Title

Bioaugmentation for improving the activated sludge process of treating refinery spent caustic: laboratory and field pilot-scale studies

RIS ID

105156

Publication Details

Sun, S., Fang, L., Song, Z., Wang, X., Wang, J., Luo, Y., Zhang, Z., Zhang, G., Jiang, Q. & Zhang, Z. (2016). Bioaugmentation for improving the activated sludge process of treating refinery spent caustic: laboratory and field pilot-scale studies. Desalination and Water Treatment, Online First 1-8.

Abstract

In this work, successful treatment of refinery spent-sulfidic caustic was achieved in activated sludge system bioaugmented with three specific bacterial strains (including Bacillus thuringiensis, Bacillus cereus, and Acidovorax ebreus) at both laboratory and pilot scale. After 18-fold dilution by volume, the diluted wastewater was treated aerobically. The volumetric loading rate of chemical oxygen demand (COD) was studied by treating variously diluted samples of high-strength wastewater (COD 3,100-3,600 mg/L). The results obtained with the raw wastewater were remarkably good, with an average COD removal of around 80%. The addition of peptone and trace elements improved the performance of the process. The mixed liquor suspended solids (MLSS) concentration in the reactors could be increased from the 2,500-3,000 mg/L MLSS level of general activated sludge processes to 6,000-8,000 mg/L after installation of draft tubes. These results showed that activated sludge process may be a powerful tool for treating refinery spent caustic by bioaugmentation and nutrient amendment.

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Link to publisher version (DOI)

http://dx.doi.org/10.1080/19443994.2015.1134354