Iron foam coupled hydrolysis acidification for trichloroacetaldehyde treatment: Strengthening characteristics and mechanism

• Published in: Bioresource technology Vol. 342; p. 126047
• Main Authors: Tian, Xiangmiao, Jin, Xiaoguang, Wang, Jie, Shen, Zhiqiang, Zhou, Yuexi, Wang, Kaijun
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.12.2021
• Subjects: Aldehyde removal; Chloral Hydrate - analogs & derivatives; Extracellular Polymeric Substance Matrix; Hydrogen-Ion Concentration; Hydrolysis; Hydrolysis acidification; Iron; Iron foam; Reductive dechlorination; Trichloroacetaldehyde; Iron foam; Aldehyde removal; Trichloroacetaldehyde; Hydrolysis acidification; Reductive dechlorination
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2021.126047

[Display omitted] •Coupled system achieved better dechlorination and aldehyde removal of TCAL.•The synergistic effect of iron foam and sludge improved the removal of TCAL.•Iron foam improved microbial activity enhancing the removal of TCAL by HA.•Iron foam passivation reduced and oxidation enhanced resulted from sludge effects. This research studied transformative characteristics and enhanced mechanism of trichloroacetaldehyde (TCAL), one of chlorinated acetaldehydes (CAAs), by coupled-type iron foam enhanced hydrolysis acidification (HA) reactor. Main results were given that better dechlorination and aldehyde removal were achieved at this process than coupled-type iron foam enhanced HA, alone iron foam and HA reactor. The reasons were due to better strengthening effects of iron foam and HA, iron foam reduced TCAL toxicity to microbes caused an improvement of microbial activity, therefore, volatile fatty acids (VFAs) content and acetate acid (Ac) ratio were increased compared with HA. Moreover, it promoted the enrichment of Actinobacteriota and Firmicutes, and more extracellular polymeric substance (EPS) and enzymes enhanced dechlorination and aldehyde removal. Certainly, microbes reduced iron foam passivation and facilitated its oxidation further improved the strengthening effect.