Tag: nigeria

Recent Articles-IJES

Evaluation of the effect of legislation on wildlife conservation: A case study of Kainji lake National park, Kainji, Niger State, Nigeria
Author(s)- Idowu O.S, Halidu S.K, Odebiyi A.R

ABSTRACT

This study is conducted on the evaluation of the effect of conservation on wildlife offences in Kainji Lake National Park, Niger State was carried out in a period of four years since 2005-2009. Both primary and secondary collected data were analyzed and the results revealed that illegal grazing was the highest offence, recording 56.8%. Also, 15.5% were acquitted and 84.9% convicted and 16.1% went to jail and as high as 68.8% were able to pay fine during the period. Majority of the nights guards claimed that allowances were not paid and that staff were not accommodated properly and this has reduced the level of performance to their duties.

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Recent Articles-IJES

Biodecolourisation of textile dyes by local microbial consortia isolated from dye polluted soils in ngaoundere (Cameroon)
Author(s)- Ngwasiri Pride Ndasi, Mbawala Augustin, Tchatchueng Jean Bosco

ABSTRACT

Azo dyes are xenobiotic and recalcitrant against biodegradation, causing environmental problems. Under certain environmental conditions, microorganisms can transform dyes to non-coloured products or completely mineralize them. In the present study, the first attempt on dye decolourisation potentials of local microbial consortia isolated from dye contaminated soils in Ngaoundere-Cameroon were determined against two azo dyes. Decolourisation rate and kinetics were monitored by spectrophotometry under different conditions. Effect of process parameters: pH, dye concentration and inoculums size on dye decolourisation rate was optimised using the full factorial design. Microbial growth and decolourisation rate were higher in shaking than static conditions. The bacteria consortium gave highest decolourisation of 91.86% for azo blue and 93.75% for azo orange within 48 hours in shaking cultures; 57.78% and 62.06% respectively after 48 hours under static condition, followed by the mixed and fungi consortium. Kinetics studies revealed the bacteria consortia had highest tendency towards decolourisation, with a greater half live value for azo blue (13.97 hours) than for azo orange (10 hours). pH out of the range 7.2-8 and dye concentrations above 100mg/l reduced decolourisation rate by the bacteria consortia while increasing inoculums size increased it. Optimum decolourisation was achieved when pH and dye concentrations were kept low while the inoculums size was high.

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Recent Articles-IJES

Distribution of Heavy Metals in Sediments of Selected Streams in Ibadan Metropolis, Nigeria
Author(s)- Ladigbolu, I.A, Balogun, K.J

ABSTRACT

The concentration of Zinc (Zn), Copper (Cu), Nickel (Ni), Cadmium (Cd), Lead (Pb), Chromium (Cr) and Colbalt (Co) were determined in the five major streams sediment of Ibadan city; Odo-ona (S-1),Ogunpa (S-2),Ogbere (S-3),Kudeti (S-4) and Gege (S-5) to investigate consequences of population growth, urbanization, agricultural activities and uncontrolled direct dumping of wastes and sewages into aquatic environment. The order of the concentration of most of these studied metals in all the streams sediments were found to be Gege>Ogunpa>Kudeti>Ogbere>Odo-ona. This is clear indication of effect of population growth, urbanization, agricultural activities, traffic congestion of Automobile and indiscriminate dumping of domestic waste and sewage into the aquatic environment.
The highest mean total concentration of all studied trace metals Zn (429.1μg/g), Cu(249.5μg/g), Ni(15.30μg/g), Cd(2.02μg/g), Pb(405.0μg/g), and Cr(67.4μg/g) were observed in  Gege stream sediment(S-5) while that of Co was observed in Ogunpa  stream sediment(S-2).There was no significant difference (p>0.01) in the distribution of  Zn, Cr and Co in all the streams studied but significant difference (p<0.01) were observed in the distribution of Cu, Ni, Cd and Pb in all the streams sediment studied. Heavy metal concentration for all studied sediments showed a high level of pollution in comparism to GESAMP, 1982, Solomon and Forstner, 1984 and Prater and Anderson, 1977

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