Environmental risk assessment of a tropical landfill: a case study of Aladinma landfill, Imo state, eastern Niger delta basin, southeastern Nigeria
Environmental risk assessment of Aladinma Landfill in Owerri metropolis of Imo State, Eastern Niger Delta Basin, Southeastern Nigeria was investigated by analyzing the soil and ambient air quality within the landfill as well as nearby surface and groundwater resources using standard soil equipment, Growcon digital gas monitors, standard plate count and Atomic Absorption Spectrophotometer (AA S) . The results of the soil analysis shows that the soil samples obtained at depths of 1.0m and 2.5m within the landfill are acidic (pH range: 5.40- 6.30). The mean concentrations of Cd2+ and Pb2+ in the soil at the depth of 1.0m are 466.67 and 412mg/kg respectively while the mean values at 2.5m depth are 406.67 and 406mg/kg respectively; these values are not in conformity with PCD soil standard. Except for Na+ , Cu2+ and PO43- , all other measured chemical parameters in the soil decreases with increase in depth. The ambient air quality analysis within the landfill shows that the mean concentrations of NO2 and SO2 are 0.33 and 15.33 ppm respectively and these values do not conform with United State Environmental Protection Agency (USEPA) 2004 ambient air quality standard. Other measured gaseous emissions were in conformity with USEPA (2004) air quality standard. The investigation also show that about 1,500 persons who live 100m away from the landfill are at very high risk to the effects of air pollution from the landfill while about 12,000 persons who live 5km from it are at low risk. The chemical analysis of groundwater within 4km from the landfill indicates that they are acidic (pH range: 6.30- 6.45). Although the pH of the closest surface water (Otamiri River) located at a distance of about 8km from the landfill conformed with World Health Organization(WHO) 2006 drinking water standard, the microbial assay did not conform with the standard. Other measured chemical parameters in the groundwater and surface water were in conformity with WHO (2006) standard. The acidic nature of the soil within the landfill as well as the groundwater resources near it is attributed to the high concentrations of SO2and NO2 at the landfill while the high concentrations of Cd2+ and Pb2+ in the soil at the depths of 1.0 and 2.5m are mainly from the electronic waste which constitute about 6% of the wastes in the landfill. The pH of the soil can be corrected using lime while that of the groundwater can be corrected using sodium bicarbonate ( Na2CO3); the high levels of SO2 and NO2 can be minimized by installing scrubbers at the landfill. The direct health impacts such as respiratory sickness arising from gaseous emissions (SO2, NO2, CH4,CO ) at the landfill can be reduced by relocating people who live very close to the landfill and preventing scavengers who do brisk business at the landfill. The gases can also be processed and treated to produce electricity, heat, fuels and various chemical components. However, the long term solution to the risk offered by the landfill is its replacement by a sanitary landfill.
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Enzyme Measurements Increases Understanding of Effects of Land Management Practices
A Hanslope Soil health was investigated from context of enzyme activities namely: cellulose, phosphomonoesterase and urease to enhance the understanding of the following land management practices: grassland under permanent pasture on 5 y ley to stocking, another sown with red clover a y before stocking, the other fertilized with N-fertilizer a y to stocking; the last on barley; with pristine deciduous woodland as control. The highest cellulose activity was detected in deciduous woodland, 172.3 ± 106 µg glucose g-1 d-1 over the summer. Cellulase activity was positively dependent on soil microbial C (R2 = 0.64). Grassland under permanent pasture treated with N-fertilizer a y before stocking had the highest urease activity, 77 ± 57.8 µg NH4-N g-1 h-1 over winter in both buffered and non buffered measurement techniques. There was no significant differences in phosphomonoesterase activity between land management. Soil enzyme measurements is a major component of soil health. It defines biological productivity, promote environmental quality and maintains plant and animal health. Soil health is fundamental for agricultural sustainability. Amongst the soil biological properties, enzymes show extraordinary specificity in catalyzing biological reactions as revealed in this study. Regional information are solicited for global network.
