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

Read full text

Recent Articles-IJES

Effect of Heavy metals on Morphological and Biochemical characteristics of Albizia procera (Roxb.) Benth. Seedlings
Author(s) – Preeti Pandey, Tripathi.A.K

ABSTRACT

An investigation was conducted to study the differential action of heavy metals such as Cd, As and Pb on morphological and biochemical parameters of Albizia procera. These heavy metals at all concentration (1, 5 and 10 ppm) exhibited significant reduction in chlorophyll, crude protein, amino acid and soluble sugar quantity in leaves. These biochemical parameters showed a positive correlation with leaf area, root length, shoot length and biomass of the plant,.Polyphenol, proline and ascorbic acid of leaves significantly increased over control but revealed negative correlation with root-shoot length, leaf area and biomass of plant at all treatment levels. Concentration dependent changes were observed in most of the parameters. Hence, the morphological and biochemical traits may serve to determine suitable bio-indicators of heavy metal pollution and also for the classification of the species as tolerant or sensitive to heavy metals.

Read full text

Recent Articles- IJES

Experimental studies on effect of Heavy Metals presence in Industrial Wastewater on Biological Treatment
Author(s)- Majid Sa’idi

ABSTRACT

Biological Wastewater Treatment is one of the most important parts of wastewater treatment and microorganism has importance role in biological treatment. Microorganisms effect in metabolism of various organic compounds and other elements. Such microbiological parameters as the number, weight and activity of microorganisms can be good indicators of wastewater contamination with heavy metals. Heavy metals are known as harmful pollutants in Wastewater having a negative effect on Biological Wastewater Treatment plant including microorganisms. Some heavy metals, e.g. lead, even at low levels are toxic for microorganisms. As a rule, heavy metal has a negative effect on the growth of water microorganisms as it can greatly depress their numbers.  On one hand, the number of microorganisms depends on the total content and concentrations of particular forms of heavy metals. On the other hand, it is conditioned by several other factors, quantity and quality of organic matter, especially carbohydrate rich organic matter, pH, total exchange capacity, nutrient availability, moisture, temperature and oxygen availability. Heavy metals shift the structure of microbial populations, impoverish their diversity, and affect species composition, reproduction and activity of indigenous microorganisms. Contamination of wastewater with high rates of heavy metals caused a significant decrease in the numbers of bacteria in biological system. It is obvious that heavy metals are very danger contaminant in wastewater and disorder of biological wastewater treatment is as a result of this pollution.

Read full text