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In recent decades, there has been considerable debate in the Metropolitan Region of Barcelona regarding the role of spatial planning in influencing general land-use trends. There is a widespread belief amongst geographers, environmentalists, planners and some politicians that spatial planning of the metropolitan region has not been particularly successful in reducing urban pressures on rural areas. The aim of this study is to explore the apparent links between urban sprawl, spatial planning and changing land use in the rural-urban fringe of Barcelona. The paper demonstrates that the main impacts of sprawl have been concentrated in agricultural areas, and that the planning system has not been capable of containing urban growth. 相似文献
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The absorption of Pb(Ⅱ) ions from aqueous solution by different alginate compounds was studied in a batch sorption system.Water soluble sodium alginate and insoluble calcium alginate beads were investigated.The lead-binding capacity of both alginate compounds was highest within the pH range 6-8.The binding capacities and rates of Pb(lI) ions by alginate compounds were evaluated.The Langmuir,Freundlich,and Bruneaur,Emmet and Teller (BET) sorption models were applied to describe the isotherms and isotherm ... 相似文献
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Comparative equilibrium studies of sorption of Pb(II) ions by sodium and
calcium alginate 总被引:1,自引:0,他引:1
The absorption of Pb(II) ions from aqueous solution by di erent alginate compounds was studied in a batch sorption system. Water
soluble sodium alginate and insoluble calcium alginate beads were investigated. The lead-binding capacity of both alginate compounds
was highest within the pH range 6–8. The binding capacities and rates of Pb(II) ions by alginate compounds were evaluated. The
Langmuir, Freundlich, and Bruneaur, Emmet and Teller (BET) sorption models were applied to describe the isotherms and isotherm
constants. Sorption isothermal data could be well interpreted by the Langmuir model. The results obtained through the study suggest that
alginate compounds are favorable sorbents. The largest amount of Pb(II) ions were bound by sodium alginate although the di erence
between two compounds was slight. Therefore, alginate substances may be considered as an alternative for sorption and removal of
Pb(II) ions from wastewaters. 相似文献
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