and decision-support to complex problems. This paper argues
that uncertainty analysis in IA models should be user-driven in order to strengthen science–policy interaction. We suggest
an approach to uncertainty analysis that starts with investigating model users’ demands for uncertainty information. These
demands are called “uncertainty information needs”. Identifying model users’ uncertainty information needs allows focusing the analysis on those uncertainties which users
consider relevant and meaningful. As an illustrative example, we discuss the case of examining users’ uncertainty information
needs in the SEAMLESS Integrated Framework (SEAMLESS-IF), an IA model chain for assessing and comparing alternative agricultural
and environmental policy options. The most important user group of SEAMLESS-IF are policy experts at the European and national
level. Uncertainty information needs of this user group were examined in an interactive process during the development of
SEAMLESS-IF and by using a questionnaire. Results indicate that users’ information requirements differed from the uncertainty
categories considered most relevant by model developers. In particular, policy experts called for addressing a broader set
of uncertainty sources (e.g. model structure and technical model setup). The findings highlight that investigating users’
uncertainty information needs is an essential step towards creating confidence in an IA model and its outcomes. This alone,
however, may not be sufficient for effectively implementing a user-oriented uncertainty analysis in such models. As the case
study illustrates, it requires to include uncertainty analysis into user participation from the outset of the IA modelling
process. 相似文献
20.
A laboratory study using a bench scale model of two units operation involving coagulation process with Moringa oleifera seeds extract as a coagulant and filtration process using hollow fibre microfiltration membrane, was adopted to treat Air
Hitam Sanitary Landfill leachate in Puchong, Malaysia. The performance of the microfiltration membrane in pretreated sanitary
landfill leachate treatment was investigated through a continuous process. The leachate sample was passed through conventional
coagulation process before being filtered through a hollow fibre microfiltration membrane of 0.1 μm surface pores. The hollow
fibre microfiltration membrane decreased the turbidity, colour, total suspended solids, total dissolved solids and volatile
suspended solids in the leachate by 98.30, 90.30, 99.63, 14.71 and 20%, respectively. The results showed that microfiltration
is capable of removing high percentage of solids from leachate and might be considered as a polishing stage after on-site
biological treatment for sanitary landfill leachate. 相似文献