[Show abstract][Hide abstract] ABSTRACT: Water samples from the Anambra River were taken from five distinct locations that displayed differential environmental stress to evaluate freshwater pollution. The physico-chemical characteristics of the river were conducted. The distribution and occurrence of heavy metals, which may affect human health and possibly induce aquatic damage, were investigated in the water column, adopting standard ecological and chemical techniques. The experimental approach was conducted under 2x5 factorial in a completely randomized block design using equal replicates to test the effects of season (rainy and dry) and location on the pollution parametric measurements, together with their interactions on heavy metal concentrations. Public survey on the use and treatment of water from the ecologically stressed river was investigated with questionnaire. Variations occurred between physico-chemical parameters and heavy metal concentrations of water samples from different locations in both rainy and dry seasons. Season by location interaction affected the heavy metal concentrations adversely, especially with regard to zinc. Likert scaling procedure further showed significant use and non-treatment of water from the river, posing a potential health threat to the dependent human population. Being obvious from the results that freshwater pollution could also be traceable to effluent/municipal wastewater discharged from industries and homes, there is need to respond appropriately to sustain the aquatic resources and avert possible human disease tragedies. In addition, Ackerman’s principles of water management for people and environment should be followed.
Journal of Life Science and Biomedicine. 07/2013; 3(4):308-317.
[Show abstract][Hide abstract] ABSTRACT: We investigated characteristics of crude oil-contaminated soils of a town within an oil-exploration zone of southeastern Nigeria in 2006. Target sampling technique was used in collecting soil samples, which were later prepared for various laboratory analyses. Cassava sludge was obtained from wastewater disposal pit and composted using Aerated Pile meth-od. Five temporal treatments, namely 30, 60, 90, 150 and 180 days were observed when 0.5 kg composed Cassava sludge was applied on 5-kg soil set up in a completely randomized design. Results showed differences in chemical composition of sludge and its compost. There were significant (P = 0.05) variation in the removability of priority pollutants using composted Cassava sludge: with greater efficacy at 120 and 180 days for total cadmium and nickel. Further studies should consider varying rates of this sludge and different soils since soils of the area are formed from dissimilar lithologies. [Life Science Journal. 2008; 5(3): 62 – 66] (ISSN: 1097 – 8135).
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