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排序方式: 共有262条查询结果,搜索用时 15 毫秒
211.
Bali Kunal Mishra Amit Kumar Singh Sachchidanand Chandra Subhash Lehahn Yoav 《Environmental science and pollution research international》2019,26(12):11940-11950
Environmental Science and Pollution Research - Dust storms affect the primary productivity of the ocean by providing necessary micronutrients to the surface layer. One such dust storm during March... 相似文献
212.
Amit Dhir Nagaraja Tejo Prakash Dhiraj Sud 《Environmental science and pollution research international》2012,19(9):3906-3913
This study evaluates the effect of integrated solar-assisted advanced oxidation process (AOP) and biological treatment on the extent of degradation of effluents from chlorination (C) and first alkaline extraction (E1) stages of soda pulp bleaching in agro-residue-based pulp and paper mill. Biodegradation of the effluents was attempted in suspended mode using activated sludge from the functional pulp and paper industry effluent treatment plant acclimatized to effluents in question. The photocatalytic treatment was employed using zinc oxide (ZnO) in slurry mode for decontamination of effluents in a batch manner and the degradation was evaluated in terms of reduction in chemical oxygen demand. The biological treatment (24?h) of C and E1 effluent resulted in 30 and 57?% of degradation, respectively. Solar-induced AOP of C and E1 effluents resulted in 53 and 43?% degradation under optimized conditions (2.5?g?L?1 ZnO at pH?8.0) after 6?h of exposure. For C effluent, a short duration of solar/ZnO (1?h) prior to biological treatment reduced the time required at biological step from 24 to 12?h for almost same extent (92?%) of degradation. However, sequential biological treatment (24?h) followed by solar/ZnO (2?h) resulted in 85.5?% degradation. In contrast, in the case of E1 effluent, sequential biological (24?h)?Csolar/ZnO (2?h) system effectively degrades effluent to 95.4?% as compared to 84.8?% degradation achieved in solar/ZnO (2?h)?Cbiological treatment (24?h) system. In the present study, the sequencing of photocatalysis with the biological treatment is observably efficient and technically viable process for the complete mineralization of the effluents. 相似文献
213.
Nirankar Singh Ravinder Agarwal Amit Awasthi Prabhat K. Gupta Susheel K. Mittal 《Atmospheric environment (Oxford, England : 1994)》2010,44(10):1292-1300
Aerosol (total suspended particulate) samples collected at three diverse locations (urban-commercial, semi-urban and rural-agricultural) in Patiala, India were analyzed for loss on ignition (LOI) and organic tarry matter (OTM) content in ambient air during crop residue burning (CRB) episodes and non-crop residue burning (NCRB) months in 2006–2007. Results showed high levels of LOI and OTM during wheat and rice crop residue-burning periods at all the sites. Higher levels were obtained during rice crop residue-burning period as compared to the wheat residue-burning period. At semi-urban site, LOI varied between 53 ± 36 μg m?3 and 257 ± 14 μg m?3 constituting 38–78% (w/w) part of the aerosols whereas levels of OTM varied between 0.98 ± 0.11 μg m?3 and 7.93 ± 2.76 μg m?3 comprising 0.42–3.28% (w/w) fraction. At rural-agricultural area site, levels of LOI varied between 86 ± 40 μg m?3 and 293 ± 70 μg m?3 comprising 27–84% (w/w), whereas OTM levels varied between 1.31 ± 0.64 μg m?3 and 10.09 ± 6.56 μg m?3 constituting 0.83–2.42% (w/w) fraction of the aerosols. At urban-cum-commercial site, levels of LOI and OTM varied between 48 ± 23 μg m?3 and 281 ± 152 μg m?3 and 2.53 ± 1.23 μg m?3 and 17.40 ± 8.50 μg m?3, constituting 24–62% (w/w) part of the aerosols, respectively. Results also indicated that OTM and LOI were integral parts of aerosols and their concentrations were influenced by the crop residue burning practices with incorporated effect of vehicular activities in Patiala. 相似文献
214.
