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Biodegradation Potential of Some Bacteria and Fungi Isolates from Septic Tank Sewage in Some Related Sites in Delta and Edo States of Nigeria

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Document pages: 12 pages

Abstract: The biodegradation potentials of some selectedbacteria isolated from septic tank sewage in the region under study were examined. Three replicate samples fromLocations A, B and C representing Agbor, Benin and Sapele regions of Delta andEdo States, Nigeria respectively were collected from the influent tank (rawsewage) between November 2018 and January 2019 for testing. The sewage in 10 mlseptic tubes for both experimental and control samples was subjected to shakeflask biodegradation analysis using the isolates with the highest screen testresult. A total of 18 bio-treatment options were available in this study. Inthe shake flask biodegradation of sewage using isolates, total organic carbon (TOC)values from day 0 to 25 in all isolates were lower compared with the controlexperiments. TOC values at day 25 were lowest (0.10 mg L) in the treatment containing Bacillus sp. + Klebsiella sp. as compared to the TOCvalue (2.01 mg L) of the treatment which had Aeromonas sp. + Bacillus sp. + Klebsiella sp. pH, EC, COD, TDS, DO and BOD were also monitored for a period of 3 weeks. In all treatment options, therewas a rapid increase in the BOD for the experimental set up around day 10 - 20which ranged between 74.82 - 187.54 mg L. The overall physical observation (odour, consistency and colour) of theexperimental and the control septic tubes showed very high remarkablereductions in the experimental set-up when compared with the observation madefor the control samples.

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