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Up-flow anaerobic column reactor for sulfate-rich cadmium-bearing wastewater purification: system performance, removal mechanism and microbial community structure

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Abstract

This study constructed an up-flow anaerobic column reactor fed with synthetic sulfate-rich cadmium (Cd(II))-bearing wastewater, for investigating its Cd(II) removal performance and mechanism. Long-term experiment results manifest that introducing Cd(II) into influent led to an enhanced sulfate removal but did not increase the effluent sulfide concentration, implying the CdS formation. When influent Cd(II) concentration was shifted from 50 to 100 mg/L, the median Cd(II) removal rate was increased from 13.6 to 32.2 mg/(L·d). Batch tests indicate that the uptake and sequestration function of anaerobes merely led to a small portion of Cd(II) removal. A majority of aqueous Cd(II) (86.3%) was eliminated by precipitation reactions. The generated precipitates were found to be dominantly presented in carbonate, Fe–Mn oxide, sulfide bound and residue forms, which account for 92.6–93.9% of total Cd content of sludge obtained at diverse operation phases. The crystallographic CdS (i.e., residue fraction) particles have nano-scale sizes, and the relatively high atomic ratio of S to Cd was likely due to the adsorption/deposition of other sulfides. The dominant sulfate-reducing bacteria (SRB) were recognized as Desulfurella, Desulforhabdus and Desulfovibrio, and the primary competitor with them for substrate utilization were identified to be methanogens.

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Acknowledgements

We thank the financial support from the National Natural Science Foundation of China (52000046; 52060004), Special Project of Guangxi Science and Technology Base and Talent (GuiKe AD20297009; GuiKe AD20297007), Middle-aged and Young Teachers' Basic Ability Promotion Project of Guangxi (2020KY05039; 2021KY0221).

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All authors contributed to the study conception and design. Conceptualization, YJ and XZ; Data curation, JZ and QW; Funding acquisition, YJ, JZ and YZ; Investigation, JZ and YW; Methodology, JZ, QW and YQ; Project administration, YJ, JZ and YZ; Resources, YJ and XZ; Supervision, XZ; Visualization, YZ; Writing—original draft, YZ; writing—review and editing, JZ. All authors read and approved the final manuscript.

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Correspondence to Junjian Zheng or Yuanyuan Zhang.

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Jiang, Y., Zhang, J., Wen, Q. et al. Up-flow anaerobic column reactor for sulfate-rich cadmium-bearing wastewater purification: system performance, removal mechanism and microbial community structure. Biodegradation 33, 239–253 (2022). https://doi.org/10.1007/s10532-022-09983-0

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  • DOI: https://doi.org/10.1007/s10532-022-09983-0

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