Strategies for improving nitrogen removal under high sludge loading rate in an anammox membrane bioreactor operated at 25 °C

Shaohua Sun, Ying Song, Xiao Jin Yang, Hanjun Hu, Shangze Wu, Wei kang Qi, Yu You Li

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

An anaerobic ammonium oxidation (anammox) membrane bioreactor operated at 25 °C was used to investigate nitrogen removal under different operation conditions, namely, different sludge retention time (SRT) and nitrogen loading rate (NLR). The inhibition processes caused by high substance concentrations and over-loading were able to be circumvented by various adjustment methods. Furthermore, specific anammox activity (SAA) tests were performed to evaluate the effects of ammonium and nitrite on the anammox sludge. Over an SRT of 500 d, the content of volatile suspended solids (VSS) gradually increased from 125 mg/L to 5590 mg/L, and the maximum nitrogen removal rate (NRR) reached 1.18 kg N/m3/d. When the SRT was decreased to 50 d, the sludge concentration declined gradually, which necessitated an increase in the sludge loading rate (SLR), and the maximum sludge nitrogen removal rate (SNRR) of 0.67 g total nitrogen (TN)/g VSS/d was achieved at this time.

Original languageEnglish
Pages (from-to)106-114
Number of pages9
JournalChemical Engineering Science
Volume183
DOIs
Publication statusPublished - 2018 Jun 29

Keywords

  • Anaerobic ammonium oxidation
  • High sludge loading rate
  • Membrane bioreactor
  • Nitrogen removal

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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