Nitrite production from urine for sulfide control in sewers

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

30 Scopus Citations
View graph of relations

Author(s)

  • Min Zheng
  • Zhiqiang Zuo
  • Yizhen Zhang
  • Yujia Cui
  • Qian Dong
  • Yanchen Liu
  • Xia Huang

Detail(s)

Original languageEnglish
Pages (from-to)447-454
Journal / PublicationWater Research
Volume122
Publication statusPublished - 2017
Externally publishedYes

Abstract

Most commonly used methods for sewer sulfide control involves dosing chemical agents to wastewater, which incurs high operational costs. Here, we propose and demonstrate a cost-effective and environmentally attractive approach to sewer sulfide control through urine separation and its subsequent conversion to nitrite prior to intermittent dosage to sewers. Urine collected from a male toilet urinal was fed to laboratory-scale sequencing batch reactors. The reactors stably converted roughly 50% of the nitrogen in urine to nitrite, with high abundance (at 17.46%) of known ammonia-oxidizing bacteria (AOB) of the genus Nitrosomonas, and absence (below detection level) of typical nitrite-oxidizing bacteria of the genus Nitrospira, according to 454 pyrosequencing analysis. The stable nitrite production was achieved at both relatively high (1.0–2.0 mg/L) and low (0.2–0.3 mg/L) dissolved oxygen concentrations. Dosing tests in laboratory-scale sewer systems confirmed the sulfide control effectiveness of free nitrous acid generated from urine. Life cycle assessment indicated that, compared with commodity chemicals, nitrite/free nitrous acid (FNA) production from urine for sulfide control in sewers would lower the operational costs by approximately 2/3 and greenhouse gas (GHG) emissions by 1/3 in 20 years. © 2017 Elsevier Ltd

Research Area(s)

  • Economic analysis, Free nitrous acid (FNA), Life cycle assessment, Sulfide control, Urine separation

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Nitrite production from urine for sulfide control in sewers. / Zheng, Min; Zuo, Zhiqiang; Zhang, Yizhen et al.
In: Water Research, Vol. 122, 2017, p. 447-454.

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