4.7 Article

Performance and microbial community dynamics relationship within a step-feed anoxic/oxic/anoxic/oxic process (SF-A/O/A/O) for coking wastewater treatment

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SCIENCE OF THE TOTAL ENVIRONMENT
卷 792, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.scitotenv.2021.148263

关键词

Coking wastewater; Step-feeding; Total nitrogen (TN); Polycyclic aromatic hydrocarbons (PAHs); Microbial characteristics

资金

  1. Beijing Outstanding Young Scientist Program [C19H100010]
  2. National Natural Science Foundation of China [51908029]

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The SF-A/OA/O process has demonstrated superior performance in full-scale coking wastewater treatment compared to the A/O/O process, showing efficient removal of COD, NH4+-N, TN, phenols, and cyanide. The abundance and structure of the microbial community may be key factors contributing to the strong stability of the SF-A/OA/O system.
A step-feed anoxic/oxic/anoxic/oxic (SF-A/O/A/O) was developed and successfully applied to full-scale coking wastewater treatment. The performance and microbial community were evaluated and systematically compared with the anoxic/oxic/oxic (A/O/O) process. SF-A/OA/O process exhibited efficient removal of COD, NH4+-N, TN, phenols, and cyanide with corresponding average effluent concentrations of 317.9, 1.8, 46.2, 1.1, and 0.2 mg.L-1, respectively. In particular, the TN removal efficiency of A/O/O process was only 7.8%, with an effluent concentration of 300.6 mg.L-1. Furthermore, polycyclic aromatic hydrocarbons with high molecular weight were the dominant compounds in raw coking wastewater, which were degraded to a greater extent in SF-A/OA/O. The abundance in Thiobacillus, SM1A02, and Thauera could be the main reason why SF-A/O/A/O was superior to A/O/O in treating TN. The microbial community structure of SF-A/O/A/O was similar among stages in system (P >= 0.05, Welch's t-test) and was less affected by environmental factors, which may have been one of the important factors in the system's strong stability. (C) 2021 Published by Elsevier B.V.

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