NOPR Collection:

Recovery and utilization of wash water solids generated during ilmenite leaching operation

Mon, 01 Jun 2015 00:00:00 GMT

Title: Recovery and utilization of wash water solids generated during ilmenite leaching operation Authors: George, J; Nair, V V; Ninan, G; Nair, K Abstract: The solid content in the spent wash water generated during leaching operations in chloride process for the production of TiO₂ pigment is not recovered and considered waste. A method is proposed for the recovery of the solids and enrichment of titanium values in these solids. The composition of the recovered and enriched solids is determined by atomic absorption spectroscopy and other analytical techniques. The samples are characterized using X-ray diffraction (XRD) and scanning electron microscope. (SEM). The pigmentary qualities of the recovered material are studied in enamel paint formulations and compared against commercial rutile TiO₂ pigment. Partial replacement of the TiO₂ pigment with the recovered material has not made any significant impact on the various characteristics studied and approached the commercial rutile TiO₂ pigment standards. Also partial replacement realizes a TiO₂ saving in enamel paint formulations. Page(s): 362-366

Dynamic adsorption modeling study using a modified Redilch-Peterson isotherm model

Mon, 01 Jun 2015 00:00:00 GMT

Title: Dynamic adsorption modeling study using a modified Redilch-Peterson isotherm model Authors: Suganya, E; Rangabhashiyam, S; Varghese, L A; Selvaraju, N Abstract: The untreated grey water generated by domestic activities is the major sanitation problem. From the industrial point of view, the modeling approach of three parameter isotherm model Redilch-Peterson based on the column system has been considered. A theoretical one dimension dynamic model was proposed to understand the behaviour in fixed bed, assuming Straight run mode to study the phenomenon of adsorption. Using MATLAB linear programming and least square method the parameters involved have been optimized. Thus predicted results are correlated with the theory and experimental observation available in the literature using Mathematical derivation and MATLAB. Thus a modified Redilch-Peterson isotherm model in packed bed for waste water treatment has been proposed. Page(s): 358-361

Power Quality Improvement of Grid Connected Solar System

Mon, 01 Jun 2015 00:00:00 GMT

Title: Power Quality Improvement of Grid Connected Solar System Authors: Karunambigai, S; Geetha, K; Shabeer, H A Abstract: The need to generate pollution free energy has triggered the effect towards the usage of solar energy interconnection with the grid. Consequently, the Photovoltaic [PV] panel interfaced with the grid causes the power quality problems such as a harmonics, voltage sag etc., Active power filters are the powerful tool for mitigation of harmonics. This proposed work describes the methodology for improving power quality of the grid interfaced with renewable energy. The inverter used in this methodology can also be used as a power converter for injecting power from solar to grid along with harmonic compensation. The proposed concept is validated through dynamic simulation using MATLAB/Simulink Power system toolbox. Page(s): 354-357

Extraction of bovine serum albumin using aqueous two-phase poly (ethylene glycol) – poly (acrylic acid) system

Mon, 01 Jun 2015 00:00:00 GMT

Title: Extraction of bovine serum albumin using aqueous two-phase poly (ethylene glycol) – poly (acrylic acid) system Authors: Settu, S; Velmurugan, P; Jonnalagadda, R R; Nair, B U Abstract: The partitioning behavior of bovine serum albumin in a new aqueous two-phase system (ATPS) based on low cost commercial polymers like poly (ethy1ene glycol) (PEG) and poly (acrylic acid) (PAA) has been studied. In this ATPS, PAA and PEG are enriched in the bottom and upper phase, respectively. The influence of molecular weight (MW), tie line length, pH, temperatures and NaCl concentration on the partition coefficient of protein has been studied. The protein partitioning decreases on increasing MW of PEG and temperature, whereas increases with an increasing pH and NaCl concentration. This may be attributed by strong electrostatic interactions between the proteins and polymer as well as excluded volume effects. Protein partitioning is better for PEG4000 at 0^oC, pH 8.0 with 1 M NaCl with a yield 88.8%. The present study indicates that PEG-PAA ATPS may be considered as an interesting alternative for protein purification from the biological suspensions. Page(s): 348-353