Microorganisms Used in Bioleaching Metals Converting Waste Foundry Sands into Soil Suitable for Growing Crops | Chapter 11 | Current Research in Science and Technology Vol. 2

Metals can be leached either directly (physical contact between microorganisms and solid material) or indirectly. The removal of metals from these industrial wastes brings out detoxification of the residues and thus improves the quality of the environment. The waste foundry sand was analyzed for the presence of toxic metals, as the plant uptakes these toxic metals through their food chain which in turn may be harmful to the human beings.

Author(s) Details

S. Vijayakumari
Department of Microbiology, School of Life Sciences, Vels Institute of Science Technology and Advanced Studies (VISTAS), Chennai 600117, India.

Elango Padmasini
Department of Microbiology, School of Life Sciences, Vels Institute of Science Technology and Advanced Studies (VISTAS), Chennai 600117, India.

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Evaluation and Optimization of Performance Characteristics of Wood Ash Particles Reinforced PP Resin (WARPP) | Chapter 10 | Current Research in Science and Technology Vol. 2

This study focused on Evaluation and Optimization of Performance Characteristics of Wood Ash Particles Reinforced Polypropylene Resin (WARPP). Taguchi robust design was used to plan a minimum number of experiments needed to optimize the performance characteristics of WARPP while response surface method (RSM) was used to model and optimize performance characteristics of WARPP. The performance characteristics or responses of WARPP for the mechanical properties are the result of the interaction among the input variables – namely, particle size, volume fraction, injection force and operating temperature. The optimum values of the mechanical properties (tensile, flexural and hardness strength) of WARPP are 21.19MPa, 50.09MPa and 521.84MPa, respectively with their corresponding input variables values of 0.25 mm, 1.40 mm and 1.40 mm for particle size, 5.0%, 5.0% and 60% volume fraction, 120 ton, 200 ton and 200 ton injection force and 185ºC, 215ºC and 215ºC operating temperature. The response model of WARPP for tensile, flexural and hardness are representable with nonlinear power law model and second order polynomial models respectively. Further investigations are recommended for testing WARPP under higher temperature applications to ascertain its performance at elevated temperatures.

Author(s) Details

P. S. Aguh
Department of Industrial and Production Engineering, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.

C. C. Ihueze
Department of Industrial and Production Engineering, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.

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Phytochemical Analysis, Antimicrobial and Antioxidant Activity of Clitoria ternatea leaves of Blue and White Flower | Chapter 09 | Current Research in Science and Technology Vol. 2

The present study was conducted to screen the phytochemical constituents, identifying the compounds present by Gas Chromatography-Mass Spectrometric analysis (GC-MS), functional groups present by Fourier Transform Infrared Spectrophotometer (FT- IR) in the ethyl acetate leaf extract of Clitoria ternatea white flower, explicit the antibacterial activity, antioxidant assay of using methanol and ethyl acetate leaves extract of Clitoria ternatea blue and white flower. Clitoria ternatea leaves of blue flower possess 7.5% of total ash whereas leaves of white flower possess 8.5%. The phytochemical analysis revealed that leaves of blue flower contain alkaloids, flavonoids, phenols, terpenoids, glycosides, coumarins, catechol, quinines, gum and mucilage while, in leaves of white flower had alkaloids, glycosides, catechol, gum and mucilage were present. A total of 8 compounds such as 1- Decanol, 2- ethyl, 1- Eicosanol, Sulphurous acid octadecyl 2- propyl ester, Eicosanoic acid, L- (+)- ascorbic acid 2,6- dihexadecanoate, Sulphurous acid, pentadecyl 2-propyl ester, Oleic acid, 1-Hexyl-2 nitrocyclohexane were detected in the ethyl acetate leaves extract of C. ternatea white flower using GC-MS. FT-IR analysis of the same had  characteristic bands at 2983.88 cmˉ1 indicating the presence of C-H stretching. The ethyl acetate leaves extract of white flower C. ternatea had antibacterial and antifungal activity against E. coli, S. aureus, K. pneumoniae, P. aeruginosa, P. mirabilis, C. albicans, C. tropicalis, C. kruzi. The total phenolic content of methanolic leaf extract of C. ternatea blue flower was 25 mg Gallic Acid Equivalent/ g Dry Weight (mg GAE / g DW), and leaf of white flower was 18 mg GAE / g DW. The total flavonoid content of methanolic leaf extract of C. ternatea blue flower was 10 mg Quercetin Equivalent/g Dry Weight (mg QE / g DW), and leaf of white flower was 5 mg QE/g DW. Maximum scavenging activity of 86.6% was observed in leaf ethyl acetate extract of blue flower (DPPH assay). Maximum scavenging activity of 82% (H2O2 assay) and 95% (total antioxidant) was observed in the ethyl acetate leaf extract of white flower. 

Author(s) Details

J. Anbumalarmathi
Department of Biotechnology, Stella Maris College (Autonomous), Chennai -600 086, India.

A. Divya
Department of Biotechnology, Stella Maris College (Autonomous), Chennai -600 086, India.

S. Aruna Sharmili
Department of Biotechnology, Stella Maris College (Autonomous), Chennai -600 086, India.

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Fluid Flow in Bifurcating Rectangular Porous Systems under Magnetic Field Influence | Chapter 08 | Current Research in Science and Technology Vol. 2

Steady MHD fluid flow in a bifurcating rectangular porous channel is presented. The governing nonlinear equations are solved analytically by the methods of similarity transformation and regular perturbation series expansions. Expressions for the temperature, concentration and velocity are obtained and analyzed graphically. The results show that increase in bifurcation angle and Grashof numbers increase the transport velocity, whereas the increase in the magnetic field parameter decreases it. Furthermore, it is seen that an increase in bifurcation angle increases the temperature of the flow.

