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Artificial aggregate made from waste stone sludge and waste silt 总被引:1,自引:0,他引:1
Fang-Chih Chang Ming-Yu Lee Shang-Lien Lo Jyh-Dong Lin 《Journal of environmental management》2010,91(11):2289-2294
In this research, waste stone sludge obtained from slab stone processing and waste silt from aggregate washing plants were recycled to manufacture artificial aggregate. Fine-powdered stone sludge was mixed with waste silt of larger particle size; vibratory compaction was applied for good water permeability, resulting in a smaller amount of solidifying agent being used. For the densified packing used in this study, the mix proportion of waste stone sludge to waste silt was 35:50, which produced artificial aggregate of more compact structure with water absorption rate below 0.1%. In addition, applying vibratory compaction of 33.3 Hz to the artificial aggregate and curing for 28 days doubled the compressive strength to above 29.4 MPa. Hence, recycling of waste stone sludge and waste silt for the production of artificial aggregate not only offers a feasible substitute for sand and stone, but also an ecological alternative to waste management of sludge and silt. 相似文献
215.
Laboratory tests using 240 mm diameter columns were conducted to study fines migration in conditions that simulate daily soil covers in Hong Kong municipal solid waste landfills. Five factors suspected to affect fines migration were examined: moisture content at soil compaction, overburden pressure, pumping rate, cover thickness, and soil-waste interface condition. The results show that moisture content at compaction, cover thickness, and soil-waste interface are the most influential parameters on fines migration in completely decomposed granite daily covers. The measured equivalent sizes of migratory fines from the soil covers were in the range of 4–140 μm. The majority of migratory fines migrated during first permeations, representing 64–86% of the total by mass. Larger particles tended to migrate from the soil mass during the saturation process. In a typical run, about 0.0018% of the total cover soil (by dry weight) was washed out during a typical 1 h rainfall event. The results of the laboratory studies point to important engineering implications on the operation of local MSW landfills regarding the use of sandy daily covers. 相似文献
216.
A laboratory-scale multi-layer system was developed for the adsorption of PCDD/Fs from gas streams at various operating conditions, including gas flow rate, operating temperature and water vapor content. Excellent PCDD/F removal efficiency (>99.99%) was achieved with the multi-layer design with bead-shaped activated carbons (BACs). The PCDD/F removal efficiency achieved with the first layer adsorption bed decreased as the gas flow rate was increased due to the decrease of the gas retention time. The PCDD/F concentrations measured at the outlet of the third layer adsorption bed were all lower than 0.1 ng I-TEQ Nm−3. The PCDD/Fs desorbed from BAC were mainly lowly chlorinated congeners and the PCDD/F outlet concentrations increased as the operating temperature was increased. In addition, the results of pilot-scale experiment (real flue gases of an iron ore sintering plant) indicated that as the gas flow rate was controlled at 15 slpm, the removal efficiencies of PCDD/F congeners achieved with the multi-layer reactor with BAC were better than that in higher gas flow rate condition (20 slpm). Overall, the lab-scale and pilot-scale experiments indicated that PCDD/F removal achieved by multi-layer reactor with BAC strongly depended on the flow rate of the gas stream to be treated. 相似文献
217.
Degradation of chelating agents in aqueous solution using advanced oxidation process (AOP) 总被引:5,自引:0,他引:5
This article presents an overview with critical analysis of technical applicability of advanced oxidation process (AOP) in removing chelating agents from aqueous solution. Apart from the effect of metals for chelating agents as a major influencing factor, selected information such as pH, oxidant’s dose, concentrations of pollutants and treatment performance is presented. The performance of individual AOP is compared. It is evident from our literature survey that photocatalysis with UV irradiation alone or coupled with TiO2, ozonation and Fenton’s oxidation are frequently applied to mineralize target pollutants. Overall, the selection of the most suitable AOP depends on the characteristics of effluents, technical applicability, discharge standard, regulatory requirements and environmental impacts. 相似文献
218.
On the basis of the European Water Framework Directive (2000/60), the water resources of the member states of the European
Community should reach good quality standards by 2015. Although such regulations illustrate the basic points for a comprehensive
and effective policy of water monitoring and management, no practical tools are provided to face and solve the issues concerning
freshwater ecosystems such as rivers. The Italian government has developed a set of regulations as adoption of the European
Directive but failed to indicate feasible procedures for river monitoring and management. On a local scale, Sicilian authorities
have implemented monitoring networks of watersheds, aiming at describing the general conditions of rivers. However, such monitoring
programs have provided a relatively fragmentary picture of the ecological conditions of the rivers. In this study, the integrated
use of environmental quality indices is proposed as a methodology able to provide a practical approach to river monitoring
and management. As a case study, the Imera Meridionale River, Sicily’s largest river, was chosen. The water quality index
developed by the U.S. National Sanitation Foundation and the floristic quality index based on the Wilhelm method were applied.
The former enabled us to describe the water quality according to a spatial–temporal gradient, whereas the latter focused on
the ecological quality of riparian vegetation. This study proposes a holistic view of river ecosystems by considering biotic
and abiotic factors in agreement with the current European regulations. How the combined use of such indices can guide sustainable
management efforts is also discussed. 相似文献
219.
Hung-Lung Chiang Cho-Ching Lo Sen-Yi Ma 《Environmental science and pollution research international》2010,17(3):624-633
Introduction
The pyrolytic method was employed to recycle metals and brominated compounds blended into printed circuit boards (PCBs). 相似文献220.
The solubilization of blood meal by means of the microwave-hydrogen peroxide enhanced advanced-oxidation process (MW/H(2)O(2)-AOP) was studied. It was found that over the treatment temperature range of 60 to 120 degrees C, solids particle reduction, ammonia and orthophosphate production could be achieved by this process. Large protein molecules were broken down into intermediate compounds with low molecule weights, ammonia and nitrate. Intermediate compounds, such as peptides and amino acids, can also be easily converted to nitrogenous nutrients for plant growth by bacteria. Soluble nitrogen content increased with an increase in microwave heating temperature when acid was added; significant amounts of ammonia were obtained at higher temperatures. Nitrate decreased in concentration with an increase of treatment temperature. Orthophosphate concentrations increased after the advanced-oxidation process (AOP) treatments, with and without acid addition; but were more pronounced with acid addition. Maximum solubility of chemical oxygen demand (COD) occurred at 80 degrees C. Without the addition of acid, soluble COD decreased due to protein denaturation and coagulation out of the solution. 相似文献