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排序方式: 共有215条查询结果,搜索用时 62 毫秒
201.
Ghosh Ananya Meshram Nilesh Kumar Saha Rajnarayan 《Environmental science and pollution research international》2019,26(12):11951-11961
Environmental Science and Pollution Research - NZVI has long been used for the remediation of different groundwater contaminants but their tendency to get oxidized easily has always been a barrier... 相似文献
202.
Sebak Kumar Saha 《Disasters》2017,41(3):505-526
This paper investigates why households migrated as a unit to Khulna City from the affected Upazilas of Dacope and Koyra in Khulna District, Bangladesh, following Cyclone Aila on 25 May 2009. The study reveals that households migrated primarily because of the livelihood stress that resulted from the failure to derive a secure income like before the event from the impacted areas—other push and pull factors also played a part in their migration decision. Despite all of the Aila‐induced losses and problems, all households wanted to avoid migration, but they were unable to do so for this principal reason. The findings also demonstrate that, if livelihoods cannot be restored, some form of widespread migration is inevitable after a disaster such as this one. In addition, they show that migration has the potential to serve as a key adaptive response to environmental events, as evidenced by the improved economic conditions of a substantial number of the migrated households. 相似文献
203.
Naidoo Kristina Chuturgoon Anil Cliff Geremy Singh Sanil Ellis Megan Otway Nicholas Vosloo Andre Gregory Michael 《Environmental science and pollution research international》2017,24(20):16798-16805
Environmental Science and Pollution Research - We studied the possible metal offloading onto the progeny of three pregnant female ragged-tooth sharks (Carcharias taurus) (C. taurus). The presences... 相似文献
204.
Michael J. Pilat Anil Prem 《Journal of the Air & Waste Management Association (1995)》2013,63(10):982-988
The overall particle collection efficiencies of spray scrubbers using monodisperse droplets of 100,500, and 1000 microns diameter were calculated for the cases of evaporating and condensing droplets. The properties of the gas at the inlet to the spray scrubber were maintained constant at 150°F, 100% relative humidity, and 1 atmosphere pressure. At the liquid entrance to the spray scrubber, the water droplet temperature was 50° F for the condensing case and 180° F for the evaporating case. The liquid to gas flow rate ratio for all the calculations was held constant at 4 gal/1000 acf. The gas velocity in the co-current spray tower was 1 ft/sec in the downwind direction. The calculation results show that for the particles in the 0.01 to 10 Mm diameter range, the overall spray scrubber particle collection efficiency is greater with the cooler 50°F water (condensing case) than with the warmer 180°F water (evaporating case). The effect of diffusiophoresis and thermophoresis is noticeable for all the water droplet sizes considered, but is more significant for the larger water droplets. This greater effect for the larger water droplets compared to the smaller droplets is due to the longer existence of the temperature and water vapor concentration gradients between the water droplets and the surrounding gas. 相似文献
205.
Artificial neural network (ANN) modeling of adsorption of methylene blue by NaOH-modified rice husk in a fixed-bed column system 总被引:1,自引:0,他引:1
Shamik Chowdhury Papita Das Saha 《Environmental science and pollution research international》2013,20(2):1050-1058
In this study, rice husk was modified with NaOH and used as adsorbent for dynamic adsorption of methylene blue (MB) from aqueous solutions. Continuous removal of MB from aqueous solutions was studied in a laboratory scale fixed-bed column packed with NaOH-modified rice husk (NMRH). Effect of different flow rates and bed heights on the column breakthrough performance was investigated. In order to determine the most suitable model for describing the adsorption kinetics of MB in the fixed-bed column system, the bed depth service time (BDST) model as well as the Thomas model was fitted to the experimental data. An artificial neural network (ANN)-based model was also developed for describing the dynamic dye adsorption process. An extensive error analysis was carried out between experimental data and data predicted by the models by using the following error functions: correlation coefficient (R 2), average relative error, sum of the absolute error and Chi-square statistic test (χ 2). Results show that with increasing bed height and decreasing flow rate, the breakthrough time was delayed. All the error functions yielded minimum values for the ANN model than the traditional models (BDST and Thomas), suggesting that the ANN model is the most suitable model to describe the fixed-bed adsorption of MB by NMRH. It is also more rational and reliable to interpret dynamic dye adsorption data through a process of ANN architecture. 相似文献
206.
Anil Kumar Singh Swaranjit Singh Cameotra 《Environmental science and pollution research international》2013,20(10):7367-7376
This study describes the potential application of lipopeptide biosurfactants in removal of petroleum hydrocarbons and heavy metals from the soil samples collected from industrial dumping site. High concentrations of heavy metals (like iron, lead, nickel, cadmium, copper, cobalt and zinc) and petroleum hydrocarbons were present in the contaminated soil samples. Lipopeptide biosurfactant, consisting of surfactin and fengycin was obtained from Bacillus subtilis A21. Soil washing with biosurfactant solution removed significant amount of petroleum hydrocarbon (64.5 %) and metals namely cadmium (44.2 %), cobalt (35.4 %), lead (40.3 %), nickel (32.2 %), copper (26.2 %) and zinc (32.07 %). Parameters like surfactant concentration, temperature, agitation condition and pH of the washing solution influenced the pollutant removing ability of biosurfactant mixture. Biosurfactant exhibited substantial hydrocarbon solubility above its critical micelle concentration. During washing, 50 % of biosurfactant was sorbed to the soil particles decreasing effective concentration during washing process. Biosurfactant washed soil exhibited 100 % mustard seed germination contradictory to water washed soil where no germination was observed. The results indicate that the soil washing with mixture of lipopeptide biosurfactants at concentrations above its critical micelle concentration can be an efficient and environment friendly approach for removing pollutants (petroleum hydrocarbon and heavy metals) from contaminated soil. 相似文献
207.
Environment Systems and Decisions - Capacity building and monitoring of response capacity are critical to disaster preparedness. Assessing disaster response capacity is a challenging task in India... 相似文献
208.
Garai Pramita Banerjee Priyajit Sharma Pramita Chatterjee Arnab Bhattacharya Ritwick Saha Nimai Chandra 《Environmental science and pollution research international》2022,29(58):87319-87333
Environmental Science and Pollution Research - Lactic and formic acid are two commonly found monocarboxylic organic acids. Lactic acid is discharged into the water bodies as acidic industrial... 相似文献
209.
Bhattacharyya Sudip Poi Rajlakshmi Mandal Swagata Baskey Sen Moni Hazra Dipak Kumar Saha Supradip Karmakar Rajib 《Environmental science and pollution research international》2022,29(12):17188-17188
Environmental Science and Pollution Research - 相似文献
210.
Polas Mohammad Rashed Hasan Saha Ratul Kumar Tabash Mosab I. 《Environment, Development and Sustainability》2022,24(3):3659-3686
Environment, Development and Sustainability - The paper aims to identify the factors that cause prospective tourists’ hesitation to travel. The study also examines whether this relationship... 相似文献