Author(s) Details

W. I. A. Okuyade
Department of Mathematics and Statistics, University of Port Harcourt, Port Harcourt, Nigeria.

T. M. Abbey
Applied Mathematics and Theoretical Physics Group, Department of Physics, University of Port Harcourt, Port Harcourt, Nigeria.

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Pressure Drop and Heat Transfer Analysis for Satisfactory Operating Conditions of Rotary Heat Exchangers | Chapter 07 | Current Research in Science and Technology Vol. 2

A computational analysis in a rotary heat exchanger subject to pre-established mass flow rate is performed. The heat transfer rate, the pressure drop and the outlet temperatures of gas streams are calculated from different matrix porosity values. The fluid flow and the convective heat transfer coefficient are determined from correlations. The total heat transfer is obtained using the Effectiveness-NTU method specific to rotary heat exchangers. Three typical rotary exchangers with both streams under the laminar flow regime are investigated. A range of porosity values that provide good thermal exchange and low pressure drop in the equipment is chosen for each examined equipment. The behavior of the outlet temperatures of each gas stream as function of porosity is also analyzed. The results show that the porosity ranges shorten when the typical pressured drop values for each rotary exchanger are introduced in the analysis. In addition, the behavior of the outlet temperatures is compatible with the behavior of the heat transfer rate as the porosity changes.

Author(s) Details

P. C. Mioralli
Federal Institute of São Paulo – IFSP, Campus Catanduva, Brazil.

E. Avallone
Federal Institute of São Paulo – IFSP, Campus Catanduva, Brazil.

P. H. Palota
Federal Institute of São Paulo – IFSP, Campus Catanduva, Brazil.

P. S. G. Natividade
Federal Institute of São Paulo – IFSP, Campus Catanduva, Brazil.

C. E. Luizete
Federal Institute of São Paulo – IFSP, Campus Catanduva, Brazil.

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Development of an Economical Automatic Temperature and Time Control Multipurpose Dryer | Chapter 06 | Current Research in Science and Technology Vol. 2

Many dryers exist in the open markets for drying several agricultural crops in Africa. Most of them have their limitations and complexities. The significant ones are expensive and cannot be afford by the peasant farmers. Those developed locally are inefficient especially where temperature control is required. There is need to develop appropriate systems that will ensure effective temperature control without compromising the quality parameters of products. Time control is also a challenge due to unstable power supply which result to calculation of drying time not the same as working hours of the dryer for existing dryers. A digital microprocessor base temperature control and time control dryer has been developed and fabricated for drying any type of biomaterial at varying temperature range using locally available materials. The fabricated temperature and time control multipurpose dryer was test to ascertain its performance, the preset temperature control the ON/OFF the heating helix in the drying chamber within room temperature to 110°C and the temperature control was compared with three different types of digital temperature meters. The time control was also tested to clock only when the dryer is powered. Some selected biomaterial (Cassava, maize, cocoyam) with moisture content between 13 – 26% MCwb was dried for an average time of about 6-8 hours at 60°c temperature and the air velocity of the drying process was 0.4-0.75 m/s2.

Author(s) Details

Engr. P. A. Obasa (OND, HND, PGD, MENG, NIM, NIAE, IAENG, COREN Regd.)
Department Agricultural and Bioresources Engineering, Federal University of Technology Minna, Nigeria.

Prof. O. C. Ademosun (B.Sc. (Hons); M.Sc., Ph.D., FNIAE, FNSE, COREN Regd.)
Department Agricultural and Environmental Engineering, Federal University of Technology Akure, Nigeria.

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Assessment of Key Ground Water Quality Parameters and Their Mapping Using GIS in Central Brahmaputra Valley Zone of Assam, India | Chapter 05 | Current Research in Science and Technology Vol. 2

Groundwater is considered as one of major part of the purest forms of water available in nature. Hence, to understand the use of the ground water resources and to get sustainable ground water quality the fundamental characteristics of the groundwater need to be analyzed. In the present study, GIS-based mapping of the groundwater in the central Brahmaputra Valley Zone is done with a view to observe the various quality characters. The results of this investigation could be used by decision-makers for the sustainable management of groundwater resources. The groundwater pH of the district was found to be within the desirable limit as recommended by WHO but 67.30% sample covering 79% of the total geographical area of the district was slightly alkaline in nature. Groundwater quality parameters that surpassed the desirable limit recommended by WHO, were electrical conductivity and nitrate which accounted for 41.22% and 0.79% of the total samples. Total Dissolved Solids, calcium, magnesium, carbonate, bicarbonate and nitrate in groundwater were recorded within the desirable limit of WHO and thus could be considered as safe. Spatial autocorrelation run for all the quality parameters with respect to their positions and values over the entire district envisaged the possibilities of forming different pattern namely CLUSTER for pH, EC, As, F, Fe, Al, Mn,HCO3, RANDOM for Mg, Ca, CO3, NO3, SO4 and DISPERSED for TDS. GIS-aided mapping of groundwater quality parameters embracing their category wise spatial distribution, area, maximum and minimum values, surface autocorrelation of observed values could give a better idea to opt for suitable need-based management strategy for the entire district.

Author(s) Details

Dr. I. H. Thakuria
Agricultural Development Officer, Government of Assam, India.

P. P. Hazarika
Department of Soil Science, Assam Agricultural University, Assam, India.

Dr. B. K. Medhi
Department of Soil Science, Assam Agricultural University, Assam, India

Mr. K. Deka
Assam Agricultural University, Assam, India.

Dr. N. Rahman
RARS, Sillongoni, Assam, India.

Dr. N. Baruah
Biswanath College of Agriculture, Assam Agricultural University, Assam, India.

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