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131.
Byeong-Kyu Lee B. Raj Mohan Seung-Hyeok Byeon Kyung-Soo Lim Eun-Pyo Hong 《Journal of the Air & Waste Management Association (1995)》2013,63(5):499-506
A turbulent wet scrubber was designed and developed to scrub particulate matter (PM) at micrometer and submicrometer levels from the effluent gas stream of an industrial coal furnace. Experiments were conducted to estimate the particle removal efficiency of the turbulent scrubber with different gas flow rates and liquid heads above the nozzle. Particles larger than 1 µm were removed very efficiently, at nearly 100%, depending upon the flow rate, the concentration of the dust-laden air stream, and the water level in the reservoir. Particles smaller than 1 µm were also removed to a greater extent at higher gas flow rates and for greater liquid heads. Pressure-drop studies were also carried out to estimate the energy consumed by the scrubber for the entire range of particle sizes distributed in the carrier gas. A maximum pressure drop of 217 mm H2O was observed for a liquid head of 36 cm and a gas flow rate of 7 m3/min. The number of transfer units (NTU) analysis for the efficiencies achieved by the turbulent scrubber over the range of particles also reveals that the contacting power achieved by the scrubber is better except for smaller particles. The turbulent scrubber is more competent for scrubbing particulate matter, in particular PM2.5, than other higher energy or conventional scrubbers, and is comparable to other wet scrubbers of its kind for the amount of energy spent.
Implications: The evaluation of the turbulent scrubber is done to add a novel scrubber in the list of wet scrubbers for industrial applications, yet simple in design, easy to operate, with better compactness, and with high efficiencies at lower energy consumption. Hence the turbulent scrubber can be used to combat particulate from industrial gaseous effluents and also has a scope to absorb gaseous pollutants if the gases are soluble in the medium used for particles capture. 相似文献
132.
Studies on the moisture sorption characteristics of chitosan/polyethylene oxide (PEO) blended films have been carried out
at 27 °C for water activity (a
w) from 0.1 to 0.9. The sorption data at different a
w were used to fit 12 different sorption isotherm models proposed in the literature. The model constants were determined by
linear fitting of the sorption equations. The ranges of applicability of water activity for the isotherms reported in the
article lie between 0.11 to 0.44 (monomolecular layer) for the BET model and between 0.11 to 0.86 (monolayer & multilayer’s)
for Smith, Caurie, Bradley and Oswin. The water activity for Halsey and Chung & Pfost models lies between 0.44 to 0.86 (multilayer)
and 0.33 to 0.86 for Henderson and Freundlich models and 0.11 to 0.65 for Kuhn, Linear and Iglesias & Chirife models. The
high coefficient of determination R
2 (ranges from 0.82 to 1) confirms the applicability of the equations employed. The study on the application of such water
activity data of chitosan/PEO blended films on different model equations will be helpful in prediction of durability and functional
behavior of moisture sensitive biopolymeric films 相似文献
133.
Z. Mijić A. Stojić M. Perišić S. Rajšić M. Tasić M. Radenković J. Joksić 《Atmospheric environment (Oxford, England : 1994)》2010,44(30):3630-3637
The primary objective of this study is to assess anthropogenic impacts on the environment by determination of element atmospheric depositions. Bulk depositions were collected monthly, from June 2002 to December 2006, at three urban locations in Belgrade. Concentrations of Al, V, Cr, Mn, Fe, Ni, Cu, Zn, Cd and Pb were analyzed by atomic absorption spectrometry and the current deposition fluxes of atmospheric metals were established. Fourier analysis was applied in order to investigate seasonal variation of the monthly data set. Nickel, V, Fe and Al showed pronounced seasonal dependence, while seasonal variation of the other elements was not evident. The enrichment factors of Pb, Zn, Cd and Cu were obviously above those who could have been caused by natural processes, indicating a mainly anthropogenic origin. Nickel was intermediately enriched suggesting participation of both natural and anthropogenic sources. The multivariate receptor model, Unmix, was used to analyze a 5-yr element atmospheric depositions data set. Three main source profiles (mixed road dust, oil combustion and metal processing) were identified and the overall average percentage source contributions determined. 相似文献
134.
