Xem 1-20 trên 95 kết quả Soil pollution
  • Why do some contaminants remain in soils indefinitely? How much of a threat do they pose to human health or the environment? The need for effective and economic site decontamination arises daily. Geoenvironmental Engineering: Contaminated Soils, Pollutant Fate, and Mitigation discusses why soils remain contaminated, focusing on the development of the factors, properties, characteristics, and parameters of soils and individual contaminants.

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  • Assessment of source of air, water, and land pollution - Part II : Approaches for consideration in formulating evironmantal control strategies.The environment is a combination of natural factors and social surrounds the outside of a certain system. They affect this system and identify trends and status of its existence. Environment can be seen as a set, in which the system is considered as a subset. Environment of a system is considered to be interactive with that system

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  • The treatment of contaminated land to eliminate or reduce the presence of pollutants in the contaminated site has received (and will continue to receive) considerable attention from the practicing profession. Extensive research and development are still underway in respect to the delivery of more effective (and economic) means for site decontamination.

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  • A large amount of information has accumulated on humic acids and related substances, which warrants the creation of an independent science of humic compounds. Two different concepts have emerged from the maze of data, one claiming humic compounds to be operational or fake compounds, produced by the analytical extraction procedures, and the other considering them to be natural compounds occurring in soils, rivers, lakes, oceans and their sediments.

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  • Despite the tremendous progress that has been achieved in water pollution, almost 40% of the U.S. waters that have been assessed by states do not meet water quality goals. About 20,000 water bodies are impacted by siltation, nutrients, bacteria, oxygen depletion substances, metals, habitat alterations, pesticides, and toxic organic chemicals. With pollution from point sources being dramatically reduced, nonpoint source pollution is the major cause of most water that does not meet water quality goals.

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  • This volume aims at providing a coherent presentation of recent developments and understanding of heavy metal reactivity in soils. Such an understanding is necessary in addressing heavy metals concerns in the environment. The implicit framework of multiple reactivity acknowledges the widely known role played by the various colloidal surface functional groups in concomitant reactions. This overarching frame of reference allows unification between molecular structure-reactivity relationships at one scale and transport processes at the other....

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  • Soil erosion is a hazard traditionally associated with agriculture in tropical and semi-arid areas and is important for its long-term effects on soil productivity and sustainable agriculture. It is, however, a problem of wider significance occurring additionally on land devoted to forestry, transport and recreation. Erosion also leads to environmental damage through sedimentation, pollution and increased flooding. The costs associated with the movement and deposition of sediment in the landscape frequently outweigh those arising from the long-term loss of soil in eroding fields.

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  • This paper presents the results of soil characteristics study and orientation for rational and sustainable use of major soil types in Thai Thuy District, Thai Binh Province, where is facing many environmental problems. The interactive process between river, sea and human activities over time has resulted in the characteristics of 10 soil types, which are grouped in 4 main classes (acid sulfate soil, saline soil, alluvial soil and sandy soil). They have been used for agricultural production (mainly for rice and other crops growing).

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  • Pollution prevention practices include low impact development techniques, installation of green roofs and improved chemical handling (e.g. management of motor fuels & oil, fertilizers and pesticides). Runoff mitigation systems include basin infiltration basins, bio retention systems, constructed wetlands, retention basins and similar devices. Thermal pollution from runoff can be controlled by storm water management facilities that absorb the runoff or direct it into groundwater, such as bio retention systems and infiltration basins.

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  • We are experiencing rapid growth rate of urbanization, motorization and industrialization. Our overwhelming dependence on fossil fuel to drive our daily life and economic activities has led to releasing of various green house gases and air pollutants into the atmosphere resulting in degrading of the quality of air in the urban areas and global problem of climate change. Degrading of the quality of air in the urban areas has put at risk the lives of millions of people under direct threat due to health impacts associated with air pollution.

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  • The quality of air in Kathmandu valley is much lower than the national and international standards and the occurrence of high level of PM 10 in the atmosphere has become a major health concern. Vehicular emission followed by road re-suspension dust, smoke and dust out of the brick kilns are the main culprits. It is not that there is nothing done to address this grave problem. Various GOs and I/NGOs and private sector alike have shown their concern to address the problem of air pollution in Nepal but they are strikingly insufficient as compared against the magnitude and gravity of...

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  • Point source wastewater treatment-Farms with large livestock and poultry operations, such as factory farms, are called concentrated animal feeding operations or confined animal feeding operations in the U.S. and are being subject to increasing government regulation. Animal slurries are usually treated by containment in lagoons before disposal by spray or trickle application to grassland. Constructed wetlands are sometimes used to facilitate treatment of animal wastes, as are anaerobic lagoons.

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  • The Modular Wetlands device to be tested is located in a non typical situation. Unlike a storm event that typically contains higher concentration during the first 2 hours our site has a fairly consistent flow of wash water that is estimated to be consistent through out the day. For this reason, composite samples were taken over a two hour period. The intent of the sampling was to establish a composite pollutant sample. This was done by dividing all of the containers and bottles to be filled for testing into ten equal parts. The grab sample was taken...

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Genomics technology for assessing soil pollution...

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  • First, recall that the SNIFF emissions inventory discussed above clearly indicates that industry is not the leading source of particulate emissions in Ciudad Juárez. Rather, the leading sources are vehicles, unpaved roads, and soil erosion (Table 1). Moreover, even leaving aside vehicles and soils, the single most important industrial subsector in terms of air pollution is brick kilns, not maquiladoras (Table 2). In fact, brick kilns emit more particulate matter than all other industrial plants combined.

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  • Located at the interface of the geosphere, biosphere, hydrosphere and atmosphere, land is important for an understanding of both the natural environment process and those affected by human activities.

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  • The idea for this book arose during the planning phases of an International Conference in Edmonton, Canada in July 2004 entitled “The Science of Changing Climates — Impacts on Agriculture, Forestry and Wetlands.” The conference was organized jointly by the Canadian Societies of Animal Science, Plant Science and Soil Science with support from Natural Resources Canada/Canadian Forest Service because they saw climate change as one of the most serious environmental problems facing the world....

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  • Enzymes that function within plants, animals, and microorganisms are fundamental to life, and their contributions to metabolic pathways and processes have been studied extensively. For over 100 years there has been interest in what today is called ecological or environmental enzymology. This aspect of enzymology originates from the work of Woods, who, in 1899, wrote about the survival and function in soil of plant peroxidases following their release from decaying plant roots.

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  • Many have endeavored to make our outdoor environment cleaner and safer. The learning process that occurred showed us the limitations of our planet and also the sustainability of our ecosystem if given a chance. As a community, we learned about the water, the soil, and the air. We learned about the underground river that flowed to the surface lake. We learned about air currents that transported airstreams around our globe. We discovered the reality of plate tectonics and the ever-changing hydrogeological system.

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  • Bản chất của đất 2,1 LIỆU ĐẤT TRONG MÔI TRƯỜNG ĐẤT vật liệu đất quan tâm (và mối quan tâm) trong nghiên cứu của số phận gây ô nhiễm ô nhiễm môi trường đất là chất nền đất và trầm tích hình thành ở phía dưới của nước tiếp nhận (hồ, sông, vv ). Chúng tôi đã xác định chất gây ô nhiễm (Phần 1,5) là những chất gây ô nhiễm được đánh giá là mối đe dọa đối với môi trường và y tế công cộng, và sẽ tiếp tục sử dụng thuật ngữ trong ý nghĩa này.

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