ISSN 2375-1231
African Journal of Crop Science ISSN 2375-1231 Vol. 7 (11), pp. 001-007, November, 2019. © International Scholars Journals
Full Length Research Paper
Testing biological methods to treat rubber effluent
M. A. Iyagba1, A. Adoki2* and. T. G. Sokari1
1Department of Biological Sciences, Rivers State Univ of Science and Technology Port Harcourt, Nigeria.
2Shell Petroleum Development Co. Ltd, P. O. Box 263, Old Aba Road, Port Harcourt, Nigeria.
Accepted 22 May, 2019
Abstract
A study was conducted with the aim of treating and disposing of the effluent of an indigenous rubber company rich in PO43- and NH4+ and also determine the effect of the effluent on soil fertility. The basic method used for the biological treatment was aerobic digestion with glucose and magnesium amendments. Most naturally occurring aerobic heterotrophic bacteria in the rubber effluent were found to be capable of utilizing petroleum hydrocarbons as carbon and energy sources. Prominent among these bacteria were the genera of Micrococcus, Bacillus, Staphylococcus, Aerobacter, Proteus, Corynebacterium, Streptococcus, Aeromonas and Pseudomonas. The possibility of using the effluent as soil supplement was established. Oxidative digestion following amendment with glucose yielded only 53 and 40% reduction in levels of NH4+ and PO43- respectively. Addition of glucose and magnessium ions resulted in 95% reduction for NH4+ and 47% for PO43-, respectively. Our results indicate that rubber effluent can be disposed of (i) by controlled spread to agricultural soils as an fertilizing agent or (ii) by aerobic digestion before release in natural flowing waters.
Key words: Heterotrophic bacteria, rubber effluent, amendment, oxidative digestion.