Effect of influent pH on hydrolytic acidification performance and bacterial community structure in EGSB for pretreating crotonaldehyde manufacture wastewater after ozonation

Tao Liu, Zhiqiang Shen, Chunyu Zhang, Yudong Song, Jie Li, Zongpu Yang, Guangqing Song, Zhenfeng Han, Yuexi Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

The objective of this work was to evaluate the effect of influent pH on the hydrolytic acidification (HA) performance and microbial community structure in an expanded granular sludge bed (EGSB) pretreating crotonaldehyde manufacture wastewater (CMW) after ozonation. The results showed that higher chemical oxygen demand (COD) removal rate (40.1%) and acidification degree (27.6%) were obtained at pH 8.0 than those at pH 6.0 and pH 4.0. The concentration of extractable extracellular polymeric substance (EPS) in the sludge gradually decreased with the pH decreasing from 8.0 to 4.0. A similar change was also observed for the concentration of total volatile fatty acids (TVFA) in the effluent. The optimal detoxification efficiency by the HA process was obtained at pH 8.0, with higher removal efficiency (all higher than 90%) of the main toxic pollutants (crotonaldehyde, 5-formyl-6-methyl-4,5-dihydropyran, etc.) and higher anaerobic biodegradation rate (44.5%) in biochemical methane potential (BMP) assay. Among the predominant genera, the Acinetobacter and Pseudomonas were possibly related to biodegradation of pollutants, since their higher relative abundance also coincided with the better performance of the HA process at pH 8.0.

Original languageEnglish
Pages (from-to)1174-1183
Number of pages10
JournalWater Science and Technology
Volume79
Issue number6
DOIs
Publication statusPublished - 15 Mar 2019
Externally publishedYes

Keywords

  • Bacterial community structure
  • Crotonaldehyde manufacture wastewater
  • Detoxification
  • Hydrolytic acidification
  • PH

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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