Effluents originating from pesticides, agro-chemicals, textile dyes and dyestuffs industries are always associated with high
turbidity, colour, nutrient load, and heavy metals, toxic and persistent compounds. But even with such an anthropogenic nature,
these effluents contain dynamic cyanobacterial communities. Documentation of cyanobacterial cultures along the water channels
of effluents discharged by above mentioned industries along the west coast of India and their relationship with water quality
is reported in this study. Intensity of pollution was evaluated by physico-chemical analysis of water. Higher load of solids,
carbon and nutrients were found to be persistent throughout the analysis. Sediment and water samples were found to be colored
in nature. Cyanobacterial community structure was found to be influenced by the anthropogenic pollution. 40 different cyanobacterial
species were recorded from 14 genera of 5 families and an elevated occurrence of Phormidium, Oscillatoria and Chroococcus genera was observed in all the sampling sites. 相似文献
215.
Citation of cyanobacterial cultures from the shores of south west coast of Gujarat, India and their relationship with sea water quality, influenced by extensive pollutant runoff is reported in this study. Intensity of pollution was evaluated by physico-chemical analysis of water. Higher load of suspended solids (60–1000 mg l−1) and nutrients (PO4
−P: 1.3–4 μmole l−1 and NO3
−N: 12.5–17.8 μmole l−1) were persistent throughout the analysis. Community structure is seen to be influenced by such persistent pollution. Twenty nine cyanobacterial species were isolated belonging to 9 genera of 4 families, with an elevated occurrence of Oscillatoria and Lyngbya species. No heterocystous cyanobacteria were isolated throughout the study. 相似文献
216.
Giulia Longo Fernando Fresno Silvia Gross Urška Lavrenčič Štangar 《Environmental science and pollution research international》2014,21(19):11189-11197
BiVO4/TiO2 composites with different weight ratios have been prepared by coprecipitation-based reactions followed by either thermal or hydrothermal treatment with the aim of evaluating the TiO2 photosensitization by BiVO4. The obtained materials present in all cases the desired monoclinic phase of BiVO4 and anatase phase of TiO2. Visible light absorption increased with increasing amount of bismuth vanadate. XPS results reveal the surface enrichment of Ti with respect to the bulk composition in samples characterised by a higher content of BiVO4. The photocatalytic activity of the prepared materials was tested for the degradation of isopropanol in the gas phase under indoor illumination conditions. Although none of the composites was able to improve the activity of TiO2, the low BiVO4 containing samples appear as more suitable for further synthesis tuning. 相似文献
217.
Journal of Material Cycles and Waste Management - The utilization of fly ash in construction and cement industry increases from last few decades. But the question on utilization of fly ash for... 相似文献
218.
Polycyclic aromatic hydrocarbons (PAHs) are a class of environmental pollutants generated from incomplete combustion of organic materials. PAHs in tea have been studied for five locally available brands. Six to seven PAHs from list of 16 priority pollutants (US EPA) were found to be present in samples of various brands of tea. Benzo[a]pyrene (2A: probable human carcinogen) was found in two samples, and naphthalene (2B: possible human carcinogen) was found in all the tea samples. 相似文献
219.
A Wavelet-based Neural Network Model to Predict Ambient Air Pollutants’ Concentration 总被引:1,自引:0,他引:1
Amit Prakash Ujjwal Kumar Krishan Kumar V. K. Jain 《Environmental Modeling and Assessment》2011,16(5):503-517
The present paper proposes a wavelet based recurrent neural network model to forecast one step ahead hourly, daily mean and
daily maximum concentrations of ambient CO, NO2, NO, O3, SO2 and PM2.5 — the most prevalent air pollutants in urban atmosphere. The time series of each air pollutant has been decomposed into different
time-scale components using maximum overlap wavelet transform (MODWT). These time-scale components were made to pass through
Elman network. The number of nodes in the network was decided on the basis of the strength (power) of the corresponding input
signals. The wavelet network model was then used to obtain one-step ahead forecasts for a period extending from January 2009
to June 2010. The model results for out of sample forecast are reasonably good in terms of model performance parameters such
as mean absolute error (MAE), mean absolute percentage error (MAPE), root mean square error (RMSE), normalized mean absolute
error (NMSE), index of agreement (IOA) and standard average error (SAE). The MAPE values for daily maximum concentrations
of CO, NO2, NO, O3, SO2 and PM2.5 were found to be 9.5%, 17.37%, 21.20%, 13.79%, 17.77% and 11.94%, respectively, at ITO, Delhi, India. Bearing in
mind that the forecasts are for daily maximum concentrations tested over a long validation period, the forecast performance
of the model may be considered as reasonably good. The model results demonstrate that a judicious selection of wavelet network
design may be employed successfully for air quality forecasting. 相似文献
220.