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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 21, No. 6, 2017, pp. 1029-1034
Bioline Code: ja17120
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 21, No. 6, 2017, pp. 1029-1034

 en Biodegradation Potentials of Cassava Mill Effluent (CME) by Indigenous Microorganisms
ENERIJIOFI, KE; EKHAISE, FO & EKOMABASI, IE

Abstract

The indiscriminate discharge of Cassava mill effluent pose serious environmental and public health implications. This work was aimed at assessing the biodegradation potentials of indigenous microbial isolates from cassava mill effluent using screening and shake flask degradation tests. The mean heterotrophic bacterial and fungal counts were 3.4±0.26 x 106cfu/ml and 1.1±0.20 x 106cfu/ml respectively. The microorganisms isolated, characterized and identified include the genus Pseudomonas check for this species in other resources (15.48%), Bacillus check for this species in other resources (12.41%), Acetobacter check for this species in other resources and Rhizopus check for this species in other resources (10.88%), Corynebacterium check for this species in other resources (9.33%), Lactobacillus check for this species in other resources , Micrococcus check for this species in other resources and Aspergillus check for this species in other resources (7.79%), Staphylococcus check for this species in other resources and Penicillium check for this species in other resources (6.25%) and Saccharomyces check for this species in other resources species (4.62%). The pH (5.39 ± 0.14), electrical conductivity (2506.90 ± 45.35), sulphate (210.87 ± 5.31), nitrate (365.28 ± 3.61), phosphate (107.70 ± 2.10), cyanide (19.93 ± 0.25), chemical oxygen demand (1728.33 ± 19.66), biological oxygen demand (1141.51 ± 12.69), iron (206.43±2.05), zinc (54.56 ± 0.62), manganese (19.96 ± 0.35), copper (10.67 ± 0.10) and nickel (3.28 ± 0.46) in mg/l were above the Federal Environmental Protection Agency standard for effluent discharge. Bacillus, Pseudomonas, Aspergillus and Penicillium species which had the highest turbidity were used for bioremediation studies. The consortium of microorganisms demonstrated the highest efficacy. Bioremediation of cassava mill effluent by these microorganisms was manifested in the reduction of biological oxygen demand (consortium of Pseudomonas and Bacillus species 97.42%), (Aspergillus and Penicillium species 75.32%) and chemical oxygen demand (Pseudomonas and Bacillus species 37.63%), (Aspergillus and Penicillium species 44.97%). The study has shown that microbial isolates have the potentials of reducing pollution effect thereby enhancing management of cassava mill effluent before eventual discharge into the environment.

Keywords
Biodegradation; Environmental management; Microorganisms; Turbidity; Cassava mill effluent; Ebelle.

 
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