3 years ago

Effect of zero-valent iron and trivalent iron on UASB rapid start-up

Wenbin Liu, Hongyan Fang, Guang Yang, Hui Jia, Jie Wang, Fei Gao

Abstract

In order to realize the rapid start-up of upflow anaerobic sludge blanket (UASB) reactor, the iron ion in different valence state was added to UASB. The results indicated that the start-up time of R3 (FeCl3) was 48 h faster than that of R2 (zero-valent iron (ZVI)). It was because the FeCl3 could rapidly promote granulation of sludge as a flocculant. However, ZVI released Fe2+ through corrosion slowly, and then the Fe2+ increased start-up speed by enhancing enzyme activity and enriching methanogens. In addition, the ZVI and FeCl3 could promote hydrolysis acidification and strengthen the decomposition of long-chain fatty acids. The detection of iron ions showed that iron ions mainly existed in the sludge. Because the high concentration of Fe2+ could inhibit anaerobic bacteria activity, excess Fe3+ could be changed into iron hydroxide precipitation to hinder the mass transfer process of anaerobic bacteria under the alkaline condition. The FeCl3 was suitable to be added at the initial stage of UASB start-up, and the ZVI was more fitted to be used in the middle stage of reactor start-up to improve the redox ability.

Publisher URL: https://link.springer.com/article/10.1007/s11356-017-0457-5

DOI: 10.1007/s11356-017-0457-5

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.