Showing papers by "P.K. Tewari published in 2014"
TL;DR: An all silica DDR (deca dodecasil rhombohedral) zeolite membrane with dense, interlocked structure has been developed for separation of H2 from HI/I2 mixture of HI decomposition reaction as discussed by the authors.
18 citations
TL;DR: In this article, the authors developed an understanding of transport processes inside PBMRs (packed bed membrane reactors) and evaluated the effectiveness of PBMR in increasing the conversion of hydrogen iodide decomposition reaction of the IS (iodine-sulfur) thermochemical cycle.
17 citations
TL;DR: In this paper, a poly-acryl hydroxamic acid was used for removing uranium from industrial wastewater using a poly(acrylamide) monomer by solution polymerization method.
Abstract: A novel sorbent, poly-acryl hydroxamic acid was prepared in-house from acrylamide monomer by solution polymerization method. Surface morphology and energy dispersive X-ray spectroscopy revealed that the sorbent was capable of encaging uranium from aqueous solution. Sorption potentials of uranium ions were investigated using the sorbent in dilute alkaline aqueous solution by varying pH of solution, sorbent quantities, contact time, initial uranium ion concentration and temperature of solution. Results from batch sorption experiment with simulated nuclear plant effluent showed the sorbent could remove uranium(VI) ions efficiently in presence of competitive ions such as Ca(II), Mg(II), Mn(II), Cu(II), Fe(III) and nitrate. Sorption characteristics were studied using Langmuir and Freundlich isotherms. The evaluated thermodynamic parameters indicated the present sorption process was endothermic and spontaneous. This work provided a promising and new sorbent for removing hazardous material like uranium from industrial wastewater.
14 citations
TL;DR: In this paper, a novel composite polymeric membrane prepared using composite of spray-dried silica granule and polysulfone is reported, which shows significant enhancement of water permeability without sacrificing for the separation performance.
13 citations
TL;DR: In this article, the technical feasibility studies of coupling 250m 3/day LTE and 2400m 3 /day MED-TVC seawater desalination plants coupled to Advanced Heavy Water Reactor (AHWR) are discussed in details.
7 citations
TL;DR: In this paper, the effect of various foulants (sodium alginate and humic acid) on the UF membrane was investigated in the range of 5-15ppm of various constitutes such as Iron, Manganese, and the organic foulants.
Abstract: Ultrafiltration (UF) membranes in capillary configuration are deployed in domestic water purification with respect to removal of contaminants. Fouling is an inherent phenomenon in UF process and has been reported to cause decline in flux, reduces membrane life, etc. So, it has to be thoroughly studied in order to optimise the logistics of process operation. Considering the concentration of contaminants in different parts of India, the fouling studies investigations were carried out in the range of 5–15 ppm of various constitutes such as Iron, Manganese, and the organic foulants – sodium alginate and humic acid. Out of various parameters affecting fouling like feed pressure, feed temperature, feed pH, the effort was directed towards studying the effect of various foulants (and at different loadings) on the membrane. Results obtained from experiments suggest that the fouling caused by the organics (sodium alginate and humic acid) is higher than that of inorganics (iron and manganese). Iron caused hi...
6 citations
TL;DR: In this article, both reverse osmosis and forward Osmosis (FO) experiments are conducted to concentrate simulated inactive ammonium diuranate (ADU) filtered effluent solution (by mixing uranyl nitrate and ammonium nitrate) using indigenously developed cellulose acetate blend (CAB) and thin-film composite polyamide (TFCP) membranes.
Abstract: In this study, both reverse osmosis (RO) and forward osmosis (FO) experiments are conducted to concentrate simulated inactive ammonium diuranate (ADU) filtered effluent solution (by mixing uranyl nitrate and ammonium nitrate) using indigenously developed cellulose acetate blend (CAB) and thin-film composite polyamide (TFCP) membranes. Both the membranes are prepared and characterized in terms of pure water permeability and solute rejection for 2000 ppm NaCl feed, water contact angle and surface average roughness. Subsequently, testing of volume reduction and concentration of simulated ADU effluent solution are carried out using custom made RO and FO testing systems. It is found that in RO process, the performance in terms of volume reduction factor and concentration factor with respect to uranium for both CAB and TFCP membranes are comparable but the CAB membranes show better performance than the TFCP membranes in FO modes. The concentration of ammonium nitrate is less in RO concentrate than in th...
4 citations