Papers by Rajesh Biniwale
International Journal of Industrial Chemistry, 2019
The present research work is focussed on the treatment of leachate generated from crude oil-conta... more The present research work is focussed on the treatment of leachate generated from crude oil-contaminated soil sites using wet air oxidation as an advanced oxidation process. The factors affecting the wet air oxidation (WAO) process, viz. temperature, pressure and time of treatment were optimized using central composite design and response surface methodology. The significant factors were optimized to maximize % COD removal from the leachate. The linear effects of pressure and temperature (p = 0.000); the square effects of pressure (p = 0.019) and time (p = 0.007) and the interaction effect of temperature-pressure (p = 0.002) were found to be significantly governing the % COD removal. The maximum COD removal of 76% was obtained at temperature = 244 °C, time = 30 min and pressure = 5 bar. Further, the biodegradability index (BOD 5 /COD) increased from 0.14 ± 0.007 of the untreated leachate to 0.48 ± 0.02 of the wetox-treated leachate. Moreover, the degradation of recalcitrant hydrocarbons in initial leachate by WAO treatment was confirmed using GC-MS analysis.
International Journal of Computer Sciences and Engineering, 2018
Environmental monitoring and assessment, 2018
India's tourism industry has emerged as a leading industry with a potential to grow further i... more India's tourism industry has emerged as a leading industry with a potential to grow further in the next few decades. Dehradun, one of the famous tourist places in India located in the state of Uttarakhand, attracts tourist from all over the country and abroad. The surge in tourist number paved the way for new infrastructure projects like roads, buildings, and hotels, which in turn affects the topography of the mountainous region. In this study, remote sensing and GIS techniques have been used to assess the impact of tourism on the land environment of Dehradun. Satellite images of the years 1972, 2000, and 2016 were analyzed using object-based image analysis (OBIA) to derive land use and land cover (LULC) and ASTER-DEM (Digital Elevation Model) was used to determine the topography of the study area. LULC classification includes built-up, vegetation, forest, scrub, agriculture, plantation, and water body. The slope of the region was categorized as gentle, moderate, strong, extreme...
Materials Chemistry and Physics, 2010
Separation Science and Technology, 2014
ABSTRACT Adsorption of CO2, CH4, and N2 has been investigated using amine functionalized polymeri... more ABSTRACT Adsorption of CO2, CH4, and N2 has been investigated using amine functionalized polymeric resins having diethanolamine, imidazole, dimethylamine, and N-methyl piperazine covalently attached to the styrene-divinyl benzene copolymer (PS) matrix. The equilibrium adsorption of CO2, CH4, and N2 was examined on these functionalized polymers at pressures from atmospheric to 40 atm for CO2 and N2 while up to 10 atm for CH4 at 303 K. PS-Imidazole showed the highest adsorption capacity for CO2 as compared to other functionalized polymers. No significant uptake of CH4 and N2 was observed at low pressures by any of the functionalized polymers. The adsorption isotherms were analyzed using dual mode sorption model and Ideal Adsorbed Solution Theory (IAST).
Separation Science and Technology, 2014
ABSTRACT Adsorption of CO2, CH4, and N2 was investigated using pulse concentration chromatography... more ABSTRACT Adsorption of CO2, CH4, and N2 was investigated using pulse concentration chromatography on polystyrene functionalized by covalently attached diethanolamine, dimethylamine, imidazole, and N-methyl piperazine. The adsorption equilibrium constants at different temperatures were estimated by fitting the experimental chromatograms into a non-linear equilibrium dispersive chromatography model using gPROMS. Axial dispersion was found to be the controlling mechanism for dispersion of the chromatograms. The heat of adsorption and corresponding equilibrium selectivities were determined from the adsorption equilibrium constants. The imidazole based adsorbent showed the highest affinity for CO2.
Materials Challenges and Testing for Manufacturing, Mobility, Biomedical Applications and Climate, 2014
Carbon dioxide is a green house gas and its emissions from large stationary sources like coal bas... more Carbon dioxide is a green house gas and its emissions from large stationary sources like coal based power plants is a global catastrophe. Keeping in view the limitations associated with the reported adsorbents, development of new functionalised adsorbents based on immobilized amines is attempted in the present work. The synthesised adsorbents were thoroughly characterised using various techniques namely XRD, SEM, FTIR to determine the physico-chemical, structural and morphological properties before and after modification. The characterisation results have confirmed that the ordered porous structure of zeolite was retained after modification of only the surface and retaining the porosity and pore volume which is highly desired for an efficient adsorbent. These functionalised adsorbents were evaluated using continuous flow through packed bed reactors and simulated stream of ~15 % CO2 rest N2 to determine adsorption capacity and other breakthrough parameters. It was observed that after incorporation of amines, the adsorption capacity of zeolite was significantly improved and was comparable to the benchmark adsorbents. The results clearly demonstrate high uptake of CO2 in amine treated zeolite, almost in the temperature range of flue gas (50–120 °C). The investigations based on amine modified zeolites are promising showing better adsorption capacities and selectivities and are expected to overcome the limitations of conventional adsorbents.
