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American Journal of Innovative Research & Applied Sciences
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  | ARTICLES | Am. J. innov. res. appl. sci. Volume 5,  Issue 3, Pages 209-217 (September 2017)
Research Article
 
American Journal of innovative
Research & Applied Sciences 
ISSN  2429-5396 (Online)
OCLC Number: 920041286
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| SEPTEMBER | VOLUME 5 | N° 3 | 2017 |
Authors Contact

*Correspondant author and authors Copyright © 2017:

| Emmanuel Eyitayo Awokunmi | Olayinka Abidemi Ibigbami | Adefusisoye Adegalu Adebawore | and | Sunday Samuel Asaolu |
Affiliation.

| Ekiti State University | Department of Chemistry | Ado-Ekiti | Nigeria|
This article is made freely available as part of this journal's Open Access: ID | Emmanuel ManuscriptRef.3-ajira300117 |
THE ROLE OF SEWAGE SLUDGE APPLICATION ON THE HEAVY METALS CONCENTRATIONS OF SOIL OF AUTOMOBILES DUMPSITE

| Emmanuel Eyitayo Awokunmi | Olayinka Abidemi Ibigbami | Adefusisoye Adegalu Adebawore | and | Sunday Samuel Asaolu |.  Am. J. innov. res. appl. sci. 2017; 5(3):209-217.

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|Received | 30 January 2017|                 |Accepted | 19 February 2017|                   |Published 14 August 2017 |

ABSTRACT

Background: The physicochemical and levels of heavy metals of locations on automobile dumpsite located in Akure, Ondo State, Nigeria were investigated prior to the application of sewage sludge. Objectives: The effect of application of sewage sludge on the physicochemical parameters and heavy metals concentration was investigated to determine the suitability of the sewage sludge as amendment in contaminated soil reclamation. Materials and Methods: Physicochemical parameters such as pH, Organic Matter Content and Cation Exchange Capacity (CEC) were determined prior to application of amendment to soil, after which the distribution of heavy metals in various soil fragments were carried out on the amended and non-amended soil. Results: The mean values of pH, organic matter content and cation exchange capacity of soil of the two locations were 6.85, 12.45% and 16.65 Meq/100g respectively; the pH, organic matter and CEC increased with addition of sewage sludge to 7.4, 16.4% and 20.6 Meq/100g respectively. The mean concentrations (in mg/kg) of soil samples (1a and 2a) were 185, 170, 8.5, 127.5, 133.5, 75 and 1675 for Co, Cr, Pb, Zn, Cu, Ni and Fe respectively. The corresponding concentrations of heavy metals (in mg/kg) after the addition of amendment (1b and 2b) were 185.6, 171.5, 9.2, 128, 135.7, 78.25 and 1766.5 respectively. The concentration of water extractable heavy metals before and after amendment (top soils) ranged from (21.8 to 38.6); (16.1 to 15.1); (1.6 to 1.6); (26.2 to29.1); 36.4 to 38.4); (11.2 to 12.2); 48.2 to 48.9) for Co, Cr, Pb, Zn, Cu, Ni and Fe, and (22.0 to 38.2); (18.2 to 17.8); (1.8 to 1.7); (28.1 to 28.9); (36.2 to 38.4); (11.4 to 12.4) and (48.6 to 50.1) for bottom soil respectively. The heavy metals considered in this study were found in all extractive phases, with highest concentrations as bound to organic matter. Conclusion: The distribution of the heavy metals considered in this study at non-exchangeable phase of soil after application of amendment revealed that most of them may not be bio-available to plant and as a result a probable option for soil reclamation However, this strategy should be considered for field applications.

Keywords: Akure, physicochemical properties, heavy metals, sequential extraction, water extractable metal, soil contamination.