Wastewater Primary Treatment Using Forward Osmosis Introduces Inhibition to Achieve Stable Mainstream Partial Nitrification

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

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Author(s)

  • Yingfen Zhao
  • Nur Hafizah Ab Hamid
  • Nichelle Reddy
  • Min Zheng
  • Haoran Duan
  • Liu Ye

Detail(s)

Original languageEnglish
Pages (from-to)8663-8672
Journal / PublicationEnvironmental Science and Technology
Volume56
Issue number12
Online published26 May 2022
Publication statusPublished - 21 Jun 2022
Externally publishedYes

Abstract

Achieving stable long-term mainstream nitrite oxidizing bacteria (NOB) suppression is the bottleneck for the novel partial nitrification (PN) process toward energy- and carbon-efficient wastewater treatment. However, long-term PN stability remains a challenge due to NOB adaptation. This study proposed and demonstrated a novel strategy for achieving NOB suppression by the primary treatment of mainstream wastewater with a forward osmosis (FO) membrane process, which facilitated two external NOB inhibition factors (salinity and free nitrous acid, FNA). To evaluate the proposed strategy, a lab-scale sequencing batch reactor was operated for 200 days. A stable PN operation was achieved with a nitrite accumulation ratio of 97.7 ± 2.8%. NOB were suppressed under the combined inhibition effect of NaCl (7.9 ± 0.2 g/L, as introduced by the FO direct filtration) and FNA (0.11 ± 0.02 mg of HNO2-N/L, formed as a result of the increased NH4+-N concentration after the FO process). The two inhibition factors worked in synergy to achieve a more stable PN operation. The microbial analysis showed that the elevated salinity and accumulation of FNA reshaped the microbial community and selectively eliminated NOB. Finally, an economic and feasibility analysis was conducted, which suggests that the integration of an FO unit into PN/A is a feasible and economically viable wastewater treatment process. © 2022 American Chemical Society. All rights reserved.

Research Area(s)

  • forward osmosis, free nitrous acid, mainstream partial nitrification, salinity, wastewater primary treatment

Citation Format(s)

Wastewater Primary Treatment Using Forward Osmosis Introduces Inhibition to Achieve Stable Mainstream Partial Nitrification. / Zhao, Yingfen; Ab Hamid, Nur Hafizah; Reddy, Nichelle et al.
In: Environmental Science and Technology, Vol. 56, No. 12, 21.06.2022, p. 8663-8672.

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