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Huan Jing Ke Xue. 2004 Sep;25(5):153-7.

[Isolation of heterotrophic microorganism and its role in bioleaching of heavy metals from tannery sludge].

[Article in Chinese]

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Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.


A heterotrophic microorganism was isolated from sewage sludge, it was identified as Rhodotorula sp. R30. Its optimum pH for growth was 3-7, but it can stand the acidity of pH 2.5-1.5. The optimum temperature was 28 degrees C. When R30 was inoculated in the medium containing dissolved organic matter derived from sewage sludge and incubated for 96 h, dissolved organic carbon in the medium declined from 1485 mg/L to 345 mg/L, and the yeast number was 4.8 x 10(7) mL(-1). It was found through the batch trial that the period of bioleaching could be apparently shorted to 4 days if R30 was inoculated in the bioleaching system. Furthermore, the removal efficiency of Cr in sewage sludge could be enhanced by 39% with compared to the control without inoculating R30.

[Indexed for MEDLINE]

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