International Journal of Environmental Science and Technology, 2013
Absorption of nitric oxide from nitric oxide /air mixture in hydrogen peroxide solution has been ... more Absorption of nitric oxide from nitric oxide /air mixture in hydrogen peroxide solution has been studied on bench scale internal loop airlift reactor. The objective of this investigation was to study the performance of nitric oxide absorption in hydrogen peroxide solution in the airlift reactor and to explore/determine the optimum conditions using response surface methodology. A Box-Behnken model has been employed as an experimental design. The effect of three independent variables-namely nitric oxide gas velocity, 0.02-0.11 m/s; nitric oxide gas concentration, 300-3,000 ppm and hydrogen peroxide concentration, 0.25-2.5 %-has been studied on the absorption of nitric oxide in aqueous hydrogen peroxide in the semi-batch mode of experiments. The optimal conditions for parameters were found to be nitric oxide gas velocity, 0.02 m/s; nitric oxide gas concentration, 2,246 ppm and hydrogen peroxide concentration, 2.1 %. Under these conditions, the experimental nitric oxide absorption efficiency was observed to be *65 %. The proposed model equation using response surface methodology has shown good agreement with the experimental data, with a correlation coefficient (R 2) of 0.983. The results showed that optimised conditions could be used for the efficient absorption of nitric oxide in the flue gas emanating from industries.
Catalysis Letters, 2005
The conversion of hydrocarbon fuels such as gasoline and diesel is a potential source for hydroge... more The conversion of hydrocarbon fuels such as gasoline and diesel is a potential source for hydrogen production towards various fuel cell systems. A novel spray pulsed mode reactor to create alternate wet and dry conditions on the catalyst surface has been used in this study to enhance the rates of hydrogen production compared with the solid-gas phase reaction due to the improvement of the catalyst reactant contact. The production of hydrogen-rich gas by reforming of iso-octane (2,2,4-trimethylepentane) in the presence of steam and air has been studied at 600 and 700°C over Ni-Mn and Rh-Ce bimetallic catalysts supported on alumina mesh. The feed rate of iso-octane was varied from 0.553 to 5.53 m mol min)1 by controlling pulse injection in terms of the width and frequency of injection of iso-octane. Based on the product analysis optimized condition for higher hydrogen production and high H 2 /CO ratio has been deduced.
Ve hicular emission is the major contributor to the air pollution problem because of the increase... more Ve hicular emission is the major contributor to the air pollution problem because of the increased vehicle population. A technology is needed to control autoexhaust pollution problem so as to meet the emission standards set up by government legislation and the upcoming more stringent emission norms. The catalytic converter is successfully utilized to control air pollution from vehicular emissions. National Environmental Engineering Research Institute (NEERI) has developed a non-noble metal based catalytic converter considering the present and future emission standards. These non-noble metal based converters can also be fitted to old, on-road vehicles, which shares major part of total vehicular emissions, and thus a large market is readily available. Financial analysis reveals that the technology is cost-effective and has wide commercial application.
Perovskite type non-noble metal-based catalytic materials have been developed for their possible ... more Perovskite type non-noble metal-based catalytic materials have been developed for their possible applications in diesel exhaust emission control. These materials have been evaluated for their applications in regeneration of diesel particulate filter (DPF) and also as diesel catalytic converter (DCC). Both the applications require low temperature oxidation catalysis properties. Temperature-programmed desorption studies revealed the lowtemperature oxygen desorption of perovskite catalyst, which may be useful for the oxidation of carbon/soot at lower temperature. Laboratory evaluation results on activated carbon show the carbon oxidation activity of the catalyst in a temperature range of 300-450°°C. However, this was achieved under the tight contact of carbon and catalyst. Catalyst coated-ceramic foams have been used to fabricate laboratory prototype of regenerative type DPF. Although its evaluation on a vehicle shows significant reduction in smoke density, however, the regeneration temperature was still higher than desired. The DCC shows 10-25% reduction in smoke density depending on engine conditions. The perovskite-type catalyst appears to follow a redox mechanism for soot oxidation through oxygen removal and replenishment, while hydrocarbons adsorbed on soot particles may also help in oxidation of the carbonaceous part.
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Papers by Rajesh Biniwale