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Evaluation of pump storage power plant for Iranian power grid
Gradual development in power systems has caused so many problems in control and optimum using of electrical storage systems. Storing of electrical energy has made new capabilities in improving the current control methods. Quick access to these kinds of energies lets us direct control for supplying the consumers in electrical grid network. These methods are powerful to control and solve the current economical and technical problems of the compound and large power systems. On the other hand, using the various methods of direct energy storage can produce suitable capacity to store the electrical energy for the power industry. Among all of the energy storage systems, pumped storage power plants when they committed, because of their special characteristics, have a unique situation. In this paper, the feasibility assessment of the usage of pumped storage power plants for the Iranian grid has been discussed by WASP-IV program.
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Fatty acids composition, ?-glucosidase inhibitory potential and cytotoxicity activity of Oncoba spinosa Forssk
Oncoba spinosa is traditionally reputed for its medicinal potential particularly in southwestern part of Nigeria for the treatment of diabetes and cancer. 500 g of the leaves were extracted with 70 % aqueous ethanol and sequentially partitioned with hexane and chloroform. The various extracts were tested for the presence of secondary metabolites and subsequently screened for ?-glucosidase inhibitory, radical scavenging and cytotoxicity activities. Alkaliods, flavonoids, tannins, sterols, and anthraquinones were detected in various extracts while saponin was absent in all the extracts. The crude and aqueous extracts showed better activities than the standard antidiabetic drug (acarbose) in concentration dependent manner. The aqueous and chloroform extracts had antioxidant activities comparables to ascorbic acid at concentrations 125 and 250 µg/mL. The brine shrimps lethality assay indicated the cytotoxicity of the crude, chloroform and hexane extracts, this was further established using cervical (HeLa) and Lung (A549) cancer cell lines. The results support the folkloric use of the plant as antihyperglycemic and antineoplastic.
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Field evaluation of water uptake reduction functions under conjunctive salinity and water stress conditions (case study: wheat, ghods variety)
Plants often experience both drought and salinity stress in arid environment. Various mathematical water uptake models exist for plants response to combined drought and salinity stress. The reduction functions are classified as additive, multiplicative and conceptual models. In this study six different macroscopic reduction functions, namely; Van Genuchten (additive and multiplicative), Dirksen et al., Van Dam et al, Skaggs et al and Homaee were evaluated. The experiment was carried out on Ghods variety of wheat crop in a factorial split plot design with 3 replicates in the Research Field of university Birjand. The treatments consisted of four levels of irrigation (50, 75, 100 and 120%of crop water requirement), and three water qualities (1.4, 4.5, 9.6 dS/m). The results of this study indicated that the additive model estimates relative yield less than actual amount. In other word, the effect of combined stresses on wheat yield was less compared to sum of the separate effects due to salinity and water stress. The effect of drought stress on reduction of yield was more than salinity stress. The results also revealed that reduction function of Skaggs et al and Homaee were better fitness to measured data than the other functions.
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Gats and Indian higher education –opportunities and challenges
Education is an important stand-in for human development. Along with economic growth and empowerment, it forms the core of every social and human development doctrines. Higher education as we have today is outcome of a long socio-cultural growth. The General Agreement on Trade and Service (GATS) is among the World Trade Organization’s most important agreements. The creation of the accord was one of the landmark achievements of the Uruguay Round and is the first and only set of multilateral rules and commitments covering Government measures that effect international trade in services. However, during the last four decades, the state had made considerable progress in all the areas of development. In this paper accounting of major objectives, i) to study analyze the GATS and Indian Higher Education ii) identify present status of the Indian higher education iii) the examine the policy suggestion and summary. Study will cover of India and regional centers will make use of based on secondary data. The analysis of growth, regional variations, state assistance to determents factors like higher education impact on GATS will be based on secondary data collected from the Reports documents published by such other agencies, using CAGR. Hence the very success of economic reform policies critically depends upon the competence of the human capital and in particular the specialized human capital. In this paper an attempt has impact on GATS and Higher Education in India.
