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Kim, J. S.,Han, K. S.,Kim, S. J.,Kim, S. D.,Lee, J. Y.,Han, C.,Rajesh Kumar, J. Springer Science + Business Media 2016 Journal of Radioanalytical and Nuclear Chemistry Vol.307 No.2
<P>Synergistic extraction of uranium using amine combined with phosphorous based extractant systems was described. The present study focused on the continuous extraction processing of uranium to form precipitation under higher pH conditions and higher aqueous phase ratios. To address this, synergistic extraction studies were carried out with P-based extractants as synergists and investigations were done with better pairs with an aminebased extractant system. Finally, all of the developed synergistic extraction methodologies were compared with each other. This showed that Alamine 336 and D2EHPA was the best pair for uranium extraction, offering as much separation as possible from other associated metals.</P>
Effect of Cation Binding Agents on Sludge Solubilization Potential of Bacteria
S. Gopi Kumar,J. Merrylin,S. Kaliappan,S. Adish Kumar,염익태,J. Rajesh Banu 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.2
The aim of the present study is to increase sludge solubilization potential of bacteria by the addition of cation binding agents. During the study, three strains of bacteria B1, B2 and B3 were isolated from waste activated sludge acclimatized to a thermophilic condition (55°C). Using these strains the mixed liquor suspended solids degradation was 67, 59, and 33% and the chemical oxygen demand solubilization enhancement was 71, 62, and 36%compared with the control. Cation binding agents such as citric acid, ethylenediaminetetraacetate and sodium tripolyphosphate were added to enhance the sludge solubilization further. Among these, citric acid along with B1 was more effective in solubilization with the mixed liquor suspended solids degradation of 110% and the chemical oxygen demand solubilization enhancement of 115%. 16s rRNA technique was used to identify the bacterial species B1 and it was found to be Bacillus licheniformis. It was also observed that mixed liquor suspended solids reduced rapidly when more soluble chemical oxygen demand was released, thereby increasing sludge solubilization.
Leaching of rare earth metals (REMs) from Korean monazite concentrate
Panda, R.,Kumari, A.,Jha, M.K.,Hait, J.,Kumar, V.,Rajesh Kumar, J.,Lee, J.Y. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.4
Systematic scientific studies for dephosphorization and acid leaching of Korean monazite are reported here. 50% NaOH (w/v) solubilizes 99.99% phosphate, at 170<SUP>o</SUP>C, 100g/L pulp density in 4h. Kinetics of phosphate leaching fitted well with model ''chemical reaction control,'' i.e. 1-(1-X)<SUP>½</SUP>=k<SUB>c</SUB>t, E<SUB>a</SUB>=58.04kJ/mol. Further, rare earth hydroxides (REHs) was leached using 6N HCl at 90<SUP>o</SUP>C, 60g/L pulp density for 2h to recover ~95% REMs. Leach liquor generated can be further processed using solvent extraction/ion exchange techniques. From the pure solutions, metal/salts could be obtained using evaporation, precipitation, etc.
Rajesh Kumar Porwal,Vinod Yadava,J. Ramkumar 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.2
Thin sheets of titanium alloys are widely used in aerospace and automotive industries for specific applications. The creation of microholes with requisite hole quality in thin sheets of these alloys using energy of electric discharge is a challenging task for manufacturingengineers. Hole sinking electrical discharge micromachining (HS-EDMM) is one of the most promising micromachining processes tocreate symmetrical and non-symmetrical micro holes. The present paper is related to selection of optimum parameter settings for obtainingmaximum material removal, minimum tool wear and minimum hole taper in HS-EDMM. In this paper an attempt has been made todevelop an integrated model (ANN-GRA-PCA) of single hidden layer back propagation neural network (BPNN) for prediction and greyrelational analysis (GRA) coupled with principal component analysis (PCA) hybrid optimization strategy with multiple responses of HSEDMMof Ti-6Al-4V. Experiments have been conducted to generate dataset for training and testing of the network where input parametersconsist of gap voltage, capacitance of capacitor and the resulting performance parameters are represented by material removal rate(MRR), tool wear rate (TWR), and hole taper (Ta). The results indicate that the integrated model is capable to predict and optimize processperformance with reasonable accuracy under varied operating conditions of HS-EDMM. The proposed approach would be extendableto other configurations of EDMM processes for different materials.
Biomanagement of sago-sludge using an earthworm, Lampito mauritii.
