November 2009
Technology-Assisted Environmentally-Sustainable Food Production
November 2009
Trace elements contamination of soils around gold mine tailings dams at Obuasi, Ghana
This study investigated the issue of tailings dams as a potential source of trace elements contamination in soils at the Obuasi gold mine in Ghana. Soil samples taken from depths of up to 12 cm and within a radius of 400 m from the tailings dams (active and decommissioned), were analysed for As, Cu, Pb and Zn using atomic absorption spectrometry. Average concentrations of As,...
November 2009
Comparative analysis of the efficiencies of two low cost adsorbents in the removal of Cr(VI) and Ni(II) from aqueous solution
Heavy metals present in waste waters which are released into the environment by various industries have become a serious problem. This research is focused on the comparison of two agricultural wastes in the removal of Ni(II) and Cr(VI) ions from aqueous solution and the effect of HCl modification. The effects of adsorbent dose, initial concentration, contact time, pH and temperature on adsorption were investigated....
November 2009
Estimation of lead in urine of school children in south western Nigeria and effect of ascorbic intervention
This study was carried out to investigate the level of lead in the air and urine of pupils in selected schools in south western Nigeria and ascertain the effect of ascorbic acid, with a view to providing baseline data on lead levels in children. A total of 197 pupils in schools in urban and rural communities of Ife Central Local Government, Osun State in the south west of Nigeria (that is Sabo, Iremo and...
November 2009
Evaluating the fate of organic compounds in the Cameroon environment using a level III multimedia fugacity model
A level III fugacity model was developed to evaluate the fate of chemicals in the Cameroon environment. The model required as input physical-chemical properties, mode and amount of chemical released and environmental characteristics. These were used to predict the distribution of the chemical in the environment, quantify intermedia transfer processes and the major loss mechanisms from the environmental compartments....
November 2009
Modification in the design of an already existing palm nut - fibre separator
The modified palm nut-fibre separator machine comprises of a feed hopper, a separating chamber with an upper shaft carrying beaters which act as both conveyor and cake breaker and a lower shaft with sharp edged spiral worm and four fixed blades, a pair of adjustable blades, a prime mover (a 7.5 Hp electric motor of 1900 rpm, or its equivalent IC engine) and inlet and outlet funnels for nuts and fibres...
November 2009
Equilibrium studies on sorption of an anionic dye onto acid activated water hyacinth roots
The inappropriate disposal of dyes in wastewater constitutes an environmental problem and can cause damage to the ecosystem. Present investigation deals with the utilization of water hyacinth roots (collected from the ponds) as adsorbent for the removal of anionic dye from its aqueous solutions. Batch studies were conducted to evaluate the adsorption capacity of the dye, Congo red on the sorbent with respect...
November 2009
Incidence of organochlorine insecticides (DDT and heptachlor) in Bangladeshi dry fish: seasonal trends and species variability
The concentrations of organochlorine insecticides dichlorodiphenyltrichloroethane(DDT) and heptachlor were investigated to estimate the current status of insecticides used in dry fish in different season and different species. Six most popular species of dry fishes namely Bombay duck (Loittya), Ribbon fish (Chhuri), Shrimp (Chingri), Hilsha shed (Ilish), Chinese pomfret (Rupchanda) and Indian salmon...
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