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Efficient flocculation pretreatment of coal gasification wastewater by halophilic bacterium Halovibrio variabilis TG-5

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Abstract

The isolated halophilic bacterial strain Halovibrio variabilis TG-5 showed a good performance in the pretreatment of coal gasification wastewater. With the optimum culture conditions of pH = 7, a temperature of 46 °C, and a salinity of 15%, the chemical oxygen demand and volatile phenol content of pretreated wastewater were decreased to 1721 mg/L and 94 mg/L, respectively. The removal rates of chemical oxygen demand and volatile phenol were over 90% and 70%, respectively. At the optimum salinity conditions of 15%, the total yield of intracellular compatible solutes and the extracellular transient released yield under hypotonic conditions were increased to 6.88 g/L and 3.45 g/L, respectively. The essential compatible solutes such as l-lysine, l-valine, and betaine were important in flocculation mechanism in wastewater pretreatment. This study provided a new method for pretreating coal gasification wastewater by halophilic microorganisms, and revealed the crucial roles of compatible solutes in the flocculation process.

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Data availability

All experimental data are available upon request.

Abbreviations

CGW:

Coal gasification wastewater

NH4 +–N:

Ammonia nitrogen

COD:

Chemical oxygen demand

TSS:

Total suspended solids

PCR:

Polymerase chain reaction

ML:

Maximum Likelihood

LC–MS:

Liquid chromatography–electrospray mass spectrometry

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Acknowledgements

The research was supported by the Foundation of Tianjin Science and Technology Committee Development Project (No. 21ZYQCSY00050) and Tianjin Key Laboratory Project of Brine Chemical Engineering and Resource Eco-utilization (No. BCERE201908).

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Contributions

XS: conceptualization, data curation, formal analysis, writing—original draft. GZ: investigation, writing—review and editing. YS: conceptualization, investigation, software. DZ: supervision, resources, data curation. LC: software, visualization.

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Correspondence to Daling Zhu.

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Communicated by Moracci.

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Sun, X., Zhang, G., Shi, Y. et al. Efficient flocculation pretreatment of coal gasification wastewater by halophilic bacterium Halovibrio variabilis TG-5. Extremophiles 28, 11 (2024). https://doi.org/10.1007/s00792-023-01328-w

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