Treatment of heavy oil wastewater by UASB-BAFs using the combination of yeast and bacteria

Environmental Technology
Xiao-Ling Zou

Abstract

A novel system integrating an upflow anaerobic sludge blanket (UASB) reactor and a two-stage biological aerated filter (BAF) system was investigated as advanced treatment of heavy oil wastewater with large amounts of dissolved recalcitrant organic substances and low levels of nitrogen and phosphorus nutrients. #1 BAF, inoculated with two yeast strains (Candida tropicalis and Rhodotorula dairenensis), was installed in the upper reaches of #2 BAF inoculated with activated sludge. During the 180-day study period, the chemical oxygen demand (COD), ammonia nitrogen (NH3-N), oil and polyaromatic hydrocarbons (PAHs) in the wastewater were removed by 90.2%, 90.8%, 86.5% and 89.4%, respectively. Although the wastewater qualities fluctuated and the hydraulic retention time continuously decreased, the effluent quality index met the national discharge standard steadily. The UASB process greatly improved the biodegradability of the wastewater, while #1 BAF played an important role not only in degrading COD but also in removing oil and high molecular weight PAHs. This work demonstrates that the hybrid UASB-BAFs system containing yeast-bacteria consortium has the potential to be used in bioremediation of high-strength oily wastewater.

References

Oct 5, 2010·Bioresource Technology·Ceněk NovotnýWerner Fuchs
Apr 27, 2012·Environmental Science and Pollution Research International·Abd El-Latif HeshamMin Yang
Sep 4, 2012·Bioresource Technology·Antonella AnastasiGiovanna Cristina Varese
May 10, 2013·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Mang LuWen-Hao Xu
Apr 1, 2014·Environmental Science and Pollution Research International·Ranjit Das, Sufia K Kazy

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Citations

Oct 1, 2021·Environmental Technology·Wei LiHe Wang

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Methods Mentioned

BETA
infrared

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