Banu, J Rajesh,Yeom, Ick Tae,Esakkiraj,Kumar, Naresh,Lee, Young Woo,Vallinayagam, S The Academy 2008 Journal of environmental biology Vol.29 No.5
<P>In the present study vermicomposting was carried out at three different concentrations of sago-sludge namely 50, 75 and 100% with an indigenous earthworm, Lampito mauritii for a period of 50 days. The fecundity of earthworm Lampito mauritii was found to be high in 50%. At the end of 50 days composting period. There were about 12 cocoons, 5 juveniles and 2 nonclitellates appeared at 50% sago-sludge concentration. The microbial analysis showed that after 40 days of composting their population stabilized and further increase in composting period did not increase their population size. Chemical analysis of Lampito mauritii worked substrates showed there is a step wise increase of nitrogen and phosphorus. The fold increase of phosphorus and nitrogen were found to be high for sago-sludge undergoing vermicomposting than the control. From the initial value of 1.8, 1.4 and 0.5 mg kg(-1) total nitrogen increased in a stepwise manner and reached a value of 5.8, 3.9 and 2.3 mg kg(-1), respectively for vermicomposting at 50, 75 and 100%. During composting the organic carbon decreased from its initial value of 56, 74 and 107 mg kg(-1) to 15, 25 and 58 mg kg(-1) for vermicomposting and 34, 45 and 72 mg kg(-1) for 50, 70 and 100% control, respectively. The results indicate that 50% and 75% concentration of sludge mixed with bedding material was ideal for the vermicomposting.</P>
Biomanagement of sago-sludge using an earthworm, Eudrilus eugeniae.
Banu, J Rajesh,Yeom, Ick Tae,Esakkiraj, S,Kumar, Naresh,Logakanthi, S The Academy 2008 Journal of environmental biology Vol.29 No.2
<P>Sago, the tapioca starch is manufactured by over 800 small-scale units located in the Salem district, Tamil Nadu, India. During the processing of sago it generates huge quantities of biodegradable solid waste, as crushed tubers. In present study an attempt was made to convert these biodegradable solid sago tubers into value added compost using an exotic earthworm, Eudrilus eugeniae. The experiments were carried out in a plastic tray at various concentrations of sago-sludge (50% 75% and 100%) for a period of 90 days. During the vermicomposting, data were collected on life form (cocoon, non clitellates, clitellates) of earthworm and it was found to be high in 50% followed by 75% and 100% concentrations. Chemical analysis of worked substrates showed a step wise increase of nitrogen and phosphorus. The fold increase of phosphorus and nitrogen were found to be high for sago-sludge undergoing vermicomposting than the control. During the composting period the organic carbon decreased from its initial value of 58, 76 and 107 mg/kg to 21, 24 and 65 mg/kg for 50, 70 and 100%, respectively The microbial analysis showed that after 75 days of composting, their population stabilized and further increase in composting period did not increase their population size. The results indicate that 50% and 75% concentration of sludge mixed with bedding material was ideal for the vermicomposting.</P>
Banu, J. Rajesh,Kannah, R. Yukesh,Kavitha, S.,Gunasekaran, M.,Yeom, Ick Tae,Kumar, Gopalakrishnan Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.347 No.-
<P><B>Abstract</B></P> <P>The present study highlights the options to enhance the methane potential of partially digested anaerobic sludge using disperser-induced bacterial disintegration. Floc dispersion with no biomass disintegration was achieved at a disperser-specific energy input of 9.5 kJ/kg TS. The outcomes of both sole bacterial disintegration (S-BD) and disperser-induced bacterial disintegration (D-BD) were assessed in terms of changes in lysate, biopolymer release and increase in biodegradability and methane generation. A higher lysate solubilization of about 22.4% was achieved in D-BD compared to S-BD (11.3%), indicating the efficiency of floc dispersion prior to bacterial disintegration. The biochemical methane result implies that D-BD shows higher methane potential of 0. 279 gCOD/gCOD. Considering the overall outcome achieved in this study, disperser-induced bacterial disintegration is proved to be an effective disintegration process for enhanced biodegradation and higher methane production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Disintegration of digested sludge is a promising technique for bioenergy generation. </LI> <LI> Floc dispersion was achieved at lesser disperser input energy of 9.5 kJ/kg TS. </LI> <LI> A higher lysate solubilization of 22.4% was achieved in floc dispersed sample. </LI> <LI> Biopolymer release of floc dispersed sludge was higher (1379.8 and 394.2 mg/L) </LI> <LI> Result of methane reveals the effect of floc dispersion prior to disintegration. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
강민우,전종혁,J. Rajesh Kumar,이진영 한국폐기물자원순환학회 2023 한국폐기물자원순환학회지 Vol.40 No.3
The recovery and extraction of the vanadium and molybdenum from the spent dehydrogenation catalyst in chloride leach liquor was carried out by solvent extraction technique. The 15% of amine based extractants such as Alamine 336, Alamine 308 and Aliquat 336 diluted in 65% ANYSOL-150 (A-150) and modified by 20% octanol used for present investigations. Effect of time, pH, McCabe-Thiele study as well as stripping studies was established. And two title metal ions were analyzed by inductively coupled plasma optical emission spectrometer (ICP-OES) as analytical technique.