A 20-Year Journey of Partial Nitritation and Anammox (PN/A) : From Sidestream toward Mainstream

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

113 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)7522-7531
Journal / PublicationEnvironmental Science and Technology
Volume56
Issue number12
Online published21 Jun 2022
Publication statusPublished - 21 Jun 2022
Externally publishedYes

Abstract

Anaerobic ammonium oxidation (anammox) was discovered as a new microbial reaction in the late 1990s, which led to the development of an innovative energy- and carbon-efficient technology-partial nitritation and anammox (PN/A)-for nitrogen removal. PN/A was first applied to remove the nitrogen from high-strength wastewaters, e.g., anaerobic digestion liquor (i.e., sidestream), and further expanded to the main line of wastewater treatment plants (i.e., mainstream). While sidestream PN/A has been well-established with extensive full-scale installations worldwide, practical application of PN/A in mainstream treatment has been proven extremely challenging to date. A key challenge is achieving stable suppression of nitrite-oxidizing bacteria (NOB). This study examines the progress of NOB suppression in both sidestream- and mainstream PN/A over the past two decades. The successful NOB suppression in sidestream PN/A was reviewed, and these successes were evaluated in terms of their transferability into mainstream PN/A. Drawing on the learning over the past decades, we anticipate that a hybrid process, comprised of biofilm and floccular sludge, bears great potential to achieve efficient mainstream PN/A, while a combination of strategies is entailed for stable NOB suppression. Furthermore, the recent discovery of novel nitrifiers would trigger new opportunities and new challenges for mainstream PN/A. © 2022 American Chemical Society.

Research Area(s)

  • Anammox, Mainstream, NOB suppression, Partial nitritation, Sidestream

Citation Format(s)

A 20-Year Journey of Partial Nitritation and Anammox (PN/A): From Sidestream toward Mainstream. / Wang, Zhiyao; Zheng, Min; Duan, Haoran et al.
In: Environmental Science and Technology, Vol. 56, No. 12, 21.06.2022, p. 7522-7531.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review