Contribution to biomonitoring of some trace metals by deciduous tree leaves in urban areas 总被引:1,自引:0,他引:1
Tomasević M Vukmirović Z Rajsić S Tasić M Stevanović B 《Environmental monitoring and assessment》2008,137(1-3):393-401
Leaves of the deciduous tree species, horse chestnut (Aesculus hippocastanum L.) and Turkish hazel (Corylus colurna L.) were used as accumulative biomonitors of trace metal pollution in the urban area of Belgrade. Using differential pulse
anodic stripping voltametry, trace metal concentrations (Pb, Cu, Zn, Cd) were determined at the single leaf level (ten leaves
per species, per month), during two successive years with markedly different atmospheric level of trace metals. Increased
trace metal concentrations in the leaves of A. hippocastanum reflected elevated atmospheric trace metal pollution, whereas C. colurna L. did not respond accordingly. The contents of Pb and Zn in soil over the same period also followed this trend. Anatomical
analyses, in young as well as in old leaves of both species, indicated typical foliar injuries of plants exposed to stressful
air conditions. Water relations that correspond to leaf age may have contributed to the considerable trace metal accumulation
in leaves. 相似文献
135.
This study examined the spatial-temporal variations and factors influencing the management of groundwater along a section of the Bagmati river corridor in the Kathmandu valley (Nepal). The results showed that rural areas were less polluted than urban areas. In urban areas, the biochemical oxygen demand (BOD), total nitrogen (TN) and total phosphorus (TP) concentrations ranged from 8.41 to 29.74 mg/L, 6.7 to 128.96 mg/L and 0.06 to 1.5 mg/L, respectively. In rural areas, the BOD, TN and TP concentrations ranged from 0.78 to 18.25 mg/L, 4.8 to 11.56 mg/L and 0.07 to 0.65 mg/L, respectively. The level of organics was higher in the pre-monsoon season, while the level of nutrients was higher in post-monsoon season. A comparison of the groundwater and surface water in the upstream rural areas revealed that the TP concentration was higher in the groundwater than in the surface water, which was attributed to the sorption of phosphorus on iron, aluminum or calcium compounds contained in the surface water, which depends upon the temperature, pH and dissolved oxygen. In urban areas, a few wells were found at groundwater levels lower than the corresponding surface water levels and were subjected to a high risk of pollution. Overall, these findings reinforce the notion that the management of surface and ground waters in an integrated approach is essential for attaining sustainable development of groundwater systems. 相似文献
136.
Effect of amendments on the extractability, retention and plant uptake of metals on a sewage-irrigated soil 总被引:1,自引:0,他引:1
Paulose B Datta SP Rattan RK Chhonkar PK 《Environmental pollution (Barking, Essex : 1987)》2007,146(1):19-24
Laboratory and greenhouse experiments were conducted to evaluate the effects of farmyard manure (FYM), CaCO(3) and single superphosphate (SSP) on retention and availability of Zn, Cu and Ni in sewage-irrigated soil. We also assessed the suitability of 0.05M EDTA for predicting the effectiveness of these amendments in reducing the phytoavailability of metals. Results indicated that EDTA could successfully predict the phytoavailability of Zn and Ni in amended soil, whereas it failed in case of Cu. By and large, application of CaCO(3), either alone or in combination with FYM had a positive effect on the retention of Zn, Cu and Ni in soil. Application of CaCO(3) alone or in combination with FYM was equally effective in reducing the Zn content in lettuce, whereas sole application of CaCO(3) significantly reduced Ni content. However, only SSP was found to be effective in reducing the Cu content in lettuce. 相似文献
137.
Arya Raj Kumar Tiwari Anurag Kumar 《Environmental science and pollution research international》2023,30(4):8391-8392
Environmental Science and Pollution Research - 相似文献
138.
139.
Sharma Diana A. Keesari Tirumalesh Rishi Madhuri S. Thakur Nandini Pant Diksha Sangwan Priyanka Sahoo Bijay K. Kishore Naval 《Environmental science and pollution research international》2020,27(31):38901-38915
Environmental Science and Pollution Research - The spatial and vertical distributions of radon and uranium are evaluated in relation to the hydrogeology, geomorphology, and hydrochemistry of... 相似文献
140.
Nadimuthu Lalith Pankaj Raj Victor Kirubakaran 《Environmental science and pollution research international》2021,28(26):34278-34289
Environmental Science and Pollution Research - The last mile connectivity through public transport is a challenging task in India. However, according to the Society of Indian Automotive... 相似文献