Impact of nano zero valent iron on tetracycline degradation and microbial community succession during anaerobic digestion

Xiaofang Pan, Nan Lv, Chunxing Li, Jing Ning, Tao Wang, Ruming Wang, Mingdian Zhou, Gefu Zhu*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

12 Downloads (Pure)

Abstract

Supplementing nano zero valent iron (nZVI) is an attractive technology for wastewater treatment due to its advantages in accelerating the hydrolysis, fermentation and anaerobic digestion (AD) process. In this present study, nZVI was added to investigate its effects on enhancing tetracycline (TC) wastewater anaerobic treatment and the changes of microbial community, especially for underestimated syntrophic-methanogenic associations. The TC concentrations were 1, 10, 30, 50, 80, 100 and 150 mg/L with 0.38 g nZVI (with iron g/g VS of 0.50) complemented into reactors. Results revealed that nZVI could enhance AD process in both control and TC dosed systems, and the promoting effect on methanogenesis was more significant in systems of high concentration TC, with 100 and 150 mg/L. In addition, cumulative CH4 production for all TC added systems without nZVI were higher than the control indicating TC had positive effect instead of expected negative effect on AD process, high TC concentration of 100 and 150 mg/L only affecting the increase factor rather than causing inhibitory effect. After digestion, TC was largely removed in with/without nZVI systems. And also, nZVI evidently altered the bacterial and methanogenic community structure, with an increase abundance of syntrophic-methanogenic associations (Syntrophobacterales and Methanosarcinales) and resulting in the enhancement of methane generation. This research provides an efficient method for TC wastewater anaerobic treatment.
Original languageEnglish
JournalChemical Engineering Journal
Volume359
Pages (from-to)662-671
ISSN1369-703X
DOIs
Publication statusPublished - 2018

Keywords

  • Anaerobic digestion
  • Nano zero valent iron
  • TetracyclineMicrobial community
  • Syntrophic-methanogenic associations

Fingerprint Dive into the research topics of 'Impact of nano zero valent iron on tetracycline degradation and microbial community succession during anaerobic digestion'. Together they form a unique fingerprint.

Cite this