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Relationship between microbial community dynamics and process performance during thermophilic sludge bioleaching

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Abstract

Heavy metals can be removed from the sludge using bioleaching technologies at thermophilic condition, thereby providing an option for biotreatment of wasted sludge generated from wastewater treatment. The purposes of this study were to establish a molecular biology technique, real-time PCR, for the detection and enumeration of the sulfur-oxidizing bacteria during the thermophilic sludge bioleaching. The 16S rRNA gene for real-time PCR quantification targeted the bioleaching bacteria: Sulfobacillus thermosulfidooxidans, Sulfobacillus acidophilus, and Acidithiobacillus caldus. The specificity and stringency for thermophilic sulfur-oxidizing bacteria were tested before the experiments of monitoring the bacterial community, bacterial number during the thermophilic sludge bioleaching and the future application on testing various environmental samples. The results showed that S. acidophilus was identified as the dominant sulfur-oxidizing bacteria, while A. caldus and S. thermosulfidooxidans occurred in relatively low numbers. The total number of the sulfur-oxidizing bacteria increased during the thermophilic bioleaching process. Meanwhile, the decrease of pH, production of sulfate, degradation of SS/VSS, and solubilization of heavy metal were found to correlate well with the population of thermophilic sulfur-oxidizing bacteria during the bioleaching process. The real-time PCR used in this study is a suitable method to monitor numbers of thermophilic sulfur-oxidizing bacteria during the bioleaching process.

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Acknowledgments

The work described in this paper was fully supported by a Grant in Aid from the Ministry of Science and Technology, Executive Yuan, Taiwan (NSC 100-2622-E-327-018-CC3).

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  1. Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, 2 Jhuoyue Road, Nanzih, Kaohsiung, 811, Taiwan

    Shen-Yi Chen & Li-Chieh Chou

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  1. Shen-Yi Chen
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  2. Li-Chieh Chou
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Correspondence to Shen-Yi Chen.

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Chen, SY., Chou, LC. Relationship between microbial community dynamics and process performance during thermophilic sludge bioleaching. Environ Sci Pollut Res 23, 16006–16014 (2016). https://doi.org/10.1007/s11356-016-6716-z

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  • DOI: https://doi.org/10.1007/s11356-016-6716-z

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