Achieving robust mainstream nitrite shunt at pilot-scale with integrated sidestream sludge treatment and step-feed

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

11 Scopus Citations
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Author(s)

  • Haoran Duan
  • Shane Watts
  • Min Zheng
  • Zhiyao Wang
  • Jing Zhao
  • Huijuan Li
  • Peng Liu
  • Jason Dwyer
  • Paul McPhee
  • Maxime Rattier
  • Eloise Larsen
  • Shihu Hu

Detail(s)

Original languageEnglish
Article number119034
Journal / PublicationWater Research
Volume223
Online published28 Aug 2022
Publication statusPublished - 1 Sept 2022
Externally publishedYes

Abstract

As a promising energy- and carbon efficient process for nitrogen removal from wastewater, mainstream nitrite shunt has been extensively researched. However, beyond the laboratory it is challenging to maintain stable performance by suppressing nitrite-oxidising bacteria (NOB). In this study, a pilot-scale reactor system receiving real sewage was operated in two stages for >850 days to evaluate two novel NOB suppression strategies for achieving nitrite shunt: i) sidestream sludge treatment based on alternating free nitrous acid (FNA) and free ammonia (FA) and ii) sidestream FNA/FA sludge treatment integrated with in-situ NOB suppression via step-feed. The results showed that, with sidestream sludge treatment alone, NOB developed resistance relatively quickly to the treatment, leading to unstable nitrite shunt. In contrast, robust nitrite shunt was achieved and stably maintained for more than a year when sidestream sludge treatment was integrated with a step-feed strategy. Kinetic analyses suggested that sludge treatment and step-feed worked in synergy, leading to stable NOB suppression. The integrated strategy demonstrated in this study removes a key barrier to the implementation of stable mainstream nitrite shunt. © 2022 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Free nitrous acid, Nitrite shunt, NOB suppression, Sludge treatment, Step-feed

Citation Format(s)

Achieving robust mainstream nitrite shunt at pilot-scale with integrated sidestream sludge treatment and step-feed. / Duan, Haoran; Watts, Shane; Zheng, Min et al.
In: Water Research, Vol. 223, 119034, 01.09.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review