Overall performance and microbial community analysis of a full-scale aerobic cold-rolling emulsion wastewater (CREW) treatment system

Meng Tang, Haoyu Wang, Yuneng Tang, Baiqian Dai, Xiwang Zhang, Zhikao Li, Enchao Li, Bingsheng Xu, Guo Yuan

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Cold-rolling emulsion wastewater (CREW) is an important type of wastewater generated from steel cold-rolling processes. In this study, for the first time, a full-scale aerobic bioreactor was studied to treat CREW. The consecutive 1-year field data showed that the average removal rate of total oil, TOC and COD reached 75.2%, 83% and 81%, respectively. The results of high-throughput sequencing demonstrated that the dominant phyla were Proteobacteria, Actinobacteria, Acidobacteria, and Bacteroidetes, consistent with other aerobic biochemical treatment systems in general, which ensured good adaptability of such bio-community to treat CREW. The average relative abundance of one dominant class, Alphaproteobacteria, was slightly higher than that of Betaproteobacteria, which is a unique phenomenon of the CREW treatment process and is different from most of the oil-containing wastewater processes. Combined with the GC×GC-TOF MS analysis of the influent and effluent, this phenomenon was hypothesized to be driven by the presence of phenols and was discussed in detail using the redundancy analysis, as well as the function and classification of dominant bacteria at genus level.

Original languageEnglish
Article number106272
Number of pages9
JournalJournal of Environmental Chemical Engineering
Issue number5
Publication statusPublished - Oct 2021


  • Aerobic bioreactor
  • Cold-rolling emulsion wastewater (CREW)
  • Full-scale
  • Microbial community
  • Phenols

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