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Growth and characterization of aluminium nitrate doped sulphamic acid single crystal
The search for new NLO materials is a never ending process. Good quality Aluminium Nitrate doped Sulphamic Acid single crystals have been grown by slow evaporation technique. The unit cell parameters of the grown crystals were studied using single crystal XRD. The functional groups present in the grown crystal were identified by FTIR analysis. Optical behaviour of the grown crystal was investigated using UV-Vis-NIR studies. The thermal stability of the grown crystal was confirmed by Thermogravimetric analysis (TGA)/Differential thermogravimetric analysis (DTA).The mechanical strength and Nonlinear optical property of the crystal were determined by Vicker’s Microhardness Test and Kurtz powder technique respectively.Nonlinear optical property of the crystal were determined by Vicker’s Microhardness Test and Kurtz powder technique respectively.
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Hirshfeld surface, spectroscopic investigation (FT-IR, Raman and NMR), Reactive descriptor and docking study of Naphthalene-1-yl acetic acid
The Fourier transform infrared, FT-Raman and NMR spectra of Naphthalene-1-ly acetic acid (NAA) have been recorded and analyzed. Harmonic vibrational frequencies have been investigated with the help of Density functional theory (DFT) with 6-31+G(d, p) and 6-31++G(2d, 2p) basis sets. The Gauge-Invariant Atomic Orbital Approach (GIOA) is used to calculate the proton and carbon chemical shifts of the title compound. The natural bond orbital analysis of the title compound is also reported in order to understand the stability of the molecule which arises from hyper-conjucative intermolecular interactions and charge delocalization. The polarizability (?), first order hyper-polarizability (?) and second order hyper-polarizability (?) values of the investigated molecule have been computed using DFT quantum mechanical calculations. The molecular orbital contributions are studied by the density of energy states (DOSs). The reactivity sites are by mapping the electron density into the electrostatic potential surface (MEP). Mulliken analysis of atomic charges is also calculated. The electron density-based local reactivity descriptors such as Fukui functions were calculated to explain the chemical selectivity or reactivity site in NAA. Hirshfeld surface and fingerprint plots reveal that the complex structure is stabilized mainly by H…H, C…C, C…H intermolecular interactions. Finally, molecular docking studies have been carried out in the active site of NAA was also investigated.
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Implementing discrete wavelet transform and artificial neural networks for acoustic condition monitoring of gearbox
In present research, acoustic signals from gearbox of Massey Ferguson 285 are used for fault diagnosis of gears. Worn tooth face gear and broken tooth gear are studied as two common faults in gear-sets. Signal processing on acquired acoustic signals are done using wavelet transform. Decomposition is made using discrete wavelet transform (DWT) in four levels and using Db4 mother wavelet. Desired information from DWT decomposition is provided by applying some functions on DWT outputs. The investigated data set is fed into feed forward back-propagation neural network to classify the gears status. Two layer networks are trained and tested with separate data sets and using variable hidden layer neurons count. Results show that 100% performance is gained by a network with two neurons in hidden layer.
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Influence of age and locality on coping strategies among Iranian women
The present study is an attempt to assess the influence of age and locality on coping strategies among Iranian women in Esfahan Province. A total of 880 Iranian women randomly selected from Esfahan province for the present study. They were administered coping checklist , which measured coping strategies in healthy cognitive, social support, spiritual related, physical activity related, problem solving, unhealthy coping, and high risk coping. The results were analyzed through One-way ANOVA. Results revealed that in unhealthy coping habits, respondents below 20 years, 21-35 years and 51-65 years found to use more of unhealthy coping habits compared to other age groups. Further, significant differences between women from rural and urban areas in physical activity related, problem solving, and unhealthy cognitive strategies. Social work measures to improve the conditions of women in general have been discussed.
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