African Journal of Agricultural Research Vol. 2(12), pp. 656-662, December, 2007

ISSN 1991- 637X­© 2007 Academic Journals

Full Length Research Paper

The environmental impact of palm oil mill effluent (pome) on some physico-chemical parameters and total aerobic bioload of soil at

a dump site in Anyigba, Kogi State, Nigeria

Okwute, Loretta Ojonoma^* and Isu, Nnennaya R.

Department of Biological Sciences, University of Abuja, Abuja, Nigeria.

*Corresponding author. E-mail: lolookwute@yahoo.com.

Phone: +2348065261042

Accepted 22 October, 2007

The effect of POME on the integrity of the soil was investigated. Soil samples from the palm oil mill effluent (POME) dumpsite as well as a non-POME site were tested for physico-chemical properties such as pH, water holding capacity, available phosphorus, organic carbon, total nitrogen, mineral assay and cation exchange capacity. Furthermore, the total aerobic bacteria counts of the samples at 2, 30 and 40^oC were assayed.  Results showed significant differences (P < 0.05) and (P < 0.01) in pH, water holding capacity, organic carbon, total nitrogen, cation exchange capacity and available phosphorus. 30^oC had the highest average microbial bioload (1.64 x 10⁹ ± 0.2) and so, the most favourable for growth. Bacterial counts from the POME dumpsite were found to be significantly higher (P < 0.05), (9.6 x 10⁸ + 0.1 at 20^oC, 1.64 x 10⁹ + 0.2 at 30^oC and 1.07 x 10⁹ + 0.2 at 40^oC) than the counts for the non-POME soil sites (4.5 x 10⁸ + 0.3 at 20^oC, 7.6 x 10⁸ + 0.3 at 30^oC and 5.9 x 10⁸ + 0.3 at 40^oC) at all the temperatures. The implications of these results on soil environment are discussed.

Key words: Environmental impact, POME, total aerobic bacteria.