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41.
Leachate Characterization and Assessment of Groundwater Pollution Near Municipal Solid Waste Landfill Site 总被引:6,自引:0,他引:6
Leachate and groundwater samples were collected from Gazipur landfill-site and its adjacent area to study the possible impact
of leachate percolation on groundwater quality. Concentration of various physico-chemical parameters including heavy metal
(Cd, Cr, Cu, Fe, Ni, Pb and Zn) and microbiological parameters (total coliform (TC) and faecal coliform (FC)) were determined
in groundwater and leachate samples. The moderately high concentrations of Cl−, NO−
3, SO2−
4, NH+
4, Phenol, Fe, Zn and COD in groundwater, likely indicate that groundwater quality is being significantly affected by leachate
percolation. Further they proved to be as tracers for groundwater contamination. The effect of depth and distance of the well
from the pollution source was also investigated. The presence of TC and FC in groundwater warns for the groundwater quality
and thus renders the associated aquifer unreliable for domestic water supply and other uses. Although some remedial measures
are suggested to reduce further groundwater contamination via leachate percolation, the present study demand for the proper
management of waste in Delhi. 相似文献
42.
Ravindra K Wauters E Tyagi SK Mor S Van Grieken R 《Environmental monitoring and assessment》2006,115(1-3):405-417
Public transport in Delhi was amended by the Supreme Court of India to use Compressed Natural Gas (CNG) instead of diesel or petrol. After the implementation of CNG since April 2001, Delhi has the highest fraction of CNG-run public vehicles in the world and most of them were introduced within 20 months. In the present study, the concentrations of various criteria air pollutants (SPM, PM10, CO, SO2 and NOx) and organic pollutants such as benzene, toluene, xylene (BTX) and polycyclic aromatic hydrocarbons (PAHs) were assessed before and after the implementation of CNG. A decreasing trend was found for PAHs, SO2 and CO concentrations, while the NOx level was increased in comparison to those before the implementation of CNG. Further, SPM, PM10, and BTX concentrations showed no significant change after the implementation of CNG. However, the BTX concentration demonstrated a clear relation with the benzene content of gasoline. In addition to the impact of the introduction of CNG the daily variation in PAHs levels was also studied and the PAHs concentrations were observed to be relatively high between 10 pm to 6 am, which gives a proof of a relation with the limited day entry and movement of heavy vehicles in Delhi. 相似文献
43.
44.
Studies were conducted on the spatial distribution of different stages of the mango stone weevil, Sternochetus mangiferae (Fabr.) at Hessaraghatta farm of the Indian Institute of Horticultural Research, Bangalore, during 1983. The values of various parameters of distribution showed that the eggs are distributed as a negative binomial (contagious) distribution, whereas larvae and adults follow a positive binomial (random) distribution. It is suggested that the change in distribution may be due to the lower population densities in larval and adult stages. 相似文献
45.
46.
Francis Davison Yamba Hartley Walimwipi Suman Jain Peter Zhou Boaventura Cuamba Cornelius Mzezewa 《Mitigation and Adaptation Strategies for Global Change》2011,16(6):617-628
The study has analysed the effects of various factors on hydroelectric power generation potential to include climate change/variability,
water demand, and installation of proposed hydroelectric power schemes in the Zambezi River Basin. An assessment of historical
(1970–2000) power potential in relation to climate change/variability at existing hydro electric power schemes(Cahora Bassa,
Kariba, Kafue Gorge and Itezhi-Tezhi) in the Zambezi River Basin was conducted. The correlation of hydroelectric power potential
with climate change/variability aimed at observing the link and extent of influence of the latter on the former was investigated.
In order to predict the future outlook of hydro electric power potential, General Circulation Models (GCM) were used to generate
projected precipitation. The monthly simulated precipitation was extracted from the GCM for every sub basin and used to compute
future precipitation. Further, future water demand in the sub basins of the Zambezi River Basin were estimated based on the
respective population growth rate in each sub basin. Subsequently, water balance model, with projected precipitation and water
demand input was used to determine projected run-offs of sub basins of the Zambezi River Basin. .Based on the projected run-offs
of sub basins, reservoir storage capacities at existing hydro electric power schemes were estimated. The baseline assessment
revealed a strong relationship between hydroelectric power potential and climate change/variability. The study also revealed
that the main climate and other risks associated with current and future hydro electric power generation include projected
dry years, floods and increasing water demand. The results indicate that the hydroelectric power potential has a tendency
towards gradual reduction in its potential in all existing and proposed hydroelectric power schemes owing to climate change
and increasing water demand. 相似文献
47.
Environmental Chemistry Letters - Fresh food products such as fruits and vegetables are usually degrading fast after harvest, notably due to the production of ethylene, an aging hormone, by the... 相似文献
48.
Eating safe and healthy food is a rising consumer awareness. Oxygen-sensitive foods can now be better protected using oxygen scavenging films, an emerging technology that extends the shelf life and maintains the quality and freshness of food products. The use of oxygen-absorbing materials in packaging is a current trend in active packaging, especially in food packaging. Some oxygen scavenging films have shown excellent oxygen absorbance and become commercial successes. Here, we review oxygen scavenging films used in food packaging, such as novel natural oxygen scavenging agents and active barrier films. 相似文献
49.
Suman Gupta Vijay T. Gajbhiye Rakesh K. Sharma Ram K. Gupta 《Environmental monitoring and assessment》2011,177(1-4):337-342
In this study, changes in heavy metal accumulation in U. rigida J. Agardh taxon and seawater have been investigated with respect to different stations and seasons. For this purpose, the severity of heavy metal pollution in the Dardanelles has been presented through the determination of Cu, Pb, Zn, and Cd concentrations in U. rigida macroalgae and seawater taken seasonally from the stations located on six different regions on the strait. While the metal concentrations in alga specimens were found to be high in spring and winter in all stations; the metal concentrations in the seawater, particularly the Pb concentration, were found to be high in all seasons. 相似文献
50.
Lin DS Greenwood PF George S Somerfield PJ Tibbett M 《Environmental science and pollution research international》2011,18(7):1070-1078