Journal of Environment and Safety
Online ISSN : 2186-3725
Print ISSN : 1884-4375
ISSN-L : 1884-4375
Research Papers
Treatment of bio-diesel fuel wastewater using aerobic thermophilic bacteria Bacillus licheniformis strain MU11
Koji YamanoReito WatanabeHotaka KaiMasahiro YamaguchiTakuji NakashimaKento ArakiYuka YakushijiKoji ArizonoYasuhiro Ishibashi
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2019 Volume 10 Issue 3 Pages 177-187


During the production of biodiesel fuel, wastewater containing about 10 to 20% of raw material oil such as glycerin,methanol, soap components and impurities such as unconverted fatty acids is generated. This wastewater can be treated by biological treatment such as activated sludge method, but there is no efficient treatment method. Therefore, in this study, we examined the optimum treatment conditions for the purpose of treating biodiesel fuel wastewater.

The biodiesel fuel wastewater contains water soluble components and oil and, is emulsified. It was confirmed that the addition of an acid was effective for the decomposition of this emulsion (emulsion break). And that the oil component was separated by the decomposition of the emulsion, then the COD of the aqueous layer could be reduced. Also,substances that are the main cause of organic pollution of biodiesel fuel wastewater after emulsion break are glycerin and methanol. Furthermore, it was shown that in the hybrid condition in which activated sludge and MU11 strain were mixed,the rate of decrease of CODMn was fast compared to other conditions. Finally, Hybrid conditions have been shown to be effective for the treatment of biodiesel fuel wastewater.

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© 2019 Academic Consociation of Environmental Safety and Waste Management,Japan
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