Application of the anammox-based process for nitrogen removal from anaerobic digestion effluent: A review of treatment performance, biochemical reactions, and impact factors

Li Sheng, Zhen Lei, Mawuli Dzakpasu, Yu You Li, Qian Li, Rong Chen

Research output: Contribution to journalReview articlepeer-review

Abstract

Anaerobic digestion (AD) combined with an anammox-based process is an efficient and energy-saving technology. The key to realizing the wide application of this technology is to deeply understand the anammox-based process, which is the limiting phase of this technology. This study provides an overview of more than 30 reactors from published studies on AD effluent treatment via anammox-based processes. The objective of this review is to evaluate how to achieve stability and high efficiency in the anammox-based process. Therefore, the AD effluent components are critically reviewed, and the appropriate pretreatment procedures for the AD effluent before it is fed into an anammox-based process reactor are summarized. Single-stage and two-stage partial nitration–anammox (PN/A) are two common anammox-based processes for removing autotrophic nitrogen from AD effluent. To reduce the nitrate produced by anammox, a combination of partial denitrification with PN/A is recommended. Nitrogen and carbon removal efficiencies are the basic criteria that are used to assess the performance of existing anammox-based processes for AD effluent treatment. Thus, the strategies for efficiently removing nitrogen and carbon in anammox-based processes are documented in this review. Moreover, the relationships between anammox, ammonium-oxidizing bacteria, nitrite-oxidizing bacteria, and denitrifiers are explored by clarifying the potential biochemical reactions in anammox-based processes for AD effluent treatment. Furthermore, the three primary influencing factors—ammonia and nitrite concentrations, organic concentration, and the operation parameters—are summarized.

Original languageEnglish
Article number101595
JournalJournal of Water Process Engineering
Volume38
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • Anaerobic digestion
  • Anammox
  • Nitrogen removal
  • Wastewater treatment

ASJC Scopus subject areas

  • Biotechnology
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Process Chemistry and Technology

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