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331.
初步比较气升式内循环蜂窝陶瓷反应器(IAL-CHS)和内循环三相流化床反应器(ITFB)对微污染水源水进行生物预处理的效果。IAL-CHS反应器比ITFB反应器挂膜启动速度快,但是在挂膜期承受冲击负荷能力较ITFB反应器差。在进水相同条件下,两者所能达到的最小水力停留时间、最大体积负荷和容积负荷相差不大,但是ITFB反应器的曝气强度却为IAL-CHS反应器的3.33倍,并且比IAL-CHS反应器出水SS高,浊度去除率低,单位载体的生物量及活性生物量小。 相似文献
332.
Landscape spatial patterns have increasingly been considered to be essential for environmental planning and resources management.
In this study, we proposed a hierarchical approach for landscape classification and evaluation by characterizing landscape
spatial patterns across different hierarchical levels. The case study site is the Red Hills region of northern Florida and
southwestern Georgia, well known for its biodiversity, historic resources, and scenic beauty. We used one Landsat Enhanced
Thematic Mapper image to extract land-use/-cover information. Then, we employed principal-component analysis to help identify
key class-level landscape metrics for forests at different hierarchical levels, namely, open pine, upland pine, and forest
as a whole. We found that the key class-level landscape metrics varied across different hierarchical levels. Compared with
forest as a whole, open pine forest is much more fragmented. The landscape metric, such as CONTIG_MN, which measures whether
pine patches are contiguous or not, is more important to characterize the spatial pattern of pine forest than to forest as
a whole. This suggests that different metric sets should be used to characterize landscape patterns at different hierarchical
levels. We further used these key metrics, along with the total class area, to classify and evaluate subwatersheds through
cluster analysis. This study demonstrates a promising approach that can be used to integrate spatial patterns and processes
for hierarchical forest landscape planning and management. 相似文献
333.
An assessment of landscape characteristics affecting estuarine nitrogen loading in an urban watershed 总被引:2,自引:0,他引:2
Yang X 《Journal of environmental management》2012,94(1):50-60
Exploring the quantitative association between landscape characteristics and the ecological conditions of receiving waters has recently become an emerging area for eco-environmental research. While the landscape-water relationship research has largely targeted on inland aquatic systems, there has been an increasing need to develop methods and techniques that can better work with coastal and estuarine ecosystems. In this paper, we present a geospatial approach to examine the quantitative relationship between landscape characteristics and estuarine nitrogen loading in an urban watershed. The case study site is in the Pensacola estuarine drainage area, home of the city of Pensacola, Florida, USA, where vigorous urban sprawling has prompted growing concerns on the estuarine ecological health. Central to this research is a remote sensor image that has been used to extract land use/cover information and derive landscape metrics. Several significant landscape metrics are selected and spatially linked with the nitrogen loading data for the Pensacola bay area. Landscape metrics and nitrogen loading are summarized by equal overland flow-length rings, and their association is examined by using multivariate statistical analysis. And a stepwise model-building protocol is used for regression designs to help identify significant variables that can explain much of the variance in the nitrogen loading dataset. It is found that using landscape composition or spatial configuration alone can explain most of the nitrogen loading variability. Of all the regression models using metrics derived from a single land use/cover class as the independent variables, the one from the low density urban gives the highest adjusted R-square score, suggesting the impact of the watershed-wide urban sprawl upon this sensitive estuarine ecosystem. Measures towards the reduction of non-point source pollution from urban development are necessary in the area to protect the Pensacola bay ecosystem and its ecosystem services. 相似文献
334.
Li P Wang X Allinson G Li X Stagnitti F Murray F Xiong X 《Environmental science and pollution research international》2011,18(7):1090-1097
Background
Open-top chambers were used to study the impact of simultaneous exposure to atmospheric SO2 pollution and heavy metal contamination in soils on the metal contents and productivity of soybean plant. 相似文献335.
采用共沉淀法合成出一系列镁铝摩尔比不同的碳酸根型水滑石(LDHs),经500℃高温煅烧制备出镁铝复合氧化物CLDH,并用X-射线、红外光谱对它们进行表征。考查了吸附剂投加量、反应时间、初始pH值等因素对LDHs和CLDH处理阴离子染料活性艳红X-3B模拟废水效果的影响,并对吸附机理进行探讨。实验结果表明:以镁铝摩尔比为3:1时制得的水滑石对活性艳红X-3B溶液的脱色效果最好。水滑石LDHs及其焙烧产物CLDH对活性艳红X-3B染料均具有较好的吸附性能,最佳反应时间分别为60min和30min;在较宽的pH范围内二者的脱色性能稳定,且CLDH对该染料的吸附效果要优于LDHs。LDHs及CLDH对活性艳红X-3B的吸附结果符合Langmuir吸附等温式,25℃下饱和吸附量分别为263.77mg/g和875.23mg/g。LDHs及CLDH的吸附机理分别为离子交换和层状结构重建。饱和吸附后的CLDH用高温热解法再生,吸附性能良好,随再生次数增多,脱色率下降。 相似文献
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340.
Yanxi Chen Zhiguang Niu Hongwei Zhang 《Environmental science and pollution research international》2013,20(6):3877-3889
Landscape lakes in the city suffer high eutrophication risk because of their special characters and functions in the water circulation system. Using a landscape lake HMLA located in Tianjin City, North China, with a mixture of point source (PS) pollution and non-point source (NPS) pollution, we explored the methodology of Fluent and AQUATOX to simulate and predict the state of HMLA, and trophic index was used to assess the eutrophication state. Then, we use water compensation optimization and three scenarios to determine the optimal management methodology. Three scenarios include ecological restoration scenario, best management practices (BMPs) scenario, and a scenario combining both. Our results suggest that the maintenance of a healthy ecosystem with ecoremediation is necessary and the BMPs have a far-reaching effect on water reusing and NPS pollution control. This study has implications for eutrophication control and management under development for urbanization in China. 相似文献